Strength of modified polyvinyl chloride films taking account of operating conditions

Experimental data are given for the strength and deformability of a wide range of polyvinyl chloride films obtained by combining different grades of polyvinyl chlorides and modifiers. The effect is considered of temperature and longterm climatic factors on the strength of these materials. The possibility is demonstrated of predicting the change in deformability of polyvinyl chloride films under conditions of natural solar radiation on the basis of results of rapid tests under the action of ultraviolet light.