METHOD OF PRODUCING FIRE-EXTINGUISHING POWDER Russian patent published in 1998 - IPC

FIELD: fire extinguishing. SUBSTANCE: sodium bicarbonate is dried to moisture content no higher than 0.3%, and nepheline concentrate is crushed to particle size at most 315 mcm. The two components (87-90 and 7.5-9 wt %, respectively) are mixed with Aerosil (2.5-4 wt %) and final product is disintegrated on shock-type mill. EFFECT: increased fire- extinguishing capacity with respect to B and C-type fires, reduced agglomeration, and increased fluidity of composition. 2 cl, 1 tbl