☣️ UN 3194 • CLASS 4
Pyrophoric liquid, inorganic, n.o.s.
Placard: Spontaneously Combustible. 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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Quick details
UN 3194
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: isolate spill 25m all directions; if tank/container involved in fire isolate 800m all directions; consider evacuation 800m downwind
Chemical & Response Details
| Also known as | Pyrophoric liquid inorganic NOSSelf-igniting liquid inorganicSpontaneously combustible liquid inorganic |
| Appearance | Variable appearance depending on specific substance; typically a liquid that spontaneously ignites in air at or below 54°C (130°F). May be colorless to dark depending on composition. |
| Flash Point | Not applicable (ignites spontaneously in air) |
| Boiling Point | Variable depending on specific substance |
| Vapor Density | Variable depending on specific substance; typically heavier than air |
| Water Reactivity | May react violently with water, generating heat and flammable/toxic gases; avoid water contact |
| Extinguishing | Dry sand, dry chemical, soda ash; NO water or foam |
| PPE | ⚠️ Level A required; full encapsulation with SCBA; chemical-resistant gloves and boots; avoid all contact |
| Isolation | ERG 135: isolate spill 25m all directions; if tank/container involved in fire isolate 800m all directions; consider evacuation 800m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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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UN 3194 — Pyrophoric liquid, inorganic, n.o.s. HAZMAT RADIO NOTE — UN 3194
Product: Pyrophoric liquid, inorganic, n.o.s.
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level A required; full encapsulation with SCBA; chemical-resistant gloves and boots; avoid all contact
ISOLATION: ERG 135: isolate spill 25m all directions; if tank/container involved in fire isolate 800m all directions; 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 3194 — Pyrophoric liquid, inorganic, n.o.s.
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Variable appearance depending on specific substance; typically a liquid that spontaneously ignites in air at or below 54°C (130°F). May be colorless to dark depending on composition.
Water Reactivity: May react violently with water, generating heat and flammable/toxic gases; avoid water contact
Extinguishing: Dry sand, dry chemical, soda ash; NO water or foam
PPE: Level A required; full encapsulation with SCBA; chemical-resistant gloves and boots; avoid all contact
Isolation: ERG 135: isolate spill 25m all directions; if tank/container involved in fire isolate 800m all directions; consider evacuation 800m downwind
— 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/3194 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3194 Pyrophoric liquid, inorganic, n.o.s. Cls4 ERG135 | allfirefighter.com/hazmat/un/3194SMS / 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/3194
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FAQ
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; full encapsulation with SCBA; chemical-resistant gloves and boots; avoid all contact
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.