Who We Are
Ningbo Ruijing Mold & Plastic Co., Ltd. is a small, focused OEM manufacturer based in Ningbo, Zhejiang — China's "Capital of Molding," just 30 minutes from the Ningbo-Zhoushan Port. We're deliberately lean: a founder-led team with 10+ years of hands-on injection molding expertise, from product design and mold design to molding processes and production automation.
We're not a traditional trading company. We bridge the gap between small-factory pricing and large-factory quality — and we bring deep technical knowledge that most suppliers simply don't have, including high-temperature precision molding of engineering plastics like PEI, PSU, PPS and PPO.
Beyond plastic, we machine precision metal parts on our in-house CNC — and manage stamping and die-casting through vetted partners, with quality and delivery always owned by us. With metal OEM and full product development experience, we take on your complete product, not just the plastic parts.
What Makes Us Different
Small, Skilled & Responsive
A lean team with big-factory capability. No layers of approval — you get same-day responses, even outside business hours. Lower overhead means better prices without cutting quality.
Small-Order Friendly
Unlike big factories that dismiss small orders, we treat every customer and every order with the same care — from prototype to mass production.
Engineer-to-Engineer Communication
You talk directly to our engineers, not a sales rep who can't answer technical questions. Faster, clearer communication — your project moves twice as fast.
Right-First-Time Mold Trials
Because we make our own molds and trial them on our own injection machines, we iterate fast — that's why most molds pass at T1, without T2 or T3 iterations. Every project comes with a DFM report, mold flow analysis and full 3D mold design.
Mold Design That Thinks Ahead
When we design a mold, we already consider the injection cycle time, automation and part quality downstream — so your mold produces faster, runs automated, and holds quality from day one.
Proactive Quality
Every product and mold ships with inspection reports. We run IQC, IPQC and OQC checks proactively — even when the customer doesn't require them.
Design-Stage Partner
We join at the product development stage, helping customers with no plastic-part experience design products that are manufacturable from day one.
We Love What We Do
We're genuinely passionate about injection molding — it's not just business. That passion shows in the quality of every mold and part we ship.
Our Core Team
Led by founder Sam Qian, our team combines young engineering talent with veteran mold makers. We speak the language of CAD files, material data sheets, and tolerance callouts.
"Quality isn't one final check at the end. It's every decision from mold steel selection through process parameters to the last QC sign-off before shipment."
— Sam Qian, Founder & General Manager
Our Team at Work
Facility Overview
| Area | Function |
|---|---|
| Mold Workshop | CNC machining, grinding, milling, drilling, tapping |
| Injection Workshop | Haitian injection machines, automated auxiliaries |
| PU Foaming Workshop | Dedicated PU foaming line, constant temperature/humidity control |
| QC Lab | Precision measuring instruments, hardness testers, dimensional gauges |
| Assembly & Packing | Secondary operations, ultrasonic welding, kitting, export packing |
Our Promise
- Quote in 24 hours (with complete 3D/2D files)
- Weekly production updates with photos
- QC report with every shipment
- One dedicated project contact — not a rotating cast
- Support beyond delivery — we follow up on any issue until it's resolved
- We welcome your feedback — your input genuinely helps us keep improving