... all 100% envirionmental friendly materials with character of water proof and fire proof). Specification: ... , 8.5mm, 9.0mm, 9.5mm, 10.0mm, 10.5mm, 11.0mm, 11.5mm, 12.0 ... protection product: Adopting natural gypsum material free of any harmful material. 6). Non-flammable B1 ... for long under normal changes of. 10). Small expansion: Little coefficient of expansion, deforming under normal temperature ...