Which hazard label would apply to a gas cylinder under pressure that does not ignite easily?

Which hazard label would apply to a gas cylinder under pressure that does not ignite easily?

• A. Non-flammable compressed gas
• B. Explosive
• C. Radioactive substance
• D. Spontaneously Combustible

Answer: (A)

Gas cylinders are labeled by the flammability of the gas inside, not by the fact they’re under pressure. If the gas itself does not ignite easily in air, it is classified as a non-flammable gas, so the appropriate label is non-flammable compressed gas. The other options describe different hazards—explosive would apply to gases that can detonate or explode, radioactive substances to materials that emit radiation, and spontaneously combustible to materials that ignite on contact with air without an ignition source. So the correct label clearly reflects that the gas isn’t easily ignited, even though the cylinder is under high pressure.

Gas cylinders are labeled by the flammability of the gas inside, not by the fact they’re under pressure. If the gas itself does not ignite easily in air, it is classified as a non-flammable gas, so the appropriate label is non-flammable compressed gas. The other options describe different hazards—explosive would apply to gases that can detonate or explode, radioactive substances to materials that emit radiation, and spontaneously combustible to materials that ignite on contact with air without an ignition source. So the correct label clearly reflects that the gas isn’t easily ignited, even though the cylinder is under high pressure.