☣️ UN 2747 • CLASS 6
UN 2747 — tert-Butylcyclohexyl chloroformate
Placard: Toxic. ERG Guide 156. 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 2747 Quick Details
UN 2747
Product name: tert-Butylcyclohexyl chloroformate
DOT Class: 6
Placard type: Toxic
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m; if tank/rail car involved in fire, isolate 800m
Common Hazards of UN 2747
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
- Vapors may travel to source of ignition and flash back.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
Chemical Identity & Physical Properties
| Also known as | tert-Butylcyclohexyl chloroformateChloroformic acid tert-butylcyclohexyl ester4-tert-Butylcyclohexyl chloroformate |
| CAS Number | 60613-16-9 |
| Appearance | Clear to pale yellow liquid with a pungent, acrid odor. Combustible liquid at room temperature. |
| Flash Point | 93C (200F) |
| Boiling Point | Approximately 200-220C (392-428F) with decomposition |
| Vapor Density | 7.2 (heavier than air) |
| Water Reactivity | Reacts with water releasing HCl gas (hydrochloric acid) and corrosive products; avoid water contact |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2747
Extinguishing Media
Dry chemical, CO2, or dry sand preferred; alcohol-resistant foam if necessary; avoid water spray directly on liquid
PPE Requirements
⚠️ Level B minimum with SCBA; full face protection and chemical-resistant suit required due to corrosive vapor hazard
Isolation & Evacuation
ERG 156: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m; if tank/rail car involved in fire, isolate 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 2747 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 2747 — tert-Butylcyclohexyl chloroformateHAZMAT RADIO NOTE — UN 2747
Product: tert-Butylcyclohexyl chloroformate
Class 6 / Toxic / ERG 156
PPE: Level B minimum with SCBA; full face protection and chemical-resistant suit required due to corrosive vapor hazard
ISOLATION: ERG 156: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m; if tank/rail car involved in fire, isolate 800m
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 2747 — tert-Butylcyclohexyl chloroformate
Class: 6 | Placard: Toxic | ERG Guide: 156
Appearance: Clear to pale yellow liquid with a pungent, acrid odor. Combustible liquid at room temperature.
Water Reactivity: Reacts with water releasing HCl gas (hydrochloric acid) and corrosive products; avoid water contact
Extinguishing: Dry chemical, CO2, or dry sand preferred; alcohol-resistant foam if necessary; avoid water spray directly on liquid
PPE: Level B minimum with SCBA; full face protection and chemical-resistant suit required due to corrosive vapor hazard
Isolation: ERG 156: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m; if tank/rail car involved in fire, isolate 800m
— Key Hazards —
• Combustible material: may burn but does not ignite readily.
• Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— 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/2747 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2747 tert-Butylcyclohexyl chloroformate Cls6 ERG156 | allfirefighter.com/hazmat/un/2747SMS / 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/2747
Advertisement
Frequently Asked Questions about UN 2747
Combustible material: may burn but does not ignite readily. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas Vapors may travel to source of ignition and flash back. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
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 with SCBA; full face protection and chemical-resistant suit required due to corrosive vapor hazard
Water reactivity: Reacts with water releasing HCl gas (hydrochloric acid) and corrosive products; avoid water contact. Recommended extinguishing: Dry chemical, CO2, or dry sand preferred; alcohol-resistant foam if necessary; avoid water spray directly on liquid.
ERG Guide 156 recommendation: ERG 156: isolate spill 25m in all directions; for large spills consider initial downwind evacuation 100m; if tank/rail car involved in fire, isolate 800m
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 156 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.