CHEMGUARD CLASS A PLUS(CAP) foam concentrate is a low-, medium-, and high-expansion Class A fire control foam concentrate formulated from specialty hydrocarbon surfactants, stabilizers, and solvents. CLASS A PLUS foam solution is effective on many deep-seated Class A fires such as tire, paper, coal, and structure fires.
CLASS A PLUS foam concentrate can be proportioned from 0.1% to 1.0% in fresh, brackish, or sea water. Because of the extremely low proportioning rate, the foam concentrate offers outstanding economy in concentrate storage space, cost (compared to conventional 3% and 6% foam agents), and product transport requirements. For example, a 5-gal (19 L) pail of foam concentrate produces 500 gal (1,893 L) of fire control foam solution at 1% concentration and produces 5,000 gal (18,927 L) of foam solution at 0.1% concentration.
Fire suppression mechanisms and characteristics in effect when using CLASS A PLUS foam concentrate include:
Reduction of the surface tension of water, which provides superior wetting and char penetrating characteristics. This enhancement helps reduce combustibility of Class A fuels and control deep seated fires.
Extended drain time which increases the duration of surface wetting, reducing the risk of ignition/re-ignition.
Creation of a dense foam blanket which provides an insulating barrier between the fuel and air.
Suppression of combustible vapors while cooling the fuel.
Formation of a brilliant white foam that reflects heat.
High viscosity which allows the foam to cling to vertical surfaces for increased protection.
Designed for fire suppression of Class A fuel fires
Effective application with aspirating and non-aspirating discharge devices, compressed air foam systems (CAFS), or dropped from rotary wing aircraft
CLASS A PLUS foam concentrate is designed for fire suppression use on Class A fuel fires including wood, paper, coal, and rubber fires. Although designed for Class A fires, the foam solution may be effective on some, contained Class B flammable liquid fires in emergency response situations when applied by portable medium- or high-expansion devices.
CLASS A PLUS foam concentrate can be used with aspirating and non-aspirating discharge devices, compressed air foam systems (CAFS), or dropped from rotary wing aircraft. Applicable suppression mechanisms and some foam solution properties may vary with the type of foam delivery device used.
The recommended operational temperature range for CLASS A PLUS foam concentrate is 32 °F to 120 °F (0 °C to 49 °C). It can be correctly proportioned using most conventional, properly calibrated, proportioning equipment such as:
Compressed air foam systems (CAFS)
Around-the-pump type proportioners
Fixed or portable in-line venturi type proportioners
Handline nozzles with fixed eductor/pick-up tubes
At a given proportioning rate, the foam expansion may vary with the type of discharge device used.
For immediate use: The concentrate may be diluted with fresh or sea water for use as a pre-mix solution.
For delayed use: Long-term storage as a pre-mix solution is not recommended.
CLASS A PLUS foam concentrate is available in pails, drums, totes, or bulk shipment.