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Dry Chemical Agents

Our full line of CHEMGUARD Class A, Class B, and Class C dry chemical delivers excellent, consistent fire suppression performance. CHEMGUARD Purple-K firefighting dry chemical is compatible with most foam concentrates for twin-agent application. CHEMGUARD dry chemicals are intended for use in the hardware in which it has been designed and tested, from small extinguishers to large mobile units and fixed installations.

Different types of CHEMGUARD dry chemicals suppress different types of fires. The different type of fire classifications per NFPA standards are:

  • Class A - Fires in ordinary combustible materials such as wood, cloth, paper, rubber and many plastics.
  • Class B - Fires in flammable liquids, oils, greases, tars, oil based paints, lacquers, etc., and flammable gases.
  • Class C - Fires involving “live” electrical equipment where the use of a non-conducting fire agent is required.
  • Class D - Fires involving combustible metals and their alloys such as magnesium, sodium, potassium, lithium, titanium, etc.

Fire tests on flammable liquids have shown potassium bicarbonate based dry chemical to be more effective than sodium bicarbonate based dry chemical. Similarly, the monoammonium phosphate based dry chemical has been found equal to or better than the sodium bicarbonate based chemical.

"Multi-Purpose" (ABC) monoammonium phosphate based dry chemical agent is yellow in color. This agent is suitable for use on Class A, B or C type fires and is particularly effective on combination fires.

"Regular or Standard" (BC) dry chemical refers to an agent that is suitable for use on either Class B or C type fires. These agents are sodium bicarbonate based and blue in color.

Purple K (PK) dry chemical agent is based on potassium bicarbonate. Because of its fast extinguishment properties on flammable liquid fires, it is typically used in high hazard risk areas such as refineries, chemical plants or airports. The color of PK agent is purple.

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