Custom Plastic Injection Molding – Best China Plastic Injection Moulding Manufacturer, Supplier

Welcome to Holly – your reliable partner for custom plastic injection molding in China! With over 20 years of manufacturing expertise, Holly provides cost-effective and technically robust solutions for global clients in automotive, smart electronics, home appliances, industrial machinery, and medical devices.

As a trusted provider of China plastic injection moulding, Holly offers full-service support across the entire production cycle—from product design assistance and in-house mold fabrication to injection molding, finishing, assembly, and inspection. Whether you need small precision components or large structural housings, we’re equipped to deliver high-quality results at scale.

High-Capacity Mold Fabrication & Tooling Expertise

Our in-house tooling workshop is equipped with advanced CNC machines, EDM systems, and high-precision grinders to create complex, multi-cavity, and large-format molds. For large plastic parts, we focus on steel selection, optimized runner/cooling layouts, and mold durability to ensure consistent long-term production.

40+ Injection Molding Machines, Up to 1000 Tons

Holly operates more than 40 injection machines ranging from 80T to 1000T, with capabilities to mold large parts such as automotive interior panels, appliance housings, equipment covers, and structural industrial components. We support a wide range of thermoplastics, including ABS, PC, PP, PA, POM, and engineering-grade resins like PEEK and Glass-Filled Nylon.

Engineering-Led Part Optimization

Our team of 10+ senior molding engineers brings expertise in DFM optimization, mold flow simulation, and shrinkage management—especially critical in large part molding where warpage control, gating strategy, and structural strength must be balanced. We collaborate closely with clients to refine designs before tool kickoff.

Speed, Scalability & Global Delivery

We provide quick mold sampling within 7–10 working days, and mass production deliveries typically within 2–3 weeks. With ISO 9001-certified quality systems, full batch traceability, and international logistics support, Holly ensures reliability from prototype to large-scale production—no matter the part size or complexity.

Whether you’re developing oversized enclosures, heavy-duty panels, or multi-component assemblies, Holly is your dependable partner for large-part plastic injection molding in China, bringing together tooling strength, process control, and global delivery capabilities.

Reviews from Our Plastic Injection Molding

We ordered large ABS housings for industrial air purifiers, and Holly handled the project seamlessly. The surface finish and structural integrity were excellent, even on complex rib structures.

Dennis Y.

Holly is one of the few suppliers we trust for large part injection molding in China. Their 1000-ton machine capacity allowed us to mold our automotive dashboard panels in a single shot with minimal warpage.

Clara M.

From concept to mold to production, Holly delivered consistent quality for our oversized appliance back covers. The team provided valuable DFM insights that improved both strength and moldability.

Julian K.

We had concerns about sink marks and deformation on thick sections, but Holly’s tooling strategy resolved those issues early on. Their engineering team really knows how to handle large molded parts.

Rachel Z.

The turnaround time for our 750 mm-wide enclosure was impressive—samples in 9 days, full batch delivered within three weeks. Their logistics handling was professional, and parts arrived safely.

Simon H.

We’ve had warping issues with other molders in the past. Holly’s mold flow analysis and gating strategy helped us get flat, dimensionally stable parts from the first run.

Amanda P.

Our project involved a two-shot mold for a large equipment housing with an insert. Holly executed both mold design and part production flawlessly. The assembly fit was perfect.

Kevin L.

I was impressed by their ability to maintain part consistency over a 30,000-unit run of large PC panels. Dimensional deviations were minimal, and the surface quality was consistent.

Mia C.

Even at low volumes, Holly took our large prototype parts seriously. Their team treated our trial run with full QC and packaging standards. We’ve since expanded to full production with them.

Tomas E.

The tooling Holly built for our 1000T machine project was robust and well-balanced. After 60,000 cycles, the parts are still coming out clean. Their mold quality is top-tier.

Sophie N.