☣️ UN 2050 • CLASS 3
UN 2050 — Diisobutylene, isomeric compounds
Placard: Flammable. ERG Guide 128. 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 2050 Quick Details
UN 2050
Product name: Diisobutylene, isomeric compounds
DOT Class: 3
Placard type: Flammable
ERG Guide: 128 (check current ERG)
Initial isolation: ERG 128: isolate spill area 50m all directions; for large spills isolate 150m; evacuate downwind area if fire threatens containers
Common Hazards of UN 2050
- 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 | 2,4,4-TrimethylpenteneDiisobuteneOctyleneTriisobutylene (mixed isomers)DIB |
| CAS Number | 25167-70-8 |
| Appearance | Colorless liquid with a mild, petroleum-like odor. Liquid at room temperature with low viscosity. |
| Flash Point | -6C (21F) |
| Boiling Point | 101-104C (214-219F) |
| Vapor Density | 3.9 (heavier than air) |
| Water Reactivity | No significant reaction; insoluble in water, floats on surface |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2050
Extinguishing Media
AFFF foam, alcohol-resistant foam, dry chemical, CO2
PPE Requirements
⚠️ Level B minimum for spill response; SCBA required in confined spaces or fire situations; chemical-resistant gloves and clothing
Isolation & Evacuation
ERG 128: isolate spill area 50m all directions; for large spills isolate 150m; evacuate downwind area if fire threatens containers
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 128).
First Actions for a UN 2050 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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UN 2050 — Diisobutylene, isomeric compoundsHAZMAT RADIO NOTE — UN 2050
Product: Diisobutylene, isomeric compounds
Class 3 / Flammable / ERG 128
PPE: Level B minimum for spill response; SCBA required in confined spaces or fire situations; chemical-resistant gloves and clothing
ISOLATION: ERG 128: isolate spill area 50m all directions; for large spills isolate 150m; evacuate downwind area if fire threatens containers
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 2050 — Diisobutylene, isomeric compounds
Class: 3 | Placard: Flammable | ERG Guide: 128
Appearance: Colorless liquid with a mild, petroleum-like odor. Liquid at room temperature with low viscosity.
Water Reactivity: No significant reaction; insoluble in water, floats on surface
Extinguishing: AFFF foam, alcohol-resistant foam, dry chemical, CO2
PPE: Level B minimum for spill response; SCBA required in confined spaces or fire situations; chemical-resistant gloves and clothing
Isolation: ERG 128: isolate spill area 50m all directions; for large spills isolate 150m; evacuate downwind area if fire threatens containers
— 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/2050 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2050 Diisobutylene, isomeric compounds Cls3 ERG128 | allfirefighter.com/hazmat/un/2050SMS / 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/2050
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Frequently Asked Questions about UN 2050
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 for spill response; SCBA required in confined spaces or fire situations; chemical-resistant gloves and clothing
Water reactivity: No significant reaction; insoluble in water, floats on surface. Recommended extinguishing: AFFF foam, alcohol-resistant foam, dry chemical, CO2.
ERG Guide 128 recommendation: ERG 128: isolate spill area 50m all directions; for large spills isolate 150m; evacuate downwind area if fire threatens containers
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 128 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.