Patent ID: 6133371
Filing Date: 2000-10-17
Classification: C08G,C09K

Abstract:
A sealant for forming a fluid seal between the faying surface of two metallic substrates that are compressively and mechanically joined together, said sealant being liquid in its pre-cured condition and a dry solid in its cured condition, the transition from pre-cured to cured condition occurring at room temperature with a cure time not less than about 10 minutes and not more than about 16 hours, said sealant when cured having a Shore A hardness between about 30 an about 70, being impermeable and resistant to chemical attack by air, water, common solvents and petroleum fuels, resistant to compressive cold flow but deformable to conform to an abutting one of said surfaces or with a layer of similar sealant on the other of said surfaces, and flexible and resistant to a temperature range between about -65 degrees F. and about 250 degrees F., said sealant formed by curing a mixture containing an isocyanate having at least two functionalities, a polyol having at least two functionalities, and between about 1% and 50% barium chromate, strontium chromate or zinc chromate by weight of the sealant.