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Title: 01/25/1995 - Guidance on whether an inert gas in the non-compressed state represent hazardouschemicals under the Hazard Communication Standard.
Richard F. Andree, CSP, PE, Ph.D. Vice President - Director of Safety and Health Services Lovell Safety Management Company, Inc. 161 William Street New York, New York 10038-2675
OSHA agrees with your statement that inert gases are classified as a simple asphyxiants. Patty's Industrial Hygiene and Toxicology defines a simple asphyxiant as: "physiologically inert gases that can act principally by dilution of the atmospheric oxygen below partial pressure necessary to maintain an oxygen saturation in the blood sufficient for normal tissue respiration."
Inert gases, such as argon, nitrogen and helium, have the potential to create a hazardous atmosphere (less than 19.5% oxygen) and, where that potential exists, are considered by OSHA as hazardouschemicals presenting an acute health hazard and covered by the standard. The HCS would not apply where employees are not occupationally exposed, under normal conditions of use or in a reasonably foreseeable emergency, to the oxygen displacing hazard associated with inert gases. Obviously, argon, nitrogen and helium occur naturally in the atmosphere, and under those conditions they are not hazardous chemicals.
The HCS requires chemicalmanufacturers, or importers to assess the hazards of chemicals which they produce or import, and all employers to provide information to their employees about the hazardouschemicals to which they are exposed, by means of a hazard communication program, labels and other forms of warning, material data safety sheets (MSDSs), and information and training. Included in the HCS is paragraph (c) which contains a broad definition of the term "health hazard." Appendix A of the HCS also provides further definition and explanations of the scope of health hazards including acute health hazards. Enclosed for your reference is a copy of a February 9, Hazard Communication; Final Rule which contains a number of minor changes and technical amendments to clarify further the regulatory requirements.
You objected to the language in the March 4, 1993, letter to Matthew McFarland stating that toxicity has been established in inert gases, and that the manufacturer, importer, and/or distributor has the duty of performing a complete hazard determination. To elaborate on the underlined phrase we mean the toxic effects of excessive levels of inert bases has been well established. Hopefully, this clarifies the language and addresses your concern.
We hope this information provides you with the necessary guidance. Thank you for your interest in worker safety and health. Should you require additional information please contact the Office of Health Compliance Assistance at (202) 219-8036.
Sincerely,
Joseph A. Dear Assistant Secretary
The original official public domain version of this document is available from OSHA at XXXOSHAURL.