초록 ▼

Man-made vitreous fibres have a solubility at pH 4.5 of at least 20 nm per day and a melt viscosity of 10-70 poise at 1,400.degree. C. A composition which will provide these properties is selected for their manufacture and contains at least 10% by weight Al.sub.2 O.sub.3. Novel fibres contain at lea

Man-made vitreous fibres have a solubility at pH 4.5 of at least 20 nm per day and a melt viscosity of 10-70 poise at 1,400.degree. C. A composition which will provide these properties is selected for their manufacture and contains at least 10% by weight Al.sub.2 O.sub.3. Novel fibres contain at least 6% by weight Na.sub.2 O +K.sub.2 O.

대표청구항 ▼

[ What is claimed is:] [1.] A method of making man-made vitreous fibre product comprising selecting a mineral melt composition which has a viscosity at 1400.degree. C. of 10 to 70 poise at a pH in the range 4-5 and provides fibres which have a dissolution rate of at least 20 nm per day when measured

[ What is claimed is:] [1.] A method of making man-made vitreous fibre product comprising selecting a mineral melt composition which has a viscosity at 1400.degree. C. of 10 to 70 poise at a pH in the range 4-5 and provides fibres which have a dissolution rate of at least 20 nm per day when measured at a pH of 4.5 and a sintering temperature of at least 800.degree. C. and which includes, by weight of oxides,______________________________________ SiO.sub.2 32 to 48% Al.sub.2 O.sub.3 12 to 30% CaO 10 to 28% MgO 2 to 20% FeO 2 to 15% Na.sub.2 O + K.sub.2 O 0 to 12% TiO.sub.2 0 to 4% Other Elements 0 to 8% ______________________________________ forming the man-made vitreous fibres from the selected composition.