Soft; does not scratch the surface of the body...
The composition of the sponge is mostly polyurethane
Just like foaming, the same material and different manufacturing processes will create different things.
Edit the types of sponges in this paragraph The types of sponges are divided into polyester sponges and polyether sponges. Polyester sponges are high-pressure sealing foams, and polyether sponges are box-type foams.
The characteristics of polyester sponge: strong tensile force, uniform pores, high density, stable performance of the produced sponge, commonly used in electronics, automobiles, printer consumables, precision instrument packaging, and electrical appliances. Compressed sponges are common.
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