Vacuum Casting Service

  • Minimum scrap loss, low labor cost to save budget

  • A wide range of plastic materials can be selected

  • Molds are durable for 20 or more copies and can be made in a few days

  • Cast copies are highly accurate with excellent surface texture

  • Many types of polyurethane resins are available for casting, including overmolding

  • Perfect for engineering models, samples, rapid prototypes, bridge to production

    Silicone Injection Molding Company

    • We can cast parts as large and small, everything from headphones all the way up to 2m long car bumpers

    • Massive range of materials available for your projects

    • Delivery your high-quality vacuum casting services in 7- 14 days

    • Only use the highest quality resins from the best international brands.

    Vacuum Casting  Factory Tour

    Usually we will use CNC machining or 3D printing to make an original mold. If we accept 3D printing, we can complete the model in one day. Then, we will spend another day checking the tolerances and assembly details. Once approved, the Holly team will spend another 3-4 days to make the silicone mold. Another 2-3 days are used for vacuum casting processing. Holly needs a week or so to complete the entire vacuum casting project.

    vacuum casting process

    Make Silicone Mold

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    Silicone Mold Process

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     Inject liquid Epoxy Resin & heat to Cure

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    Casting Mold Making

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    Vacuum Casting Assembly

    Vacuum casting equipment

    Vacuum Casting Machine

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    Post-Machining For Vacuum Casting

    Vacuum casting package

    Vacuum Casting Products Package

    Different types of Plastic Material Avaialble

    ABS is formed by copolymers of acrylonitrile A, butadiene B and styrene s, and each monomer has different characteristics. ABS is an amorphous material. This determines its low temperature resistance, impact resistance, appearance performance, low creep, good dimensional stability, and easy-to-process ABS material. High surface hardness and good chemical resistance. At the same time, by changing the ratio of the above three components, various properties of ABS can be changed, so ABS engineering plastics have a wide range of applications. Synthetic ABS can be divided into four types: medium impact type, high impact type, super high impact type and heat resistant type.

    ABS plastic has high moisture absorption and humidity sensitivity, so it must be dried at 90°C for at least 2 hours before molding. The humidity is controlled below 0.03%.

    The suitable processing temperature of molten glue is 190-235℃. The melt viscosity of ABS is medium and needs to be produced under high injection pressure (500~1000bar). High-speed injection molding production effect is better in ABS plastic. The nozzle position of this product is prone to airflow.

    The molding temperature of ABS plastic is relatively high, and the mold temperature should be adjusted at 30-70°C. In the production of large-size parts, the half temperature of the fixed mold is about 5°C higher than the half temperature of the movable mold. Mold temperature affects the appearance quality of the product, the lower the temperature, the lower the appearance quality of the product.

    Polypropylene is a polymer formed by the polymerization of propylene. The composition and structure of polypropylene is crystalline polymer. Among the commonly used plastics, PP is the lightest material, with a density of only 0.90-0.91g/cm³ (less than water). Heat resistance is the best feature of PP among general-purpose plastics. The deformation temperature of PP is 80-110℃, and the product can be processed in boiling water at 100℃. PP has excellent stress crack resistance and good warpage fatigue life.

    PP products have the advantages of lightweight, good toughness, and good chemical corrosion resistance. The disadvantages of PP are low dimensional accuracy, insufficient rigidity, poor weather resistance, ease to be damaged by “copper”, ease to shrink, ease to age, brittle, and warp after demolding.

    Injection mold process conditions: Drying: If stored properly, it does not need to be dried.

    Melting temperature: 220-250℃, not more than 250℃.

    Mold temperature: 20-50℃, 40℃ is recommended.

    A mold’s temperature is responsible for determining how much crystallization occurs.

    Injection pressure: up to 1800bar.

    Injection speed: Under normal circumstances, the use of high-speed injection molding can reduce the internal pressure to a minimum.

    Polyethylene (PE) is a thermoplastic resin polymerized by ethylene. Polyethylene is colorless and non-toxic. And it feels like wax, has low temperature resistance (the lowest temperature can reach 70°C), good chemical resistance, and can withstand most acids and alkalis (not oxidation resistant). Insoluble in general solvents at room temperature, it has excellent electrical insulation and low water absorption.

    Polyethylene is a polymer with a variety of structures and properties. It is mainly divided into LDPE, MDPE, HDPE, LLDPE, and performance ultra-high molecular polyethylene and low molecular polyethylene.

    Injection conditions:

    The temperature settings are as follows: injection nozzle 140-190°C, front part 140-200°C, middle part 130-180°C, screw speed 210-220 rpm, mold temperature 10-70°C, material tube temperature 150-210°C, back pressure 5 ~ 10 kg, injection pressure 360-500 kg / c㎡.

    Polystyrene plastic (PS) refers to plastics containing styrene groups on the polymer chain, including ordinary polystyrene (GPPS), high-impact polystyrene (HIPS), expandable polystyrene (EPS) and metallocene Polystyrene (SPS) and so on.

    General-purpose polystyrene is a thermoplastic resin, which is a shiny transparent bead or granular solid. The density is 1.04-1.09, the transparency is 88%-92%, and the refractive index is 1.59-1.60. The product has a melting temperature of 150-180°C, a thermal decomposition temperature of 300°C, a heat distortion temperature of 70-100°C, and a long-term use temperature of 60-80°C.

