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Spray-finishing rules and water-based materials

Summary An OSHA regional office asked when spray-finishing rules cited by the ventilation standard apply. OSHA said the flammable-material provisions apply when flammable or combustible finishes are sprayed. Water-based products could still leave combustible residues after evaporation, calling for the cited residue safeguards or potential general-duty enforcement.
Document
Federal guidance
Agency
Occupational Safety and Health Administration (OSHA)
Document number
1977-10-06
Date issued
October 6, 1977
Status
Active
Status last verified October 10, 2026

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October 6, 1977

MEMORANDUM FOR: ROBERT C. TICE, JR., Regional Administrator
ATTENTION: C. R. HOLDER, Assistant Regional Administrator for Technical Support
THRU: DONALD E. MACKENZIE, Field Coordinator
FROM: RICHARD P. WILSON, Deputy Director, Federal Compliance and State Programs
SUBJECT: Applicability of 29 CFR 1910.107 Spray Finishing Using Flammable and Combustible Materials as Referenced in 29 CFR 1910.94(c) Spray Finishing Operations

This is in response to your memorandum of August 26, 1977, regarding the applicability of 29 CFR 1910.107 as referenced in 29 CFR 1910.94(c).

Where 29 CFR 1910.94(c) references certain standards in 29 CFR 1910.107 and/or NFPA No. 33-1969, these referenced standards are applicable only when flammable and/or combustible finishing materials are applied as a spray. This opinion is based on 29 CFR 1910.107(n) Scope and NFPA No. 33-1969 Scope, paragraphs 1. and 4.

It should be noted that certain water base mixtures or water-emulsion liquids may have highly combustible residues upon evaporation of the liquid carrier. In these cases, the reference standards for minimizing the hazards of combustible residues should be followed irrespective of the characteristics of the liquid. Otherwise, a violation of Section 5(a)(1) of the Act would be considered.

The allegation raised in the fifth paragraph of your memorandum will be addressed under separate cover.

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