UN 3152 — Halogenated monomethyldiphenylmethanes, solid
Placard: Miscellaneous. ERG Guide 171. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3152 is Halogenated monomethyldiphenylmethanes, solid, a Class 9 halogenated aromatic solid assigned to ERG Guide 171. Fire decomposition and persistent runoff are key concerns.
Hazard overview: Class 9 halogenated aromatic solid; may burn but does not ignite readily. Dust or heated vapors may irritate eyes, skin and respiratory tract. Fire may produce hydrogen halides, halogenated smoke and other toxic/corrosive decomposition products.
Response guidance: For UN 3152, isolate the area, avoid exposure and use SCBA where vapor, gas, dust, smoke or fire is present. Verify exact contents with SDS, labels and ERG 171.
Firefighter training notes: Training for UN 3152 should emphasize product verification, SCBA use, exposure control, decontamination, runoff containment and SDS/shipping paper review. Use ERG 171, SDS and local SOP.
Regulatory context: Halogenated monomethyldiphenylmethanes, solid is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, package type, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Halogenated monomethyldiphenylmethanes, solid should be stored in tightly closed compatible containers or packages with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 3152 Quick Details
Common Hazards of UN 3152
- Class 9 halogenated aromatic solid; may burn but does not ignite readily.
- Dust or heated vapors may irritate eyes, skin and respiratory tract.
- Fire may produce hydrogen halides, halogenated smoke and other toxic/corrosive decomposition products.
- Molten or hot material can cause thermal burns and spread contamination.
- Runoff may carry persistent halogenated organic contamination.
- Containers may fail or rupture when heated.
- Do not apply unrelated UN3508, asbestos or polymeric-bead assumptions unless present in shipping papers.
Chemical Identity & Physical Properties
Solid material, typically white to off-white or pale yellow crystalline powder or granules. May be odorless or have a faint aromatic odor at room temperature.
| Also known as | Halogenated diphenylmethanesChlorinated diphenylmethanesBrominated diphenylmethanesHalogenated benzhydryl compounds |
| Appearance | Solid material, typically white to off-white or pale yellow crystalline powder or granules. May be odorless or have a faint aromatic odor at room temperature. |
| Flash Point | Greater than 93C (200F) - combustible solid |
| Boiling Point | Not applicable (solid, decomposes before boiling) |
| Vapor Density | Not applicable (solid with negligible vapor pressure at room temperature) |
| Water Reactivity | No significant reaction with water; insoluble in water |
Fireground Response Guidance — UN 3152
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA for dust, smoke or heated material. Wear chemical-resistant gloves, boots, eye/face protection and protective clothing; prevent skin contact.
Isolation & Evacuation
First Actions for a UN 3152 Incident
- Call 911 and the emergency response number on the shipping paper, if available.
- Keep unauthorized personnel away and establish incident command.
- Stay upwind, uphill and upstream.
- Avoid breathing vapor, gas, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers, cylinders, articles or spilled material without proper training and PPE.
- Prevent contaminated runoff, debris and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 171, SDS, shipping papers, markings and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3152 — Halogenated monomethyldiphenylmethanes,Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.