HazMat Tool — substance information Reference only — not a shipping paper, placard mandate, or CVI record.

Hydrogen, compressed

HMT 15 June 2026

UN / ID: UN 1049
Hazard class: 2.1
Packing group: —
ERG guide: ERG 115
Special provisions: SP N89
Source: 49 CFR §172 (15 June 2026)

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Hydrogen, compressed

Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is colorless, odorless, non-toxic, and highly combustible Wikipedia

Substance Data

Source: PubChem (HSDB, 21.10.2026)

CAS-Number

1333-74-0

Flash Point

—

Boiling Point

-259.16 ° C

Emergency Response Guide No. 115

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard class

2.1
Flammable gases

(4) Identification number

UN 1049

(5) Packing Group

—

(6) Labels

Cargo Aircraft Only (Cargo Aircraft Only)

(7) Special Provisions (§172.102)

×Note:
Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.

N89	When steel UN pressure receptacles are used, only those bearing the “H” mark are authorized. Browse special provision N89

(8) Packing Authorizations (§173.***)

(8A) Exceptions	306	see 49 CFR §173.306
(8B) Non-bulk	302	see 49 CFR §173.302
(8C) Bulk	302, 314	see 49 CFR §173.302, 314

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	150 kg

(10) Vessel stowage

(10A) Location

Stowage category “E” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel carrying a number of passengers limited to not more than the larger of 25 passengers, or one passenger per each 3 m of overall vessel length, but is prohibited from carriage on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

40	see 49 CFR §176.84
57	see 49 CFR §176.84

Source: 49 CFR §176.84

Segregation chart for load, transport, and storage

This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.

Full segregation table for class 2.1 · Browse UN entries for this class

Hazard class	8	7	6.1	5.2	5.1	4.3	4.2	4.1	3	2.3B	2.3A	2.2	2.1	1.6	1.5	1.4	1.3	1.1/1.2
1.1/1.2
1.3
1.4
1.5
1.6
2.1
2.2
2.3A
2.3B
3
4.1
4.2
4.3
5.1
5.2
6.1
7
8

	Must not be loaded, transported, or stored together in the same vehicle or facility.
	May be loaded, transported, or stored together.
	May be loaded, transported, or stored together only with restrictions.

Similar substances

UN / ID	Proper shipping name	Hazard class
	Diacetone alcohol peroxides, with more than 57 percent in solution with more than 9 percent hydrogen peroxide, less than 26 percent diacetone alcohol and less than 9 percent water; total active oxygen content more than 9 percent by mass	Forbidden
UN 3468	Hydrogen in a metal hydride storage system or Hydrogen in a metal hydride storage system contained in equipment or Hydrogen in a metal hydride storage system packed with equipment	2.1
UN 3479	Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment, containing hydrogen in metal hydride	2.1
UN 2014	Hydrogen peroxide, aqueous solutions with not less than 20 percent but not more than 40 percent hydrogen peroxide (stabilized as necessary)	5.1
UN 2014	Hydrogen peroxide, aqueous solutions with more than 40 percent but not more than 60 percent hydrogen peroxide (stabilized as necessary)	5.1
UN 2984	Hydrogen, peroxide, aqueous solutions with not less than 8 percent but less than 20 percent hydrogen peroxide (stabilized as necessary)	5.1
UN 3149	Hydrogen peroxide and peroxyacetic acid mixtures, stabilized with acids, water, and not more than 5 percent peroxyacetic acid	5.1
UN 1613	Hydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide	6.1
UN 1614	Hydrogen cyanide, stabilized, with less than 3 percent water and absorbed in a porous inert material	6.1
UN 2015	Hydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized with more than 60 percent hydrogen peroxide	5.1
UN 2907	Isosorbide dinitrate mixture with not less than 60 percent lactose, mannose, starch or calcium hydrogen phosphate	4.1
	Peroxyacetic acid, with more than 43 percent and with more than 6 percent hydrogen peroxide	Forbidden
UN 3294	Hydrogen cyanide, solution in alcohol with not more than 45 percent hydrogen cyanide	6.1
NA 1613	Hydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanide	6.1
UN 1051	Hydrogen cyanide, stabilized with less than 3 percent water	6.1