For use on Class B fuel fires: 3% concentrate on hydrocarbon fuels such as gasoline, fuel oil, etc. and 6% on polar solvent (water miscible) fuels such as methyl alcohol, acetone, MTBE, etc. Aspirated or non aspirated discharge devices. 3% or 6% solution in fresh, salt or hard water. 3% or 6% premix in fresh or potable water. UL Listed and FM Approved. 20-25 year shelf life