UN 3099Oxidizing liquid, toxic, n.o.s.
Division 5.1
Oxidizing substances
Summary
UN 3099 is the UN number for oxidizing liquid, toxic, n.o.s. It is classed in Division 5.1 (oxidizing substances) of Class 5 for transport. Packing group I, II or III, depending on the form. Emergency responders use ERG guide 142.
Emergency response
The Emergency Response Guidebook (ERG2024) guide for this number:
- Guide142Oxidizing liquid, poisonous, n.o.s.Oxidizing liquid, toxic, n.o.s.
From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.
Identification
- UN number
- UN 3099
- Name
- Oxidizing liquid, toxic, n.o.s.
- Hazard class
- Class 5: Oxidizers and organic peroxides
- Division
- 5.1: Oxidizing substances
- Packing group
- I, II, III
- What the class covers
- Substances which may cause or contribute to the combustion of other material, generally by yielding oxygen.
U.S. Hazardous Materials Table
3 entries share this number in 49 CFR 172.101, by name, packing group or where the shipment is going.
UN3099Oxidizing liquid, toxic, n.o.s
- Technical name required in parentheses
Special provisions: 62
- Class
- 5.1
- Packing group
- I
- Labels
- 5.1, 6.1
UN3099Oxidizing liquid, toxic, n.o.s
- Technical name required in parentheses
Special provisions: 62, IB1
- Class
- 5.1
- Packing group
- II
- Labels
- 5.1, 6.1
UN3099Oxidizing liquid, toxic, n.o.s
- Technical name required in parentheses
Special provisions: 62, IB2
- Class
- 5.1
- Packing group
- III
- Labels
- 5.1, 6.1
From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.
About Class 5
Class 5 covers substances that supply oxygen or otherwise intensify a fire. Division 5.1 is oxidizers such as ammonium nitrate and hydrogen peroxide; 5.2 is organic peroxides, which may also be thermally unstable.
Check the official sources
For emergency response, packaging and quantity limits, use these:
- CAMEO Chemicals: UN/NA 3099NOAA datasheets with the ERG response guide and isolation distances
- Emergency Response Guidebook (ERG)PHMSA's guide for first responders, free as a PDF or app
- 49 CFR 172.101 Hazardous Materials TableThe legal U.S. entry: proper shipping name, packing group, labels and special provisions