DOWSIL 736 Heat Resistant Sealant

DOWSIL™ 736 Heat Resistant Sealant is supplied ready to use. Under pressure, it flows readily from its container. The paste-like consistency makes it easy to work; a spatula or wooden paddle can be used for tooling the surface. Tack-free Time The cure progresses inward from the surface when exposed to humidified air. At 77°F (25°C) and 50 percent relative humidity, the sealant forms a tack-free skin within 17 minutes. Tooling is not practical after the skin begins forming and should be completed within five minutes after application even though this may require alternate periods of applying and tooling. If masking tape is used to mark off an area, it should be removed immediately after tooling. Cure Time Cure time is affected by relative humidity, degree of confinement and cross-sectional thickness of the sealant. Sections up to 3 mm [1/8 inch] thick become rubbery solids in about 24 hours at 25°C (77°F) and 50 percent relative humidity. Less moisture content reduces the time required slightly. In 24 hours, sections up to 3 mm [1/8 inch] thick cure to a rubber.