Silicone sealant contains inorganic substance whereas polyurethane sealant is organic in its composition. Silicone sealants are easy to extrude and smooth off, resistant to ageing, high service temperatures and chemicals. They can adhere to building materials such as glass, ceramic and aluminium. They are often used for sealing expansion joints in wall and floor coverings of ceramic and cement that are not subject to heavy abrasion, plumbing fixtures and sanitary ware such as bathtubs, basins, showers, expansion joints in swimming pools, around doors, windows, utility cable, etc.
Polyurethane sealants on the other hand, can adhere to a wide range of building materials such as cement-based products, bricks, steel, aluminium, general pre-painted surfaces, glass, wood-based materials, gypsum, ceramics, plastics, etc. They have high mechanical and wear resistance, resistant to chemical and corrosion, are highly adhesive and paintable with elastic paint.
Polyurethane sealants are useful as a heavy-duty adhesive and sealant. It is suitable for industrial floors subject to vehicular traffic, concrete floors and walls, sealing pipe-work systems and cables, sealing general fillet joints, etc. It can also be used for constructing and finishing building works such as skirting boards, bathroom fittings, window sills, etc.