Increasing the flexural modulus of rigid PVC at elevated temperatures

The use of PVC building products in hot climates has demonstrated the need for formulations that exhibit increased stiffness at elevated temperatures. Talc has been used as an additive to increase flexural modulus but this approach can produce an unacceptable drop in impact strength. This report presents the results of laboratory work designed to find ways to increase the stiffness of rigid PVC compounds at elevated temperatures while maintaining their room temperature impact performance. J. VINYL. ADDIT. TECHNOL., 12:37–40, 2006.