The inner stuffing is the polyester sponge, its foaming density is 33kg/cubic meters; the closed-cell type foaming has not only good sound insulation effect, but also meet the national 10010 self-extinguishment flame-retardant standards of China. Additionally it can withstand acid, alkali and oil very well. The outer material is the coated fabric, made from terylene and pes, with the thickness of 0.8mm and the special surface treatment. The outer material has not only the good surface self-cleaning property, but also complies with German DIN 75200 fireproof standard. The outer material is adapted to the temperature of -30~+70℃, and has good acid, alkali and oil resistance.