Nonhazardous pumpable refractory insulating composition.

摘要

A pumpable refractory insulating compsn. contg. a dry component which comprises: a) 10-80 wt.% of a nonhazardous low-density refractory insulating material having a density of 7-50 lb./ft.3, 30-60 wt.% alumina and 40-60 wt.% silica. b) 20-90 wt.% of a high-density refractory material having a density of at least 150 lb./ft3, and c) a binder component comprising 20-80 parts by wt. of aq. colloidal silica based on the wt. of the dry component in the refractory, thereby providing 5-50 parts by wt. colloidal silica solids per 100 parts by wt. of the dry component, where the overall density of the dry component is 40-130 lb./ft3.