scope:

This part of ISO 1873 specifies procedures for moulding test specimens of polypropylene materials under specified moulding conditions and methods for measuring their properties. No figures are quoted for these properties. Those required for the designation of polypropylene materials for moulding and extrusion are given in ISO 1873-1. Other properties are determined by the appropriate methods referred to in this part of ISO 1873 and values may be obtained from manufacturers' literature. Values should only be compared if the procedures described herein for preparing the test specimens and for determining the properties are followed. The values determined in accordance with this part of ISO 1873 will not necessarily be identical to those obtained using specimens of different procedures. They may also be influenced by colorants and other additives. The values obtained for the properties of a moulding depend on the moulding compound, the shape, the test method and the state of anisotropy. The last-mentioned depends on the gating and the moulding conditions, for example temperature, pressure and injection rate. Any subsequent treatment must also be considered, for example conditioning or annealing.