Abstract: A moisture curable composition which is useful for sealing pavement joints consists essentially of 100 parts by weight of a hydroxyl endblocked polydiorganosiloxane, 55 to 120 parts of non-reinforcing, non-acidic filler wherein at least 40 percent by weight of the filler is treated with calcium stearate, 2.5 to 10 parts of diacetamidosilane, and 1 to 6 parts of aminoxysilicone compound. The composition is self leveling when applied to a horizontal surface and when cured has an elongation of at least 1200 percent, a durometer on the Shore OO scale of from 45 to 75 inclusive, and a modulus at 150 percent elongation of less than 50 pounds per square inch.

Abstract: A silicone emulsion having a dispersed phase of an anionically stabilized hydroxylated polydiorganosiloxane and a colloidal silica and a continuous phase of water in which the pH is 9 to 11.5 provides an elastomeric product, such as a film or coating, upon removal of the water at ambient conditions. The silicone emulsion can be prepared by adding the colloidal silica to the hydroxylated polydiorganosiloxane in an emulsified state and thereafter adjusting the pH within the range of 9 to 11.5 inclusive with such materials as an organic amine or sodium hydroxide. These emulsions are stable during storage over extended periods of time and will provide elastomeric products. A silicone emulsion can also be prepared as described except the pH is adjusted above 11.5.