Stability, good corrosion resistance long use, not aging, does not decompose harmful substances, their chemical performance is extremely stable and will not cause corrosion due to water absorption and degradation of its performance decline in the high temperature environment can still maintain its superior performance, according to the information, XPS extruded insulation board even with 30 to 40 years, can still maintain excellent performance, and does not decompose or mildew, no volatile toxic substances.