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Homepage>BS Standards>83 RUBBER AND PLASTICS INDUSTRIES>83.080 Plastics>83.080.20 Thermoplastic materials>BS EN ISO 294-4:2019 Plastics. Injection moulding of test specimens of thermoplastic materials Determination of moulding shrinkage
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BS EN ISO 294-4:2019 Plastics. Injection moulding of test specimens of thermoplastic materials Determination of moulding shrinkage

BS EN ISO 294-4:2019

Plastics. Injection moulding of test specimens of thermoplastic materials Determination of moulding shrinkage

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Standard number:BS EN ISO 294-4:2019
Pages:18
Released:2019-02-11
ISBN:978 0 580 92865 9
Status:Standard
DESCRIPTION

BS EN ISO 294-4:2019


This standard BS EN ISO 294-4:2019 Plastics. Injection moulding of test specimens of thermoplastic materials is classified in these ICS categories:
  • 83.080.20 Thermoplastic materials

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.