| 摘要 |
1,191,771. Asbestos paper. SIEMENS A.G. 5 March, 1968 [18 March, 1967], No. 10731/68. Heading D2B. A porous asbestos member is made by treating asbestos fibres with a caustic alkali solution in the absence or substantial absence of a binding agent, shaping and heating to a temperature in the range from 300 to 700‹C. The caustic alkali may be a hydroxide of an alkali metal or of an alkaline-earth metal. If an alkali has been used in the refining of the asbestos, it need not be completely washed out and no further addition of alkali is needed. The fibres may be slurried in water and formed into a paper sheet. The product may be used as a membrane in a fuel element or as a diaphragm in an electrolyser or an accumulator. |
