Sealants are used to close gaps between surfaces and protect joints from moisture, dust, and other environmental elements. This category includes products like silicone, polyurethane, and polysulfide sealants, which not only prevent fluid leakage but also provide thermal and acoustic insulation. Sealants are essential in construction and assembly for ensuring airtight and watertight seals, enhancing the energy efficiency of buildings and the longevity of various structures. Their flexibility and adherence properties make them ideal for accommodating slight movements and temperature changes without cracking or losing effectiveness.