5
4.1 CLASS A FOAM
Apply as needed for penetration, isolation,
cooling, and smothering.
SOLID FUEL - CLASS A
CLASS A FOAM
Recommended using Class A foam that meets USDA Forest Service “Interim Requirements for Foam for Wildland Fires,
Aircraft or Ground Application” or NFPA 298 “Foam Chemicals for Wildland Fire Control.”
Apply with low expansion nozzle for:
straight stream nozzle
- soaking and penetration of fuel
low expansion nozzle
- greater stream reach
piercing nozzle
Apply with medium expansion nozzle for:
medium expansion nozzle
- greater coverage
- longer lasting
- insulating
WILDLAND &
EXPOSURE PROTECTION
MOP UP & OVERHAUL
OPERATIONS
Apply with
MEDIUM EXPANSION
NOZZLE
for vapor suppression
Apply with
MEDIUM EXPANSION
NOZLE
for vapor suppression
4.2 CLASS B FOAM
LIQUID FUEL - CLASS B
HYDROCARBONS
Fuels that are mostly distilled from crude oil or
vegetable matter. Will not mix with water.
May apply at less than
rates for ignited. Be
capable of increasing to
ignited rates if needed.
AFFF (Aqueous Film Forming Foam)
AR (Alcohol Resistant Foam)
POLAR SOLVENTS
A flammable liquid that mixes with water. Examples
are alcoho's, amines, ethers, esters, aldehydes,
and ketones. In firefighting, any flammable liquid
which destroys regular foam is generally referred to
as a polar solvent.
UNIGNITED
UNIGNITED
Application rates:
Use foam manufacturer's
recommendations for
handheld nozzles.
AR (Alcohol Resistant Foam)
