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
Acceptable use of pictograms on chemical labels under the revised Hazard Communication standard 1910.1200(f)(1), 1910.1200(f)(1)(iv), 1910.1200 App C
The requirement for single or multiple SDSs 1910.1200(g)(1), 1910.1200(g)(2)(x), 1910.1200 App D
Applicability of OSHA's Hazard Communication Standard for truck drivers hauling waste products that are exempt by EPA 1910.1200(b)(2), 1910.1200(b)(6)(i), 1910.1200(b)(6)(xi), 1910.1200(c), 1910.1200(h)(1), 1910.1200(h)(2), 1910.1200(h)(3), 1910.1200(h)(3)(ii), 1910.1200(h)(3)(iii), 1910.1096(i)(2)
What is the correct grouping/placement of the six required elements for labels 1910.1200(f)(1), 1910.1200(f)(3)
Labeling of secondary containers in laboratories under the Hazard Communication standard 1910.1200(b)(3), 1910.1450(a)(1), 1910.1450(b), 1910.1450(h)(1)(i)
Clarification on combining hazard statements on labels under the hazard communication standard 1910.1200, 1910.1200 App C
Interpretation of 1910.1200 - Clarification on effective date of SDSs replacing MSDSs 1910.1200
CPSC versus HCS 2012 labeling requirements 1910.1200
Acute Toxicity classification under hazard communication 1910.1200, 1910.1200(f)(1)(v)
Applicability of Certain OSHA Standards to Cabin Crew Members on Aircraft in Operation 1910.95, 1910.1030, 1910.1200
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) regarding Petroleum Streams 1910.1200
OSHA's Amended Hazard Communication Standard (HCS 2012) about Hazards Not Otherwise Classified 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