☣️ UN 2813 • CLASS 4
UN 2813 — Water-reactive solid, 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 2813 Quick Details
UN 2813
Product name: Water-reactive solid, n.o.s.
DOT Class: 4
Placard type: Dangerous When Wet
ERG Guide: 138 (check current ERG)
Initial isolation: ERG 138: Initial isolation 25m in all directions. Protective action distance: Spill 100m downwind daytime, 300m nighttime. Fire: 800m radius evacuation.
Common Hazards of UN 2813
- 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 not otherwise specifiedDangerous when wet solid n.o.s.Water-sensitive solidHydro-reactive solid |
| Appearance | Appearance varies widely as this is a generic classification. May be powder, granules, or solid pieces. Color and odor depend on specific substance. Reacts with water to produce flammable gases. |
| Flash Point | Not applicable (reacts with water to produce flammable gases) |
| Boiling Point | Not applicable (varies by specific substance) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Reacts with water or moisture to produce flammable gases. May ignite spontaneously. Some substances react violently or explosively. Keep dry at all times. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2813
Extinguishing Media
Dry chemical, dry sand, dry sodium chloride powder. DO NOT use water, foam, or any water-based extinguishing agents.
PPE Requirements
⚠️ Level B minimum with SCBA required. Chemical-resistant suit and gloves. Keep upwind and avoid all contact with material and its water reaction products.
Isolation & Evacuation
ERG 138: Initial isolation 25m in all directions. Protective action distance: Spill 100m downwind daytime, 300m nighttime. Fire: 800m radius evacuation.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 138).
First Actions for a UN 2813 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 2813 — Water-reactive solid, n.o.s.HAZMAT RADIO NOTE — UN 2813
Product: Water-reactive solid, n.o.s.
Class 4 / Dangerous When Wet / ERG 138
PPE: Level B minimum with SCBA required. Chemical-resistant suit and gloves. Keep upwind and avoid all contact with material and its water reaction products.
ISOLATION: ERG 138: Initial isolation 25m in all directions. Protective action distance: Spill 100m downwind daytime, 300m nighttime. Fire: 800m radius evacuation.
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 2813 — Water-reactive solid, n.o.s.
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 138
Appearance: Appearance varies widely as this is a generic classification. May be powder, granules, or solid pieces. Color and odor depend on specific substance. Reacts with water to produce flammable gases.
Water Reactivity: Reacts with water or moisture to produce flammable gases. May ignite spontaneously. Some substances react violently or explosively. Keep dry at all times.
Extinguishing: Dry chemical, dry sand, dry sodium chloride powder. DO NOT use water, foam, or any water-based extinguishing agents.
PPE: Level B minimum with SCBA required. Chemical-resistant suit and gloves. Keep upwind and avoid all contact with material and its water reaction products.
Isolation: ERG 138: Initial isolation 25m in all directions. Protective action distance: Spill 100m downwind daytime, 300m nighttime. Fire: 800m radius evacuation.
— 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/2813 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2813 Water-reactive solid, n.o.s. Cls4 ERG138 | allfirefighter.com/hazmat/un/2813SMS / 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/2813
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Frequently Asked Questions about UN 2813
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. Chemical-resistant suit and gloves. Keep upwind and avoid all contact with material and its water reaction products.
Water reactivity: Reacts with water or moisture to produce flammable gases. May ignite spontaneously. Some substances react violently or explosively. Keep dry at all times.. Recommended extinguishing: Dry chemical, dry sand, dry sodium chloride powder. DO NOT use water, foam, or any water-based extinguishing agents..
ERG Guide 138 recommendation: ERG 138: Initial isolation 25m in all directions. Protective action distance: Spill 100m downwind daytime, 300m nighttime. Fire: 800m radius evacuation.
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.