ISO 294-4 Test Standard Explained
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Mold Shrinkage - ISO 294-4
This standard covers the measurement of specimen shrinkage for injection and compression molding. Data for mold shrinkage should be used for material comparison. Actual mold shrinkage values are highly dependant on part geometry, mold configuration, and processing conditions.
Mold Shrinkage SpecimenMold shrinkage for many materials differs for flow and transverse (or across flow) directions. Flow direction is taken as the direction the molten material is traveling when it exits the gate and enters the mold. Mold shrinkage is expressed as a percent change in dimension of a specimen in relation to mold dimensions.
Measurement OrientationMold shrinkage in the flow direction is calculated by:
Mold shrinkage in the transverse direction is calculated by:
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