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 At a Glance
UN 3083 (Perchloryl fluoride) is listed as DOT Class 2 Toxic Gas and is assigned to ERG Guide 124. Use this page to review placard data, common hazards, PPE notes, isolation context, first actions, and related UN numbers.
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.