United Nations/North American Number Datasheet

UN/NA 3159

2.2 - Non-flammable, non-poisonous gas

Emergency Response Guidebook (ERG, 2020)

Material Names

  • Refrigerant gas R-134a
  • 1,1,1,2-Tetrafluoroethane
ERG book cover

Response Guide 126

Gases - Compressed or Liquefied (Including Refrigerant Gases) Gases - Comprimidos o Licuados (Incluyendo Gases Refrigerantes) Gaz - Comprimés ou Liquéfiés (Incluant des Gaz Réfrigérants)


There are no initial isolation and protective action distances listed in the ERG.

The ERG doesn't predict that large amounts of toxic-by-inhalation gases will be produced if this material is spilled in water.

Hazmat Table (49 CFR 172.101)

UN/NA Proper Shipping Name Hazard Class Labels Notes*

* There are three notes: (1) whether the displayed information is for domestic (U.S.) or international shipping (if neither is specifically indicated, it applies to both), (2) whether the proper shipping name must include one or more technical names of the hazardous material in parentheses, and (3) whether the hazardous material is an inhalation hazard.
UN 1,1,1,2-Tetrafluoroethane or Refrigerant gas R 134a 2.2 2.2

  2.2 - Non-flammable, non-poisonous gas