    It is soluble in aromatic hydrocarbons, chlorinated hydrocarbons, aliphatic ketones and esters. In addition, it can withstand the influence of certain mineral oils, organic acids, alkalis, salts, low alcohols and their aqueous solutions. The water absorption rate is low, and the mechanical properties and dimensional stability can be maintained in a humid environment. Its optical performance is second only to acrylic resin. Excellent electrical performance, high volume resistivity and surface resistivity, not affected by temperature and humidity changes, and not affected by corona discharge.

    Its main disadvantages are brittleness and easy cracking, low impact strength, poor heat resistance, cannot withstand boiling water, and can only be used at lower temperatures and lower loads. The lightfastness and flammability are poor.

    It is possible to use the material directly without drying it in injection molding. But in order to improve the quality of the product, it can be pre-dried in a blast furnace at 55-70°C for 1-2 hours. The specific processing conditions are as follows: the barrel temperature is about 200℃, the mold temperature is 60℃80℃, the injection temperature is 170℃-220℃, and the compression ratio is 1.6 ~ 4.0. In order to eliminate internal stress, the molded product can be treated in an infrared lamp or a blast furnace at 70°C for 2 hours.

    PC material is a widely used engineering plastic and belongs to amorphous plastic. It has good mechanical properties, such as high impact resistance, high tensile strength, excellent bending strength, low shrinkage, low thermal creep, high dimensional accuracy, good heat resistance, low-temperature resistance, etc. It can be used at temperatures of minus 60 to 120 degrees Celsius. The disadvantages are poor fatigue strength, brittleness, low solvent resistance and poor wear resistance.

    PC material has excellent characteristics such as high light transmittance, high refractive index, high impact resistance and dimensional stability. Optical lenses made of optical grade polycarbonate can be used in cameras, microscopes, telescopes, optical testing instruments, etc., and can also be used in film projector lenses, copier lenses, infrared autofocus projector lenses, laser beam printer lenses, etc. As well as various prisms, polygon mirrors and many other office equipment and household appliances, its application market is very wide.

    The fluidity of the plastic is poor, the mold gating system should be short and thick, a cold feed well is required, the gate size should be large, and the mold temperature should be high. If the temperature of the material is too low, it will cause short shots of the parts, the plastic parts are not shiny, the material temperature is too high, it is easy to overflow, and the plastic parts will bubble. Low mold temperatures result in low shrinkage and elongation, low impact strength, low bending strength, compression strength, and tensile strength. When the mold temperature exceeds 120 degrees Celsius, the plastic parts cool slowly, and the inner wall of the easily deformable viscous mold parts should not be too thick and uniform to avoid sharp corners and chipped materials.

    The drying temperature of PC material is 120 degrees Celsius, and the drying time should be more than 4 hours. The mold temperature is usually 80 ~ 120 degrees Celsius. The injection temperature is 280 ~ 320 degrees Celsius. A slower injection speed and a larger injection molding pressure should be used in production.

    Polyamide is commonly known as nylon, and its main varieties are PA6, PA66, followed by PA11, PA12, PA610, PA612, PA46 and so on.

    Nylon has excellent mechanical strength, heat resistance, low friction ratio, self-lubricating, shock absorption and noise reduction, oil resistance, weak acid resistance, alkali resistance, general solvent resistance, good electrical insulation, self-extinguishing, non-toxic, odourless, good weather resistance, Poor dyeing and other advantages. It has high water absorption, which affects dimensional stability and electrical properties, but the combination of nylon and glass fiber is very good. Fiber reinforcement can reduce the water absorption rate of the resin, allowing it to work in a high temperature and high humidity environment.

    Nylon is a crystalline plastic material with high melt temperature, narrow melt temperature range and poor heat resistance. PA does not gradually soften with the increase of heating temperature but softens in a narrow temperature range close to the melting point. Flow occurs as soon as the temperature is reached. PA is easier to absorb moisture. In the molding process of wet nylon, the viscosity drops sharply and the mechanical strength of the silver steel wire mixed with the foam product surface is reduced, so the material must be dried before it can be dried at 80-110 ℃ for 6 hours. However, please note that PA plastics are easy to cause discolouration if they are dried above 90°C.

    PA has good fluidity and is easy to overflow, suitable for self-locking nozzles and heating. At the same time, due to the fast condensing speed of the solution, the material should be prevented from clogging the nozzles, runners, and gates and causing product shortages. The mold overflow value is 0.03, and the melt viscosity is more sensitive to changes in temperature and shear force, but more sensitive to temperature. In order to reduce the viscosity of the melt, we should start with the temperature of the barrel. It has a wide range of forming shrinkage, with prominent directions, and it is prone to shrinkage and deformation.

    It is a blend of polycarbonate and ABS. As a result, ABS can be made more heat resistant, impact-resistant, and have stronger tensile strength; on the other hand, polycarbonate can be made cheaper, with lower melt viscosity, improved processing, and with less sensitivity to internal stress and impact strength. There is now flame retardant, glass fiber reinforced, electroplated, and ultraviolet resistant polycarbonate/ABS alloys available. Mainly used in the automotive industry, computers, copiers, electronic and electrical components, etc. PC/ABS alloy materials have been widely used in automotive decorative parts, lampshades, high-temperature electrical enclosures and other fields.

