502 strong glue, colorless transparent liquid with good fluidity, easy to volatilize, polymerization and curing when exposed to water. This product is single component, fast curing speed, convenient to use, strong adhesive force, wide range of bonding materials, and can be used in steel, nonferrous metals, rubber, leather, plastic, ceramics, glass, wood, etc, however, it is used for polyethylene, polypropylene and polytetrafluoroethylene products, and the surface of the material needs special treatment. Widely used in electrical appliances, instruments, machinery, electronics, optical instruments, medical treatment, light industry and civilian industries.