☣️ UN 3132 • CLASS 4
UN 3132 — Water-reactive solid, flammable, n.o.s.
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 3132 Quick Details
UN 3132
Product name: Water-reactive solid, flammable, n.o.s.
DOT Class: 4
Placard type: Dangerous When Wet
ERG Guide: 138 (check current ERG)
Initial isolation: ERG 138: Initial isolation 50m in all directions; protective action distance 100m downwind during day for small spills; avoid water contact; evacuate if fire threatens containers
Common Hazards of UN 3132
- 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 | Water-reactive solid, flammable, not otherwise specifiedFlammable water-reactive solid NOSDangerous when wet solid, flammable |
| Appearance | Varies by specific substance; typically solid material that may be powder, granules, or chunks. Color and odor depend on the specific chemical covered under this n.o.s. entry. |
| Flash Point | Not applicable (ignites spontaneously on contact with water) |
| Boiling Point | Not applicable (solid material, varies by specific substance) |
| Vapor Density | Not applicable (solid material at ambient conditions) |
| Water Reactivity | Reacts with water producing flammable gases (hydrogen, methane, or other flammable gases); may ignite spontaneously; never use water directly on material |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3132
Extinguishing Media
Dry chemical, dry sand, dry ground limestone; DO NOT use water, foam, or CO2
PPE Requirements
⚠️ Level B minimum with SCBA; full protective clothing including chemical-resistant suit; avoid moisture exposure
Isolation & Evacuation
ERG 138: Initial isolation 50m in all directions; protective action distance 100m downwind during day for small spills; avoid water contact; evacuate if fire threatens containers
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 138).
First Actions for a UN 3132 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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UN 3132 — Water-reactive solid, flammable, n.o.s.HAZMAT RADIO NOTE — UN 3132
Product: Water-reactive solid, flammable, n.o.s.
Class 4 / Dangerous When Wet / ERG 138
PPE: Level B minimum with SCBA; full protective clothing including chemical-resistant suit; avoid moisture exposure
ISOLATION: ERG 138: Initial isolation 50m in all directions; protective action distance 100m downwind during day for small spills; avoid water contact; evacuate if fire threatens containers
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 3132 — Water-reactive solid, flammable, n.o.s.
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 138
Appearance: Varies by specific substance; typically solid material that may be powder, granules, or chunks. Color and odor depend on the specific chemical covered under this n.o.s. entry.
Water Reactivity: Reacts with water producing flammable gases (hydrogen, methane, or other flammable gases); may ignite spontaneously; never use water directly on material
Extinguishing: Dry chemical, dry sand, dry ground limestone; DO NOT use water, foam, or CO2
PPE: Level B minimum with SCBA; full protective clothing including chemical-resistant suit; avoid moisture exposure
Isolation: ERG 138: Initial isolation 50m in all directions; protective action distance 100m downwind during day for small spills; avoid water contact; evacuate if fire threatens containers
— 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/3132 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3132 Water-reactive solid, flammable, n.o.s. Cls4 ERG138 | allfirefighter.com/hazmat/un/3132SMS / 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/3132
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Frequently Asked Questions about UN 3132
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; full protective clothing including chemical-resistant suit; avoid moisture exposure
Water reactivity: Reacts with water producing flammable gases (hydrogen, methane, or other flammable gases); may ignite spontaneously; never use water directly on material. Recommended extinguishing: Dry chemical, dry sand, dry ground limestone; DO NOT use water, foam, or CO2.
ERG Guide 138 recommendation: ERG 138: Initial isolation 50m in all directions; protective action distance 100m downwind during day for small spills; avoid water contact; evacuate if fire threatens containers
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.