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Formaldehyde concentration under process safety management

Summary A chemical company asked what formaldehyde concentration OSHA meant in the process safety management rule's Appendix A. OSHA said the listing should read formaldehyde at 37 percent by weight or greater, and that mixtures below that concentration in solution were outside the rule. OSHA said it planned to revise the standard; this archived page may no longer state current policy.
Document
Federal opinion letter
Agency
Occupational Safety and Health Administration (OSHA)
Document number
1992-07-28-2
Date issued
July 28, 1992
Status
Archived by the agency
OSHA marks this page as an archive document and says it may no longer represent OSHA policy.
Status last verified October 9, 2026

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NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. It is presented here as historical content, for research and review purposes only.

July 28, 1992

Mr. Cary Franklin
Senior Process/Project Engineer
Georgia Pacific Resins, Inc.
[Recipient address omitted]
Dear Mr. Franklin:

This is in response to your letter of June 24, regarding the Final Rule on Process Safety Management (PSM) of Highly Hazardous Chemicals published in Volume 57, Number 36 of the Federal Register on Monday, February 24, 1992.

In your letter you requested written clarification on what is meant by "Formaldehyde (Formalin)" listed in Appendix A of the PSM standard. This highly hazardous chemical should be listed to read: Formaldehyde (37% by weight or greater). The PSM standard will be revised to reflect this change in the near future. Any amount of mixture of Formaldehyde, less than 37% by weight, in solution would not be covered by the PSM standard.

Presently, the Occupational Safety and Health Administration is developing a directive which will provide interpretative guidance and inspection procedures to our field staff. When the directive is completed in the near future, we will send you a copy to assist you in your stated direction to continue efforts towards employer compliance with the PSM standard.

Thank you for your interest in occupational safety and health. If we may be of further assistance, please contact us.

Sincerely,
Patricia K. Clark, Director
Directorate of Compliance Programs

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