☣️ UN 3151 • CLASS 9
Halogenated monomethyldiphenylmethanes, liquid
Placard: Miscellaneous. 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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Quick details
UN 3151
Class: 9
Placard type: Miscellaneous
ERG: Guide 171 (check current ERG)
Isolation: ERG 171: isolate spill area 25-50m all directions; evacuate immediate area if fire involves large quantities
Chemical & Response Details
| Also known as | Halogenated diphenylmethaneChlorinated diphenylmethaneBrominated diphenylmethaneHalogenated benzyl toluene |
| Appearance | Colorless to pale yellow oily liquid with mild aromatic odor. May be transported at elevated temperatures. |
| Flash Point | 110-130C (230-266F) |
| Boiling Point | 280-320C (536-608F) |
| Vapor Density | 6-8 (heavier than air) |
| Water Reactivity | No significant reaction with water |
| Extinguishing | Alcohol-resistant foam, dry chemical, CO2, water spray |
| PPE | ⚠️ Level B minimum for spills; full structural firefighting gear with SCBA for fires |
| Isolation | ERG 171: isolate spill area 25-50m all directions; evacuate immediate area if fire involves large quantities |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Some may burn but none ignite readily.
- Containers may explode when heated.
- Some may be transported hot.
- For UN3508, Capacitor, asymmetric, be aware of possible short circuiting as this product is transported
- Polymeric beads, expandable (UN2211) may evolve flammable vapours.
- Inhalation of material may be harmful.
- Contact may cause burns to skin and eyes.
- Inhalation of Asbestos dust may have a damaging effect on the lungs.
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.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- 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 3151 — Halogenated monomethyldiphenylmethanes, HAZMAT RADIO NOTE — UN 3151
Product: Halogenated monomethyldiphenylmethanes, liquid
Class 9 / Miscellaneous / ERG 171
PPE: Level B minimum for spills; full structural firefighting gear with SCBA for fires
ISOLATION: ERG 171: isolate spill area 25-50m all directions; evacuate immediate area if fire involves large quantities
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 3151 — Halogenated monomethyldiphenylmethanes, liquid
Class: 9 | Placard: Miscellaneous | ERG Guide: 171
Appearance: Colorless to pale yellow oily liquid with mild aromatic odor. May be transported at elevated temperatures.
Water Reactivity: No significant reaction with water
Extinguishing: Alcohol-resistant foam, dry chemical, CO2, water spray
PPE: Level B minimum for spills; full structural firefighting gear with SCBA for fires
Isolation: ERG 171: isolate spill area 25-50m all directions; evacuate immediate area if fire involves large quantities
— Key Hazards —
• Some may burn but none ignite readily.
• Containers may explode when heated.
• Some may be transported hot.
— 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.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/3151 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3151 Halogenated monomethyldiphenylmethanes, liquid Cls9 ERG171 | allfirefighter.com/hazmat/un/3151SMS / 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/3151
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FAQ
Some may burn but none ignite readily. Containers may explode when heated. Some may be transported hot. For UN3508, Capacitor, asymmetric, be aware of possible short circuiting as this product is transported Polymeric beads, expandable (UN2211) may evolve flammable vapours. Inhalation of material may be harmful. Contact may cause burns to skin and eyes. Inhalation of Asbestos dust may have a damaging effect on the lungs.
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 for spills; full structural firefighting gear with SCBA for fires
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 171 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.