ABC Dry Chemical

Chemguard ABC dry chemical is a multipurpose, monoammoniumphosphate based, dry chemical powder that is treated with flow promoting andmoisture repellent additives during manufacturing. ABC dry chemical is suitablefor use as a recharge agent in most manufacturers' fire extinguishers thatutilize monoammonium phosphate based dry chemical powder. It is very effectiveon fires involving ordinary combustible materials such as wood, paper, cotton,rubber, many types of plastics as well as fires involving flammable liquids andenergized electrical equipment.  Because of its versatility, ABC is mostsuitable for use on combination fires involving Class A, B or C type firestogether. Chemguard ABC is typically yellow in color, which differentiates itfrom the other dry chemical powders.

EXTINGUISHING MECHANISM

When Chemguard ABC dry chemical powder is introduced directlyinto the fire area of a Class B type fire, it causes the fire to go out byinterfering with the chemical chain reaction of combustion.  When the ABCpowder is applied to a Class A type fire, the particles fuse and swell up toform a barrier (coating) that eliminates oxygen and thereby completes theextinguishing process and prevents reignition. 

FOAM COMPATIBILITY

All Chemguard dry chemical powders are considered foamcompatible when used in conjunction with foam solutions generated by Chemguardmanufactured foam concentrates such as AFFF, AR-AFFF, High Expansion, Trainingfoams and Class “A” foams.

LIMITATIONS

Per NFPA Standard 10 Portable Fire Extinguishers, Chemguard doesnot recommend ABC dry chemical powder is used on fires involving cooking greaseor vegetable oils. Suitable agents for these type fires are either sodiumbicarbonate or potassium bicarbonate based powders.

STORAGE

Chemguard dry chemical powders are formulated so that they arenot affected by long-term storage.  As a general guide all powders arestable at low temperatures down to -60ºF (-54ºC), with an upper storage limitof 120ºF (49ºC).

CAUTION

Never mix monoammonium phosphate based fire-extinguishing agentswith bicarbonate-based agents in any fire extinguisher due to a chemicalreaction that may occur