The Three Bond 1211V is a free flowing, low viscosity, one compound RTV silicone rubber. Three Bond 1211 is ideal for vacuum places where long, faultless seal is critical. Recommended for sealing vacuum flange surfaces and screw sections inside vacuum pumps to prevent vacuum, oil, water, and chemical leaks. Three Bond 1211 is effective over a wide temperature range, -76 degrees F to 482 degrees F. Tack free in 90 minutes; fully cured in 24 hours. Quanity 3.5 oz. tube.