Last updated: 2026-04-30T00:00:00+00:00 · 2 tools in this category
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HAZMAT ☣️UN Number Lookup2,063 UN/NA numbers — placard, hazard class, ERG initial action guide. Search UN# → HAZMAT 📦DOT Class HubAll 9 DOT hazmat classes — placards, divisions, real examples, transport rules. Browse Classes →

From placard to first action

Every hazmat incident starts with the same question: what is on the truck, in the pipe, or in the package? These two tools speed up the placard-to-action workflow.

UN/NA number lookup

Search by 4-digit UN number, common name, or chemical formula. Each entry shows hazard class + division, packing group, ERG guide page, and primary placard. Use during initial size-up while waiting for the hazmat team to arrive.

DOT class hub

Browse all 9 hazmat classes with their divisions: explosives (1.1–1.6), gases (2.1–2.3), flammable liquids (3), flammable solids/spontaneously combustible/dangerous when wet (4.1–4.3), oxidizers/organic peroxides (5.1–5.2), poisons/infectious (6.1–6.2), radioactive (7), corrosives (8), miscellaneous (9). Each class page lists transport requirements and common scene examples.

FAQ

A 4-digit UN/NA number identifies the specific substance or category in transport. From the number you can derive: hazard class + division, packing group, primary and subsidiary placard, ERG initial action guide page, isolation distance, and protective action distance. UN numbers are required on placards for many hazardous materials in U.S. transport.

Class 1 Explosives · Class 2 Gases (flammable, non-flammable, toxic) · Class 3 Flammable liquids · Class 4 Flammable solids / spontaneously combustible / dangerous when wet · Class 5 Oxidizers and organic peroxides · Class 6 Poisons and infectious substances · Class 7 Radioactive · Class 8 Corrosives · Class 9 Miscellaneous (ELI batteries, environmental hazards).

The Emergency Response Guidebook gives initial isolation and protective action distances for the first 30 minutes. After that, you need a hazmat team, the shipper's safety data sheet, CHEMTREC (1-800-424-9300), and possibly local hazmat resources (CAMEO/MARPLOT). Always isolate, deny entry, and request hazmat early — even a small leak escalates fast.

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Training reference only. All tools are for informational and training purposes and do not replace official department policies, training, medical protocols, or professional judgment. Always follow your AHJ and your department's SOP/SOG.