They are Halon 1211 and 1301. These Halon agents are colorless, odorless, and electrically non-conductive. They are very effective, pound for pound, compared to other agents.

Six halon fire extinguishers were used to combat an overheating aft galley oven on a KLM Boeing 777-200ER, but investigators state that this was ineffective – because there was no fire – and ...