Custom Plastic Injection Molding – Best Plastic Molding Companies in China

Welcome to Holly – your trusted partner for precision plastic injection molding in China! With more than 20 years of manufacturing excellence, Holly delivers dependable, scalable, and technically advanced molding solutions for global clients across industries such as automotive, electronics, home appliances, medical devices, and industrial equipment.

As one of the leading plastic molding companies China, Holly offers a fully integrated service covering every stage of the production cycle—from product development and mold design to injection molding, post-processing, assembly, and quality control. Whether you need complex miniature components or large-volume functional housings, we deliver consistent performance and fast lead times.

In-House Tooling for Long-Term Precision

Our mold workshop is equipped with high-precision CNC machining centers, EDM systems, and surface grinding machines. We produce high-quality single-cavity, multi-cavity, and family molds designed for durability, optimized thermal performance, and cycle efficiency, ensuring long mold life and stable part output.

Versatile Production Capacity

Holly operates more than 40 injection molding machines with clamping forces from 80T to 1000T, allowing us to handle projects from small prototypes to high-volume production runs. We process a broad range of thermoplastics, including ABS, PP, PC, POM, PA, and advanced materials such as PEEK and glass-reinforced polymers, making us ideal for both standard and engineering-grade applications.

Engineering-Led Production Support

Our team of 10+ experienced molding engineers provides proactive technical support, including DFM analysis, gate layout optimization, and mold flow simulation. This allows us to help clients prevent common issues like sink marks, warping, or flow lines, especially in parts with tight tolerances or complex geometry.

ISO-Certified Quality & Global Fulfillment

Holly is ISO 9001 certified and follows rigorous inspection protocols throughout the manufacturing process. We ensure full batch traceability, on-time delivery, and international packaging standards for smooth global distribution. With clients in over 30 countries, we’re proud to be a trusted supplier that combines Chinese production scale with global expectations.

If you’re comparing plastic molding companies in China, Holly stands out with its in-house tooling strength, engineering depth, and responsive international service, helping you move from design to mass production with speed and confidence.

Reviews from Our Plastic Injection Molding

We’ve worked with several plastic molding companies in China, and Holly remains our top choice. Their mold quality is excellent, and the parts always meet our specs without the need for extra finishing.

Thomas R.

Our product required high-precision PC parts with complex geometries. Holly’s team helped refine the design for manufacturability and delivered perfect results on the first batch.

Amanda G.

We ordered over 60,000 large appliance housings, and Holly kept a tight delivery schedule over four shipments. The quality was consistent throughout, and the packaging was export-ready.

David L.

What sets Holly apart is their engineering support. Their mold flow analysis helped us avoid potential issues before tooling began. Saved us time and rework later.

Natalie M.

Even at low quantities, Holly gave us full attention. Our 1,000-unit test run of ABS enclosures arrived exactly on time with perfect cosmetic surfaces.

Eric Z.

The mold Holly built for our automotive project has now produced over 100,000 cycles with minimal wear. Their tooling quality is as good as it gets at this price point.

Grace T.

We needed insert molding with tight pin alignment for an industrial product. Holly nailed it—zero misalignment across the entire batch. Very impressive.

Leo F.

Holly provided full material traceability and compliance documents for our medical device components. Their QA documentation passed our internal audit without issue.

Julia S.

The surface texture and dimensional stability on our glass-filled nylon parts were better than expected. We’ve already recommended Holly to another supplier in our network.

Mark D.

From quotation to delivery, the entire process was smooth. Holly’s communication was fast, and their team was quick to adapt when we needed minor design revisions.

Stephanie K.