☣️ UN 1928 • CLASS 4
UN 1928 — Methyl magnesium bromide in ethyl ether
Placard: Dangerous When Wet. ERG Guide 138. 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 1928 Quick Details
UN 1928
Product name: Methyl magnesium bromide in ethyl ether
DOT Class: 4
Placard type: Dangerous When Wet
ERG Guide: 138 (check current ERG)
Initial isolation: ERG 138: Isolate spill 25m all directions. Initial evacuation 100m all directions. If tank/railcar involved in fire, evacuate 800m radius.
Common Hazards of UN 1928
- Produce flammable gases on contact with water.
- May ignite on contact with water or moist air.
- Some react vigorously or explosively on contact with water.
- May be ignited by heat, sparks or flames.
- May re-ignite after fire is extinguished.
- Some are transported in highly flammable liquids.
- Runoff may create fire or explosion hazard.
- Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
Chemical Identity & Physical Properties
| Also known as | Methylmagnesium bromideBromomethylmagnesiumGrignard reagentMeMgBr in ether |
| CAS Number | 75-16-1 |
| Appearance | Clear to pale yellow liquid solution in ethyl ether. Characteristic ether odor. Highly reactive organometallic compound. |
| Flash Point | -45C (-49F) (ethyl ether solvent) |
| Boiling Point | 35C (95F) (ethyl ether solvent) |
| Vapor Density | 2.6 (heavier than air) |
| Water Reactivity | Reacts violently with water producing flammable methane gas and heat. May ignite spontaneously. |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 1928
Extinguishing Media
Dry chemical, dry sand, or dry powder only. Do NOT use water, foam, or CO2.
PPE Requirements
⚠️ Level B minimum with SCBA required. Full chemical-resistant suit. Prevent skin/eye contact.
Isolation & Evacuation
ERG 138: Isolate spill 25m all directions. Initial evacuation 100m all directions. If tank/railcar involved in fire, evacuate 800m radius.
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 138).
First Actions for a UN 1928 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
- Consider initial downwind evacuation for at least 300 meters (1000 feet).
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📋 Copy & Share Field Card
UN 1928 — Methyl magnesium bromide in ethyl etherHAZMAT RADIO NOTE — UN 1928
Product: Methyl magnesium bromide in ethyl ether
Class 4 / Dangerous When Wet / ERG 138
PPE: Level B minimum with SCBA required. Full chemical-resistant suit. Prevent skin/eye contact.
ISOLATION: ERG 138: Isolate spill 25m all directions. Initial evacuation 100m all directions. If tank/railcar involved in fire, evacuate 800m radius.
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 1928 — Methyl magnesium bromide in ethyl ether
Class: 4 | Placard: Dangerous When Wet | ERG Guide: 138
Appearance: Clear to pale yellow liquid solution in ethyl ether. Characteristic ether odor. Highly reactive organometallic compound.
Water Reactivity: Reacts violently with water producing flammable methane gas and heat. May ignite spontaneously.
Extinguishing: Dry chemical, dry sand, or dry powder only. Do NOT use water, foam, or CO2.
PPE: Level B minimum with SCBA required. Full chemical-resistant suit. Prevent skin/eye contact.
Isolation: ERG 138: Isolate spill 25m all directions. Initial evacuation 100m all directions. If tank/railcar involved in fire, evacuate 800m radius.
— Key Hazards —
• Produce flammable gases on contact with water.
• May ignite on contact with water or moist air.
• Some react vigorously or explosively on contact with water.
— 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/1928 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1928 Methyl magnesium bromide in ethyl ether Cls4 ERG138 | allfirefighter.com/hazmat/un/1928SMS / 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/1928
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Frequently Asked Questions about UN 1928
Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard. Inhalation or contact with vapors, substance or decomposition products may cause severe injury or
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 with SCBA required. Full chemical-resistant suit. Prevent skin/eye contact.
Water reactivity: Reacts violently with water producing flammable methane gas and heat. May ignite spontaneously.. Recommended extinguishing: Dry chemical, dry sand, or dry powder only. Do NOT use water, foam, or CO2..
ERG Guide 138 recommendation: ERG 138: Isolate spill 25m all directions. Initial evacuation 100m all directions. If tank/railcar involved in fire, evacuate 800m radius.
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 138 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.