UN2421

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Nitrogen trioxide

Official source: 49 CFR 172.101 (eCFR)

Hazardous Materials Table entry

One row in 49 CFR 172.101 for UN2421.

Sym.	Description	Class	PG	Labels	Special provisions	8A	8B	8C	9A	9B	10A	10B
—	Nitrogen trioxide	2.3	—	2.3, 5.1, 8	1	None	336	245	Forbidden	Forbidden	D	40, 89, 90

Sym.: Column 1 symbols, 49 CFR 172.101(b).
Description: Column 2, the proper shipping name, 172.101(c).
Class: Column 3, hazard class or division, 172.101(d).
PG: Column 5, packing group, 172.101(f).
Labels: Column 6, label codes, 172.101(g).
Special provisions: Column 7, codes explained in 49 CFR 172.102, 172.101(h).
8A / 8B / 8C: Packaging exceptions, non-bulk and bulk sections of 49 CFR part 173 (an entry of 202 means 173.202), 172.101(i).
9A / 9B: Maximum quantity per package on passenger aircraft or rail, and on cargo aircraft only, 172.101(j).
10A / 10B: Vessel stowage location and other stowage and handling codes, 172.101(k).

Division 2.3 — Gas Poisonous by Inhalation

See the full class list

A gas poisonous by inhalation (Division 2.3) is a gas at 20°C (68°F) or less and 101.3 kPa (14.7 psia) that is known to be so toxic to humans as to pose a hazard to health during transportation, or is presumed toxic based on laboratory animal LC50 data.

Source: 49 CFR 173.115 (eCFR).

Previous / next UN number

UN2420Hexafluoroacetone UN2422Octafluorobut-2-ene or Refrigerant gas R 1318

Nearby Class 2.3 UN Numbers

UN2204Carbonyl sulfide UN2417Carbonyl fluoride UN2418Sulfur tetrafluoride UN2534Methylchlorosilane UN2548Chlorine pentafluoride UN2676Stibine UN2901Bromine chloride

View the full Class 2.3 list →

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