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Boss PU 25 is a fast-curing one-component polyurethane sealant that turns into a flexible, durable and resistant elastomeric seam and has a very good adhesion to most industrial materials. Boss PU 50 has high elasticity and excellent tear, vibration and weathering resistance. Easy to apply, it adheres without primer to the most common substrates such as glass, anodized aluminum, lacquered metal, wood, FRP and concrete. Specifications of Boss PU 50 Polyurethane Sealant meets or exceeds the following: TT-S-00230C9(Type ll) Class A ASTM C-920 Type S Grade NS Class 25, Use-NT, A and M Typical Properties: Specific Gravity 1.2-1.3 Skin formation time 40mins Curing speed 4mm per 24 hours Shore hardness Approx.50 Elongation at break >700% Tensile Strength 2.3N/mm2 Tear Strength 8N/mm2 Color Black, Grey & White Features: Primer less adhesion to most substrates Excellent weather ability Paintable Tools Easily