scope:

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. In contrast to ISO 2577, which describes the determination of shrinkage for thermosets, this part of ISO 294 excludes the effects of humidity uptake on moulding shrinkage. For cases when post-moulding shrinkage is caused by the uptake of humidity only, see ISO 175. The measurement of moulding and post-moulding shrinkage is useful in making comparisons between thermoplastics and in checking uniformity of manufacture.