UltraTech Ultra repair epoxy putty tackles the toughest repair jobs. Adheres to steel, glass, masonry and most plastics. A quick and effective solution to cracks, broken seals and leaks. Simply pinch off the amount desired, knead to a uniform gray and press into place. Hardens like steel in only one hour. Storage Conditions: Exothermic reaction at 123 degree F (51 degree C). Unaffected by cold. Best used when arm. Shelf life: several years if stored in original tube with cap on. Physical Properties : Density: 15-4/5 lbs/gallon. Modulus of elasticity: 6 x 10 (5) psi. Hardness (shore D): 85. 18000 psi compression strength. 700 psi shear strength. Temperature : (intermittent): 300 degree F (149 degree C). 6000 psi tensile strength. 3 feet-lbs/in of notch. Temperature (Continuous): 250 degree F (121 degree C). Measures 7/8-inches diameter by 7-inches length.