REFRACTORY FIBER COMPOSITION AND INTERMEDIATE TEMPERATURE RANGE FIBROUS INSULATION COMPOSED THEREOF

摘要

REFRACTORY FIBER COMPOSITION AND INTERMEDIATE TEMPERATURE RANGE FIBROUS INSULATION COMPOSED THEREOF Refractory fiber compositions are disclosed comprising 84% to 97% by weight total silica and alumina, with the silica-to-alumina weight ratio being in the range of 3:2 to 1:1, preferably approximately 5:4, and 3% to 16% by weight of a dolomitic component comprising calcium oxide and magnesium oxide. The dolomitic component may be composed of burnt dolomite or lime and magnesia. The fibers made of these compositions are suitable for thermal insulaation use at temperatures in the range of from 1400.degree.F to 2000.degree.F(760.degree.C to 1100.degree.C) and find particular use as insulating mats and blankets for furnaces, kilns and automobile catalytic mufflers.