☣️ UN 1326 • CLASS 4
UN 1326 — Hafnium powder, wetted with not less than 25% water
Placard: Flammable Solid. ERG Guide 170. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 1326 Quick Details
UN 1326
Product name: Hafnium powder, wetted with not less than 25% water
DOT Class: 4
Placard type: Flammable Solid
ERG Guide: 170 (check current ERG)
Initial isolation: ERG 170: isolate spill 25m all directions. If fire, isolate 800m and consider evacuation 800m downwind.
Common Hazards of UN 1326
- May react violently or explosively on contact with water.
- Some are transported in flammable liquids.
- May be ignited by friction, heat, sparks or flames.
- Some of these materials will burn with intense heat.
- Dusts or fumes may form explosive mixtures in air.
- Containers may explode when heated.
- May re-ignite after fire is extinguished.
- Oxides from metallic fires are a severe health hazard.
Chemical Identity & Physical Properties
| Also known as | Hafnium metal powderHafnium powder wettedHf powderHafnium flammable solid |
| CAS Number | 7440-58-6 |
| Appearance | Gray to silver metallic powder, odorless. Shipped wetted with minimum 25% water to reduce pyrophoric hazard. |
| Flash Point | Not applicable (pyrophoric metal powder when dry) |
| Boiling Point | 4603C (8317F) |
| Vapor Density | Not applicable (solid metal) |
| Water Reactivity | Reacts with water when dry, generating heat and hydrogen gas. Wetted form designed to prevent ignition. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1326
Extinguishing Media
Dry sand, dry chemical, soda ash. Do not use water or foam on dry material.
PPE Requirements
⚠️ Level B minimum; full face respirator, chemical-resistant gloves and suit. SCBA if fire involved.
Isolation & Evacuation
ERG 170: isolate spill 25m all directions. If fire, isolate 800m and consider evacuation 800m downwind.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 170).
First Actions for a UN 1326 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- Consider initial downwind evacuation for at least 50 meters (160 feet).
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📋 Copy & Share Field Card
UN 1326 — Hafnium powder, wetted with not less thaHAZMAT RADIO NOTE — UN 1326
Product: Hafnium powder, wetted with not less than 25% water
Class 4 / Flammable Solid / ERG 170
PPE: Level B minimum; full face respirator, chemical-resistant gloves and suit. SCBA if fire involved.
ISOLATION: ERG 170: isolate spill 25m all directions. If fire, isolate 800m and consider evacuation 800m downwind.
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1326 — Hafnium powder, wetted with not less than 25% water
Class: 4 | Placard: Flammable Solid | ERG Guide: 170
Appearance: Gray to silver metallic powder, odorless. Shipped wetted with minimum 25% water to reduce pyrophoric hazard.
Water Reactivity: Reacts with water when dry, generating heat and hydrogen gas. Wetted form designed to prevent ignition.
Extinguishing: Dry sand, dry chemical, soda ash. Do not use water or foam on dry material.
PPE: Level B minimum; full face respirator, chemical-resistant gloves and suit. SCBA if fire involved.
Isolation: ERG 170: isolate spill 25m all directions. If fire, isolate 800m and consider evacuation 800m downwind.
— Key Hazards —
• May react violently or explosively on contact with water.
• Some are transported in flammable liquids.
• May be ignited by friction, heat, sparks or flames.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Stay upwind, uphill and/or upstream.
• Keep unauthorized personnel away.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1326 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1326 Hafnium powder, wetted with not less than 25% water Cls4 ERG170 | allfirefighter.com/hazmat/un/1326SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/1326
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Frequently Asked Questions about UN 1326
May react violently or explosively on contact with water. Some are transported in flammable liquids. May be ignited by friction, heat, sparks or flames. Some of these materials will burn with intense heat. Dusts or fumes may form explosive mixtures in air. Containers may explode when heated. May re-ignite after fire is extinguished. Oxides from metallic fires are a severe health hazard.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Stay upwind, uphill and/or upstream. Keep unauthorized personnel away.
Level B minimum; full face respirator, chemical-resistant gloves and suit. SCBA if fire involved.
Water reactivity: Reacts with water when dry, generating heat and hydrogen gas. Wetted form designed to prevent ignition.. Recommended extinguishing: Dry sand, dry chemical, soda ash. Do not use water or foam on dry material..
ERG Guide 170 recommendation: ERG 170: isolate spill 25m all directions. If fire, isolate 800m and consider evacuation 800m downwind.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 170 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.