초록 ▼

Man-made vitreous fibers have a solubility of pH 4.5 of at least 20 nm per day and a melt viscosity of 10 to 70 poise at 1400.degree. C. Novel fibers contain at least 18% Al2O3. Particular products include external wall insulation or cladding and pipe sections. A composition for making suitable fibr

Man-made vitreous fibers have a solubility of pH 4.5 of at least 20 nm per day and a melt viscosity of 10 to 70 poise at 1400.degree. C. Novel fibers contain at least 18% Al2O3. Particular products include external wall insulation or cladding and pipe sections. A composition for making suitable fibres may be selected by determining solubility at pH 4.5 or in macrophage.

대표청구항 ▼

1. A product comprising man-made vitreous fibres formed of a composition which includes, by weight of oxides, SiO232 to 48%Al2O318 to 30%CaO10 to 30%MgO2 to 20%FeO2 to 15%Na2O + K2O0 to 10%TiO20.5 to 6%Other Elements0 to 15%and the composition has a viscosity at 1400.degree. C. of 10 to 70 poise, an

1. A product comprising man-made vitreous fibres formed of a composition which includes, by weight of oxides, SiO232 to 48%Al2O318 to 30%CaO10 to 30%MgO2 to 20%FeO2 to 15%Na2O + K2O0 to 10%TiO20.5 to 6%Other Elements0 to 15%and the composition has a viscosity at 1400.degree. C. of 10 to 70 poise, and the fibres have a dissolution rate determined from the silica concentration in solution one day and four days after shaking the fibres in Gambles solution at pH 4.5 of at least 20 nm per day.