☣️ UN 2805 • CLASS 4
UN 2805 — Lithium hydride, fused solid
Placard: Dangerous When Wet. ERG Guide 138. 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 2805 Quick Details
UN 2805
Product name: Lithium hydride, fused solid
DOT Class: 4
Placard type: Dangerous When Wet
ERG Guide: 138 (check current ERG)
Initial isolation: ERG 138: Isolate spill 100m all directions. If fire or water contact, isolate 800m and evacuate 1600m downwind.
Common Hazards of UN 2805
- Produce flammable gases on contact with water.
- May ignite on contact with water or moist air.
- Some react vigorously or explosively on contact with water.
- May be ignited by heat, sparks or flames.
- May re-ignite after fire is extinguished.
- Some are transported in highly flammable liquids.
- Runoff may create fire or explosion hazard.
- Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
Chemical Identity & Physical Properties
| Also known as | Lithium hydride fusedLithium monohydrideLiHLithium hydride solid |
| CAS Number | 7580-67-8 |
| Appearance | Gray to white crystalline solid or powder. Odorless. Hygroscopic material that absorbs moisture from air. |
| Flash Point | Not applicable (reacts with water to produce flammable hydrogen gas) |
| Boiling Point | Not applicable (decomposes above 850C/1562F) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Reacts violently with water producing flammable hydrogen gas and heat; may ignite spontaneously. Do not use water. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2805
Extinguishing Media
Dry chemical, dry sand, dry graphite powder, or soda ash. NO water-based agents.
PPE Requirements
⚠️ Level B minimum with SCBA required. Full face protection, chemical-resistant suit. Avoid any moisture contact.
Isolation & Evacuation
ERG 138: Isolate spill 100m all directions. If fire or water contact, isolate 800m and evacuate 1600m downwind.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 138).
First Actions for a UN 2805 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- 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 300 meters (1000 feet).
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📋 Copy & Share Field Card
UN 2805 — Lithium hydride, fused solidHAZMAT RADIO NOTE — UN 2805
Product: Lithium hydride, fused solid
Class 4 / Dangerous When Wet / ERG 138
PPE: Level B minimum with SCBA required. Full face protection, chemical-resistant suit. Avoid any moisture contact.
ISOLATION: ERG 138: Isolate spill 100m all directions. If fire or water contact, isolate 800m and evacuate 1600m 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 2805 — Lithium hydride, fused solid
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 138
Appearance: Gray to white crystalline solid or powder. Odorless. Hygroscopic material that absorbs moisture from air.
Water Reactivity: Reacts violently with water producing flammable hydrogen gas and heat; may ignite spontaneously. Do not use water.
Extinguishing: Dry chemical, dry sand, dry graphite powder, or soda ash. NO water-based agents.
PPE: Level B minimum with SCBA required. Full face protection, chemical-resistant suit. Avoid any moisture contact.
Isolation: ERG 138: Isolate spill 100m all directions. If fire or water contact, isolate 800m and evacuate 1600m downwind.
— Key Hazards —
• Produce flammable gases on contact with water.
• May ignite on contact with water or moist air.
• Some react vigorously or explosively on contact with water.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Ventilate closed spaces before entering, but only if properly trained and equipped.
SOURCE: allfirefighter.com/hazmat/un/2805 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2805 Lithium hydride, fused solid Cls4 ERG138 | allfirefighter.com/hazmat/un/2805SMS / 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/2805
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Frequently Asked Questions about UN 2805
Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard. Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA required. Full face protection, chemical-resistant suit. Avoid any moisture contact.
Water reactivity: Reacts violently with water producing flammable hydrogen gas and heat; may ignite spontaneously. Do not use water.. Recommended extinguishing: Dry chemical, dry sand, dry graphite powder, or soda ash. NO water-based agents..
ERG Guide 138 recommendation: ERG 138: Isolate spill 100m all directions. If fire or water contact, isolate 800m and evacuate 1600m downwind.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 138 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.