EN
SR EN ISO 294-4:2019
Materiale plastice. Formarea prin injecție a epruvetelor din materiale termoplastice. Partea 4: Determinarea contracției la formare
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.
Status :
In vigoare
Data aprobării : 31.07.2019
Număr de pagini : 20
ICS : 83.080.20 Materiale termoplastice
Comitet tehnic : 108 - Materiale plastice şi cauciuc, metode de analiză şi produse
- Inlocuieste SR EN ISO 294-4:2003
- Inlocuieste SR EN ISO 294-4:2003/AC:2011