Injection Molding in China: Complete Guide
TL;DR: China produces 60%+ of the world's plastic injection molded parts. Mold costs are 40–60% less than US/EU. Simple molds start at $1,500–$3,000; complex multi-cavity molds can reach $50,000+. Lead time: 3–6 weeks for mold making, then mass production at thousands of parts per day.
Why China for Injection Molding?
- Cost: Mold making costs 40–60% less than US/EU. A mold that costs $10,000 in the US might cost $4,000–$6,000 in China.
- Speed: Chinese mold makers work faster — 3–6 weeks vs 6–12 weeks in the West.
- Scale: The Yangtze River Delta (Shanghai, Ningbo, Suzhou) and Pearl River Delta (Shenzhen, Dongguan) have enormous injection molding capacity.
- Integration: Many Chinese factories offer one-stop service — mold making + injection molding + assembly + packaging.
Mold Costs
| Mold Type | Cost Range (China) | Lifespan | Best For |
|---|---|---|---|
| Prototype (aluminum) | $1,500 – $5,000 | 1,000–10,000 shots | Testing and validation |
| Production (P20 steel) | $3,000 – $15,000 | 100,000–500,000 shots | Medium-volume production |
| High-volume (H13 steel) | $8,000 – $30,000 | 500,000–1M+ shots | High-volume, long-term production |
| Multi-cavity | $15,000 – $50,000+ | 1M+ shots | Very high volume, maximizing output |
Common Plastic Materials
| Material | Properties | Common Uses |
|---|---|---|
| ABS | Strong, impact resistant, easy to paint | Electronics housings, toys, consumer products |
| PC (Polycarbonate) | Transparent, very strong, heat resistant | LED covers, phone cases, safety equipment |
| PP (Polypropylene) | Flexible, chemical resistant, food safe | Food containers, bottle caps, living hinges |
| PA (Nylon) | High strength, wear resistant | Gears, structural parts, automotive |
| TPU/TPE | Soft, rubber-like, flexible | Phone cases, grips, overmolding |
Quality Control for Injection Molding
- T1 samples (first trial): Always request T1 samples from the new mold. Check dimensions, surface finish, and material quality.
- Dimensional inspection: Use calipers and CMM (Coordinate Measuring Machine) to verify critical dimensions match drawings.
- Material certification: Request material certificates (COA) from the resin supplier to verify grade and composition.
- Visual standards: Define acceptable levels for sink marks, flash, flow lines, and weld lines. Create a golden sample.
- Functional testing: Test assembled parts for fit, function, and durability before approving mass production.
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