☣️ UN 3519 • CLASS 2
Boron trifluoride, adsorbed
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 3519
Class: 2
Placard type: Toxic Gas
ERG: Guide 173 (check current ERG)
Isolation: ERG 173: Initial isolation 100m in all directions. Protective action distance 0.5km (day) to 1.1km (night) for small spills; 1.4km (day) to 4.2km (night) for large spills.
Chemical & Response Details
| Also known as | Boron trifluorideBF3TrifluoroboraneBoron fluorideTrifluoroboron |
| CAS Number | 7637-07-2 |
| Appearance | Colorless gas with a pungent, suffocating odor. When adsorbed, typically on activated carbon or other solid media. Non-flammable but highly toxic and corrosive. |
| Flash Point | Not applicable (non-flammable gas) |
| Boiling Point | -100.3C (-148.5F) |
| Vapor Density | 2.4 (heavier than air) |
| Water Reactivity | Reacts violently with water producing toxic and corrosive hydrogen fluoride (HF) and boric acid. Do not use water directly on material. |
| Extinguishing | Dry chemical, CO2. Do not use water or foam directly on material. Water spray may be used to cool containers from a distance. |
| PPE | ⚠️ Level A required for gas release or unknown concentrations. Full-face SCBA, chemical-resistant suit with gloves and boots. Avoid skin contact and inhalation at all costs. |
| Isolation | ERG 173: Initial isolation 100m in all directions. Protective action distance 0.5km (day) to 1.1km (night) for small spills; 1.4km (day) to 4.2km (night) for large spills. |
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.
- Vapors may be irritating.
- Contact with gas may cause burns and injury.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Some gases may burn or be ignited by heat, sparks or flames.
- May form explosive mixtures with air.
- Oxidizers may ignite combustibles (wood, paper, oil, clothing, etc.) but NOT readily due to low
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.
- See Table 1 - Initial Isolation and Protective Action Distances.
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UN 3519 — Boron trifluoride, adsorbed HAZMAT RADIO NOTE — UN 3519
Product: Boron trifluoride, adsorbed
Class 2 / Toxic Gas / ERG 173
PPE: Level A required for gas release or unknown concentrations. Full-face SCBA, chemical-resistant suit with gloves and boots. Avoid skin contact and inhalation at all costs.
ISOLATION: ERG 173: Initial isolation 100m in all directions. Protective action distance 0.5km (day) to 1.1km (night) for small spills; 1.4km (day) to 4.2km (night) for large spills.
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 3519 — Boron trifluoride, adsorbed
Class: 2 | Placard: Toxic Gas | ERG Guide: 173
Appearance: Colorless gas with a pungent, suffocating odor. When adsorbed, typically on activated carbon or other solid media. Non-flammable but highly toxic and corrosive.
Water Reactivity: Reacts violently with water producing toxic and corrosive hydrogen fluoride (HF) and boric acid. Do not use water directly on material.
Extinguishing: Dry chemical, CO2. Do not use water or foam directly on material. Water spray may be used to cool containers from a distance.
PPE: Level A required for gas release or unknown concentrations. Full-face SCBA, chemical-resistant suit with gloves and boots. Avoid skin contact and inhalation at all costs.
Isolation: ERG 173: Initial isolation 100m in all directions. Protective action distance 0.5km (day) to 1.1km (night) for small spills; 1.4km (day) to 4.2km (night) for large spills.
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin.
• Vapors may be irritating.
• Contact with gas may cause burns and injury.
— 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/3519 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3519 Boron trifluoride, adsorbed Cls2 ERG173 | allfirefighter.com/hazmat/un/3519SMS / 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/3519
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FAQ
TOXIC; may be fatal if inhaled or absorbed through skin. Vapors may be irritating. Contact with gas may cause burns and injury. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Some gases may burn or be ignited by heat, sparks or flames. May form explosive mixtures with air. Oxidizers may ignite combustibles (wood, paper, oil, clothing, etc.) but NOT readily due to low
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 gas release or unknown concentrations. Full-face SCBA, chemical-resistant suit with gloves and boots. Avoid skin contact and inhalation at all costs.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 173 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.