Applicable Base Polymer Properties
Polyurethanes are extensively and successfully used as adhesives and sealants, and they have an excellent record of durability. Construction sealants based on hybrid polyurethane and silicone polymers, such as silyl terminated polyurethane (SPUR), have better weathering characteristics than conventional polyurethane sealants, but without the odor and unpaintability problems of conventional silicone sealants. They also provide better adhesion, abrasion resistance and low temperature extrudability than silicone sealants. The silyl terminated sealant systems are also isocyanate- and solvent-free systems.