Abstract: A method for sheet forming a remarkably waterproof gypsum hardened body, in which a main component consisting of gypsum dihydrate, slag and calcium hydroxide and additives are added with a part of the main component coated with a hydrophobic diorganopolysiloxane fluid having a kinetic viscosity of 10-10,000 CS at 25.degree. to be sheet formed and cured. The hydrophobic diorganopolysiloxane fluid is uniformly dispersed through the sheet formed gypsum hardened body and its strong water repelling property makes the gypsum hardened body remarkably waterproof to be used suitably as both interior and outdoor construction materials.
Type:
Grant
Filed:
March 12, 1982
Date of Patent:
October 25, 1983
Assignees:
Mitsubishi Mining & Cement Company Ltd., Mitsubishi Cement Asbestos Company Ltd., Toray Silicone Company Ltd.
Abstract: A steel cord for the reinforcement of elastomer material. comprising two equivalent wire groups of at least two wires each, the wire groups being twisted around each other, in which the wires of the first group are parallel or nearly parallel, and the wires of the second group are twisted around each other with a twist pitch of the same sense and the same value as the twist pitch with which the two groups are twisted together.