☣️ UN 1729 • CLASS 8
UN 1729 — Anisoyl chloride
Placard: Corrosive. ERG Guide 156. 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.
Anisoyl chloride is a clear to pale yellow liquid with a pungent, acrid odor that requires special handling and safety precautions.
Hazard overview: Anisoyl chloride is a combustible material that may burn but does not ignite readily. It will react with water to release corrosive and toxic HCl gas.
Response guidance: In case of emergency, isolate the spill area immediately and call the fire department. Use dry chemical, CO2, or dry sand to extinguish fires, and avoid water contact.
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UN 1729 Quick Details
UN 1729
Product name: Anisoyl chloride
DOT Class: 8
Placard type: Corrosive
ERG Guide: 156 (check current ERG)
Initial isolation: ERG 156: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind
Common Hazards of UN 1729
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
- 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.
- Corrosives in contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
Chemical Identity & Physical Properties
Anisoyl chloride is a clear to pale yellow liquid with a pungent, acrid odor that is corrosive and moisture-sensitive.
| Also known as | p-Methoxybenzoyl chloride4-Methoxybenzoyl chloridep-Anisoyl chlorideAnisic acid chloride |
| CAS Number | 100-07-2 |
| Appearance | Clear to pale yellow liquid with a pungent, acrid odor. Corrosive and moisture-sensitive. |
| Flash Point | 118°C (244°F) |
| Boiling Point | 262°C (504°F) |
| Vapor Density | Approximately 5.9 (heavier than air) |
| Water Reactivity | Reacts with water releasing corrosive and toxic HCl gas; avoid direct water contact |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1729
Extinguishing Media
Dry chemical, CO2, dry sand; avoid water-based agents due to reactivity
PPE Requirements
⚠️ Level B minimum; full face SCBA required; acid-resistant suit and gloves mandatory
Level B minimum PPE is required, including full face SCBA, acid-resistant suit, and gloves, due to corrosive and toxic hazards.
Isolation & Evacuation
ERG 156: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 156).
First Actions for a UN 1729 Incident
- 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 1729 — Anisoyl chlorideHAZMAT RADIO NOTE — UN 1729
Product: Anisoyl chloride
Class 8 / Corrosive / ERG 156
PPE: Level B minimum; full face SCBA required; acid-resistant suit and gloves mandatory
ISOLATION: ERG 156: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m 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 1729 — Anisoyl chloride
Class: 8 | Placard: Corrosive | ERG Guide: 156
Appearance: Clear to pale yellow liquid with a pungent, acrid odor. Corrosive and moisture-sensitive.
Water Reactivity: Reacts with water releasing corrosive and toxic HCl gas; avoid direct water contact
Extinguishing: Dry chemical, CO2, dry sand; avoid water-based agents due to reactivity
PPE: Level B minimum; full face SCBA required; acid-resistant suit and gloves mandatory
Isolation: ERG 156: isolate spill 50m all directions; for large spill isolate 150m, evacuate 800m downwind
— Key Hazards —
• Combustible material: may burn but does not ignite readily.
• Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
• When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion
— First Actions —
• 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
SOURCE: allfirefighter.com/hazmat/un/1729 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN1729 Anisoyl chloride Cls8 ERG156 | ERG 156: isolate spill 50m all directions; for large spill isolate 150m, evacuat | allfirefighter.com/hazmat/un/1729SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/anisoyl-chloride-un-1729
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Frequently Asked Questions about UN 1729
Yes, UN 1729 is a combustible material.
Yes, UN 1729 reacts with water to release corrosive and toxic HCl gas.
UN 1729 is a corrosive and combustible substance that can release corrosive and toxic HCl gas when reacting with water.
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.