    PC/ABS must be dried before processing. The humidity should be less than 0.04%. The recommended drying condition is 90mm 110℃, drying for 2h; the melting temperature should be around 23m ~ 300℃; the mold temperature should be 100℃ within 50 meters; the injection pressure depends on the plastic parts, and the injection speed has no special requirements. , But the higher the more appropriate.

    Chemical and physical properties: ABS+PC has the comprehensive characteristics of PC and ABS, such as ABS is easy to process, and PC has excellent mechanical properties and thermal stability. The ratio of the two will affect the thermal stability of the ABS+PC material. The ABS+PC hybrid material also shows excellent flow characteristics. The shrinkage is about 0.5%. ABS+PC is a mixed synthetic modified engineering plastic. Among them, PC is polycarbonate, and ABS is a copolymer of acrylonitrile (A), butadiene (B) and phenylephrine (S). This modified plastic has better performance than simple PC and ABS. Such as improved impact resistance, heat resistance, hardness and so on.

    PMMA acrylic plastic properties:

    PMMA acrylic plastic is a hard and transparent material with a density of 1.19-1.22g/10cm³. The biggest feature of PMMA acrylic plastic is its high transparency and 92% light transmittance, which is the highest among plastics. The ultraviolet light transmittance is also as high as 75%.

    PMMA acrylic plastic has good comprehensive mechanical properties. Its tensile strength, compressive strength, and flexural strength are higher than PE, PVC, PS, but its impact toughness is poor, so it is a hard and brittle material. PMMA has low heat resistance, glass transition temperature of 104℃, melting temperature of 160-200℃, thermal decomposition temperature of 270℃, easy to burn, the flame is blue when burning, the top is white, and it has a strong floral and fruity smell. And the smell of rotten vegetables.

    PMMA has good dielectric and insulation properties, excellent arc resistance, and atmospheric aging resistance; PMMA has good chemical stability, can resist dilution of inorganic acids, intermediates, salts, and oils, but is not resistant to concentrated inorganic salts , Hot alkalis, ketones, chlorinated hydrocarbons, aromatic hydrocarbons, etc., will expand and break in alcohols, and have good corrosion resistance to ozone and sulfur dioxide gas.

    PMMA acrylic plastic use: widely used in the manufacture of various optical glasses, such as lenses, prisms, mirrors, camera lenses, etc. And can make lamps, lighting equipment, instrument dials, dials, etc. In addition, it can also manufacture aircraft cabin glass, bulletproof glass, optical fiber, etc. In addition, adding fluorescent powder or pearl powder can make beautiful and beautiful products, which can be widely used in advertising decoration and handicraft production.

    Polyvinyl chloride (polyvinyl chloride) is one of the most widely used plastics. Various additives are usually added to improve the performance of PVC materials, such as stabilizers, lubricants, processing aids, pigments, enhancers, etc.

    PVC resin softens at a temperature close to that of its decomposition. It starts to decompose at 140°C, but decomposes faster at 170°C. In order to ensure the normal processing of PVC resin, the two most important process indicators are called decomposition temperature and thermal stability. The so-called decomposition temperature refers to the temperature at which a large amount of hydrogen chloride is released, and the so-called thermal stability refers to the time during which a large amount of hydrogen chloride is not released at a certain temperature (usually 190°C). PVC plastic will decompose for a long time at 100°C unless an alkaline stabilizer is added. If the temperature exceeds 180°C, it will quickly decompose.

    PVC has the advantages of flame retardancy, high chemical resistance (resistant to concentrated hydrochloric acid, 90% sulfuric acid, 60% nitric acid, 20% sodium hydroxide), good mechanical strength, and electrical insulation.

    The most common uses of PVC plastic materials include PVC profiles, PVC pipe, PVC hard materials and plates, PVC general soft goods, PVC packaging materials, PVC wallboards and floors, PVC consumer goods, PVC transparent sheets, etc. PVC plastic materials, PVC plastic materials , PVC plastic materials: PVC profiles, PVC pipes, PVC hard materials and plates, PVC general soft products, PVC packaging materials, PVC wallboards and floors, PVC consumer goods, PVC transparent sheets, etc.

    Process conditions of the injection mold. Drying temperature: 80℃ within 2h, material tube temperature: 160-190℃, mold temperature: 30-60℃, molding shrinkage rate: 0.1-0.5%. The injection pressure can reach 1500bar, and the holding pressure can reach 1000bar. In order to avoid material degradation, an appropriate injection speed is required.

    The main properties of POM are its hardness, high steel content, and wear resistance. POM has a low coefficient of friction and good geometric stability, so it is particularly suitable for manufacturing gears and bearings. The properties of POM make it appropriate for use in pipeline equipment (pipe valves, pump housings), lawn equipment, etc.

    POM is a tough and elastic material with good creep properties, geometric stability and low-temperature impact resistance. Due to the high crystallinity of POM, the shrinkage rate is high, up to 2% ~ 3.5%. Different reinforcement materials have different shrinkage.

