Shrinkage Rate Guide
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Plastic material shrinkage happens as a molded part contracts while cooling after injection. Every material has a different shrink rate depending on the resin family (amorphous vs. crystalline materials), mold design, and processing conditions.
This Molding Material Shrink Rate Guide details typical mold shrink rates, along with tonnage recommendations and vent depth values, for several commonly used to moderately used materials and high-heat resins.
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