Class 2 - Primary Hazards

Gases are capable of posing serious hazards due to their flammability, potential as asphyxiants, ability to oxidize, and toxicity or corrosiveness:

• Gases may be easily ignited by heat, sparks, or flame.
• Gases may form explosive mixtures with air.
• Gases may react violently when mixed with water.
• Vapors may travel to source of ignition and then flash back.
• Cylinders exposed to fire may vent and release flammable gas through pressure relief devices.
• Containers may explode when heated.
• Ruptured cylinders may rocket.
• Vapors from liquefied gases are initially heavier than air and may spread along the ground.
• Vapors may cause dizziness or asphyxiation without warning.
• Some gases may be irritating or fatal if inhaled or absorbed through the skin.
• Contact with some gases and liquefied gases may cause burns, severe injury, or frostbite.
• Fire may produce irritating, corrosive, or toxic gases.

You should never assume that a gas or vapor is harmless because of its lack of odor. Many dangerous gases are odorless. Always use caution when handling empty cylinders and receptacles because they may still contain hazardous residues.

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