Perimeter Solutions Solberg Re-Healing Foam RF3x6ATC 3%/6% 200 Litre Drum. Solberg Re-Healing RF3x6 ATC foam concentrate is intended for use on Class B hydrocarbon or polar solvent fuel fires. The foam can be used to prevent re-ignition of a liquid spill and control hazardous vapors. On Class A fuels, Solberg Re-Healing RF3x6 ATC foam will improve extinguishment in deep-seated fires. Foam discharge devices such as air aspirating, as well as non-air aspirating equipment, including standard sprinkler heads, can be used to obtain maximum results.