October 7, 2026
OSHA’s 2024 Hazard Communication Standard update principally aligned the federal standard with Revision 7 of the Globally Harmonized System. The final rule was published on May 20, 2024 and took effect on July 19, 2024. It revised how covered chemical hazards are classified and communicated.
APT’s OSHA GHS Revision 7 tracker record connects revised hazard information with the amended supplier and employer schedules.
Information supplied with a chemical can change
The amendments cover hazard classification, labels, safety data sheet content and trade-secret provisions. They include provisions for small containers. For a downstream employer, a revised supplier document may therefore require changes to the information workers receive about the chemicals they handle.
An effective date identifies when the rule takes legal effect. The rule also provided phased compliance periods for substances and mixtures. OSHA subsequently changed those dates through a January 2026 amendment. Federal substance suppliers had a May 19, 2026 milestone; employers’ substance-related updates are due November 20, 2026. The corresponding mixture dates are November 19, 2027 and May 19, 2028.
Review the changed hazard information
APT’s practical interpretation is to compare revised safety data sheets with the versions used in the workplace. The useful question is which classifications or warnings changed and whether those changes affect workplace labels, the written program or additional employee training. A document’s revision date alone does not describe the change.
This development concerns hazard communication. It does not establish an across-the-board revision of permissible exposure limits. Exposure-limit requirements and the employer’s hazard-communication duties should remain separately identified in the program.
The dates above are federal dates. Employers operating under an OSHA-approved State Plan need to check that jurisdiction’s adoption and applicable schedule before applying the federal transition dates to their site.
Find related developments in the industrial hygiene regulatory tracker.
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