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OSHA defined hazards and HNOC
  • Defined hazards include pyrophoric gases, simple asphyxiants, and combustible dusts.

OSHA has also added three “defined hazards” into the HazCom standard to address known hazards that have no corresponding Globally Harmonized System (GHS) classification. These OSHA defined hazards are:

  • Pyrophoric gases
  • Simple asphyxiants
  • Combustible dusts

Hazards not otherwise classified (HNOC)

A “hazard not otherwise classified ” is a chemical with adverse physical or health effects which either fall below the cut-off value/concentration limit of the hazard class or is under a GHS hazard category that has not been adopted by OSHA (e.g., acute toxicity Category 5).