Hair foam polyether foam molding with this material, like foam bread. Available machinery foam can also be manually with wood surround foam, foamed cotton seemed like a square loaf, sliced ??through the process using a slicer, cutting thickness according to the different requirements, the foam can also adjust the firmness . Block cotton generally use 25 ~ 28kg / m5, the other using 20 ~ 22kg / m3 density. Jinan sofa refurbished sponge hardness and density although there is a direct relationship, but with a different additive formulations also have relationships within the industry and therefore at high elastic, gray super, super dark gray, soft cotton. Products should be designed to be used depending on the shape, structure reasonable scientific mix of general refurbishment Chongqing sofa, middle, low three parts with different elasticity, density sponge. "There is a fire cotton sponge material is called, in fact, is a former sponge foam, fire retardant material formulation is added, such as chlorine, bromine can produce a flame smoke when making sponge on fire, play a flame retardant.