For quite a period screen life tests for rating the quality and dipersibility tests of colorants in polymer melts have been performed. But the comparison of those test were poor. The draft of the new standard EN 13900-5 describes now a procedure which increases the comparability of those tests. On one hand this standard describes which kind of extruder, melt pump, sieves and breaker plate have to be used and on the other hand the composition of mixture, the test routine and the evaluation is described. 多功能轉(zhuǎn)矩流變儀HAAKE PolyLab OS