Covidone (PVP/VA) is a copolymer of polyvinylpyrrolidone and polyvinyl alcohol acrylate, which has excellent hydrothermal properties, corrosion resistance, and biocompatibility. It is widely used in industries such as medical devices, food packaging, and cosmetics. Compared to polyvinylpyrrolidone, the mechanical properties of co polyvinylpyrrolidone are slightly inferior, but it has strong hydrothermal stability and does not decompose when exposed to water. It can perform bonding work in humid environments.