☣️ UN 3190 • CLASS 4
Self-heating solid, 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 3190
Class: 4
Placard type: Spontaneously Combustible
ERG: Guide 135 (check current ERG)
Isolation: ERG 135: Initial isolation 50m all directions; protective action distance 100m downwind for small spills, 300m for large spills
Chemical & Response Details
| Also known as | Self-heating solid inorganic NOSSpontaneously heating solid inorganicPyrophoric inorganic solid |
| Appearance | Variable appearance depending on specific substance; typically a dry powder or granular solid. May be gray, black, or metallic in color. Generally odorless or may have a slight metallic odor. |
| Flash Point | Not applicable (self-heating/pyrophoric material) |
| Boiling Point | Not applicable (varies by specific inorganic compound) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | May react with moisture or water; some materials ignite on contact with moist air. Avoid water application unless specifically known to be safe. |
| Extinguishing | Dry sand, dry chemical, soda ash; avoid water-based agents unless material-specific data confirms safety |
| PPE | ⚠️ Level B minimum with SCBA; heat-resistant clothing recommended; avoid moisture on gloves/equipment |
| Isolation | ERG 135: Initial isolation 50m all directions; protective action distance 100m downwind for small spills, 300m for large spills |
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 3190 — Self-heating solid, inorganic, n.o.s. HAZMAT RADIO NOTE — UN 3190
Product: Self-heating solid, inorganic, n.o.s.
Class 4 / Spontaneously Combustible / ERG 135
PPE: Level B minimum with SCBA; heat-resistant clothing recommended; avoid moisture on gloves/equipment
ISOLATION: ERG 135: Initial isolation 50m all directions; protective action distance 100m downwind for small spills, 300m for large spills
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 3190 — Self-heating solid, inorganic, n.o.s.
Class: 4 | Placard: Spontaneously Combustible | ERG Guide: 135
Appearance: Variable appearance depending on specific substance; typically a dry powder or granular solid. May be gray, black, or metallic in color. Generally odorless or may have a slight metallic odor.
Water Reactivity: May react with moisture or water; some materials ignite on contact with moist air. Avoid water application unless specifically known to be safe.
Extinguishing: Dry sand, dry chemical, soda ash; avoid water-based agents unless material-specific data confirms safety
PPE: Level B minimum with SCBA; heat-resistant clothing recommended; avoid moisture on gloves/equipment
Isolation: ERG 135: Initial isolation 50m all directions; protective action distance 100m downwind for small spills, 300m for large spills
— 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/3190 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3190 Self-heating solid, inorganic, n.o.s. Cls4 ERG135 | allfirefighter.com/hazmat/un/3190SMS / 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/3190
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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 B minimum with SCBA; heat-resistant clothing recommended; avoid moisture on gloves/equipment
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.