☣️ UN 1160 • CLASS 3
Dimethylamine, aqueous solution
Placard: Flammable. 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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Quick details
UN 1160
Class: 3
Placard type: Flammable
ERG: Guide 132 (check current ERG)
Isolation: ERG 132: Small spill isolate 30m all directions; large spill isolate 150m, evacuate 800m downwind if tank/rail car involved in fire
Chemical & Response Details
| Also known as | DMAN-MethylmethanamineDimethylamine solutionMethanamine N-methyl- |
| CAS Number | 124-40-3 |
| Appearance | Colorless to yellow liquid with a strong ammonia-like or fishy odor. Aqueous solution typically contains 25-40% dimethylamine by weight. |
| Flash Point | -18C (0F) for typical 40% solution |
| Boiling Point | 7C (45F) for pure dimethylamine; varies with concentration |
| Vapor Density | 1.6 (heavier than air) |
| Water Reactivity | Already in aqueous solution; miscible with water |
| Extinguishing | Alcohol-resistant foam, dry chemical, CO2; water spray to cool containers |
| PPE | ⚠️ Level B minimum; SCBA required; chemical-resistant gloves and suit; face shield |
| Isolation | ERG 132: Small spill isolate 30m all directions; large spill isolate 150m, evacuate 800m downwind if tank/rail car involved in fire |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- 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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UN 1160 — Dimethylamine, aqueous solution HAZMAT RADIO NOTE — UN 1160
Product: Dimethylamine, aqueous solution
Class 3 / Flammable / ERG 132
PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit; face shield
ISOLATION: ERG 132: Small spill isolate 30m all directions; large spill isolate 150m, evacuate 800m downwind if tank/rail car involved in fire
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 1160 — Dimethylamine, aqueous solution
Class: 3 | Placard: Flammable | ERG Guide: 132
Appearance: Colorless to yellow liquid with a strong ammonia-like or fishy odor. Aqueous solution typically contains 25-40% dimethylamine by weight.
Water Reactivity: Already in aqueous solution; miscible with water
Extinguishing: Alcohol-resistant foam, dry chemical, CO2; water spray to cool containers
PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit; face shield
Isolation: ERG 132: Small spill isolate 30m all directions; large spill isolate 150m, evacuate 800m downwind if tank/rail car involved in fire
— 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/1160 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1160 Dimethylamine, aqueous solution Cls3 ERG132 | allfirefighter.com/hazmat/un/1160SMS / 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/1160
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FAQ
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; SCBA required; chemical-resistant gloves and suit; face shield
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.