Which foam extinguishing agent can be proportioned into final concentrations of 1%, 3%, and 6%?

Aqueous film-forming agents (AFFF) are synthetic foam concentrates that can be proportioned into final concentrations of 1%, 3%, and 6%, depending on the type of fuel and application method12. AFFF forms a thin aqueous film on the surface of the flammable liquid, which prevents vapor release and provides rapid fire knockdown and extinguishment3. AFFF is suitable for Class B fires involving hydrocarbon fuels such as gasoline, diesel, kerosene, etc. References:

Fire Fighting Foams - Chemguard

Extinguishing foam: types, operation and application areas

[NFPA 11: Standard for Low-, Medium-, and High-Expansion Foam]