☣️ HAZMAT HUB • UN LOOKUP • CLASS 1–9

Hazmat Hub for Firefighters

Search UN/NA numbers, explore DOT Classes 1–9, and use quick guidance for training & preplanning. Always follow SOP/SOG + current ERG.

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UN / NA Quick Lookup
Example: 1203, 1978, 1017
Tip: If you only know the placard class, use the Class guides below.
⚠️ Training/quick-reference only. For real incidents, use your SOP/SOG and the current ERG.
Popular UN pages
12031978101710051170
NFPA 704 (Diamond) Basics

Learn what the numbers 0–4 mean and what the white quadrant can indicate.

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First 5 Minutes Checklist

A simple, field-minded checklist for initial actions before Hazmat team arrives.

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Popular UN numbers by class
Small internal-link map to help discovery. Always consult current ERG + SOP/SOG.
Class 2
UN 1001UN 1002UN 1003UN 1005UN 1006UN 1008open class →
Class 3
UN 1088UN 1090UN 1091UN 1104UN 1105UN 1106open class →
Class 4
UN 1183UN 1242UN 1295UN 1309UN 1310UN 1312open class →
Class 5
UN 1438UN 1439UN 1442UN 1444UN 1445UN 1446open class →
Class 6
UN 1098UN 1135UN 1163UN 1181UN 1182UN 1238open class →
Class 7
UN 2908UN 2909UN 2910UN 2911UN 2912UN 2913open class →
Class 8
UN 1052UN 1604UN 1715UN 1716UN 1718UN 1719open class →
Class 9
UN 1350UN 1365UN 1841UN 1845UN 1931UN 1941open class →
Need a specific UN? Use the lookup above or open UN Lookup.
DOT Hazmat Classes (1–9)
Tap a class for a firefighter-friendly overview + common examples.
Class Guides
CLASS 1

Explosives

Blast/fragmentation hazards and rapid energy release—treat as high-risk, high-consequence.

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CLASS 2

Gases

Compressed, liquefied, or dissolved gases—pressure, BLEVE potential, toxic/asphyxiation risk.

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CLASS 3

Flammable Liquids

Ignitable vapors, rapid fire spread, and runoff—control ignition and protect exposures.

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CLASS 4

Flammable Solids

Materials that ignite easily, react with water, or spontaneously combust—avoid incompatible actions.

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CLASS 5

Oxidizers & Organic Peroxides

Can intensify fire and accelerate burning—cooling and isolation often critical.

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CLASS 6

Toxic & Infectious Substances

Inhalation/skin hazards and potential contamination—limit exposure and control zones.

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CLASS 7

Radioactive Materials

Control time, distance, and shielding—limit exposure and follow specialized procedures.

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CLASS 8

Corrosives

Chemical burns, toxic vapors, and container failure—avoid contact and control runoff.

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CLASS 9

Miscellaneous

Wide range: lithium batteries, environmentally hazardous substances, elevated temperature materials—case-by-case.

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First 5 Minutes Checklist

Initial approach
  • Stage uphill / upwind if possible
  • Establish isolation & deny entry
  • Identify placards/UN markings from distance
Command & safety
  • Accountability & hot/warm/cold zones
  • Protect exposures without unnecessary entry
  • Consult current ERG + local SOP/SOG

NFPA 704 (Diamond) quick meaning

0–4 scale
  • 0 = minimal hazard
  • 4 = severe hazard
  • Blue = health, Red = flammability
  • Yellow = reactivity
Firefighter usage
  • Fast risk awareness during size-up
  • Supports PPE & isolation decisions
  • Does NOT replace specific chemical research
Sources: DOT/PHMSA class definitions, NFPA 704 standard. Always consult the ERG for field operations.
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