☣️ UN 1836 • CLASS 8
UN 1836 — Thionyl chloride
Placard: Corrosive. ERG Guide 137. 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 1836 Quick Details
UN 1836
Product name: Thionyl chloride
DOT Class: 8
Placard type: Corrosive
ERG Guide: 137 (check current ERG)
Initial isolation: ERG 137: Isolate spill 50m (150ft) all directions. If tank/rail car involved in fire, isolate 800m (0.5 mile) and consider evacuation.
Common Hazards of UN 1836
- CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
- Fire will produce irritating, corrosive and/or toxic gases.
- Reaction with water may generate much heat that will increase the concentration of fumes in the air.
- Contact with molten substance may cause severe burns to skin and eyes.
- Runoff from fire control or dilution water may cause environmental contamination.
- EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff.
Chemical Identity & Physical Properties
| Also known as | Sulfinyl chlorideSulfur oxychlorideThionyl dichlorideSOCl2 |
| CAS Number | 7719-09-7 |
| Appearance | Colorless to pale yellow fuming liquid with a pungent, suffocating odor. Fumes heavily in moist air due to reaction with atmospheric moisture. |
| Flash Point | Not applicable (non-flammable liquid) |
| Boiling Point | 76°C (169°F) |
| Vapor Density | 4.1 (heavier than air) |
| Water Reactivity | Reacts violently with water, producing sulfur dioxide and hydrochloric acid fumes with heat evolution. 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 1836
Extinguishing Media
Dry chemical, dry sand, soda ash. DO NOT use water, foam, or water-based agents directly on spills.
PPE Requirements
⚠️ Level B minimum required; SCBA mandatory. Full chemical-resistant suit, butyl rubber gloves. Avoid any skin or eye contact — severe corrosive burns likely.
Isolation & Evacuation
ERG 137: Isolate spill 50m (150ft) all directions. If tank/rail car involved in fire, isolate 800m (0.5 mile) and consider evacuation.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 137).
First Actions for a UN 1836 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 1836 — Thionyl chlorideHAZMAT RADIO NOTE — UN 1836
Product: Thionyl chloride
Class 8 / Corrosive / ERG 137
PPE: Level B minimum required; SCBA mandatory. Full chemical-resistant suit, butyl rubber gloves. Avoid any skin or eye contact — severe corrosive burns likely.
ISOLATION: ERG 137: Isolate spill 50m (150ft) all directions. If tank/rail car involved in fire, isolate 800m (0.5 mile) and consider evacuation.
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 1836 — Thionyl chloride
Class: 8 | Placard: Corrosive | ERG Guide: 137
Appearance: Colorless to pale yellow fuming liquid with a pungent, suffocating odor. Fumes heavily in moist air due to reaction with atmospheric moisture.
Water Reactivity: Reacts violently with water, producing sulfur dioxide and hydrochloric acid fumes with heat evolution. DO NOT use water directly on material.
Extinguishing: Dry chemical, dry sand, soda ash. DO NOT use water, foam, or water-based agents directly on spills.
PPE: Level B minimum required; SCBA mandatory. Full chemical-resistant suit, butyl rubber gloves. Avoid any skin or eye contact — severe corrosive burns likely.
Isolation: ERG 137: Isolate spill 50m (150ft) all directions. If tank/rail car involved in fire, isolate 800m (0.5 mile) and consider evacuation.
— Key Hazards —
• CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance
• Fire will produce irritating, corrosive and/or toxic gases.
• Reaction with water may generate much heat that will increase the concentration of fumes in the 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/1836 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1836 Thionyl chloride Cls8 ERG137 | ERG 137: Isolate spill 50m (150ft) all directions. If tank/rail car involved in | allfirefighter.com/hazmat/un/1836SMS / 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/1836
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Frequently Asked Questions about UN 1836
CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance Fire will produce irritating, corrosive and/or toxic gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Contact with molten substance may cause severe burns to skin and eyes. Runoff from fire control or dilution water may cause environmental contamination. EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may May ignite combustibles (wood, paper, oil, clothing, etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff.
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 required; SCBA mandatory. Full chemical-resistant suit, butyl rubber gloves. Avoid any skin or eye contact — severe corrosive burns likely.
Water reactivity: Reacts violently with water, producing sulfur dioxide and hydrochloric acid fumes with heat evolution. DO NOT use water directly on material.. Recommended extinguishing: Dry chemical, dry sand, soda ash. DO NOT use water, foam, or water-based agents directly on spills..
ERG Guide 137 recommendation: ERG 137: Isolate spill 50m (150ft) all directions. If tank/rail car involved in fire, isolate 800m (0.5 mile) and consider evacuation.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 137 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.