☣️ UN 2395 • CLASS 3
UN 2395 — Isobutyryl chloride
Placard: Flammable. ERG Guide 155. 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.
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UN 2395 Quick Details
UN 2395
Product name: Isobutyryl chloride
DOT Class: 3
Placard type: Flammable
ERG Guide: 155 (check current ERG)
Initial isolation: ERG 155: Isolate spill 50m all directions; for large spills isolate 150m initially, evacuate 800m downwind if fire or major release
Common Hazards of UN 2395
- HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
- Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
- 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.
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
Chemical Identity & Physical Properties
| Also known as | 2-Methylpropanoyl chlorideDimethylacetyl chlorideIsobutyric acid chloride2-Methyl-1-propanoyl chloride |
| CAS Number | 79-30-1 |
| Appearance | Colorless to pale yellow liquid with a pungent, acrid odor. Fumes in moist air due to reaction with water vapor. |
| Flash Point | -12°C (10°F) |
| Boiling Point | 92°C (198°F) |
| Vapor Density | 3.6 (heavier than air) |
| Water Reactivity | Reacts violently with water, generating heat and hydrochloric acid fumes. Do not use water directly on material. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2395
Extinguishing Media
Dry chemical, CO2, or dry sand; avoid water-based agents due to violent reaction
PPE Requirements
⚠️ Level B minimum with SCBA; full chemical-resistant suit recommended. Avoid all skin and eye contact due to corrosive fumes.
Isolation & Evacuation
ERG 155: Isolate spill 50m all directions; for large spills isolate 150m initially, evacuate 800m downwind if fire or major release
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 155).
First Actions for a UN 2395 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
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📋 Copy & Share Field Card
UN 2395 — Isobutyryl chlorideHAZMAT RADIO NOTE — UN 2395
Product: Isobutyryl chloride
Class 3 / Flammable / ERG 155
PPE: Level B minimum with SCBA; full chemical-resistant suit recommended. Avoid all skin and eye contact due to corrosive fumes.
ISOLATION: ERG 155: Isolate spill 50m all directions; for large spills isolate 150m initially, evacuate 800m downwind if fire or major release
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 2395 — Isobutyryl chloride
Class: 3 | Placard: Flammable | ERG Guide: 155
Appearance: Colorless to pale yellow liquid with a pungent, acrid odor. Fumes in moist air due to reaction with water vapor.
Water Reactivity: Reacts violently with water, generating heat and hydrochloric acid fumes. Do not use water directly on material.
Extinguishing: Dry chemical, CO2, or dry sand; avoid water-based agents due to violent reaction
PPE: Level B minimum with SCBA; full chemical-resistant suit recommended. Avoid all skin and eye contact due to corrosive fumes.
Isolation: ERG 155: Isolate spill 50m all directions; for large spills isolate 150m initially, evacuate 800m downwind if fire or major release
— Key Hazards —
• HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
• Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
• Most vapors are heavier than air. They will spread along the ground and collect in low or confined areas
— 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/2395 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2395 Isobutyryl chloride Cls3 ERG155 | ERG 155: Isolate spill 50m all directions; for large spills isolate 150m initial | allfirefighter.com/hazmat/un/2395SMS / 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/2395
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Frequently Asked Questions about UN 2395
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. 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. Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. Corrosives in contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.
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 chemical-resistant suit recommended. Avoid all skin and eye contact due to corrosive fumes.
Water reactivity: Reacts violently with water, generating heat and hydrochloric acid fumes. Do not use water directly on material.. Recommended extinguishing: Dry chemical, CO2, or dry sand; avoid water-based agents due to violent reaction.
ERG Guide 155 recommendation: ERG 155: Isolate spill 50m all directions; for large spills isolate 150m initially, evacuate 800m downwind if fire or major release
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 155 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.