Abstract: The properties of mineral fibres comprising silicon, magnesium, calcium, iron, aluminium and oxygen atoms are improved by exposure to a heat treatment under oxidising conditions which causes migration of MgO, thereby creating an outer layer with increased concentrations of MgO. Batts and other fibrous products containing the fibres have increased resistance to shrinkage and sintering.

Abstract: 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° C. Novel fibers contain at least 18% Al2O3. Particular products include external wall insulation or cladding and pipe sections. A composition for making suitable fibers may be selected by determining solubility at pH 4.5 or in macrophage.

Abstract: Rock fibres are made from a melt formed from a blend of low and high halogen waste materials. 80 to 98% are low halogen materials (containing less than 0.5 wt. % halogen) and 2 to 20% are high halogen materials (containing at least 1 wt. % halogen).

Abstract: Mineral fiber products, in particular rigid bonded mineral fiber products, are provided which comprise composite mineral fibers having a coating-core configuration wherein the core provides at least 90% by weight of the fibers and is formed of mineral melt and the coating is coated onto the core. The mineral melt is chosen so that the fibers without coating have adequate biological solubility and the coating comprises a phosphate or hydrogen phosphate of alkali metal, quaternary ammonium or ammonium in an amount of at least 0.3% or by weight of the core. The coated fibers retain their biological solubility while improving resistance to ageing in use.

Abstract: 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° C. Novel fibers contain at least 18% Al2O3. Particular products include external wall insulation or cladding and pipe sections. A composition for making suitable fibers may be selected by determining solubility at pH 4.5 or in macrophage.

Abstract: 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° 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.

Abstract: 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° 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.

Abstract: 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.

Abstract: Man-made vitreous fibres has 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. and are formed from a composition which includes 18 to 30% by weight Al.sub.2 O.sub.3.

Abstract: 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.

Abstract: The production and physiological dissolution rate of mineral wool formed of MMV fibers containing 35-66% SiO.sub.2, up to 10% A1.sub.2 O.sub.3, 10-45% CaO, 2-30% MgO, up to 10% FeO, 0-7% Na.sub.2 O+K.sub.2 O and 0-10% TiO.sub.2 is improved by including both P.sub.2 O.sub.5 and B.sub.2 O.sub.3 in the composition.