GSO ISO 294-4:2021
塑料 热塑性材料试样的注射成型 第4部分：成型收缩率的测定

Plastics — Injection moulding of test specimens of thermoplastic materials — Part 4: Determination of moulding shrinkage

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标准号

GSO ISO 294-4:2021

发布

2021年

发布单位

GSO

当前最新

GSO ISO 294-4:2021

 

 

适用范围

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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