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Shrinkage The difference between the room temperature plastic article dimensions and the room temperature dimensions of the mold. A volume reduction in polymers that occurs during cooling due to a reduction in space between the molecules.
The percentage of a Part lost as a result of the process. A Shrinkage Factor is generally applied to all usage of a Part and so is entered into the Item Master File. Yield, on the other hand, is generally applied to one use of a Part and so is entered on the Bill of Material.
Types of shrinkage
Shrinkage in a piece of lumber that occurs across the growth rings as it begins to dry.