☣️ UN 1235 • CLASS 3
UN 1235 — Methylamine, aqueous solution
Placard: Flammable. ERG Guide 132. 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 1235 Quick Details
UN 1235
Product name: Methylamine, aqueous solution
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 800m downwind during day
Common Hazards of UN 1235
- 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 | MonomethylamineMethanamineAminomethaneMMA solution |
| CAS Number | 74-89-5 |
| Appearance | Colorless to pale yellow aqueous solution with a strong, pungent, fishy ammonia-like odor. Liquid at room temperature. |
| Flash Point | 0C (32F) for 40% solution; -10C (14F) for higher concentrations |
| Boiling Point | Approximately 47-87C (117-189F) depending on concentration |
| Vapor Density | 1.1 (heavier than air) |
| Water Reactivity | Already in aqueous solution; miscible with water in all proportions |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1235
Extinguishing Media
Alcohol-resistant foam, CO2, dry chemical; water spray may reduce vapors
PPE Requirements
⚠️ Level B minimum; SCBA required; chemical-resistant suit and gloves; avoid skin/eye contact
Isolation & Evacuation
ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind during day
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 132).
First Actions for a UN 1235 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 1235 — Methylamine, aqueous solutionHAZMAT RADIO NOTE — UN 1235
Product: Methylamine, aqueous solution
Class 3 / Flammable / ERG 132
PPE: Level B minimum; SCBA required; chemical-resistant suit and gloves; avoid skin/eye contact
ISOLATION: ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind during day
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 1235 — Methylamine, aqueous solution
Class: 3 | Placard: Flammable | ERG Guide: 132
Appearance: Colorless to pale yellow aqueous solution with a strong, pungent, fishy ammonia-like odor. Liquid at room temperature.
Water Reactivity: Already in aqueous solution; miscible with water in all proportions
Extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray may reduce vapors
PPE: Level B minimum; SCBA required; chemical-resistant suit and gloves; avoid skin/eye contact
Isolation: ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind during day
— 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/1235 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1235 Methylamine, aqueous solution Cls3 ERG132 | allfirefighter.com/hazmat/un/1235SMS / 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/1235
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Frequently Asked Questions about UN 1235
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 suit and gloves; avoid skin/eye contact
Water reactivity: Already in aqueous solution; miscible with water in all proportions. Recommended extinguishing: Alcohol-resistant foam, CO2, dry chemical; water spray may reduce vapors.
ERG Guide 132 recommendation: ERG 132: isolate spill 50m all directions; for large spill isolate 800m downwind during day
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.