OCR Text |
Show New Insulating Material. A new insulating materia1 that Is Incombustible In-combustible Is made by ir(xing 51.7 ' per rent powdered asbestos, 14 per ! cent powdered mica, 20 per cent min- eral rubber (a soft substance found in deposits of oleaginous schist), 1 per I cent rosin, 0.3 per cent pure Para rub-I rub-I her dissolved in 9.0 per cent of bisul-I bisul-I phlde of selenium being added. After f washing and evaporating in the air a hard, non-absorbent substance is ob- talned, which on heating becomes plastic and can b molded to any shape. |