☣️ UN 1582 • CLASS 2
UN 1582 — Chloropicrin and methyl chloride mixture
Placard: Toxic Gas. ERG Guide 119. 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 1582 Quick Details
UN 1582
Product name: Chloropicrin and methyl chloride mixture
DOT Class: 2
Placard type: Toxic Gas
ERG Guide: 119 (check current ERG)
Initial isolation: ERG 119: Initial isolation 100m in all directions; protective action distance 800m downwind for large spill; evacuate immediate area for leaks or fires
Common Hazards of UN 1582
- TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire will produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may cause environmental contamination.
- Flammable; may be ignited by heat, sparks or flames.
- May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the
- Those substances designated with a (P) may polymerize explosively when heated or involved in a fire.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
Chemical Identity & Physical Properties
| Also known as | Chloropicrin-methyl chloride blendNitrotrichloromethane and chloromethane mixturePS and methyl chloride mixTrichloronitromethane-CH3Cl blend |
| Appearance | Colorless to slightly yellow liquefied gas mixture under pressure. Pungent, irritating odor. Exists as liquid when compressed or refrigerated, releases gas at atmospheric pressure. |
| Flash Point | Not applicable (liquefied gas mixture) |
| Boiling Point | Variable depending on mixture ratio; methyl chloride component boils at -24°C (-11°F) |
| Vapor Density | 3.5-4.0 (heavier than air, both components denser than air) |
| Water Reactivity | Chloropicrin component hydrolyzes slowly in water producing acidic products; avoid water contact |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1582
Extinguishing Media
Do not use water directly; dry chemical, CO2, or inert gas suitable for gas fires
PPE Requirements
⚠️ Level A required for release response; SCBA with full face protection mandatory; chemical-resistant suit essential due to extreme skin absorption hazard
Isolation & Evacuation
ERG 119: Initial isolation 100m in all directions; protective action distance 800m downwind for large spill; evacuate immediate area for leaks or fires
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 119).
First Actions for a UN 1582 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.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 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 1582 — Chloropicrin and methyl chloride mixtureHAZMAT RADIO NOTE — UN 1582
Product: Chloropicrin and methyl chloride mixture
Class 2 / Toxic Gas / ERG 119
PPE: Level A required for release response; SCBA with full face protection mandatory; chemical-resistant suit essential due to extreme skin absorption hazard
ISOLATION: ERG 119: Initial isolation 100m in all directions; protective action distance 800m downwind for large spill; evacuate immediate area for leaks or fires
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 1582 — Chloropicrin and methyl chloride mixture
Class: 2 | Placard: Toxic Gas | ERG Guide: 119
Appearance: Colorless to slightly yellow liquefied gas mixture under pressure. Pungent, irritating odor. Exists as liquid when compressed or refrigerated, releases gas at atmospheric pressure.
Water Reactivity: Chloropicrin component hydrolyzes slowly in water producing acidic products; avoid water contact
Extinguishing: Do not use water directly; dry chemical, CO2, or inert gas suitable for gas fires
PPE: Level A required for release response; SCBA with full face protection mandatory; chemical-resistant suit essential due to extreme skin absorption hazard
Isolation: ERG 119: Initial isolation 100m in all directions; protective action distance 800m downwind for large spill; evacuate immediate area for leaks or fires
— Key Hazards —
• TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and
• Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
• Fire will produce irritating, corrosive and/or toxic gases.
— 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.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/1582 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1582 Chloropicrin and methyl chloride mixture Cls2 ERG119 | allfirefighter.com/hazmat/un/1582SMS / 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/1582
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Frequently Asked Questions about UN 1582
TOXIC; may be fatal if inhaled or absorbed through skin. Some may cause severe skin burns and Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause environmental contamination. Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. Ethylene oxide (UN1040) may react explosively even in the Those substances designated with a (P) may polymerize explosively when heated or involved in a fire. Vapors from liquefied gas are initially heavier than air and spread along ground.
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 A required for release response; SCBA with full face protection mandatory; chemical-resistant suit essential due to extreme skin absorption hazard
Water reactivity: Chloropicrin component hydrolyzes slowly in water producing acidic products; avoid water contact. Recommended extinguishing: Do not use water directly; dry chemical, CO2, or inert gas suitable for gas fires.
ERG Guide 119 recommendation: ERG 119: Initial isolation 100m in all directions; protective action distance 800m downwind for large spill; evacuate immediate area for leaks or fires
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 119 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.