A thermal insulation product based on mineral wool, characterized in that the fibers have a micronaire of less than 10 l/min, preferably less than 7 l/min and especially between 3 and 6 l/min, and in that the material has a thermal conductivity of less than 31 mW/m.Math.K, especially less than 30 mW/m.Math.K. The parameters for obtaining this product are in particular the pressure of the burner, the rotation speed of the fiberizing spinner and the daily fiber output per spinner orifice.

A thermal insulation product based on mineral wool, characterized in that the fibers have a micronaire of less than 10 l/min, preferably less than 7 l/min and especially between 3 and 6 l/min, and in that the material has a thermal conductivity of less than 31 mW/m.Math.K, especially less than 30 mW/m.Math.K. The parameters for obtaining this product are in particular the pressure of the burner, the rotation speed of the fiberizing spinner and the daily fiber output per spinner orifice.

A mineral fiber forming device including: a centrifuge configured to rotate about a rotation axis, the centrifuge including an annular wall pierced by a plurality of orifices, the axis of symmetry of the annular wall being the rotation axis; a first annular inductor configured to heat a top part of the annular wall; a second annular inductor configured to heat a bottom part of the annular wall. The device makes it possible to increase its energy efficiency and very greatly reduce, even cancel altogether, its carbon dioxide emission level.

A mineral fiber forming device including: a centrifuge configured to rotate about a rotation axis, the centrifuge including an annular wall pierced by a plurality of orifices, the axis of symmetry of the annular wall being the rotation axis; a first annular inductor configured to heat a top part of the annular wall; a second annular inductor configured to heat a bottom part of the annular wall. The device makes it possible to increase its energy efficiency and very greatly reduce, even cancel altogether, its carbon dioxide emission level.

Mineral fibers have a chemical composition including the following constituents, as weight percentages: SiO.sub.2 30% to 50%, Al.sub.2O.sub.3 10% to 20%, CaO+MgO 20% to 35%, Na.sub.2O+K.sub.2O 1% to 10%, wherein the mineral fibers include a content of total iron, expressed as Fe.sub.2O.sub.3, of from 5% to 15% and a redox, which corresponds to the weight ratio between the content of ferrous iron, expressed as Fe.sub.2O.sub.3, and the total content of iron, expressed as Fe.sub.2O.sub.3, of less than 0.6.

A coupled-core multi-core fiber in which an inter-core distance is stabilized is manufactured. A method of manufacturing a coupled-core multi-core fiber includes forming a second cladding base material by depositing glass particulates on an outer periphery of a first cladding base material and sintering the glass particulates. The first cladding base material has a hydroxyl group concentration that is less than or equal to 10 ppb; obtaining a ground rod by grinding an outer periphery of the second cladding base material; and forming holes in the first cladding base material in the ground rod, inserting a core base material into each of the holes, and obtaining an assembly.

Provided are a method for manufacturing a fiber-reinforced resin composite, a fiber-reinforced resin composite manufactured by the manufacturing method, and a molded product, the method comprising the steps of: spinning a fiber filament; coating a surface of the fiber filament by spraying an impregnation resin emulsion onto the spun fiber filament; and forming a fiber strand by bundling the surface-coated fiber filament.

Provided are a method for manufacturing a fiber-reinforced resin composite, a fiber-reinforced resin composite manufactured by the manufacturing method, and a molded product, the method comprising the steps of: spinning a fiber filament; coating a surface of the fiber filament by spraying an impregnation resin emulsion onto the spun fiber filament; and forming a fiber strand by bundling the surface-coated fiber filament.

A thermal insulation product based on mineral wool, characterized in that the fibers have a micronaire of less than 10 l/min, preferably less than 7 l/min and especially between 3 and 6 l/min, and in that the material has a thermal conductivity of less than 31 mW/m.Math.K, especially less than 30 mW/m.Math.K. The parameters for obtaining this product are in particular the pressure of the burner, the rotation speed of the fiberizing spinner and the daily fiber output per spinner orifice.

A thermal insulation product based on mineral wool, characterized in that the fibers have a micronaire of less than 10 l/min, preferably less than 7 l/min and especially between 3 and 6 l/min, and in that the material has a thermal conductivity of less than 31 mW/m.Math.K, especially less than 30 mW/m.Math.K. The parameters for obtaining this product are in particular the pressure of the burner, the rotation speed of the fiberizing spinner and the daily fiber output per spinner orifice.