Class A foam extinguishing agent is non-toxic, non-corrosive, biodegradable environmentally friendly concentrate, according to the proportion of 0.1%, in the domestic production of any of various types of vehicles and other Class A foam with a compressed air systems using a variety of devices. (1) fire-fighting principles and characteristics of the foam fire extinguishing agent has control speed, high water use efficiency, thermal insulation, wall for a long time, the resurgence of anti-significant effect, etc., can greatly reduce the fire scene flood losses. The plump foam fire extinguishing agent, fine, good durability, high moisture content, the top surface of the building can even room can form a thick foam layer in the vertical and the surface from different angles, in a water film formed on the surface of combustion heat layer, stable and lasting foam, water balance analysis, and because of fire extinguishing agent with good wetting permeability, can penetrate deep into the gap of solid combustion products, and extinguish smoldering flame, do not completely extinguishing resurgence, so the product with a foam stability, high extinguishing efficiency, good anti-resurgence effect, is the ideal product is currently a Class A fire extinguishing. (2) is widely used to fight the blaze including rubber, coal, paper, building materials and other types of fires Class A Class B Class C Class E and general electrical initial fire. (3) Performance Indicators Project Technical Requirements Q / IKUT 11-2009 Appearance light yellow liquid freezing point, ℃ ≤-10 ℃ anti-freeze, thaw resistance no visible stratification and heterogeneous sediments, former% (volume fraction) aging ≤ 0.25; precipitate can over 180um sieve after aging ≤1.0; precipitate over 180um sieve can PH value of 6.0 to 9.5 expansion ratio ≥5.0 25% dialysate time / s ≥60 1% solution of the wetting ability of the foam (20 ℃) , s ≤40.0 fire performance ≥IA