Polyurethane sealant and polysulfide sealant are two types of high performance elastic materials used for joint waterproofing and sealing. They bond tightly with substrate surfaces through their inherent adhesion, forming a continuous elastic sealing layer after curing that effectively blocks the ingress of water, gas and debris, while accommodating joint displacement caused by temperature changes or slight structural movement. Applications span building curtain wall joints, road and bridge expansion joint sealing, waterproof nodes of underground works, and airport pavement joints.
Based on differences in chemical system and curing mechanism, sealant products are grouped into multiple categories. Each category offers specific characteristics in displacement accommodation, weather resistance and applicable environments, allowing precise selection for different engineering conditions and construction requirements.
Polyurethane Sealant
Based on polyurethane prepolymer, this sealant forms a highly elastic sealing layer after curing, with favorable displacement accommodation and bond strength. The product is available in one component moisture curing and two component reaction curing types. The former offers convenient application for conventional joint sealing, while the latter is suitable for large area caulking and fast track construction scenarios.
Polysulfide Sealant
This sealant forms a dense elastic sealing body after curing, with outstanding resistance to oil, solvents and water. The product is available in one component and two component forms, with the two component type allowing on site proportioning, and performs notably well in engineering environments involving prolonged water immersion or chemical media exposure.
