Abstract: The present invention relates to inorganic fibres having a composition comprising: 65.7 to 70.8 wt % SiO2; 27.0 to 34.2 wt % CaO; 0.10 to 2.0 wt % MgO; and optional other components providing the balance up to 100 wt %, wherein the sum of SiO2 and CaO is greater than or equal to 97.8 wt %; and the other components, when present, comprise no more than 0.80 wt % Al2O3; and wherein the amount of MgO and other components are configured to inhibit the formation of surface crystallite grains upon heat treatment at 1100° C. for 24 hours, wherein said surface crystallite grains comprise an average crystallite size in a range of from 0.0 to 0.90 ?m.

Abstract: A process for the manufacture of inorganic fibres comprises: (a) selecting a composition and proportion of: (i) silica sand; (ii) lime comprising at least 0.10 wt % magnesia; and (iii) optional additives comprising a source of oxides or non-oxides of one or more of the lanthanides series of elements, or combinations thereof; (b) mixing the silica sand; lime; and optional additives to form a mixture; (c) melting the mixture in a furnace; and (d) shaping the molten mixture into inorganic fibres. The raw materials selection comprises composition selection and proportion selection of the raw materials to obtain an inorganic fibre composition comprising a range of from 61.0 wt % and 70.8 wt % silica; less than 2.0 wt % magnesia; less than 2.0% incidental impurities; and no more than 2.0 wt % of metal oxides and/or metal non-oxides derived from said optional additives; with calcia providing the balance up to 100 wt %; and wherein the inorganic fibre composition comprises no more than 0.

Abstract: The present invention relates to inorganic fibres having a composition comprising: 61.0 to 70.8 wt % SiO2; 28.0 to 39.0 wt % CaO; 0.10 to 0.85 wt % MgO other components, if any, providing the balance up to 100 wt %, The sum of SiO2 and CaO is greater than or equal to 98.8 wt % and the other components comprise less than 0.70 wt % Al2O3, if any.

Abstract: The present invention relates to inorganic fibres having a composition comprising: 61.0 to 70.8 wt % SiO2; 28.0 to 39.0 wt % CaO; 0.10 to 0.85 wt % MgO other components, if any, providing the balance up to 100 wt %, The sum of SiO2 and CaO is greater than or equal to 98.8 wt % and the other components comprise less than 0.70 wt % Al2O3, if any.

Abstract: The present invention relates to inorganic fibres having a composition comprising: 61.0 to 70.8 wt% SiO2; 28.0 to 39.0 wt% CaO; 0.10 to 0.85 wt% MgO other components, if any, providing the balance up to 100 wt %, The sum of SiO2 and CaO is greater than or equal to 98.8 wt % and the other components comprise less than 0.70 wt % Al2O3, if any.

Abstract: A process for the manufacture of inorganic fibres comprises: (a) selecting a composition and proportion of: (i) silica sand; (ii) lime comprising at least 0.10 wt % magnesia; and (iii) optional additives comprising a source of oxides or non-oxides of one or more of the lanthanides series of elements, or combinations thereof; (b) mixing the silica sand; lime; and optional additives to form a mixture; (c) melting the mixture in a furnace; and (d) shaping the molten mixture into inorganic fibres. The raw materials selection comprises composition selection and proportion selection of the raw materials to obtain an inorganic fibre composition comprising a range of from 61.0 wt % and 70.8 wt % silica; less than 2.0 wt % magnesia; less than 2.0% incidental impurities; and no more than 2.0 wt % of metal oxides and/or metal non-oxides derived from said optional additives; with calcia providing the balance up to 100 wt %; and wherein the inorganic fibre composition comprises no more than 0.

Abstract: The present invention relates to inorganic fibres having a composition comprising: 65.7 to 70.8 wt % SiO2; 27.0 to 34.2 wt % CaO; 0.10 to 2.0 wt % MgO; and optional other components providing the balance up to 100 wt %, wherein the sum of SiO2 and CaO is greater than or equal to 97.8 wt %; and the other components, when present, comprise no more than 0.80 wt % Al2O3; and wherein the amount of MgO and other components are configured to inhibit the formation of surface crystallite grains upon heat treatment at 1100° C. for 24 hours, wherein said surface crystallite grains comprise an average crystallite size in a range of from 0.0 to 0.90 ?m.

Abstract: A fibre mat, for example a monolith support mat or end cone insulator, the mat comprising inorganic fibres having a pressure retained value at 10 minutes at 900° C. of greater than 20 kPa; and preferably a binder. The inorganic fibres comprise X and Y and K2O, the sum of which is greater than 95 wt. % wherein X is the sum of SiO2 and ZrO2 and Y is the sum of Al2O3 and La2O3, wherein ZrO2 and La2O3 is each present in up to 10 wt. % of the total weight of the inorganic fibres.

Abstract: A fibre mat, for example a monolith support mat or end cone insulator, the mat comprising inorganic fibres having a pressure retained value at 10 minutes at 900° C. of greater than 20 kPa; and preferably a binder. The inorganic fibres comprise X and Y and K2O, the sum of which is greater than 95 wt. % wherein X is the sum of SiO2 and ZrO2 and Y is the sum of Al2O3 and La2O3, wherein ZrO2 and La2O3 is each present in up to 10 wt. % of the total weight of the inorganic fibres.