C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 14/26 (2006.01) C04B 14/10 (2006.01) C04B 14/20 (2006.01) C04B 14/30 (2006.01) C04B 14/42 (2006.01) C04B 22/00 (2006.01) C04B 28/14 (2006.01)
Patent
CA 2418235
The invention concerns a gypsum plaster base board composition comprising: 55 to 92 % of calcium sulphate capable of being hydrated; 0.1 to 5 % of mineral and/or refractory fibres: 3 to 25 % of a mineral additive; 1 to 5 % of non- exfoliated vermiculite; 3 to 15 % of hydrated alumina. The invention also concerns a method for preparing said composition and a method for making gypsum plaster base boards. Said gypsum plaster base boards have improved fire resistance.
La présente invention concerne une composition pour plaque de plâtre comprenant: de 55 à 92% de sulfate de calcium hydratable; de 0,1 à 5% de fibres minérales et/ou réfractaires; de 3 à 25% d'un additif minéral; de 1 à 5% de vermiculite non expansée; de 3 à 15% d'alumine hydratée. L'invention concerne également un procédé de préparation de cette composition ainsi qu'un procédé de fabrication de plaques de plâtre. Ces plaques de plâtre ont une résistance au feu améliorée.
Gowling Lafleur Henderson Llp
Lafarge Platres
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