Saline soluble inorganic fibres

摘要

A use is disclosed comprising the repeated exposure to temperatures of 1000 DEG C or more of refractory insulation comprising saline soluble fibres having a shrinkage as specified of less than 3.5% when exposed to 1000 DEG C for 24 hours and having a shrinkage as specified of less than 3.5% when exposed to 800 DEG C for 24 hours, the saline soluble fibres comprising vitreous fibres comprising SiO2 and either one or both of CaO or MgO and having a composition comprising (in weight %):- <TABLE> and being essentially free of fluxing components such as alkali metal oxides and boron oxide. <IMAGE>