☣️ UN 3054 • CLASS 3
UN 3054 — Cyclohexyl mercaptan
Placard: Flammable. ERG Guide 129. 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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UN 3054 Quick Details
UN 3054
Product name: Cyclohexyl mercaptan
DOT Class: 3
Placard type: Flammable
ERG Guide: 129 (check current ERG)
Initial isolation: ERG 129: Initial isolation 50m all directions; protective action distance 300m downwind during spill; evacuate area and deny entry
Common Hazards of UN 3054
- 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.
Chemical Identity & Physical Properties
| Also known as | CyclohexanethiolCyclohexyl thiolMercaptocyclohexaneCyclohexyl hydrosulfide |
| CAS Number | 1569-69-3 |
| Appearance | Colorless to pale yellow liquid with a strong, unpleasant sulfur or skunk-like odor. Oily consistency at room temperature. |
| Flash Point | 43°C (109°F) |
| Boiling Point | 158-159°C (316-318°F) |
| Vapor Density | 4.0 (heavier than air) |
| Water Reactivity | No significant reaction with water; immiscible and floats on water surface |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3054
Extinguishing Media
Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE Requirements
⚠️ Level B minimum with SCBA required; chemical-resistant gloves and boots; extreme odor at very low concentrations requires respiratory protection
Isolation & Evacuation
ERG 129: Initial isolation 50m all directions; protective action distance 300m downwind during spill; evacuate area and deny entry
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 129).
First Actions for a UN 3054 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 for at least 50 meters (150 feet) in all directions.
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
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📋 Copy & Share Field Card
UN 3054 — Cyclohexyl mercaptanHAZMAT RADIO NOTE — UN 3054
Product: Cyclohexyl mercaptan
Class 3 / Flammable / ERG 129
PPE: Level B minimum with SCBA required; chemical-resistant gloves and boots; extreme odor at very low concentrations requires respiratory protection
ISOLATION: ERG 129: Initial isolation 50m all directions; protective action distance 300m downwind during spill; evacuate area and deny entry
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 3054 — Cyclohexyl mercaptan
Class: 3 | Placard: Flammable | ERG Guide: 129
Appearance: Colorless to pale yellow liquid with a strong, unpleasant sulfur or skunk-like odor. Oily consistency at room temperature.
Water Reactivity: No significant reaction with water; immiscible and floats on water surface
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only
PPE: Level B minimum with SCBA required; chemical-resistant gloves and boots; extreme odor at very low concentrations requires respiratory protection
Isolation: ERG 129: Initial isolation 50m all directions; protective action distance 300m downwind during spill; evacuate area and deny entry
— Key Hazards —
• 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.
— 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/3054 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3054 Cyclohexyl mercaptan Cls3 ERG129 | ERG 129: Initial isolation 50m all directions; protective action distance 300m d | allfirefighter.com/hazmat/un/3054SMS / 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/3054
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Frequently Asked Questions about UN 3054
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 with SCBA required; chemical-resistant gloves and boots; extreme odor at very low concentrations requires respiratory protection
Water reactivity: No significant reaction with water; immiscible and floats on water surface. Recommended extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray for cooling only.
ERG Guide 129 recommendation: ERG 129: Initial isolation 50m all directions; protective action distance 300m downwind during spill; evacuate area and deny entry
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.