    POM has a high heat distortion temperature, the heat distortion temperature of homopolymerization is 136℃, and the heat distortion temperature of copolymerization is 110℃. However, due to the difference in molecular structure, co-formaldehyde has a higher continuous use temperature. Generally speaking, the long-term use temperature of polyoxymethylene is about 100℃. UL specifies the long-term heat-resistant temperature of POM as 85-105°C. Mechanical properties: Since POM is a highly crystalline polymer, it has high elastic modulus, high hardness and rigidity. It can be used for a long time under the condition of -40 ~ 100℃. And it can withstand repeated shocks with little change in strength. Temperature and temperature changes do not greatly affect strength.

    Injection molding conditions: POM does not need to be dried before injection molding. The melting temperature range is 190-220°C. By increasing the holding pressure during injection molding, the pressure drop can be reduced. The material will decompose at a high melting temperature. The screw speed should be appropriate, not too high, and the residue should be reduced; the appropriate mold temperature is (80mm 100℃), and the product demoulding temperature is relatively high, so pay attention to the protection work when disassembling the parts. POM should be processed under the conditions of medium injection pressure, medium injection speed, low material temperature and high mold temperature.

    PEEK plastic is a special engineering plastic, which is a high molecular polymer composed of aryl, ketone bond and ether bond. It has many properties such as high temperature resistance, strong flame retardancy, and good chemical stability, so it is often used in construction machinery and aerospace products.

    PEEK plastic has the advantages of strong heat resistance and high temperature resistance. The positive high temperature resistance of PEEK plastic is 260°C, and the heat distortion temperature is 160°C. If 30% glass fiber is added for modification, the heat distortion temperature can be increased to 280-300℃.

    PEEK plastic has excellent electrochemical properties. Even in the high frequency range, the dielectric index and dielectric loss of 10HZ plastic are very small. The results show that the dielectric point constant under the PVA environment is only 3.2, and the dielectric loss is only 0.02.

    It has excellent chemical stability and can withstand acids and alkalis. Almost any chemical reagent except concentrated sulfuric acid still maintains good stability at high temperatures.

    It has excellent hydrolysis resistance and can be used for a long time even in a steam environment at 200-250°C.

    In addition, PEEK plastic also has excellent flame retardancy, melt fluidity, thermal stability, corrosion, high strength and easy formability.

    PEEK plastic is widely used in chemical industry, electronic equipment, automobile industry, aerospace and other fields because of its excellent high temperature resistance, heat resistance, high height and processability.

    This material is formally known as polyphenylene sulfide. It is famous for its thermal stability and is widely used in special engineering plastics after filling and modification.

    PPS is a special high engineering plastic with excellent properties such as high temperature resistance, flame retardant, corrosion resistance, weather resistance, dimensional stability, and excellent electrical properties. The transformed PPS is widely used as special engineering plastics, mainly in the fields of electronics and electrical appliances, such as transformer skeletons, high-frequency coil skeletons, plugs, sockets, junction frames, contactor drum plates, and various precision parts.

    Heat resistance is PPS plastic: the heat distortion temperature exceeds 260℃, which is one of the highest temperatures of thermoplastic engineering plastics. The long-term use temperature is 220-240℃, and the short-term temperature can reach 260℃.

    Chemical resistance of PPS plastics: At present, we cannot find any solvent that can dissolve PPS below 200°C, and has high corrosion resistance to inorganic acids, alkalis, and salts.

    When exposed to high temperatures, high humidity, and high frequency, PPS plastic exhibits high surface resistivity, low breakdown voltage, low dielectric constant, and dielectric loss tangent, making it an excellent insulation material. After modification, it can also be made into a high-strength material with good electrical conductivity.

    PPS plastic mechanical properties: strong rigidity, high surface hardness, excellent creep resistance and good fatigue resistance.

    Injection conditions: The material is dried at 130-150°C for 3 hours, the barrel temperature is 280-330°C, 40%GF+PPS 300mm, 350°C, the mold temperature is 120-180°C, the injection pressure is 50-130V MPA, and the injection speed is medium.

    Finishing Methods

    Polishing is the process of grinding and modifying the surface of parts using various tools and media. The function of polishing is to make the surface of the part smoother, but it cannot improve the geometric shape and dimensional accuracy of the part. Technically speaking, polishing refers to the use of abrasives and machinery to make the surface of parts smooth, while using machinery to apply abrasives to the surface of loose parts is a more active process, which will make the surface finish smoother and brighter.

    Polishing on mechanical parts is generally divided into three steps:

    The first step: After the processes of knife scar, grinding, CNC, spark machine, wire cutting, etc., the surface is generally rough, so we need to polish the surface of the part with oilstone.

    Step 2: After the oilstone operation, the sandpaper operation is performed. When the sandpaper operation, pay attention to the round edges, sharp corners, rounded corners, and orange peel of the parts.

    The third step: We mainly use diamond grinding paste, and the accuracy requires Ra0.2, which requires a clean polishing room.

