United Nations/North American Number Datasheet

UN/NA 3533

4.1 - Flammable solid

Emergency Response Guidebook (ERG, 2016)

Polymerizable warning Materials may undergo violent polymerization if subjected to heat or contamination.

Material Names

  • Polymerizing substance, solid, temperature controlled, n.o.s.
ERG book cover

Response Guide 150

Substances (Self-Reactive / Temperature Controlled) Sustancias (Auto Reactivas / Temperatura Controlada) Substances (Autoréactives / sous Contrôle de Température)


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 Polymerizing substance, solid, temperature controlled, n.o.s 4.1 4.1 Technical Name Required

  4.1 - Flammable solid