Field reference · Hazmat

HazMat Pro

Every DOT placard, 55+ UN numbers with their ERG guide numbers, all 9 GHS pictograms, and a voice-powered Identify tool — for CDL drivers, dispatchers, EHS officers, and first responders.

You pull up alongside a placarded tanker or a shipping label you don't recognize, and you need the answer in seconds, not a PDF search. HazMat Pro puts the placard table, the UN number index, and the terminology in your pocket — most of it without a signal bar in sight.

Download on the App Store What's inside
9 hazard classes 19 placard divisions 55+ UN numbers Works offline $3.99 one-time
01

What's inside

Built for the moment you need it, not the moment you have signal. One-time purchase, no subscription, no ads — and placards, UN numbers, glossary and quick reference all work fully offline.

Placards All 19 DOT placards Every hazard class and division — Explosives through Miscellaneous Dangerous Goods — with color, symbol, common UN numbers, and handling notes. 49 CFR
Lookup UN number index 55+ entries cross-checked against the ERG and 49 CFR §172.101, with hazard class, packing group, and ERG guide number. Star the ones you use most. §172.101 · ERG
Identify Hold to speak Say or type a UN number, a shipping name, or a description — "smoking pallet of batteries after a forklift strike" — and get a material ID with isolation, PPE, and response guidance. Voice or text
Glossary GHS & DOT terminology Plain-English definitions for the terms on shipping papers and SDS sheets, plus all 9 official GHS pictograms. 9 pictograms
Quick ref PPE and isolation zones PPE levels, isolation distances, and SDS/ERG basics laid out for a fast glance — the things you need to confirm, not relearn. Field basics
Quiz CDL-style quiz mode Hand-written questions across placards, UN numbers, and glossary terms — practice recall the way it's actually tested. Endorsement prep
02

Five tabs

The app is laid out the way a field reference gets used — one tab per question you're likely to have, with Quiz mode a tap away from the header.

HazMat Pro Placards tab: a searchable grid of DOT placards showing Explosives divisions 1.1 through 1.6, Flammable Gas, Non-Flammable Gas and Poison Gas, each with its division number and hazard description.
01 Placards
HazMat Pro UN Numbers tab: a searchable list showing UN1223 Kerosene, UN1863 Jet A / JP-8, UN1170 Ethanol and others, each tagged with hazard class, packing group and ERG guide number, with a star to save it.
02 UN Numbers
HazMat Pro Identify tab: the spoken query "Smoking pallet of batteries after a forklift strike" resolved to lithium ion batteries, UN3480 or UN3481, Guide 147, with isolation, PPE and response guidance listed below.
05 Identify
01 Placards Browse or search all 19 DOT placard divisions with full artwork and handling notes.
02 UN Numbers Searchable, starrable index of 55+ UN numbers with class, packing group, and guide number.
03 Glossary GHS and DOT terminology in plain English, with all 9 pictograms.
04 Quick Ref PPE, isolation zones, and SDS/ERG basics for a fast glance in the field.
05 Identify Hold to speak or type — a UN number, a shipping name, or a free-text description.
03

In the field

Identify takes the question the way you'd ask a partner, not the way a database wants it.

Identify query

“Smoking pallet of batteries after a forklift strike”

What comes back
Material Lithium ion batteries — damaged, thermal event
UN number UN3480 or UN3481
Class 9 — Miscellaneous dangerous goods
ERG guide 147
Response Full PPE, evacuate and establish a perimeter, no water unless thermal runaway is already uncontrolled, and monitor for re-ignition for hours after apparent extinguishment

Try the free UN number lookup →

04

Get it

$3.99, once. No subscription, no ads, no in-app purchases, no account.

19 placard divisions 55+ UN numbers Works offline iOS
Download on the App Store Support
05

Questions

What is a DOT hazmat placard?

A DOT hazmat placard is the diamond-shaped sign required on vehicles and containers transporting hazardous materials in the US, identifying the hazard class — like Flammable Liquid, Corrosive, or Explosives — by color, symbol, and class number under 49 CFR. HazMat Pro includes all 19 placard divisions with color, symbol, and handling notes.

What is a UN number?

A UN number is a four-digit code assigned by the United Nations to identify a specific hazardous material or class of materials during transport, such as UN1203 for gasoline or UN1830 for sulfuric acid. HazMat Pro's UN Numbers tab includes 55+ entries with shipping name, hazard class, packing group, and ERG guide number.

What is the ERG (Emergency Response Guidebook)?

The Emergency Response Guidebook is the standard reference used by first responders during the initial phase of a hazmat transportation incident, jointly published by the US DOT, Transport Canada, and Mexico's SCT. It assigns each material a guide number with isolation distances and response guidance. HazMat Pro references current ERG guide numbers throughout its placard and UN number data.

Does HazMat Pro replace the official ERG guidebook?

No. HazMat Pro is a field reference and training aid meant to speed up lookups and build familiarity with placards, UN numbers, and terminology. It's not affiliated with the DOT or PHMSA and doesn't replace the current official ERG, your organization's SOPs, or CHEMTREC in an actual incident — always confirm against the current official guidebook before acting on this data in the field.

Does this app work offline?

Yes, for almost everything. Placards, UN numbers, the glossary, and quick reference are all stored on-device. Identify resolves exact UN numbers and known shipping names offline too — only free-text or descriptive queries that aren't already in the local database need a network connection.

Who is this app for?

HazMat Pro is built for CDL drivers with a hazmat endorsement, dispatchers, warehouse and logistics staff, EHS and safety officers, and first responders who need a fast placard, UN number, or terminology lookup without carrying a physical guidebook.

Is there a subscription?

No. HazMat Pro is a one-time purchase — no subscription, no ads, no in-app purchases.

06

Free tools & guides

The reference material behind the app, on the web and free to use.

Guide DOT Placard Guide All 19 placard divisions with color, symbol, and what each one means on the road. 49 CFR → Tool UN Number Lookup Search a UN number or shipping name for class, packing group, and ERG guide number. §172.101 → Tool ERG Guide Number Finder Go from a material or UN number to its ERG guide number and initial response guidance. ERG → Study CDL Hazmat Endorsement Guide What the hazmat endorsement test covers, and how to study for it. CDL →
Disclaimer

HazMat Pro is an independent field reference and training aid, not affiliated with the US DOT, PHMSA, the ERG's publisher, or CHEMTREC. Placard and UN number data has been cross-checked against the Emergency Response Guidebook and 49 CFR §172.101, but this app does not replace the current official guidebook, your organization's procedures, or CHEMTREC in an actual emergency. Always confirm against current official sources before acting on this data in the field.