    The processed surface is the surface effect of the workpiece obtained by directly processing the workpiece with various machines and equipment without any post-processing. With the improvement of modern machinery accuracy, the surface quality of the workpiece is getting better and better. Although the processing line can be seen on the surface of the workpiece, it is actually very smooth, and the general processing surface quality can reach Ra3.2.

    Anodizing is divided into ordinary anodizing and hard anodizing.

    The conversion film formed in the process of metal anodization is wear-resistant, corrosion-resistant, and other functional or decorative properties on the metal surface in the electrolytic solution electrochemical treatment, and the treated part is used as the positive and negative corrosion-resistant materials.

    The object of anodizing treatment can be aluminum and aluminum alloy, magnesium alloy, titanium and titanium alloy, etc. The anodic oxidation of aluminum and aluminum alloys is widely used in the market and is developing rapidly.

    The main function of anodizing is to improve the hardness, wear resistance, corrosion resistance and surface coloring of the workpiece, and to protect and beautify the surface of the workpiece.

    Sandblasting is a kind of high-pressure air as the power to spray abrasives into the workpiece that needs surface treatment at a high speed, thereby changing the post-treatment process of the surface of the workpiece. Due to the impact and cutting action of the abrasive on the surface of the workpiece, the working surface will get different roughness, which improves the mechanical properties of the working surface and improves the fatigue durability of the workpiece. Due to the influence of abrasives, very small pores are generated on the working surface, thereby increasing the adhesion between the workpiece and the coating and prolonging the service life of the coating.

    The main functions of sandblasting are as follows:

    In order to remove oil and rust, sandblasting can remove rust and other dirt on the surface of the workpiece, forming a certain rough surface on the surface of the workpiece, thereby improving the adhesion of the plastic powder and the paint film.

    For processed workpieces, burrs on the surface can be removed by sandblasting to make the workpiece more beautiful.

    For castings or heat-treated parts, sandblasting can remove oil and scale on the surface, improve the surface finish, and make the workpiece more beautiful.

    Powder coating electrostatic spraying is to use static electricity to adsorb the powder coating on the working surface, and the powder is baked at high temperature to form a solid coating on the surface of the part.

    Electrostatic powder spraying must first have an electrostatic generator to generate DC high voltage, a spray gun, a power supply system, and a powder recovery system to spray and atomize the powder. The workpiece to be sprayed should be grounded to the positive electrode, and the negative high voltage generated by the discharge needle gun connected to the powder outlet of the spray gun will generate corona discharge through the discharge needle. At this time, the negatively charged powder particles reach the surface of the workpiece under the action of static electricity and compressed air flow.

    Due to the attraction of electrostatic force, the powder is uniformly adsorbed on the surface of the workpiece for a period of time without falling off. The workpiece enters the curing furnace, leveled, consolidated, and controlled humidity or time, and finally a tight, uniform, smooth and dense coating is combined with a firm workpiece. .

    Powder spraying makes the surface of the product smooth, and the coating has strong acid resistance, alkali resistance, impact resistance and abrasion resistance. And can withstand strong ultraviolet radiation and acid rain for a long time, and the coating has no powdering, discoloration, falling off and other phenomena.

    Black oxidation is an oxidation treatment on the surface of steel, mainly suitable for carbon steel and low alloy steel.

    The black oxide heats the workpiece in a solution of concentrated alkali and oxidant (heating temperature is about 550°C), forming a dense oxide film (fe3-fe3) on the surface of the steel. The iron oxide film can isolate the air, prevent the internal steel from oxidizing, and achieve the purpose of corrosion resistance.

    The steel is oxidized to form a protective oxide film with magnetic iron oxide (fe-fe2o3) as the main component. Its color is generally black or blue-black, and cast steel and silicon steel are brown. The oxidation treatment methods include alkali oxidation, alkali oxidation, acid oxidation and so on. It is often used for the protection and decoration of machinery, precision instruments, weapons and daily necessities.

    Whether iron oxide can be oxidized with dense and smooth iron oxide, it is very important to choose a strong oxidizer. The strong oxidant is composed of sodium hydroxide, sodium nitrite and sodium hydroxide phosphate. When the color is blue, the steel part is treated with its molten liquid; when the steel part is treated with an aqueous solution, the steel part is black.

    Surface drawing is a surface treatment method that forms lines on the surface of the workpiece by polishing the product and has a decorative effect.

    The surface drawing process is to use drawing materials to make a decorative surface of metal stainless steel aluminum surface, and the surface drawing process is also a surface treatment method. It can make the surface clearly show every tiny silk mark, so as to make the metal frosted surface a fine brushed gloss product. Because wire drawing surface treatment can make the surface of the material show different textures and make the product more beautiful, wire drawing processing is becoming more and more popular nowadays.

    There is no uniform classification and name for wire drawing. Usually divided into straight wire and wire according to the surface effect. Straight wire is also called silk thread; while silk thread is called snow pattern.

    Electroplating is the use of electrolyte to electroplate other types of metals on the workpiece. Use electrolysis to attach the surface of the part to the metal film to prevent metal oxidation (corrosion), improve wear resistance, electrical conductivity, anti-reflection, corrosion resistance (such as copper sulfate), and improve aesthetics.

