... is made of content of Mgo, MgCl2, alkali-resistant glassfibre mesh, plantfibre, natural perlite and modifying agent etc. Production specification:1200 ... , which is light enough to reduce 60% pressure from interior wall, and save room around 5 to 8 percent. It is ... in four layers, and approximate to the 150mm ordinary solid brick wall. This guarantees a quiet place for living.8. Functional:Mgo ...