How are household sponges made?

Household sponges are typically made from synthetic materials like polyurethane or cellulose derived from wood pulp. The manufacturing process involves mixing the base materials with water and additives, then pouring the mixture into molds where it expands and solidifies. After curing, the sponges are cut into desired shapes and sizes, and may undergo additional treatments for enhanced absorbency or antibacterial properties. Finally, they are packaged for distribution and sale.