UN 3083 — Perchloryl fluoride
Placard: Toxic Gas. ERG Guide 124. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
UN 3083 is Perchloryl fluoride, a toxic oxidizing liquefied gas assigned to ERG Guide 124. Combustion support and corrosive hydrolysis products matter.
Hazard overview: TOXIC oxidizing liquefied gas; inhalation may be fatal. Non-flammable gas, but supports combustion and can ignite or intensify combustibles. Contact with liquefied gas can cause frostbite and chemical injury.
Response guidance: For UN 3083, isolate downwind/low areas, use SCBA with chemical protection and cool cylinders from a protected position. Control reactive/corrosive runoff under ERG 124.
Firefighter training notes: Training for UN 3083 should emphasize exposure routes, SCBA use, vapor/dust monitoring, decontamination, runoff containment and SDS/package verification. Use ERG 124, SDS and local SOP.
Regulatory context: Perchloryl fluoride is regulated as a hazardous material for transport and emergency response. Storage, reporting, exposure, waste and incident-notification duties depend on quantity, formulation and jurisdiction; verify shipping papers, SDS and authority guidance.
Storage & handling: Perchloryl fluoride should be stored in tightly closed compatible containers with ventilation, secondary containment, restricted access and SDS-based segregation from incompatible materials.
UN 3083 Quick Details
Common Hazards of UN 3083
- TOXIC oxidizing liquefied gas; inhalation may be fatal.
- Non-flammable gas, but supports combustion and can ignite or intensify combustibles.
- Contact with liquefied gas can cause frostbite and chemical injury.
- Hydrolysis can form hydrofluoric and perchloric acid-type corrosive products.
- Vapors from liquefied gas are initially heavier than air and may spread along the ground.
- Cylinders exposed to fire may vent, rupture or rocket.
- Runoff or vapor-control water may be corrosive, oxidizing and toxic.
Chemical Identity & Physical Properties
Colorless gas with a characteristic sweet odor. Shipped as a liquefied compressed gas under pressure.
| Also known as | Chlorine oxyfluoridePerchlorofluorideChlorine fluoride oxideTrioxychlorofluoride |
| CAS Number | 7616-94-6 |
| Appearance | Colorless gas with a characteristic sweet odor. Shipped as a liquefied compressed gas under pressure. |
| Flash Point | Not applicable (nonflammable gas) |
| Boiling Point | -46.8C (-52.2F) |
| Vapor Density | 3.6 (heavier than air) |
| Water Reactivity | Hydrolyzes slowly in water forming hydrofluoric and perchloric acids; corrosive products |
Fireground Response Guidance — UN 3083
Extinguishing Media
PPE Requirements
Use positive-pressure SCBA and fully encapsulating chemical protective clothing for significant releases. Protect against toxic corrosive gas and liquefied-gas frostbite.
Isolation & Evacuation
First Actions for a UN 3083 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, gas, mist, smoke or fumes and avoid skin or eye contact.
- Keep water or moisture contact controlled when it may increase fuming, heat or corrosive runoff.
- Do not touch damaged containers or spilled material without proper training and PPE.
- Prevent contaminated liquid, dust, runoff and decontamination waste from spreading.
- Ventilate confined spaces only after monitoring and only if properly trained and equipped.
- Use ERG Guide 124, SDS, shipping papers and monitoring to set isolation, evacuation and entry decisions.
📋 Copy & Share Field Card
UN 3083 — Perchloryl 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.