United Nations/North American Number Datasheet

UN/NA 3208

4.3 - Dangerous when wet

Emergency Response Guidebook (ERG, 2016)

Material Names

  • Metallic substance, water-reactive, n.o.s.
ERG book cover

Response Guide 138

Substances - Water-Reactive (Emitting Flammable Gases) Sustancias - Reactivas con el Agua (Emiten Gases Inflamables) Substances - Réagissant à l’Eau (Émettant des Gaz Inflammables)


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 Metallic substance, water-reactive, n.o.s 4.3 4.3 Technical Name Required

  4.3 - Dangerous when wet