Is the injection ratio the same for “Class A” foams as for AFFF and protein type foams of 3% and 6%?
No, mixing ratios with “Class A” foams may be varied depending on the method of application or specific need, but typically the “Class A” foam concentrates mix at a rate of 0.3% to 0.6%. It is quickly noted that this is about 1/10 the rate at which “Class B” type foams must be applied. This fact shows that the logistics and economics of applying these concentrates is a very cost and manpower effective tool. Unlike the AFFF and protein type foams, which have a specific application injection ratio, the “Class A” foam may be varied depending on the rate desired. (Concentrate injection examples…0.1% to 0.3% as a wetting and penetrating agent, 0.4% to 0.6% as a moderate foaming agent, and 0.7% to 1.0% as a highly foaming agent.
No, mixing ratios with “Class A” foams may be varied depending on the method of application or specific need, but typically the “Class A” foam concentrates mix at a rate of 0.3% to 0.6%. It is quickly noted that this is about 1/10 the rate at which “Class B” type foams must be applied. This fact shows that the logistics and economics of applying these concentrates is a very cost and manpower effective tool. Unlike the AFFF and protein type foams, which have a specific application injection ratio, the “Class A” foam may be varied depending on the rate desired.
