Multi-Purpose Dry Chemical (ABC)
Extinguish your fire with an ABC Extinguisher!
ABC Fire Extinguishers use monoammonium phosphate, a dry chemical with the ability to quickly put out many different types of fires by smothering the flames.
This pale, yellow powder can put out all three classes of fire:
- Class A is for trash, wood, and paper
- Class B is for liquids and gases
- Class C is for energized electrical sources
They are definitely the most versatile as they can be used to extinguish common combustible, flammable liquid and live electrical equipment fires. Fire extinguishing capacity is rated in accordance with ANSI/UL 711: Rating and Fire Testing of Fire Extinguishers. The ratings are described using numbers preceding the class letter, such as 1-A:10-B:C. The number preceding the A multiplied by 1.25 gives the equivalent extinguishing capability in gallons of water. The number preceding the B indicates the size of fire in square feet that an ordinary user should be able to extinguish. There is no additional rating for class C, as it only indicates that the extinguishing agent will not conduct electricity, and an extinguisher will never have a rating of just C
Important facts to know regarding a fire
No one is required to put out a fire, however, if you attempt to extinguish one you need to know about fire extinguishers.
- Only attempt to put a fire out if you have a clear exit from the room.
- Do not turn your back on a fire and keep your exit from the room open and accessible at all times.
- Extinguishers will work for approximately 30 seconds.
- If you have not put the fire out in that time, leave the area immediately.
- Once you leave a burning room, do not re-enter.
- Close the door to a room with a fire.
- Leave the door unlocked as the fire department will need to enter.
- If you know the type of fire and contents of the room, please advise the Chief Fire Warden for the building or the Fire Department personnel.
- If the fire cannot be extinguishers close the door to the room that where the fire resides and depart the building pulling a pull station on the way out of the building.