Which term describes not being susceptible to combustion to the point of flame propagation after the ignition source is removed?

• A. Fire Resistant
• B. Fireproof
• C. Flammable
• D. Nonflammable

Answer: (A)

Fire resistance is about a material’s ability to resist ignition and to prevent flame propagation once the ignition source is removed. When a material is exposed to a flame or heat, what matters for safety is whether the flame dies out after the source is gone. A fire-resistant material may resist catching fire and, crucially, will not continue to burn or spread flames after the flame is removed. The term nonflammable would imply it won’t ignite at all, which is a stricter claim and not always accurate for every material. Fireproof is a less precise everyday term and can be misleading in aviation contexts. Flammable is the opposite, meaning it catches fire easily. So the best description for the scenario is fire resistance.