☣️ UN 2502 • CLASS 8
UN 2502 — Valeryl chloride
Placard: Corrosive. ERG Guide 132. 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 2502 Quick Details
UN 2502
Product name: Valeryl chloride
DOT Class: 8
Placard type: Corrosive
ERG Guide: 132 (check current ERG)
Initial isolation: ERG 132: Isolate spill 50m in all directions. For large spills, consider initial evacuation 300m downwind.
Common Hazards of UN 2502
- Flammable/combustible material.
- May be 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.
Chemical Identity & Physical Properties
| Also known as | Pentanoyl chlorideValeric acid chloriden-Valeryl chloridePentanoic acid chloride |
| CAS Number | 638-29-9 |
| Appearance | Clear to pale yellow liquid with a pungent, irritating odor. Corrosive liquid that fumes in moist air. |
| Flash Point | 26C (79F) |
| Boiling Point | 124-127C (255-261F) |
| Vapor Density | 4.1 (heavier than air) |
| Water Reactivity | Reacts violently with water, releasing heat and corrosive HCl 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 2502
Extinguishing Media
Dry chemical, CO2, dry sand. Alcohol-resistant foam may be used at distance. No water spray directly on liquid.
PPE Requirements
⚠️ Level B minimum with full chemical-resistant suit. SCBA required. Butyl or Viton gloves recommended.
Isolation & Evacuation
ERG 132: Isolate spill 50m in all directions. For large spills, consider initial evacuation 300m downwind.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 132).
First Actions for a UN 2502 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.
- 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 2502 — Valeryl chlorideHAZMAT RADIO NOTE — UN 2502
Product: Valeryl chloride
Class 8 / Corrosive / ERG 132
PPE: Level B minimum with full chemical-resistant suit. SCBA required. Butyl or Viton gloves recommended.
ISOLATION: ERG 132: Isolate spill 50m in all directions. For large spills, consider initial evacuation 300m downwind.
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 2502 — Valeryl chloride
Class: 8 | Placard: Corrosive | ERG Guide: 132
Appearance: Clear to pale yellow liquid with a pungent, irritating odor. Corrosive liquid that fumes in moist air.
Water Reactivity: Reacts violently with water, releasing heat and corrosive HCl fumes. Do not use water directly on material.
Extinguishing: Dry chemical, CO2, dry sand. Alcohol-resistant foam may be used at distance. No water spray directly on liquid.
PPE: Level B minimum with full chemical-resistant suit. SCBA required. Butyl or Viton gloves recommended.
Isolation: ERG 132: Isolate spill 50m in all directions. For large spills, consider initial evacuation 300m downwind.
— Key Hazards —
• Flammable/combustible material.
• May be ignited by heat, sparks or flames.
• Vapors may form explosive mixtures with air.
— 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/2502 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2502 Valeryl chloride Cls8 ERG132 | ERG 132: Isolate spill 50m in all directions. For large spills, consider initial | allfirefighter.com/hazmat/un/2502SMS / 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/2502
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Frequently Asked Questions about UN 2502
Flammable/combustible material. May be 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.
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 full chemical-resistant suit. SCBA required. Butyl or Viton gloves recommended.
Water reactivity: Reacts violently with water, releasing heat and corrosive HCl fumes. Do not use water directly on material.. Recommended extinguishing: Dry chemical, CO2, dry sand. Alcohol-resistant foam may be used at distance. No water spray directly on liquid..
ERG Guide 132 recommendation: ERG 132: Isolate spill 50m in all directions. For large spills, consider initial evacuation 300m downwind.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 132 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.