Highly Toxic Compressed Gases

Toxic gases are those having a health hazard of 3 or 4, as defined by NFPA 704. The toxic effects of a substance can be either acute or chronic. Acute effects involve short-term, high concentrations that can cause irritation, illness, or death. Chronic effects involve continued exposure to a toxic substance over an extended period of time, resulting in serious and irreversible illness.

The quantities of highly toxic gas that can be stored and used on the floor of a building or within a control area is strictly regulated by the VSFPC, and the allowable quantities decrease for every story above ground level. 

Examples

• Arsine
• Phosphine
• Phosgene
• Nitric oxide

Precautions

• All highly toxic gases MUST be stored in a continuously, mechanically ventilated gas cabinet, fume hood, or other enclosure (unless otherwise recommended by the supplier). Please contact EHS for guidance or assistance.
  
• Review the Safety Data Sheet to determine safe use guidelines.
• Order the smallest sized cylinder you can that will support your research, and do not purchase and store spare cylinders. 
• New users should consult with EHS before ordering highly toxic gases.

Medical Gases

Compressed gases intended for inhalation or sedation (human or animal) present additional hazards. Contact Environmental, Health and Safety at 540-231-3600 for additional requirements.