Overview of HCS 2026 Changes

OSHA has made several important updates to the Hazard Communication Standard to align with GHS Revision 7. These changes affect how employers communicate chemical hazards to workers, with key compliance deadlines in 2026.

GHS Revision 7 Adoption

The updated standard incorporates GHS Revision 7, which includes:

New hazard categories for flammable gases (1A/1B subdivision)
Updated criteria for aerosols and chemicals under pressure
Clarified criteria for skin corrosion/irritation
New hazard class for desensitized explosives

SDS Format Changes

Safety Data Sheets now require additional information in certain sections, including concentration ranges for trade secret ingredients and updated physical/chemical properties requirements.

Compliance Deadlines

Key dates to remember:

OSHA's January 2026 final rule added a 4-month extension to the original deadlines. The current dates are:

Substances — Chemical manufacturers and importers: May 19, 2026
Substances — Employers (as necessary: alternative workplace labeling, written program, and training for newly identified hazards): November 20, 2026
Mixtures — Chemical manufacturers and importers: November 19, 2027
Mixtures — Employers (update workplace labels, written program, and training): May 19, 2028

Action Items for Employers

To prepare for these changes:

Review your current SDS inventory
Request updated SDSs from suppliers
Update employee training programs
Review and update workplace labels

2026 Updates

OSHA HazCom Standard: Key Updates & GHS Rev 7 Transition