Fire class

1. Fire class is a conditionally accepted characteristic of a fire object depending on the type of combustible substances and

materials
for
the
convenience of designating fire
extinguishing agents and (or)
extinguishing
agents
(fire
extinguishers, fire extinguishing
installations)
of
a
fire.
There are the following classes
and subclasses of fires:

2. Fire class - A: burning solids. Fire subclass - A1: burning of solid materials, accompanied by smoldering (for example, wood,

Fire
class
A:
burning
solids.
Fire subclass - A1: burning of solid materials, accompanied
by smoldering (for example, wood, paper, coal, textiles).
Recommended extinguishing media for subclass A1 fires:
water
with
wetting
agents,
sprayed
water;
foams, fire-extinguishing powders of ABCE type.
Fire subclass - A2: burning of solid materials, not
accompanied by smoldering (for example, rubber, rubber,
plastic).
To extinguish fires of subclass A2, all types of fire
extinguishing agents can be used: water, foam, powders,
freons.

3. Fire class - B: burning of liquid substances. Fire subclass - B1: burning of polar combustible and flammable liquids, on which

foams are intensively destroyed
(for example, alcohols, ethers, etc.).

4. Fire subclass B2: burning of non-polar flammable and flammable liquids and substances that melt when heated (for example,

gasoline, kerosene, fuel oil, oils, stearin,
some synthetic materials).
Recommended extinguishing media for subclass B2 fires:
- foam;
- mist water;
- freons;
- general purpose fire extinguishing powders;
- aerosol fire extinguishing and inert diluents: N2, CO2, etc

5. Fire class - C: combustion of gaseous combustible substances (for example: methane, hydrogen, propane). Recommended

extinguishing media
for class C fires:
volumetric quenching and
phlegmatization with gas
compositions;
general purpose fire extinguishing
powders;
foam, water (for equipment cooling).

6. Fire class - D: combustion of metals and metal-containing substances. Fire subclass - D1: burning of metals, with the exception

Fire class - D: combustion of metals and metalcontaining substances.
Fire subclass - D1: burning of metals, with the
exception of alkaline (for example, aluminum,
magnesium and their alloys).
Recommended extinguishing media for Division
D1 fires:
- powders of the PHC type;
- nitrogen;
- argon.

7. Fire subclass - D2: burning of alkali metals (for example, potassium, sodium). Special purpose fire extinguishing powders and

inert gases
can be used to extinguish fires of subclass D2.
Fire subclass - D3: combustion of solutions with a
concentration of metal-containing substances up to 60% of
the mass.
To extinguish fires of subclass D3, it is allowed to use
foams, gas compositions, fire extinguishing powders of all
kinds.

8. Fire class - E: burning of a fire object that is energized by electric current. To extinguish class E fires, it is recommended

to
use:
water, including finely dispersed;
halogen-containing products;
carbon dioxide;
aerosol fire extinguishing;
powders (when using hand-held fire
extinguishers and barrels, they are used to
extinguish equipment with voltage up to 1000 V).

9. Fire class - F: burning of nuclear materials, radioactive waste and radioactive substances.