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.
EN ISO 294-4:2019 history
2019EN ISO 294-4:2019 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage
2003EN ISO 294-4:2003 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage
1998EN ISO 294-4:1998 Plastics - Injection Moulding of Test Specimens of Thermoplastic Materials - Part 4: Determination of Moulding Shrinkage ISO 294-4:1997