ISO-294-4 › Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage

ISO-294-4 - 3RD EDITION - CURRENT
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This document specifies a method of determining the moulding shrinkage and post-moulding shrinkage of injection-moulded test specimens of thermoplastic material in the directions parallel to and normal to the direction of melt flow.

For the determination of shrinkage of thermosets, see ISO 2577[2].

Moulding shrinkage as defined in this document excludes the effects of humidity uptake. This is included in post-moulding shrinkage and thus in total shrinkage. For cases when post-moulding shrinkage is caused by the uptake of humidity only, see ISO 175[1].

Moulding shrinkage as defined in this document represents the so-called free shrinkage with unrestricted deformation of the cooling plates in the mould during the hold period. It is considered, therefore, as the maximum value of any restricted shrinkage.

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Document Number

ISO 294-4:2018

Revision Level

3RD EDITION

Status

Current

Publication Date

Dec. 1, 2018

Committee Number

ISO/TC 61/SC 9