☣️ UN 3392 • CLASS 4
UN 3392 — Organometallic substance, liquid, pyrophoric
Placard: Spontaneously Combustible. ERG Guide 135. 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 3392 Quick Details
UN 3392
Product name: Organometallic substance, liquid, pyrophoric
DOT Class: 4
Placard type: Spontaneously Combustible
ERG Guide: 135 (check current ERG)
Initial isolation: ERG 135: Initial isolation 100m all directions; protective action distance 300m downwind (large spill day), 800m (large spill night)
Common Hazards of UN 3392
- Flammable/combustible material.
- May ignite on contact with moist air or moisture.
- May burn rapidly with flare-burning effect.
- Some react vigorously or explosively on contact with water.
- Some may decompose explosively when heated or involved in a fire.
- May re-ignite after fire is extinguished.
- Runoff may create fire or explosion hazard.
- Containers may explode when heated.
Chemical Identity & Physical Properties
| Also known as | Pyrophoric organometallic liquidOrganometallic compound, pyrophoricMetal alkyl liquidMetal organic compound, pyrophoric |
| Appearance | Colorless to pale yellow liquid, specific appearance varies by compound. Many have pungent or unpleasant odors. Spontaneously ignites on contact with air or moisture. |
| Flash Point | Not applicable (pyrophoric - spontaneously combustible in air) |
| Boiling Point | Varies widely by specific compound, typically 50-200°C (122-392°F) |
| Vapor Density | Generally heavier than air (varies by compound, typically 2-8) |
| Water Reactivity | Reacts violently with water, producing flammable gases and heat; may ignite spontaneously. Never use water. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3392
Extinguishing Media
Dry sand, soda ash, dry chemical (Class D for metal fires); no water or foam
PPE Requirements
⚠️ Level A required; SCBA mandatory; chemical-resistant suit; avoid all moisture contact; specialized training required
Isolation & Evacuation
ERG 135: Initial isolation 100m all directions; protective action distance 300m downwind (large spill day), 800m (large spill night)
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 135).
First Actions for a UN 3392 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
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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📋 Copy & Share Field Card
UN 3392 — Organometallic substance, liquid, pyrophHAZMAT RADIO NOTE — UN 3392
Product: Organometallic substance, liquid, pyrophoric
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level A required; SCBA mandatory; chemical-resistant suit; avoid all moisture contact; specialized training required
ISOLATION: ERG 135: Initial isolation 100m all directions; protective action distance 300m downwind (large spill day), 800m (large spill night)
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 3392 — Organometallic substance, liquid, pyrophoric
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Colorless to pale yellow liquid, specific appearance varies by compound. Many have pungent or unpleasant odors. Spontaneously ignites on contact with air or moisture.
Water Reactivity: Reacts violently with water, producing flammable gases and heat; may ignite spontaneously. Never use water.
Extinguishing: Dry sand, soda ash, dry chemical (Class D for metal fires); no water or foam
PPE: Level A required; SCBA mandatory; chemical-resistant suit; avoid all moisture contact; specialized training required
Isolation: ERG 135: Initial isolation 100m all directions; protective action distance 300m downwind (large spill day), 800m (large spill night)
— Key Hazards —
• Flammable/combustible material.
• May ignite on contact with moist air or moisture.
• May burn rapidly with flare-burning effect.
— 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/3392 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3392 Organometallic substance, liquid, pyrophoric Cls4 ERG135 | allfirefighter.com/hazmat/un/3392SMS / 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/3392
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Frequently Asked Questions about UN 3392
Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
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 A required; SCBA mandatory; chemical-resistant suit; avoid all moisture contact; specialized training required
Water reactivity: Reacts violently with water, producing flammable gases and heat; may ignite spontaneously. Never use water.. Recommended extinguishing: Dry sand, soda ash, dry chemical (Class D for metal fires); no water or foam.
ERG Guide 135 recommendation: ERG 135: Initial isolation 100m all directions; protective action distance 300m downwind (large spill day), 800m (large spill night)
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 135 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.