UN 2505 — Ammonium fluoride
Placard: Toxic. ERG Guide 154. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 2505 At a Glance
UN 2505 (Ammonium fluoride) is listed as DOT Class 6 Toxic and is assigned to ERG Guide 154. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
UN 2505 is Ammonium fluoride, a toxic corrosive fluoride salt assigned to ERG Guide 154. Water can create acidic fluoride solution.
Hazard overview: TOXIC and CORROSIVE fluoride salt; inhalation, ingestion or skin contact may cause severe injury. Dissolves in water to form acidic fluoride solution with hydrogen-fluoride-type burn risk. Dust or solution can burn eyes, skin and respiratory tissue.
Response guidance: For UN 2505, isolate the area, avoid skin contact and use SCBA where vapor, dust, mist or fire is present. Contain toxic/corrosive runoff and verify product controls with SDS and ERG 154.
Firefighter training notes: Training for UN 2505 should emphasize toxic/corrosive exposure routes, skin absorption, SCBA use, decontamination, runoff containment and SDS verification. Use ERG 154, SDS and local SOP.
Regulatory context: Ammonium fluoride is regulated as a hazardous material for transport and emergency response. Storage, exposure, spill reporting, waste and fire-code duties depend on quantity, concentration and jurisdiction; verify shipping papers, SDS and local authority requirements.
Storage & handling: Ammonium fluoride should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 2505 Quick Details
Common Hazards of UN 2505
- TOXIC and CORROSIVE fluoride salt; inhalation, ingestion or skin contact may cause severe injury.
- Dissolves in water to form acidic fluoride solution with hydrogen-fluoride-type burn risk.
- Dust or solution can burn eyes, skin and respiratory tissue.
- Non-combustible, but heating can release ammonia and corrosive fluoride fumes.
- Contact with some metals may generate flammable hydrogen gas under acidic conditions.
- Runoff may be fluoride-contaminated and harmful to waterways.
- Calcium-compatible medical/decon planning may be needed for fluoride exposure.
Chemical Identity & Physical Properties
White crystalline solid or colorless to white powder. Odorless or slight ammonia-like odor. Hygroscopic and may form lumps when exposed to moisture.
| Also known as | Neutral ammonium fluorideAmmonium fluoride solutionAmflorFluorid amonny |
| CAS Number | 12125-01-8 |
| Appearance | White crystalline solid or colorless to white powder. Odorless or slight ammonia-like odor. Hygroscopic and may form lumps when exposed to moisture. |
| Flash Point | Not applicable (non-flammable inorganic salt) |
| Boiling Point | Not applicable (decomposes at approximately 238C/460F) |
| Vapor Density | Not applicable (solid material) |
| Water Reactivity | Soluble in water forming acidic solution; no violent reaction but generates heat and potentially corrosive/toxic fumes |
Fireground Response Guidance — UN 2505
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and chemical-resistant protective clothing. Level A may be needed for heavy fuming, splash risk or unknown concentrations.
Isolation & Evacuation
First Actions for a UN 2505 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, dust, mist, smoke or fumes and avoid skin or eye contact.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated dust, liquid, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 154, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 2505 — Ammonium fluorideUse 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.