The UPVC profile adopts a unique formulation to improve its cold resistance. UPVC window can be used for a long time in the environment with large temperature difference (-50℃~70℃), and the sun exposure and humidity will not make it deteriorate, aging, embrittlement and other phenomena. The original UPVC Windows have been in use for 30 years and their materials are as good as ever. Press this calculate, service life of window of window of model steel below normal condition can amount to 50 years above.