    Electroplating metal or other insoluble materials, anodizing the workpiece, and cathode coating metal cations, form a coating surface on the surface of the workpiece. In order to eliminate the interference of other cations and make the electroplating uniform and firm, the electroplating solution should be used as the electroplating solution containing electroplating metal cations to keep the concentration of metal cations unchanged.

    Vacuum Casting Services FAQ

    Vacuum casting is a more economical alternative, especially in small batches. It also provides unique advantages such as an excellent surface finish.

    Vacuum casting is the best way to make visually impressive prototypes, but it can also be used for non-mechanical end-use parts such as chassis and covers.

    Silicone molds used in vacuum casting have a short life span, generally around 20, so we dispose of them after use.

    • Gray cast iron, nodular cast iron
    • Carbon steel: low carbon, medium carbon, high carbon steel
    • Cast steel alloy: low alloy steel, high alloy steel, special alloy steel
    • Aluminum and its alloys
    • Brass and copper.

    As the advantages of vacuum casting mentioned above, vacuum casting can be applied in a wide range of industries. Especially suitable for large and medium-sized castings, vacuum casting can be used for both single-piece and batch production, whereas thin-walled castings are better suited for vacuum casting. Therefore, vacuum castings are mainly used in agricultural machinery, hydraulic systems, rail trucks, cranes and shipbuilding industries.

    During vacuum casting, since the surface of the model is covered with plastic film, there is no need to vibrate or beat when drawing the die. Suction and negative pressure make the sand compact, and the sand mould has high hardness and uniformity. Under the heating of molten metal, the cavity is not easily deformed. The existence of negative pressure is conducive to filling the model with molten metal. V process castings have a surface roughness of Ra = 25*2.5*m. The dimensional tolerance of castings can reach CT5 ~ CT7. The negative pressure casting has good appearance and reliable internal quality.

    Our preference is the 3D CAD files, such as STP, STEP, X-T, IGS.

    Send us CAD files (such as STEP format), and tell us the quantity, material, surface finish, color, or other requirements you need, then we will check and evaluate, and give you a suggestion for the part design and quote you.

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    Contact us for design assistance, free quote, and expert advice today.
    Your inquiry will be replied within 12 working hours, and we respect your privacy.

    Vacuum Casting Service -Definitive Guide

    If you want to know what is the most economical way to make a prototype? Then you should try vacuum casting. In vacuum casting, you need to have the right and optimal temperature to cure the material. For resin, when the vacuum pressure time is 5 minutes and the mold temperature is 60 degrees Celsius, you need 30 degrees Celsius to minimize shrinkage.

    Vacuum casting is the same replication using silicon molds. The use of silicone molds for plastic vacuum casting was developed in a German university in the 1960s. What are the benefits of vacuum casting for your company? Continue reading this article to find out.

    1. What is Vacuum Casting?

    Vacuum casting is an elastomer casting process that uses a vacuum to suck any liquid material into the mold. When vacuum casting is used, air trapping is a problem with the mold. In addition, this process can be used when there are complex details and cuts on the mold. In addition, if the material used to make the mold is fibre or reinforced steel wire, it is also applicable.

    Sometimes, vacuum casting is also called thermoforming, because the process of manufacturing involves rapid prototyping, and the plastic sheet is preheated. These materials are preheated in an automatic vacuum casting machine until they become soft and flexible.

    2. Why Choosing Vacuum Casting?

    The result of the vacuum casting process is a high-quality product compared to injection molded components. Vacuum casting models are often used for functional testing and marketing purposes. The final product has such a good ending, this technology has attracted a large number of viewers. The finishing method of vacuum casting is unmatched by any other process.

    1) The product has high precision and fine details

    When you use silicone as a mold and moldy to your product. It ensures that the final product has a great interest in details. The final product looks just like the original product.

    Every interest in information is considered and also considered. Even if the original product has the most complex geometry, the final product looks like the original product.

    2) High-quality products

    The products produced by the vacuum casting process are of high quality. In addition, the use of resin allows you to choose the ideal product for the final product produced.

    This enables you to have more flexibility, hardness, and hardness options in your project. Also, considering that the product used plays an important role, this has an excellent effect on the final appearance of the product.

    3) Lower Production Costs

    It is more cost-effective to use the vacuum casting process to make products. This is because this process uses silicon to make molds and mold. Compared with aluminium or steel, silicone resin has a lower cost and can produce excellent end products.

    In addition, this material allows you to make more products from mold and mildew. This makes the process more budget-friendly compared to using 3D printing.

    4) Fast Delivery

    This method is fast, and it takes less time to complete the completed project. You may need 7 to 10 days to make about 50 operable model parts. This technique is amazing when you make a large number of items. In addition, if you can complete the task before the deadline, that would be great.

    Why Choosing Vacuum Casting

    3. How Does Vacuum Casting Work?

    Casting of polyurethane must be carried out under vacuum to guarantee the excellent characteristics of mechanical strength and surface finish typical of this technology.

    Typically, the master is obtained by 3D printing, possibly using a technique that provides a good surface finish, such as stereolithography, and depending on the properties of the piece to be obtained (mechanical strength, transparency, colour, elasticity, weight, conductivity, flame retardancy, etc.) choose cast polyurethane.

