☣️ HAZMAT HUB · UN LOOKUP · CLASS 1–9
Hazmat Hub for Firefighters
Search UN/NA numbers, explore DOT Classes 1–9, and review NFPA 704 basics. Built for training & preplanning — always follow SOP/SOG + current ERG.
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DOT CLASSES 1–9 + UN LOOKUP
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🔎 UN / NA Quick Lookupe.g. 1203, 1978, 1017
Find the 4-digit number on the placard, orange panel, or shipping papers.
Popular lookups
UN Numbers by DOT Class
Quick-reference links. Always consult current ERG + SOP/SOG for incident actions.
2 Gases
Can't find a UN? Use the full UN Lookup →
DOT Hazmat Classes 1–9
Tap a class for firefighter-level overview, hazards, first actions, and UN examples.
🚒 First 5 Minutes Checklist
Initial approach
- Stage uphill / upwind when possible
- Establish isolation perimeter; deny entry
- ID placards & UN markings from safe distance
- Request Hazmat team early — don't wait
Command & safety
- Accountability & hot/warm/cold zones
- Protect exposures without unnecessary entry
- Consult current ERG for isolation distances
- Follow SOP/SOG — no freelancing
🟦 NFPA 704 Diamond — Quick Reference
0–4 scale meaning
- 0 = Minimal hazard
- 1 = Slight hazard
- 2 = Moderate hazard
- 3 = Serious hazard
- 4 = Severe / extreme hazard
Quadrant colors
- Blue = Health hazard
- Red = Flammability
- Yellow = Reactivity / instability
- White = Special hazards (OX, W̶ etc.)
- Fixed facilities only — does not replace SDS/ERG
FAQ
Find the UN/NA number on the placard, orange panel, shipping papers, or container markings, then consult the current ERG and your SOP/SOG. This hub helps you identify the class and common hazards quickly during training or preplanning.
No. This is a training and quick-reference aid only. Always follow your department's SOP/SOG and the current Emergency Response Guidebook (ERG) for incident-specific protective actions.
The 9 DOT hazmat transport classes are: Class 1 Explosives, Class 2 Gases, Class 3 Flammable Liquids, Class 4 Flammable Solids, Class 5 Oxidizers and Organic Peroxides, Class 6 Toxic and Infectious Substances, Class 7 Radioactive Materials, Class 8 Corrosives, and Class 9 Miscellaneous Dangerous Goods.
NFPA 704 uses a diamond-shaped sign with four colored quadrants: blue (health hazard), red (flammability), yellow (reactivity), and white (special hazards). Numbers 0 to 4 indicate severity, where 0 is minimal and 4 is severe. It is commonly found on fixed facilities and provides fast hazard awareness during size-up.
Sources: DOT/PHMSA class definitions, NFPA 704 standard overview, ERG usage principles. Always consult the current ERG for field operations.
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