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
OSHA's Amended Hazard Communication Standard (HCS 2012) about classification criteria for Single Target Organ Toxicity 1910.1200
OSHA's Amended Hazard Communication Standard (HCS 2012) about Hazards Not Otherwise Classified 1910.1200
OSHA's Amended Hazard Communication Standard (HCS 2012) regarding Petroleum Streams 1910.1200
Application of OSHA's Amended Hazard Communication Standard (HCS 2012) to Combustible Dust (1910.1200)] 1910.1200
Classification of Combustible Dusts under the Revised Hazard Communication Standard. [1910.1200; 1910.1200(d)] 1910.1200(d), 1910.1200
Interim Guidance on Enforcement of the revised Hazard Communication Standard 1910.1200(j)(1), 1910.1200(h), 1910.1200(h)(3)(iv)
List in SDS section 3 when the classification is based on mixture data 1910.1200(d)(3)(i)
Labels on ampoules 5mL or smaller 1910.1200(f)(1)
Practical accommodation for hazard communication labels on small shipped chemical containers 1910.1200(f)(1)
NIST labeling of Small Packages. 1910.1200
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