UN 3507 — Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted
Placard: Toxic. ERG Guide 166. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3507 At a Glance
UN 3507 (Uranium hexafluoride, radioactive material, excepted package, less…) is listed as DOT Class 6 Toxic and is assigned to ERG Guide 166. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
UN 3507 is Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted, a Class 6 hazardous material assigned to ERG Guide 166. Responders should confirm the exact product, container condition and exposure hazards before entry.
Hazard overview: Primary hazards include toxic exposure, corrosive burns, violent water reaction, chemical and radiological contamination. Uranium hexafluoride, radioactive material, excepted package, less than 0.1 kg per package, nonfissile or fissile-excepted may release irritating, toxic or corrosive vapors when heated, spilled or involved in fire, so avoid contact, inhalation and incompatible materials.
Response guidance: For a UN 3507 incident, establish incident command, isolate the area, stay upwind and uphill, keep unauthorized personnel away, verify shipping papers/SDS and follow ERG 166. Use extinguishing, cooling, containment and decontamination tactics only when compatible with the material and local SOP.
UN 3507 Quick Details
Common Hazards of UN 3507
- Radiation presents minimal risk to transport workers, emergency response personnel and the public
- Low radiation hazard to people. Chemical hazard greatly exceeds radiation hazard.
- Substance reacts with water and water vapor in air to form toxic and corrosive hydrogen fluoride gas,
- Toxic; may be fatal if inhaled, ingested, or absorbed through skin.
- Direct contact with substance and gas may cause burns to skin, eyes, or respiratory tract.
- Runoff from control of cargo fire may cause low-level pollution.
- Substance does not burn.
- The material may react violently with fuels.
Chemical Identity & Physical Properties
Colorless to white crystalline solid at room temperature (sublimes at 56°C). Pungent, acrid odor. Highly reactive with moisture.
| Also known as | UF6uranium(VI) fluorideuranium fluoridehex |
| CAS Number | 7783-81-5 |
| Appearance | Colorless to white crystalline solid at room temperature (sublimes at 56°C). Pungent, acrid odor. Highly reactive with moisture. |
| Flash Point | Not applicable (non-flammable solid) |
| Boiling Point | Not applicable (sublimes at 56C/133F) |
| Vapor Density | 12.8 (much heavier than air) |
| Water Reactivity | Reacts violently with water to produce highly toxic and corrosive hydrogen fluoride gas and corrosive uranyl fluoride. Never use water directly on substance. |
Fireground Response Guidance — UN 3507
Extinguishing Media
PPE Requirements
Level A for leak/spill response. Full-face SCBA required. Chemical-resistant suit with respiratory protection mandatory due to HF formation from moisture contact.
Isolation & Evacuation
First Actions for a UN 3507 Incident
- Priorities for rescue, life-saving, first aid, fire control and other hazards are higher than the
- Radiation Authority must be notified of accident conditions. Radiation Authority is usually responsible for
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Detain or isolate uninjured persons or equipment suspected to be contaminated; delay decontamination
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- See Table 1 - Initial Isolation and Protective Action Distances.
📋 Copy & Share Field Card
UN 3507 — Uranium hexafluoride, radioactive materiUse 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.