☣️ UN 1911 • CLASS 2
Diborane mixtures
Placard: Flammable Gas. 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 1911
Class: 2
Placard type: Flammable Gas
ERG: Guide 119 (check current ERG)
Isolation: ERG 119: isolate 800m all directions initially; evacuate 1600m downwind if tank/rail car involved in fire
Chemical & Response Details
| Also known as | DiboraneBoron hydrideDiborane(6)Boroethane |
| CAS Number | 19287-45-7 |
| Appearance | Colorless gas with a repulsive, sweet odor. Shipped as a liquefied compressed gas or in mixtures with inert gases. |
| Flash Point | Not applicable (pyrophoric gas, ignites spontaneously in air) |
| Boiling Point | -92.5C (-134.5F) |
| Vapor Density | 0.96 (lighter than air) |
| Water Reactivity | Reacts violently with water, releasing hydrogen and boric acid; do not use water directly on leaks |
| Extinguishing | Dry chemical, CO2, or inert gas blanketing; do not use water or foam on leaks |
| PPE | ⚠️ Level A required for leak response; SCBA and fully encapsulating suit; extremely toxic by inhalation |
| Isolation | ERG 119: isolate 800m all directions initially; evacuate 1600m downwind if tank/rail car involved in fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Flammable; may be ignited by heat, sparks or flames.
- May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
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.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- 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 1911 — Diborane mixtures HAZMAT RADIO NOTE — UN 1911
Product: Diborane mixtures
Class 2 / Flammable Gas / ERG 119
PPE: Level A required for leak response; SCBA and fully encapsulating suit; extremely toxic by inhalation
ISOLATION: ERG 119: isolate 800m all directions initially; evacuate 1600m downwind if tank/rail car involved in 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 1911 — Diborane mixtures
Class: 2 | Placard: Flammable Gas | ERG Guide: 119
Appearance: Colorless gas with a repulsive, sweet odor. Shipped as a liquefied compressed gas or in mixtures with inert gases.
Water Reactivity: Reacts violently with water, releasing hydrogen and boric acid; do not use water directly on leaks
Extinguishing: Dry chemical, CO2, or inert gas blanketing; do not use water or foam on leaks
PPE: Level A required for leak response; SCBA and fully encapsulating suit; extremely toxic by inhalation
Isolation: ERG 119: isolate 800m all directions initially; evacuate 1600m downwind if tank/rail car involved in fire
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
• Fire will produce irritating, corrosive and/or toxic gases.
— 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.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1911 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1911 Diborane mixtures Cls2 ERG119 | ERG 119: isolate 800m all directions initially; evacuate 1600m downwind if tank/ | allfirefighter.com/hazmat/un/1911SMS / 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/1911
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FAQ
TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground.
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 A required for leak response; SCBA and fully encapsulating suit; extremely toxic by inhalation
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 119 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.