Custom Plastic Injection Molding – Best Plastic Injection Molding Service Supplier in China

Welcome to Holly – your dependable partner for precision plastic injection molding in China! With over 20 years of hands-on manufacturing experience, Holly offers efficient, scalable, and high-quality plastic molding solutions trusted by clients in automotive, electronics, home appliances, medical equipment, and industrial sectors.

As a specialist in plastic injection molding service China, Holly delivers end-to-end solutions covering product development assistance, in-house mold fabrication, injection molding, finishing processes, and assembly. Whether your needs involve intricate small parts or large structural housings, we ensure manufacturing precision, material integrity, and dependable delivery timelines.

Tooling & Mold Making Expertise

Our in-house tooling center is equipped with advanced CNC machines, EDM systems, and surface grinders. We build multi-cavity, family, and complex molds with an emphasis on durability, optimized cooling, and production efficiency, ensuring long mold life and dimensional consistency across large volumes.

Flexible Molding Capabilities

With more than 40 injection molding machines ranging from 80 to 1000 tons, Holly supports a broad material range including ABS, PP, PC, POM, PA, and high-performance materials like PEEK and glass-filled polymers. We support both low-volume production and full-scale manufacturing, delivering initial samples in as fast as 7–10 business days.

Engineering Support That Adds Value

Our experienced team of 10+ molding engineers works directly with clients to provide DFM (Design for Manufacturability) guidance, mold flow analysis, and material selection recommendations. We help optimize part structure to control shrinkage, reduce warping, and improve moldability, especially for complex or tight-tolerance parts.

Certified Quality & Global Fulfillment

Holly is ISO 9001 certified, with strict process controls, full batch traceability, and comprehensive quality inspections at every stage. We have delivered millions of parts to over 500 global customers, offering secure international packaging and responsive logistics coordination to meet your delivery timelines.

If you’re looking for a reliable and professional plastic injection molding service in China, Holly is ready to support your project from concept to production with precision tooling, engineering strength, and consistent quality, helping you accelerate product launch and reduce production risks.

Reviews from Our Plastic Injection Molding

Holly’s injection molding service exceeded expectations. The mold design was spot-on, and our ABS parts came out with excellent surface finish and dimensional consistency.

Martin W.

We had urgent requirements for a low-volume production run of PC housings. Holly delivered samples in just 9 days, and the final parts were flawless. Fast and reliable.

Chloe S.

From DFM support to mold flow analysis, the engineering team at Holly helped us improve part strength while reducing cycle time. We appreciated their technical depth.

Ben L.

The PEEK components we ordered needed to withstand heat and chemical exposure. Holly’s process control delivered consistent performance across multiple batches.

Rachel T.

This was our first time working with a Chinese injection molding supplier, and Holly made the experience smooth. Communication was clear, and they delivered exactly what we needed.

Jonathan P.

Our product involved insert molding with threaded brass components. Holly maintained perfect alignment, and not a single part failed inspection during assembly.

Grace F.

We required RoHS-compliant PP material with certification for a medical device. Holly handled sourcing and documentation professionally. Parts arrived certified and on time.

Alex D.

The mold Holly built for us is running over 80,000 cycles now, and we haven’t needed any repairs. The steel quality and cooling design really hold up.

Vanessa K.

We received weekly production updates, detailed QC reports, and full traceability on our batches. Holly’s attention to documentation was exactly what we were looking for.

Kevin J.