Hydrogen selenide, adsorbed

Hydrogen selenide is an inorganic compound with the formula H2Se. This hydrogen chalcogenide is the simplest and most commonly encountered hydride of selenium. H2Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit of 0.05 ppm over an 8-hour period. Wikipedia

Emergency Response Guide No. 173

Data from the Hazardous Materials Table

Source: 49 CFR §172 (2018/07)

(3) Hazard Class

Poisonous gas

(4) Identification number Help

UN 3526

(5) Packing Group Help


(6) Labels Help

Poisonous gas (2.3) Flammable gases (2.1)

(7) Special Provisions (§172.102) Help

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.

(8) Packing Authorizations (§173.***) Help

(8A) ExceptionsNone
(8B) Non-bulk302csee 49 CFR §173.302c
(8C) BulkNone

(9) Quantity Limits Help

(9A) Passenger aircraft/railForbidden
(9B) Cargo aircraft onlyForbidden

(10) Vessel stowage Help

(10A) Location
(10B) Other

Segregation Chart for Load, Transport, Storage

In this table a statement is contained for each hazard class whether the loading, transport or storage with other hazard classes is allowed, is not permitted or is restricted. The table is based on U.S.-Code 49 CFR §177.848.

red May not be loaded, transported, or stored together in the same transport vehicle or storage facility.
green Load, transport, storage together is not restricted.
yellow Load, transport, storage together is allowed under restrictions.

Substances with similar name

UN-NumberNameHazard Class
Hydrocyanic acid, anhydrous, see Hydrogen cyanide etc
UN 1613Hydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide6.1
NA 1613Hydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanide6.1
UN 1049Hydrogen, compressed2.1
UN 1966Hydrogen, refrigerated liquid (cryogenic liquid)2.1
UN 2034Hydrogen and Methane mixtures, compressed2.1
UN 1048Hydrogen bromide, anhydrous2.3
UN 1050Hydrogen chloride, anhydrous2.3
UN 2186Hydrogen chloride, refrigerated liquid2.3
UN 3294Hydrogen cyanide, solution in alcohol with not more than 45 percent hydrogen cyanide6.1
UN 1614Hydrogen cyanide, stabilized, with less than 3 percent water and absorbed in a porous inert material6.1
UN 1051Hydrogen cyanide, stabilized with less than 3 percent water6.1
UN 1740Hydrogendifluoride, solid, n.o.s8
UN 3471Hydrogendifluoride solution, n.o.s8
UN 2197Hydrogen iodide, anhydrous2.3
UN 2015Hydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized with more than 60 percent hydrogen peroxide5.1
UN 3149Hydrogen peroxide and peroxyacetic acid mixtures, stabilized with acids, water, and not more than 5 percent peroxyacetic acid5.1
Hydrogen sulfate, see Sulfuric acid
UN 1053Hydrogen sulfide2.3
UN 2907Isosorbide dinitrate mixture with not less than 60 percent lactose, mannose, starch or calcium hydrogen phosphate4.1
Peroxyacetic acid, with more than 43 percent and with more than 6 percent hydrogen peroxideForbidden
UN 3421Potassium hydrogendifluoride solution8
UN 2439Sodium hydrogendifluoride8
Sulfuretted hydrogen, see Hydrogen sulfide
UN 1511Urea hydrogen peroxide5.1