☣️ UN 1741 • CLASS 2
Boron trichloride
Placard: Toxic Gas. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
🚒☣️
⚠️ 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 1741
Class: 2
Placard type: Toxic Gas
ERG: Guide 125 (check current ERG)
Isolation: ERG 125: Initial isolation 100m all directions; protective action distance 300m downwind daytime, 600m downwind nighttime for small spills. Larger spills require greater distances.
Chemical & Response Details
| Also known as | Boron chlorideTrichloroboraneTrichloroboronBCl3 |
| CAS Number | 10294-34-5 |
| Appearance | Colorless gas or fuming liquid with a pungent, irritating odor. Exists as a gas at room temperature but may be shipped as a liquefied compressed gas. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | 12.5C (54.5F) |
| Vapor Density | 4.0 (heavier than air) |
| Water Reactivity | Reacts violently with water producing toxic and corrosive fumes of hydrochloric acid and boric acid. Do not use water. |
| Extinguishing | Dry chemical, CO2, dry sand. Do not use water or foam. |
| PPE | ⚠️ Level A with SCBA required; full chemical-protective clothing to prevent contact with gas or liquid. Gas is highly toxic and corrosive. |
| Isolation | ERG 125: Initial isolation 100m all directions; protective action distance 300m downwind daytime, 600m downwind nighttime for small spills. Larger spills require greater distances. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
- Vapors are extremely irritating and corrosive.
- 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.
- Some may burn but none ignite readily.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Some of these materials may react violently with water.
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 1741 — Boron trichloride HAZMAT RADIO NOTE — UN 1741
Product: Boron trichloride
Class 2 / Toxic Gas / ERG 125
PPE: Level A with SCBA required; full chemical-protective clothing to prevent contact with gas or liquid. Gas is highly toxic and corrosive.
ISOLATION: ERG 125: Initial isolation 100m all directions; protective action distance 300m downwind daytime, 600m downwind nighttime for small spills. Larger spills require greater distances.
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 1741 — Boron trichloride
Class: 2 | Placard: Toxic Gas | ERG Guide: 125
Appearance: Colorless gas or fuming liquid with a pungent, irritating odor. Exists as a gas at room temperature but may be shipped as a liquefied compressed gas.
Water Reactivity: Reacts violently with water producing toxic and corrosive fumes of hydrochloric acid and boric acid. Do not use water.
Extinguishing: Dry chemical, CO2, dry sand. Do not use water or foam.
PPE: Level A with SCBA required; full chemical-protective clothing to prevent contact with gas or liquid. Gas is highly toxic and corrosive.
Isolation: ERG 125: Initial isolation 100m all directions; protective action distance 300m downwind daytime, 600m downwind nighttime for small spills. Larger spills require greater distances.
— Key Hazards —
• TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin.
• Vapors are extremely irritating and corrosive.
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
— 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/1741 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1741 Boron trichloride Cls2 ERG125 | ERG 125: Initial isolation 100m all directions; protective action distance 300m | allfirefighter.com/hazmat/un/1741SMS / 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/1741
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FAQ
TOXIC and/or CORROSIVE; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. 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. Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water.
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 with SCBA required; full chemical-protective clothing to prevent contact with gas or liquid. Gas is highly toxic and corrosive.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 125 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.