☣️ UN 1147 • CLASS 3
Decahydronaphthalene
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 1147
Class: 3
Placard type: Flammable
ERG: Guide 130 (check current ERG)
Isolation: ERG 130: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions
Chemical & Response Details
| Also known as | DecalinBicyclo[4.4.0]decaneNaphthanePerhydronaphthalene |
| CAS Number | 91-17-8 |
| Appearance | Colorless liquid with a mild, aromatic odor. Exists as cis and trans isomers. Oily consistency at room temperature. |
| Flash Point | 58C (136F) |
| Boiling Point | 189-196C (372-385F) depending on isomer |
| Vapor Density | 4.8 (much heavier than air) |
| Water Reactivity | No significant reaction; insoluble in water |
| Extinguishing | Alcohol-resistant foam, CO2, dry chemical, water spray for cooling |
| PPE | ⚠️ Level B minimum in vapor areas; SCBA required in confined spaces or heavy vapor; chemical-resistant gloves and suit |
| Isolation | ERG 130: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions |
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).
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UN 1147 — Decahydronaphthalene HAZMAT RADIO NOTE — UN 1147
Product: Decahydronaphthalene
Class 3 / Flammable / ERG 130
PPE: Level B minimum in vapor areas; SCBA required in confined spaces or heavy vapor; chemical-resistant gloves and suit
ISOLATION: ERG 130: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions
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 1147 — Decahydronaphthalene
Class: 3 | Placard: Flammable | ERG Guide: 130
Appearance: Colorless liquid with a mild, aromatic odor. Exists as cis and trans isomers. Oily consistency at room temperature.
Water Reactivity: No significant reaction; insoluble in water
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray for cooling
PPE: Level B minimum in vapor areas; SCBA required in confined spaces or heavy vapor; chemical-resistant gloves and suit
Isolation: ERG 130: isolate spill 50m all directions; if tank/rail car involved in fire, isolate 800m all directions
— 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/1147 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1147 Decahydronaphthalene Cls3 ERG130 | ERG 130: isolate spill 50m all directions; if tank/rail car involved in fire, is | allfirefighter.com/hazmat/un/1147SMS / 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/1147
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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 in vapor areas; SCBA required in confined spaces or heavy vapor; chemical-resistant gloves and suit
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 130 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.