tyThere is no dro of water to emerge in the back (CNS 13778)Impact resistanceNo carck,strip and run through (CNS 13778)Thermal resistance1.14m2K/W (GB/T13475-92)Sound insulation>44db (GBJ121-88)Security no asbestosCharacteristics:(1)Fire prevention and stop burningMeasured through national authoritative organization, the board is the A Grade not-burning material. The wall and steel construction which are comprised by this materials, its fire-resistant limit is far than the national standard.(2)B