Plastic Injection Terminology

Plastic Injection Molding Terminology

These terms are used in the injection molding process. Use these and our design guidelines to help produce a quality injection moldable design.

Part   Tooling   Shrink Rate   Gate   Vestige   Shear   Runner   Short Shot   Sprue   Hand Pull

Slide   Gibbs   Cam/Horn Pin   Ejector Pins   Undercuts   Core   Cavity   Core Outs   Line Of Draw   Side Action

Piece Price   SLA   FDM   Operator   Wall Thickness   Thin Wall Molding   Boss   Ribs   Sink Marks   Warp

Draft   Heel   Stock Safe   Bulk Pack   Reverse Engineering

Part  Refers to customer's custom plastic part to be made.

Tooling  Refers to the injection mold that is created to make plastic parts in the molding process

Shrink Rate  Refers to how much the plastic material will shrink after cooled. This percent of shrink is added to the part before the mold is designed. Every plastic material has its own shrink rate ranging from .001 per inch to as much as .060 per inch. Although most fall in between .004 and .021. It is important when selecting a range of plastic materials that you may want to test before building the injection mold. For example if you wanted to use ABS which is .006 per inch and Nylon which is .015 per inch you may want to build the injection mold to .010 or leave critical dimensions stock safe until a final material is selected

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