초록 ▼

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% Al2O3 0.1 to 7% Rare earth oxides +TiO2 0.5 to 16% ___________

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% Al2O3 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-oxidizing 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.

대표청구항 ▼

Alkali-resistant glass fibres for use as reinforcement in cementitious products, 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% Al2O3 0.1 to 7% Rare earth oxides +TiO2 0.5 to 16% ______________

Alkali-resistant glass fibres for use as reinforcement in cementitious products, 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% Al2O3 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.