Balance between drop dart and Izod impact: predicting performance in PVC window profile compound

摘要

Drop Dart Impact Testing is now widely used to predict the performance needed in window profile fabrication and use. It evaluates formulation effects and strength developed through proper processing. Izod Impact Testing has shown some utility as a predictor of not only strength, but as a better way to differentiate ductility and crack propagation properties of profile compounds, important in the fabrication stage. This paper will discuss the relative merits of both tests, and how they can be used to differentiate additives that contribute to impact and fabrication performance.