PU & POLYSULPHIDE SEALANTS

Polyurethane (PU) and polysulfide sealants are two types of versatile materials commonly used in construction and manufacturing industries for sealing joints and gaps in various structures.

Polyurethane sealants are elastomeric materials known for their excellent adhesion properties, flexibility, and durability. They are resistant to weathering, moisture, and chemicals, making them suitable for both interior and exterior applications. PU sealants cure by reacting with moisture in the air, forming a tough and flexible seal that can accommodate movement in the substrate without losing adhesion. This characteristic makes them ideal for sealing expansion joints, concrete cracks, and gaps in buildings, bridges, and other structures. Additionally, polyurethane sealants are available in various formulations to suit specific requirements, such as fast-curing, low-modulus, and high-temperature-resistant variants.

On the other hand, polysulfide sealants are elastomeric materials that contain polysulfide polymers as their primary constituents. They offer excellent resistance to water, chemicals, and extreme temperatures, making them suitable for applications where long-term durability is essential. Polysulfide sealants are often used in demanding environments such as airports, highways, and industrial facilities where exposure to harsh conditions is common. They cure through a chemical reaction between the polysulfide polymer and a curing agent, forming a resilient and flexible seal that remains intact even under continuous exposure to harsh environmental factors. Polysulfide sealants are particularly favored for sealing joints in concrete structures, such as airport runways, as well as for marine applications due to their resistance to saltwater and other corrosive substances.

Both PU and polysulfide sealants offer distinct advantages and are chosen based on the specific requirements of the application. While polyurethane sealants are valued for their fast curing time and flexibility, polysulfide sealants are preferred for their superior chemical resistance and long-term durability. Ultimately, the selection between these two sealant types depends on factors such as the substrate material, environmental conditions, and performance expectations.