Sponge is a porous material that has good water absorption and can be used to clean items.
The commonly used sponges are made of wood cellulose fibers or foamed plastic polymers. In addition, there are natural sponges made from sponge animals, most of which are used for body cleaning or painting. In addition, there are three types of synthetic sponges made of other materials, namely low-density polyether (non-absorbent sponge), polyvinyl alcohol (high-absorbent material, no obvious pores) and polyester.
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