Compositions for high temperature fiberisation

Abstract

A composition which can be fiberized to form high quality insulation wool, and which has been formulated from naturally-occuring rock minerals such as basalts, granites, limestone, dolomite and sandstone, optionally including by-products of industrial processes such as molybdenum or steel slag and grate ash, and/or high alumina materials such as China Clay and/or boron containing minerals such as Ulexite, said composition comprising the following components, given in wt %, based on the total weight of the composition: ______________________________________ SiO.sub.2 51-68 wt % Al.sub.2 O.sub.3 5-18 wt % ______________________________________ with the total amount of SiO.sub.2 +Al.sub.2 O.sub.3 being from 62 to 75 wt %, ______________________________________ Na.sub.2 O 0-6 wt % K.sub.2 O 0-5 wt % ______________________________________ with the total amount of Na.sub.2 O+K.sub.2 O being from 0 to 7.5 wt %, ______________________________________ MgO 1-9 wt % CaO 8-20 wt % ______________________________________ with the total amount of MgO+CaO being from 12 to 27 wt %, ______________________________________ Fe.sub.2 O.sub.3 2-10 wt % TiO.sub.2 0-3 wt % P.sub.2 O.sub.5 less than 1 wt % B.sub.2 O.sub.3 0-3 wt % ______________________________________ the composition having a liquidus temperature of 1225.degree. C. or less, and a viscosity at least 1000 poise at the liquidus temperature.

Dependencies are inferred from the claim text.