☣️ UN 1176 • CLASS 3
Ethyl borate
Placard: Flammable. 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 1176
Class: 3
Placard type: Flammable
ERG: Guide 129 (check current ERG)
Verify shipping papers and exact product details; use ERG Guide 129 for initial actions and isolation/evacuation guidance.
Chemical & Response Details
| Also known as | Triethyl borateBoric acid triethyl esterTriethoxyboranEthyl orthoborate |
| CAS Number | 150-46-9 |
| Appearance | Colorless liquid with a mild, characteristic odor. Relatively mobile liquid at room temperature. |
| Flash Point | -12C (10F) |
| Boiling Point | 118C (244F) |
| Vapor Density | 4.0 (heavier than air) |
| Water Reactivity | Hydrolyzes slowly in water producing ethanol and boric acid; reaction is not violent |
| Extinguishing | Alcohol-resistant foam, CO2, dry chemical; water spray for cooling only |
| PPE | ⚠️ Level B minimum; SCBA required in vapor areas; chemical-resistant gloves and suit |
| Isolation | ERG 129: isolate spill 50m all directions; for large spill consider initial evacuation 300m downwind |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- HIGHLY FLAMMABLE: Will be easily 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.
- Containers may explode when heated.
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.
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
Copy / share note
MAYDAY / HAZMAT QUICK NOTE UN 1176 — Ethyl borate Class: 3 | Placard: Flammable ERG: Guide 129 (check current ERG) FIRST ACTIONS: use SOP/SOG + ERG; stage upwind; isolate; deny entry; request Hazmat.
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FAQ
HIGHLY FLAMMABLE: Will be easily 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. Containers may explode when heated.
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 in vapor areas; chemical-resistant gloves and suit
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 129 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.