☣️ UN 1742 • CLASS 8
UN 1742 — Boron trifluoride acetic acid complex, liquid
Placard: Corrosive. ERG Guide 157. 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.
Advertisement
UN 1742 Quick Details
UN 1742
Product name: Boron trifluoride acetic acid complex, liquid
DOT Class: 8
Placard type: Corrosive
ERG Guide: 157 (check current ERG)
Initial isolation: ERG 157: Isolate spill area immediate 50m in all directions; evacuate 300m downwind if material is on fire or releasing vapors
Common Hazards of UN 1742
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
- Reaction with water or moist air may release toxic, corrosive or flammable gases.
- Reaction with water may generate much heat that will increase the concentration of fumes in the air.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above
- Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
Chemical Identity & Physical Properties
| Also known as | Boron trifluoride acetateBF3 acetic acid complexTrifluoroborane acetic acid complexBoron fluoride acetic acid adduct |
| CAS Number | 373-61-5 |
| Appearance | Clear to pale yellow liquid with a pungent, acrid odor. Fuming in moist air due to reaction with atmospheric moisture. |
| Flash Point | 40C (104F) |
| Boiling Point | Approximately 120-125C (248-257F) with decomposition |
| Vapor Density | Heavier than air (vapors sink and accumulate in low areas) |
| Water Reactivity | Reacts with water releasing toxic and corrosive hydrogen fluoride and acetic acid fumes; generates heat |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1742
Extinguishing Media
Dry chemical, CO2, or dry sand; avoid water-based agents due to violent reaction
PPE Requirements
⚠️ Level B minimum required; SCBA and full chemical-resistant suit; rubber or neoprene gloves; face shield and eye protection mandatory
Isolation & Evacuation
ERG 157: Isolate spill area immediate 50m in all directions; evacuate 300m downwind if material is on fire or releasing vapors
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 157).
First Actions for a UN 1742 Incident
- 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
- 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
Advertisement
📋 Copy & Share Field Card
UN 1742 — Boron trifluoride acetic acid complex, lHAZMAT RADIO NOTE — UN 1742
Product: Boron trifluoride acetic acid complex, liquid
Class 8 / Corrosive / ERG 157
PPE: Level B minimum required; SCBA and full chemical-resistant suit; rubber or neoprene gloves; face shield and eye protection mandatory
ISOLATION: ERG 157: Isolate spill area immediate 50m in all directions; evacuate 300m downwind if material is on fire or releasing vapors
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 1742 — Boron trifluoride acetic acid complex, liquid
Class: 8 | Placard: Corrosive | ERG Guide: 157
Appearance: Clear to pale yellow liquid with a pungent, acrid odor. Fuming in moist air due to reaction with atmospheric moisture.
Water Reactivity: Reacts with water releasing toxic and corrosive hydrogen fluoride and acetic acid fumes; generates heat
Extinguishing: Dry chemical, CO2, or dry sand; avoid water-based agents due to violent reaction
PPE: Level B minimum required; SCBA and full chemical-resistant suit; rubber or neoprene gloves; face shield and eye protection mandatory
Isolation: ERG 157: Isolate spill area immediate 50m in all directions; evacuate 300m downwind if material is on fire or releasing vapors
— Key Hazards —
• TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
• Reaction with water or moist air may release toxic, corrosive or flammable gases.
• Reaction with water may generate much heat that will increase the concentration of fumes in the 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/1742 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1742 Boron trifluoride acetic acid complex, liquid Cls8 ERG157 | allfirefighter.com/hazmat/un/1742SMS / 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/1742
Advertisement
Frequently Asked Questions about UN 1742
TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance Reaction with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive UN1802, UN2032, UN3084, UN3093, UN1796 (above 50%), UN1826 (above 50%), and UN2031 (above Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.).
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 required; SCBA and full chemical-resistant suit; rubber or neoprene gloves; face shield and eye protection mandatory
Water reactivity: Reacts with water releasing toxic and corrosive hydrogen fluoride and acetic acid fumes; generates heat. Recommended extinguishing: Dry chemical, CO2, or dry sand; avoid water-based agents due to violent reaction.
ERG Guide 157 recommendation: ERG 157: Isolate spill area immediate 50m in all directions; evacuate 300m downwind if material is on fire or releasing vapors
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 157 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.