Man-made vitreous fibres
AssigneeRockwool International A/S
InventorsSoren Lund Jensen, Vermund Rust Christensen, Marianne Guldberg
Life of this patent
Estimating the term…
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.
Claims24
A product comprising man-made vitreous fibres formed of a composition which includes, by weight of oxides,
- SiO2 32 to 48% Al2O3 18 to 30% CaO 10 to 30% MgO 2 to 20% FeO 2 to 15% Na2O + K2O 0 to 10% TiO2 0.5 to 6% Other Elements 0 to 15%
- and the composition has a viscosity at 1400° 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.
A method of making man-made vitreous fibre products comprising selecting a composition in the form of a mineral melt and forming fibres from the melt wherein
- a melt viscosity and a fibre dissolution rate in the presence of macrophages are determined for the composition and
- a composition is selected which has a viscosity at 1400° C. of 10 to 70 poise and which provides fibres which 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, and which includes, by weight of oxides,
- SiO2 32 to 48% Al2O3 10 to 30% CaO 10 to 30% MgO 2 to 20% FeO 2 to 15% Na2O + K2O 0 to 12% TiO2 0 to 6% Other Elements 0 to 15%
- and vitreous fibres are made from the selected composition.
A package containing a man-made vitreous fibre product wherein the fibres are formed of a composition having an analysis, as oxides, which includes
- SiO2 32 to 48% Al2O3 10 to 30% CaO 10 to 30% MgO 2 to 20% FeO 2 to 15% Na2O + K2O 0 to 12% TiO2 0 to 6% Other Elements 0 to 15%
- and the composition has a viscosity at 1400° 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 at least 20 nm per day,
- and the package includes a label or insert referring to solubility at pH 4 to 5 and/or in environment created by macrophages in lung fluid.
A product comprising man-made vitreous fibres formed of a composition having an analysis, as oxides, which includes
- SiO2 32 to 48% Al2O3 10 to 18% CaO 10 to 30% MgO 2 to 20% FeO 2 to 15% Na2O + K2O 6 to 12% TiO2 0 to 6% Other Elements 0 to 15%
- and the composition has a viscosity at 1400° 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.
Vitreous fibres which are biologically acceptable utilising fibres of a composition which includes, by weight of oxides,
- SiO2 32 to 48% Al2O3 12 to 30% CaO 10 to 28% MgO 2 to 20% FeO 2 to 15% Na2O + K2O 0 to 12% TiO2 0 to 4% Other Elements 0 to 8%
- which has a viscosity at 1400° C. of 10 to 70 poise and which provides fibres which 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.
Dependencies are inferred from the claim text.