Commonly used sponges are made of wood cellulose fibers or foamed plastic polymers. In addition, there are also natural sponges made of sponge animals. Most natural sponges are used for body cleaning or painting.
Sulfuric acid paper is made of fine plant fibers intertwined with each other and subjected to free pulping, no sizing, no fillers, papermaking in a humid state, and then soaked in 72% concentrated sulfuric acid for 2 to 3 seconds, washed with water and then glycerin It is a hard film-like substance formed after treatment and final drying. The texture of sulfuric acid paper is firm, dense and slightly transparent. It has the characteristics of strong resistance to oil and water penetration, airtightness, and high humidity. It can be waterproof, moisture-proof, oil-proof, sterilization, and disinfection.
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