☣️ UN 2535 • CLASS 3
UN 2535 — 4-Methylmorpholine
Placard: Flammable. 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 2535 Quick Details
UN 2535
Product name: 4-Methylmorpholine
DOT Class: 3
Placard type: Flammable
ERG Guide: 132 (check current ERG)
Initial isolation: ERG 132: isolate spill 50m all directions; for large spill isolate 150m and evacuate downwind 300m initially
Common Hazards of UN 2535
- 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 | N-MethylmorpholineNMM4-Methyl-morpholineMorpholine, 4-methyl- |
| CAS Number | 109-02-4 |
| Appearance | Colorless to pale yellow liquid with an ammonia-like or fishy odor at room temperature. |
| Flash Point | 24°C (75°F) |
| Boiling Point | 115-116°C (239-241°F) |
| Vapor Density | 3.5 (heavier than air) |
| Water Reactivity | Soluble in water; no violent reaction but forms alkaline solution |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 2535
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical, water spray
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant gloves and suit due to corrosive amine properties
Isolation & Evacuation
ERG 132: isolate spill 50m all directions; for large spill isolate 150m and evacuate downwind 300m initially
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 132).
First Actions for a UN 2535 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 2535 — 4-MethylmorpholineHAZMAT RADIO NOTE — UN 2535
Product: 4-Methylmorpholine
Class 3 / Flammable / ERG 132
PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit due to corrosive amine properties
ISOLATION: ERG 132: isolate spill 50m all directions; for large spill isolate 150m and evacuate downwind 300m initially
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 2535 — 4-Methylmorpholine
Class: 3 | Placard: Flammable | ERG Guide: 132
Appearance: Colorless to pale yellow liquid with an ammonia-like or fishy odor at room temperature.
Water Reactivity: Soluble in water; no violent reaction but forms alkaline solution
Extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray
PPE: Level B minimum; SCBA required; chemical-resistant gloves and suit due to corrosive amine properties
Isolation: ERG 132: isolate spill 50m all directions; for large spill isolate 150m and evacuate downwind 300m initially
— 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/2535 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN2535 4-Methylmorpholine Cls3 ERG132 | ERG 132: isolate spill 50m all directions; for large spill isolate 150m and evac | allfirefighter.com/hazmat/un/2535SMS / 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/2535
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Frequently Asked Questions about UN 2535
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 due to corrosive amine properties
Water reactivity: Soluble in water; no violent reaction but forms alkaline solution. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical, water spray.
ERG Guide 132 recommendation: ERG 132: isolate spill 50m all directions; for large spill isolate 150m and evacuate downwind 300m initially
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.