Polyuretaanitiivistemassat

Polyuretaanitiivistemassat, known in English as polyurethane sealants, are a type of elastic material commonly used for sealing joints and gaps in construction and industrial applications. They are based on polyurethane chemistry, which provides them with a unique set of properties. These sealants typically cure through a reaction with moisture in the air, forming a durable, flexible, and rubber-like substance.

The primary advantage of polyurethane sealants is their excellent adhesion to a wide range of substrates, including concrete, wood, metal, and many plastics. They offer good resistance to weathering, UV radiation, and chemical exposure, making them suitable for both interior and exterior use. Their flexibility allows them to accommodate movement in joints, preventing cracks and leaks caused by thermal expansion and contraction.

Polyurethane sealants are available in various formulations, including one-component and two-component systems. One-component sealants are ready to use directly from the cartridge and cure upon exposure to atmospheric moisture. Two-component sealants require mixing of the base and hardener before application, often resulting in faster curing times and enhanced mechanical properties.

Applications for polyurethane sealants are diverse. They are widely used in building construction for sealing expansion joints in pavements, window and door frames, facade joints, and roofing. In automotive manufacturing, they are employed for sealing body panels and windshields. They also find use in marine applications, industrial assembly, and DIY projects where a strong, flexible, and weather-resistant seal is required. Proper surface preparation is crucial for achieving optimal adhesion and long-term performance.