☣️ UN 2604 • CLASS 8
Boron trifluoride diethyl etherate
Placard: Corrosive. 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 2604
Class: 8
Placard type: Corrosive
ERG: Guide 132 (check current ERG)
Isolation: ERG 132: isolate spill area 50m in all directions; evacuate 800m downwind if large spill or fire
Chemical & Response Details
| Also known as | Boron trifluoride etherateBF3 diethyl etherateBoron fluoride ethyl ether complexDiethyl etherate of boron trifluoride |
| CAS Number | 109-63-7 |
| Appearance | Clear to pale yellow liquid with a pungent, irritating odor. Fuming in moist air. |
| Flash Point | -18°C (0°F) |
| Boiling Point | 126°C (259°F) |
| Vapor Density | 4.5 (heavier than air) |
| Water Reactivity | Reacts violently with water, releasing toxic and corrosive hydrogen fluoride gas |
| Extinguishing | Dry chemical, CO2, or dry sand; avoid water and water-based foams |
| PPE | ⚠️ Level B minimum; SCBA required; full chemical-resistant suit due to corrosive vapor hazard |
| Isolation | ERG 132: isolate spill area 50m in all directions; evacuate 800m downwind if large spill or fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Flammable/combustible material.
- May be ignited by heat, sparks or flames.
- Vapors may form explosive mixtures with air.
- Vapors may travel to source of ignition and flash back.
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapor explosion hazard indoors, outdoors or in sewers.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Runoff to sewer may create fire or explosion hazard.
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 for at least 50 meters (150 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 2604 — Boron trifluoride diethyl etherate HAZMAT RADIO NOTE — UN 2604
Product: Boron trifluoride diethyl etherate
Class 8 / Corrosive / ERG 132
PPE: Level B minimum; SCBA required; full chemical-resistant suit due to corrosive vapor hazard
ISOLATION: ERG 132: isolate spill area 50m in all directions; evacuate 800m downwind if large spill or 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 2604 — Boron trifluoride diethyl etherate
Class: 8 | Placard: Corrosive | ERG Guide: 132
Appearance: Clear to pale yellow liquid with a pungent, irritating odor. Fuming in moist air.
Water Reactivity: Reacts violently with water, releasing toxic and corrosive hydrogen fluoride gas
Extinguishing: Dry chemical, CO2, or dry sand; avoid water and water-based foams
PPE: Level B minimum; SCBA required; full chemical-resistant suit due to corrosive vapor hazard
Isolation: ERG 132: isolate spill area 50m in all directions; evacuate 800m downwind if large spill or fire
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
— 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/2604 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2604 Boron trifluoride diethyl etherate Cls8 ERG132 | allfirefighter.com/hazmat/un/2604SMS / 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/2604
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FAQ
Flammable/combustible material. May be ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard.
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; SCBA required; full chemical-resistant suit due to corrosive vapor hazard
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 132 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.