1. Prevent from static, fire. 2. 5 years warranty period. 3. 10-20 years normal use time. 4. Calcium sulfate core,steel plate Structure: High density calcium sulphate core. Auxiliary materials are: natural gypsum, fiber, chemical additives, high-intensity polyester, and some auxiliaries are deriving from domestic waste. Features: 1. Has a pretty good thermal barrier effect, permanent non- ...