Alkali resistant glass fibres and cementitious products...

Details Alkali resistant glass fibres and cementitious products... Alkali resistant glass fibres and cementitious products...

C - Chemistry, Metallurgy

03

C

261/14

C03C 13/00 (2006.01)

Patent

CA 1152113

ABSTRACT OF THE DISCLOSURE Alkali-resistant glass fibres for use as reinforcement in cementitious products are formed from a composition comprising, in weight percentages: SiO2 55 to 75% R2O 11 to 23% ZrO2 6 to 22% Cr2O3 0.1 to 1% A12O3 0.1 to 7% Rare earth oxides + TiO2 0.5 to 16% where R2O is any one or more of Na2O, K2O or Li2O, the content of TiO2 does not exceed 10%, and the total of the components recited above amounts to at least 88% by weight of the glass, the glass having been melted under non-oxidising conditions such that all or a substantial proportion of the chromium in the glass is in the trivalent state. Cementitious products incorporating such fibres, e.g. in a proportion of 3 to 6 weight %, can be made using a Magnani-type asbestos cement machine or by a "spray-up" method.

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