☣️ UN 1426 • CLASS 4
Sodium borohydride
Placard: Dangerous When Wet. 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 1426
Class: 4
Placard type: Dangerous When Wet
ERG: Guide 138 (check current ERG)
Isolation: ERG 138: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind if fire
Chemical & Response Details
| Also known as | Sodium tetrahydroborateSodium tetrahydridoborateNaBH4Burohydrure de sodium |
| CAS Number | 16940-66-2 |
| Appearance | White to grayish-white crystalline or granular powder. Odorless or slight amine-like odor. Hygroscopic solid at room temperature. |
| Flash Point | Not applicable (solid); generates flammable hydrogen gas on contact with water or moisture |
| Boiling Point | Not applicable (decomposes above 400C/752F before boiling) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Reacts with water to release flammable hydrogen gas; reaction accelerates with acids or heat. Keep dry. |
| Extinguishing | Dry chemical (Class D if available), dry sand, soda ash; DO NOT use water, foam, CO2, or halogenated agents |
| PPE | ⚠️ Level B minimum with SCBA; full face shield and chemical-resistant gloves; avoid moisture contact |
| Isolation | ERG 138: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind if fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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
First actions (field-minded)
- 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 1426 — Sodium borohydride HAZMAT RADIO NOTE — UN 1426
Product: Sodium borohydride
Class 4 / Dangerous When Wet / ERG 138
PPE: Level B minimum with SCBA; full face shield and chemical-resistant gloves; avoid moisture contact
ISOLATION: ERG 138: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind if fire
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 1426 — Sodium borohydride
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 138
Appearance: White to grayish-white crystalline or granular powder. Odorless or slight amine-like odor. Hygroscopic solid at room temperature.
Water Reactivity: Reacts with water to release flammable hydrogen gas; reaction accelerates with acids or heat. Keep dry.
Extinguishing: Dry chemical (Class D if available), dry sand, soda ash; DO NOT use water, foam, CO2, or halogenated agents
PPE: Level B minimum with SCBA; full face shield and chemical-resistant gloves; avoid moisture contact
Isolation: ERG 138: isolate spill 25m all directions; large spill isolate 50m, consider evacuation 300m downwind if fire
— 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/1426 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1426 Sodium borohydride Cls4 ERG138 | ERG 138: isolate spill 25m all directions; large spill isolate 50m, consider eva | allfirefighter.com/hazmat/un/1426SMS / 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/1426
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FAQ
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 face shield and chemical-resistant gloves; avoid moisture contact
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.