Fireproof heat insulating material - comprising amorphous silicon di:oxide filler, mineral wool and small proportion of binder

摘要

Fireproof, heat circulating material comprises, as filler 40 wt.% X-ray amorphous SiO2 powder (I) and mineral wool (60% with 1% binder). (I) has the following analysis: 82-95% X-ray amorphous SiO2 powder; 5-18% crystalline quartz; 2.5% Fe2O3, CaO MgO and C. It has bulk density 0.25-0.50g/ml. 95% of the filler has particle size 50 mu.