The types of sponge sponge into polyester and polyether sponge, polyester sponge is pressurized foam, polyether foam sponge is box.

Polyester sponge

Polyester sponge characteristics: strong tension, pore uniformity, high density foam inoue, Japan, the Japanese bridgestone foam company production of sponge stable performance, and often used in electronic, automotive, printer consumables, precision instrument packaging, electrical appliances, common are compressed sponge

Polyether sponge

Polyether sponge characteristics: low density, tensile force is not strong, the appearance of hole not polyester, general is domestic production, and often used in packaging, furniture, electronics, electrical appliances, toys, bags, shoes, clothing and Sponge hardness

Sponge into thin medium thickness 3 kinds, among them the hard and soft and the points: 
   　1.thin(1.0mm以下-1.2mm),For the defensive play ;
　　2.in(1.2mm以下-1.7mm),Offensive and defensive combination type game ;
　　3.thick(1.7mm以下-2.0mm),Attacking play.
　　 Sponge hardness :
　　20-35°Attacking play
　　26-40°Neutral sponge
　　41-45°Tapping, playing with
　　46-55°Bajie would type (hard sponge)
　　56°≈Hard type