Supplier's Category: All Injection Molding: High-volume plastic production and overmolding
Injection molding injects molten plastic into a steel or aluminum mold under pressure to produce high volumes of identical parts, including overmolded multi-material components. It’s the dominant process for plastic parts once volume justifies the mold cost.
Mold cost is the deciding factor — a steel production mold can run tens of thousands of dollars, so injection molding only pays off once volume is high enough to spread that cost per part.
- High volume production: thousands to millions of identical parts
- Overmolding: combining a rigid substrate with a soft-touch or sealing material in one part
- Aluminum tooling for lower-volume or bridge production before committing to steel
Related terms: injection molding, overmolding, insert molding, mold flow analysis, gate and runner design, resin selection (ABS, PC, nylon, POM), cycle time optimization, cavitation (single vs. multi-cavity), cosmetic vs. structural grade tooling
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What separates molders on part quality
Two molders running the same resin on similar presses can produce very different results depending on process control.
Questions worth asking
- Do they run mold flow simulation before cutting steel, to catch sink marks and short shots early
- What’s their scrap/reject rate on comparable parts, and how is it tracked
- Who owns the mold at the end of the relationship, and where is it stored