    Alternatively, the master can also be achieved by other techniques (CNC, hand modelling), it can also be made from a commercially available detail, an old product or a piece of art. Even casting materials can be of different types: Epoxies, waxes, ceramics and composites can replace polyurethane.

    Vacuum casting can be used to assemble different materials, for example, to incorporate bushings, pins, different types of inserts, electronic boards, and also to overmolding two different plastic materials or one plastic and one elastomer. In contrast, compared to mass-production solutions such as injection molding:

    • This is convenient if there are very few things to do;
    • It allows to manage some back cuts without using inserts;
    • Within certain limits, the presence of variable thickness can be accepted without significant deformation of the workpiece.

    4. Vacuum Casting Process

    The vacuum casting process follows different process stages to manufacture raw materials and complete finished products. Everything takes place in a casting vacuum chamber. Let’s see the step-by-step process of how vacuum casting works:

    1) Have a high-quality master model

    The vacuum casting process requires you to have a high-quality master mold. The high-quality master model can be the industrial component itself. In addition, you can use a model created using stereolithography, which is an example of application prototyping.

    You should always make sure that the master model used has the correct size and appearance. This is to ensure that no defects are transferred to the model prototype after the completion of the process.

    2) Cure Process

    Then, the master model is encapsulated in a two-part silicone rubber mold. The mold is cured at a high temperature to ensure that the two parts stick together. In this way, the mold can be stronger and more durable.

    After the mold is cured, it is cut open to expose a hollow space in the centre, which is consistent with the precise dimensions of the main model. After the mold is cut into two sections, it is placed in a vacuum chamber. Then, fill the specified material in the mold to make the product.

    3) Filling The Resin

    You should fill the mold with the specified material. This resin has the characteristics of industrial material. Resin materials are usually mixed with metal powders or any coloured pigments to achieve aesthetics or specific functional properties.

    After filling the mold with resin material, it is placed in a vacuum chamber. Place in a vacuum chamber to ensure that there are no bubbles in the mold. This is to ensure that the final product is not destroyed or damaged.

    4) Final Cure Process

    The resin is put into the oven for the final curing stage. The mold is cured at a high temperature to ensure that the material is strong and durable. The silicone mold is removed from the mold so that it can be used to make more prototypes.

    After the prototype is taken out of the mold, it is painted and decorated. Painting and design are used to ensure that the product has a gorgeous final appearance.

    Vacuum Casting Process

    5. Benefits of vacuum casting

    Vacuum casting is more economical than 3D printing or injection molding. This allows you to produce more items at a lower cost. Visit this website and learn more about vacuum casting and the use of silicone molds and mold using this extraordinary modern technology.

    1) Better than injection molding

    Because injection molding is more commonly used than vacuum casting, many organizations may not even consider the vacuum casting process of their parts. However, in some specific cases, silicone-based surgery is more worthwhile and may be of higher quality.

    2) Quantity

    For a large number of components, it is difficult to see injection molding. Although the set-up price of injection molding is high (even with rapid mold), the equipment cost is very low. This means that when a company needs hundreds or thousands of duplicate parts, the upfront cost of installation can be easily compensated by saving each part.

    On the other hand, not every organization needs hundreds or thousands of copies of a component. When fewer parts are required, vacuum casting may be a better choice, as installation costs are greatly reduced.

    3) Detail

    Since molds are usually made of high-quality metal, shot peening can develop more complete parts compared to vacuum casting. Therefore, for highly complex parts, shot blasting is a better choice.

    For less complex parts, especially those that only need to be manufactured in small quantities, vacuum casting can be more effective. This is not a simple and affordable alternative: vacuum casting can use extremely smooth surfaces, which means direct components may look better when vacuum casting is used.

    4) Rate and version

    Vacuum casting reduces configuration costs and has a good knock-on effect. If the design needs to be modified at any stage in the manufacturing process, changing the vacuum casting mold and mold is much easier and more affordable than redesigning the mold or reusing the mold for injection.

    Generally speaking, this means that in the early stages of development, vacuum casting is usually a better choice. In fact, organizations often use vacuum casting to make very early models before creating end-use components or late-stage prototypes using injection molding.

    Importantly, producing molds and molds for vacuum casting is much faster than creating molds for pellet casting, which means that vacuum casting is usually more suitable for very small numbers of time-sensitive prototype tasks. (The larger the batch, the faster the injection molding.)

    5) Material considerations

    Even if all indications indicate vacuum casting, we must remember that some prototypes—especially those that will undergo physical screening—need to be as close as possible to the end-use part. Therefore, if a useful part will eventually use injection molding, it may be beneficial to prototype using the same process, even if the cost is higher.

    6. Vacuum Casting Material

    We offer 26 carefully selected polyurethanes, similar to rubber, PP, ABS, and PC. These materials provide excellent various properties and the possibility of matching colours and casting transparent components. If you are looking for a specific finish, our skilled vacuum casting post-production team will meet your requirements. Contact us for more detailed information to find the best material for your project.

    7. How to Select Material For Vacuum Casting

    With the wide application of vacuum casting technology and the advantages it brings, research on it and its materials are particularly important. This article will tell you the types of materials we use in vacuum casting and what exactly these materials simulate. I hope this article will help you gain more knowledge about vacuum casting materials.

