초록

Man-made vitreous fibers have a solubility at pH 4.5 of at least 20 nm per day, a liquidus temperature of below 1300.degree. C., a viscosity at the liquidus temperature of about 300 poise, and a composition which includes at least 15% by weight Al.sub.2 O.sub.3.

대표청구항 ▼

[ What is claimed is:] [1.] A product comprising man-made vitreous fibres formed of a composition which includes, by weight of oxides,______________________________________ SiO.sub.2 36 to 55% Al.sub.2 O.sub.3 15 to 30% CaO 3 to 30% MgO 5 to 20% FeO 4 to 15% Na.sub.2 O + K.sub.2 O 1 to 12% TiO.sub.2

[ What is claimed is:] [1.] A product comprising man-made vitreous fibres formed of a composition which includes, by weight of oxides,______________________________________ SiO.sub.2 36 to 55% Al.sub.2 O.sub.3 15 to 30% CaO 3 to 30% MgO 5 to 20% FeO 4 to 15% Na.sub.2 O + K.sub.2 O 1 to 12% TiO.sub.2 0 to 6% Other Elements 0 to 15% ______________________________________and in which the ratio Si.sup.4+ to Si.sup.4+ +Al.sup.3+ is below 0.67and the composition has a viscosity at the liquidus temperature of above 300 poise and a liquidus temperature below 1300.degree. C.and the fibres have a dissolution rate of at least 20 nm per day when measured at a pH of 4.5.