Sponge earcap will foam resin, foaming agent and a binder resin (making the finished product has adhesion) are mixed together; B. foaming processing. The 80 copies of ethylene vinyl acetate (EVA), 20 APAO PT 3385, 20 azo two formamide, L9 CaCO and 0.6 phr peroxide two cumene mixed together, foaming in the mold, and broken by mechanical force of closed-cell foam sponge, can be prepared. The density (d) of 0.028 g/cm, compression hardness of 25% to 1.9 KPa.

Ear sponge sponge was mostly polyurethane with foam manufacturing process will be the same as the materials of different makes things PU sponge consists of polyester and polyether type can be sliced or winding, or composite processing according to customer requirements, manufacturing and the blasting hole processing etc.. PU sponge because of its insulation, heat insulation, sound-absorbing, shock absorption, flame retardant, antistatic, good air permeability characteristics, it relates to a variety of industries, including the automotive industry, battery industry, cosmetics industry, bra and underwear manufacturing and furniture manufacturing.