    1) Factors to consider when choosing materials

    When we will see different types of materials for our use, it is important to ensure that they meet certain characteristics or certain factors.

    In addition, due to the wide range of materials available, it may be slightly more difficult to find a perfect match for a particular characteristic. This requires research on specific materials to find out which materials are more suitable for a specific character than other materials. This wide availability also ensures that the material must be able to meet any type of demand, no matter how specific it may be.

    Vacuum casting materials are expected to have the following characteristics to a certain extent:-

    • Surface finish
    • Stiffness
    • Temperature resistance
    • colour
    • flexibility
    • strength
    • Quality appearance
    • Transparency or certain levels of translucent properties
    • UV stable

    The above factors are our basic understanding of the materials used in vacuum casting. Different materials will have different levels of these properties, and we must use them accordingly to adapt to our prototype.

    2) A general study of materials and their properties

    Now that we know that materials need to follow certain characteristics or characteristics, the next step is to find out which materials have which characteristics. In this section, we will look at the strength of materials and where these strengths can be applied.

    Vacuum casting adopts thermoplastic polyurethane material. The important thing is that the materials we use in vacuum casting must accurately show performance similar to elastomer rubber, ABS, etc. This ensures access to a wider range of properties and enables multiple opportunities to be applied and a wide variety of components to be converted.

    Vacuum casting materials expect to simulate materials and their special properties as follows:

    • High flexibility of rubber.
    • As shown by ABS, it has high hardness, strength and transparency.
    • High elastic properties of polypropylene and HDPR.
    • High rigidity of glass-filled nylon and polyamide.

    Resistance to impact and high temperature, as shown by PMMA and polycarbonate.

    Flame-retardant and flame-retardant properties of filled ABS

    We can cite some examples of materials that successfully simulate some of the properties in the above list and are very useful in vacuum casting.










    Specialist Material



    Retardance/Fire Resistance



    90A Rubber

    High Tear Strength

    Specialist Material



    UV Stable

    3) Application of vacuum casting materials

    As we have seen, the materials used for vacuum casting have a large number of properties. This ensures that they have a wide-ranging impact on the manufacturing industry. Let’s take a look at some of them.

    • The automotive industry has used the influence of vacuum casting materials to increase the mass production of automotive parts.
    • These products are used in the consumer goods industry to make decorative pieces such as display pieces and wall plaques.
    • As vacuum casting technology is used in medical equipment and has made great progress in prosthetics, the medical industry has benefited a lot from vacuum casting technology.
    • In addition to the above points, vacuum casting materials are used by engineers in multiple industries, such as telecommunications, aerospace and food production.

    8. Application of Vacuum Casting

    Vacuum casting is used in the food and beverage sector to make bottles and cans. It is also used in business projects and housing projects.

    1) Food and drink

    The food and beverage market uses this product to package its final product. Vacuum casting can be used to make plastic bottles and plastic cans. Considering that this process can be used to make props quickly and can be used on a large scale, this process is chosen in most fields.

    2) Commercial products

    This program is used to make commercial items that can be used for packaging. Most of the items used in this process include sunglasses, mobile phone cases, food and beverage packaging, and pens. This method creates employment opportunities for those who want to risk selling these products.

    4) Household products

    Some household products use vacuum casting technology. Daily necessities, such as detergents, food processing, and cosmetics are all made using this procedure. If your product comes from a high-quality company, they are likely to use the vacuum casting process to manufacture the product.

    10. How much does it cost for vacuum casting

    Obviously, it is difficult to give a cost indicator valid for each model, but in general, it can be said that the cost of a mould can vary between 200 and 1000€, although the cost per piece can vary by 10 to 100€, from getting Simple fragments to increasingly complex geometries. Considering that each mold can be printed around 20 times, the single cost including equipment is between 20 – 150 euros. These costs can be reduced if multi-mode molds can be produced or cheaper materials can be cast.

    11. When does the silicone molding make sense?

    These technical and economical features make silicone molds an ideal solution for different situations:

    Small series of products, niche products (tens to hundreds of pieces);

    Production of customized products of different sizes that are difficult to manage with injection molds;

    For the intermediate development of a project, when all the details have not been defined, but you want to start testing a small series of areas in the final product;

    A project of advanced development, when you have a product that is basically market-ready, but you are not able to generate large quantities (because of the cost and time to set up the equipment, because the market is very variable in terms of consumer demand and available components);

    Copy and copy objects without CAD models, which can be craft models, works of art, natural objects;
    Manufacture of spare parts for non-production products whose market quantities are believed to be incompatible with mass production.

    In the latter two cases, the silicone molding solution is usually a cheaper alternative, compared to the reverse engineering process that involves: scanning, data processing, CAD remodelling, which can be very expensive and not always necessary.

    9. Conclusion

    Holly offers a variety of prototyping processes, from industrial-grade CNC machining to FDM 3D printing. Small rolls of plastic parts, however, are usually used by companies in injection molding-usually using liquefied materials in the process of injecting steel mold and mold, vacuum casting, and more affordable silicone molds for the development of small-batch plastic components.

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