本文件规定了在平行于和垂直于熔体流动方向的方向上测定热塑性材料的注射模制试样的模制收缩和模制后收缩的方法。 热固性材料收缩率的测定参见ISO 2577[2]。 如本文所定义的模制收缩不包括吸湿的影响。这包括在模制后收缩中，因此也包括在总收缩中。对于成型后收缩仅由吸湿引起的情况，参见ISO 175[1]。 如本文所定义的模制收缩表示所谓的自由收缩，其中冷却板在保持期间在模具中不受限制地变形。因此，它被认为是任何受限收缩的最大值。

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.