Which Halon has primarily been used in the defence, industrial, marine and aviation sector in some countries?

• A. Halon 1211
• B. Halon 1301
• C. Halon 2402
• D. Halon 1311

Answer: (C)

The question focuses on how certain Halons were chosen for specialized, high-risk environments because of how they work in enclosed spaces and around sensitive equipment. Halon 2402 was widely used in portable extinguishers and small fixed systems in defense, industrial, marine, and aviation settings in some countries. Its effectiveness in quickly suppressing fires, especially electrical and electronic fires, combined with leaving minimal residue and being suitable for confined compartments on ships and aircraft, made it a preferred option in those sectors.

In contrast, other Halons have different typical roles: some are more common in fixed total-flooding systems in aircraft or ships, while others are used in broader portable extinguisher applications. Over time, all Halons have faced phase-out pressures due to environmental concerns, but Halon 2402 is the one most closely associated with those particular sectors in certain contexts.