Improved Manufacture of Non-conducting Coverings, Blocks and Slabs suitable for Covering Steam Pipes, Boilers and the like and for other purposes.

摘要

21,386. Michell, H. C. Oct. 1. Slabs; facing-blocks.-Relates to non-conducting coverings, blocks, and slabs, composed of, or containing flakes or particles of mica and a silicious binding-agent, such as sodium silicate, clays, or the like, with or without the addition of light porous or open filling, of the kind mentioned in Specification No. 4970, A.D. 1901 and used for covering steam pipes, boilers, refrigerator pipes, and for other purposes. These coverings, blocks, and slabs, after being moulded to shape and dried, are subjected to a high temperature, in order that the sodium silicate may combine with the mica and form a compound silicate with it. In this way, a durable outer crust or shell is formed, which will resist the action of air, steam, and water. The heating may be effected by firing in a kiln at a temperature up to, or about, 1000‹ C. The interior of the coverings &c. may be charged with non- conducting material of various kinds, other than mica and light porons or other material referred to in the prior Specification ; or the coverings &c. may be formed of an intimate mixture of mica, filling-material, a binding-agent, and a non-hygroscopic substance, moulded to shape as described in the prior Specification. In some cases, refractory fibrous material, such as asbestos, may be added to the mica and the binding-agent.