Search by UN number or material name to find the hazard class, packing group, and ERG guide number. Covers 100+ of the most commonly shipped hazardous materials — no sign-up, works right in your browser.
| UN Number | Proper Shipping Name | Class | PG | ERG Guide |
|---|
PG = Packing Group (I = greatest danger, II = medium, III = minor; "—" means not applicable, mainly for gases). ERG Guide is the response guide page number in the current DOT/Transport Canada Emergency Response Guidebook.
A UN number identifies the specific material inside a shipment — not just its hazard class. Two loads can carry the same placard but different UN numbers, and the UN number is what a dispatcher, driver, or first responder actually keys off of when pulling shipping papers or calling in an incident. That one four-digit code resolves to a hazard class, a packing group, and an ERG guide number for response guidance — this tool does all three lookups at once.
Looking for the placard itself, not just the number? See the DOT Placard Guide for all 9 hazard classes and 19 divisions. Just need the guide number fast? Try the ERG Guide Number Finder.
This page covers 100+ common UN numbers for a quick browser lookup. HazMat Pro puts a larger UN number database, all 19 DOT placard divisions, GHS pictograms, and a voice-powered Identify tool in your pocket — fully offline, one-time purchase.
UN numbers, placards, ERG guide numbers, and GHS pictograms — searchable, starrable, and fully offline.
Open HazMat ProA four-digit code identifying the specific material being shipped, such as UN1203 for gasoline or UN1830 for sulfuric acid. It's listed on shipping papers and often on the placard or an orange panel.
Search above by UN number or material name. Each result includes the ERG guide number — the response guide page in the Emergency Response Guidebook for that material.
PG I is greatest danger, PG II is medium, PG III is minor. Gases and some other classes don't use a packing group.
No — it covers 100+ of the most commonly shipped and searched UN numbers as a free reference. HazMat Pro's UN Numbers tab has a larger, fully offline-searchable database.
Type a UN number or material, get the guide number.
Placards, UN numbers, ERG guide numbers, and Identify — offline.
All 9 hazard classes and divisions explained.
What's tested, key facts, and practice questions.