3M Polyurethane sealant 540 is a one component, moisture curing products which form permanently elastic bonds. Excellent sealer and paintable. Bonds to a wide variety of materials including plastics, FRP, SMC, aluminum, steel, coated metal, and wood. Smoke and flame rated, 90 minute skin time. Construction, general industrial and transportation. Sealing, caulking, waterproofing and damping. Application Method: hand or pressure caulk. Brand: 3M. Capabilities: sustainability. Color: white. Consistency: medium paste. Container volume: 5 gallon (US). Cure rate: Greater than 3 mm/24 hr. Elongation: 600 percent. Hardness: 40 shore A. Industry - use: construction, general industrial, specialty vehicle, transportation. Modulus at 100 percent: 58 pound-force per square inch. Product form: gallon. Skin time: 60 - 90 minute. Solids weight percent (approximate): 90 percent. Tack free time: 1 hour. Tensile strength: 250 psi. Volatile organic compounds (vocs): 53.7 grams per litre.