NF EN ISO 294-4

NF EN ISO 294-4

February 2019
Standard Current

Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 : determination of moulding shrinkage

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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Main informations

Collections

National standards and national normative documents

Publication date

February 2019

Number of pages

18 p.

Reference

NF EN ISO 294-4

ICS Codes

83.080.20   Thermoplastic materials

Classification index

T51-294-4

Print number

1

International kinship

ISO 294-4:2018

European kinship

EN ISO 294-4:2019
Sumary
Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 : determination of moulding shrinkage

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.

Replaced standards (1)
NF EN ISO 294-4
May 2003
Standard Cancelled
Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 : determination of moulding shrinkage

Le présent document décrit une méthode de détermination du retrait au moulage et du post-retrait des éprouvettes des matériaux thermoplastiques moulées par injection, parallèlement et perpendiculairement à la direction des écoulements.

Table of contents
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  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Appareillage
  • 5 Mode opératoire
  • 6 Expression des résultats
  • 7 Fidélité
  • 8 Rapport d'essai
  • Annexe A (informative) Points de référence des mesurages de longueur et de largeur
  • Bibliographie
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