Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

NOTICE:

How to Request a Letter of Interpretation

Filters


Date Title Standard Number
Electronic distribution of safety data sheets (SDSs) under the revised Hazard Communication standard 1910.1200(g)(6)(ii)
Hazard Communication Standard labeling and SDS for laboratory nuclear standards 1910.1200
Use of split entry concept under OSHA's Hazard Communication Standard (HCS 2012) 1910.1200
Request for Interpretation of OSHA's Hazard Communication Standard for Combustible Dust 1910.1200
Manufacturer's name and address on the label of a chemical product under HCS 2012 1910.1200(f)(1), 1910.1200(f)(1)(vi)
Clarification on labeling and SDS requirements under HCS 2012. 1910.1200
Employers responsibilities under HCS 2012 to classify hazards and create SDSs for products whose manufacturers are no longer in business. 1910.1200
Pictogram requirements for product labels under the revised Hazard Communication standard. 1910.1200
Clarification of OSHA safety requirements between a temporary staffing agency and its client 1904.31, 1910.1200
Labeling requirements for Diatomaceous Earth 1910.1200
Hazard communication of ammonia gas from new fuel additive in diesel trucks 1910.1200
MSDS Distributors 1910.1200
Dental office employers with one or more employees must comply with the OSH Act. 1975.4, 1910.1200, 1910.1030, 1910.132
Clarification on the applicability of the Hazard Communication standard DEF tank operations. 1910.1200, 1910.1000
Clarification of sampling and testing protocols for determining employee exposure to airborne contaminants. 1910.1048, 1910.1048(c)(2), 1910.1200
Requirement to list carcinogens on labels under GHS. 1910.1200, 1910.1200(f)(11), 1910.1200(g)(5)
Clarification of Hazcom provision intended to preempt conflicting state regulatory actions, but not tort claims. 1910.1200, 1910.1200(a)(2)
Requirement to name hazardous ingredients on MSDSs. 1910.1200
Determination of a manufactured product as an article under the Hazard Communication standard. 1910.1200
Applicability of the Hazard Communication standard to DEF tank operations. 1910.1200, 1910.1200(d)(3), 1910.1200(h)(3), 1910.1200(g)(8)