Injection Mold Design Guide < 1080p • 2K >

Injection molding is the undisputed king of high-volume plastic part production. It allows manufacturers to create complex geometries with tight tolerances at a remarkably low cost per unit. However, the difference between a part that pops perfectly out of the mold every 30 seconds and one that warps, sinks, or cracks is entirely determined before the steel is cut.

| Material | Shrinkage | Mold Steel | Vent Depth | Corrosion Risk | | :--- | :--- | :--- | :--- | :--- | | | Low | P20 (standard) | 0.03mm – 0.05mm | Low | | PC (Polycarbonate) | Low | H13 / Stainless | 0.02mm – 0.03mm | Low (requires dry steel) | | PVC | High | Stainless (420) | 0.01mm – 0.02mm | High (releases HCl gas) | | POM (Acetal) | High | P20 / H13 | 0.01mm | Moderate (degassing needed) | | Glass-filled Nylon | Low | Hardened H13 | 0.02mm (abrasive) | Low (abrasive wear on gates) | injection mold design guide

Implement these principles early, run a mold flow analysis, and respect the polymer. Your reward will be shorter lead times, lower tooling costs, and parts that fit right the first time. Need a downloadable checklist? Review sections 9 and 4 to create your internal design review form. Injection molding is the undisputed king of high-volume

Remember: "It looks good on the computer" is not the same as "It ejects reliably on a cycle." | Material | Shrinkage | Mold Steel |