Classification of sealants and caulking materials used for gap filling, waterproofing, and airtightness in manufacturing sites. Used for sealing between parts during machinery assembly and maintenance, sealing pipe connections, and waterproofing buildings and equipment. Includes material-based products such as silicone-based, urethane-based, acrylic-based, and modified silicone-based types, as well as products with special functions like heat resistance, chemical resistance, and conductivity. Unlike adhesives, these materials are specialized for sealing and filling functions and are available in various forms including cartridge type, tube type, and can type.