First, there are 2 kinds according to natural nature
1, natural sponge: It is a cultivated animal in the ocean.
2, artificial sponge: is a chemical product, also known as synthetic sponge, chemical sponge, synthetic with polyurethane and other raw materials artificial foam, is also a common sponge. Sponge is a kind of polyurethane foam.
Two, according to the combustion performance of common divided into 2 kinds
1, ordinary sponge: flammable, poor fire performance
2, flame retardant sponge: also known as fire retardant sponge, fire retardant cotton, flame retardant cotton, the chemical name is polyurethane foam material, generally is a fireproof material composed of polyurethane added flame retardants; Soft bubble (mainly used for furniture) and hard bubble (mainly used for insulation); Self-extinguishing from fire, the sponge will not produce an open flame when it is burned by the fire source.
Three, there are two kinds according to the rebound characteristics
1, high resilience sponge: also known as high resilience sponge, press down with the hand to quickly restore, resilience is very strong.
2, slow rebound sponge: also known as slow spring cotton, memory sponge, memory cotton, inert sponge, low rebound sponge, zero pressure sponge, press down slowly to restore the original shape, mainly used for mattresses, pillows and so on.
Four, there are three common types according to density
1, high-density sponge: density ≧25 kg/cubic meter.
2, medium density sponge: density in 18 ~ 25 kg/cubic meter.
3, low density sponge: density < 18 kg/cubic meter.
kg/ cubic meter (kg/m) refers to the weight of sponges per cubic meter. For example, the sofa seat surface is 25 kg/m, that is, the weight of each cubic meter of sponge is 25 kg. Mattress bedding 20 kg/m, that is, the weight of each cubic meter of sponge is 20 kg.