| CAS/UN/NA-Number | Name | Hazard Class |
|---|
| UN 2545 | Hafnium powder, dry | 4.2 |
| UN 1326 | Hafnium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns | 4.1 |
| Hand signal device, see Signal devices, hand | |
| Hazardous substances, liquid or solid, n.o.s., see Environmentally hazardous substances, etc | |
| NA 3082 | Hazardous waste, liquid, n.o.s. | 9 |
| NA 3077 | Hazardous waste, solid, n.o.s. | 9 |
| UN 1202 | Heating oil, light | 3 |
UN 1046
CAS 7440-59-7 | Helium, compressed | 2.2 |
UN 1963
CAS 7440-59-7 | Helium, refrigerated liquid (cryogenic liquid) | 2.2 |
| UN 3296 | Heptafluoropropane or Refrigerant gas R 227 | 2.2 |
UN 1206
CAS 142-82-5 | Heptanes | 3 |
UN 2661
CAS 116-16-5 | Hexachloroacetone | 6.1 |
UN 2729
CAS 118-74-1 | Hexachlorobenzene | 6.1 |
UN 2279
CAS 87-68-3 | Hexachlorobutadiene | 6.1 |
UN 2646
CAS 77-47-4 | Hexachlorocyclopentadiene | 6.1 |
UN 2875
CAS 70-30-4 | Hexachlorophene | 6.1 |
UN 1781
CAS 5894-60-0 | Hexadecyltrichlorosilane | 8 |
| UN 2458 | Hexadienes | 3 |
| UN 1612 | Hexaethyl tetraphosphate and compressed gas mixtures | 2.3 |
| UN 1611 | Hexaethyl tetraphosphate, liquid | 6.1 |
| UN 1611 | Hexaethyl tetraphosphate, solid | 6.1 |
| UN 2420 | Hexafluoroacetone | 2.3 |
| UN 2552 | Hexafluoroacetone hydrate, liquid | 6.1 |
| UN 3436 | Hexafluoroacetone hydrate, solid | 6.1 |
UN 2193
CAS 76-16-4 | Hexafluoroethane, or Refrigerant gas R 116 | 2.2 |
UN 1782
CAS 16940-81-1 | Hexafluorophosphoric acid | 8 |
| UN 1858 | Hexafluoropropylene compressed or Refrigerant gas R 1216 | 2.2 |
UN 1207
CAS 66-25-1 | Hexaldehyde | 3 |
UN 2281
CAS 822-06-0 | Hexamethylene diisocyanate | 6.1 |
| Hexamethylene triperoxide diamine (dry) | Forbidden |
UN 1783
CAS 124-09-4 | Hexamethylenediamine solution | 8 |
UN 2280
CAS 124-09-4 | Hexamethylenediamine, solid | 8 |
UN 2493
CAS 111-49-9 | Hexamethyleneimine | 3 |
UN 1328
CAS 100-97-0 | Hexamethylenetetramine | 4.1 |
| Hexamethylol benzene hexanitrate | Forbidden |
| UN 1208 | Hexanes | 3 |
| Hexanitroazoxy benzene | Forbidden |
| Hexanitrodiphenyl urea | Forbidden |
UN 0079
CAS 131-73-7 | Hexanitrodiphenylamine or Dipicrylamine or Hexyl | 1.1D |
| Hexanitroethane | Forbidden |
| Hexanitrooxanilide | Forbidden |
| UN 0392 | Hexanitrostilbene | 1.1D |
| Hexanoic acid, see Corrosive liquids, n.o.s. | |
UN 2282
CAS 111-27-3 | Hexanols | 3 |
| Hexogen and cyclotetramethylenetetranitramine mixtures, wetted or desensitized see RDX and HMX mixtures, wetted or desensitized etc | |
| Hexogen and HMX mixtures, wetted or desensitized see RDX and HMX mixtures, wetted or desensitized etc | |
| Hexogen and octogen mixtures, wetted or desensitized see RDX and HMX mixtures, wetted or desensitized etc | |
| Hexogen, see Cyclotrimethylenetrinitramine, etc | |
| UN 0118 | Hexolite, or Hexotol dry or wetted with less than 15 percent water, by mass | 1.1D |
| UN 0393 | Hexotonal | 1.1D |
| Hexyl, see Hexanitrodiphenylamine | |
UN 1784
CAS 928-65-4 | Hexyltrichlorosilane | 8 |
| High explosives, see individual explosives' entries | |
| HMX, see Cyclotetramethylenete tranitramine, etc | |
UN 3484
CAS 302-01-2 | Hydrazine aqueous solution, flammable with more than 37% hydrazine, by mass | 8 |
UN 2030
CAS 302-01-2 | Hydrazine aqueous solution, with more than 37% hydrazine, by mass | 8 |
| Hydrazine azide | Forbidden |
| Hydrazine chlorate | Forbidden |
| Hydrazine dicarbonic acid diazide | Forbidden |
| Hydrazine perchlorate | Forbidden |
| Hydrazine selenate | Forbidden |
UN 2029
CAS 302-01-2 | Hydrazine, anhydrous | 8 |
UN 3293
CAS 302-01-2 | Hydrazine, aqueous solution, with not more than 37 percent hydrazine, by mass | 6.1 |
UN 1787
CAS 10034-85-2 | Hydriodic acid | 8 |
| Hydriodic acid, anhydrous, see Hydrogen iodide, anhydrous | |
| Hydrobromic acid, anhydrous, see Hydrogen bromide, anhydrous | |
UN 1788
CAS 10035-10-6 | Hydrobromic acid, with more than 49 percent hydrobromic acid | 8 |
UN 1788
CAS 10035-10-6 | Hydrobromic acid, with not more than 49 percent hydrobromic acid | 8 |
| UN 1964 | Hydrocarbon gas mixture, compressed, n.o.s. | 2.1 |
| UN 1965 | Hydrocarbon gas mixture, liquefied, n.o.s. | 2.1 |
| UN 3295 | Hydrocarbons, liquid, n.o.s. | 3 |
| UN 1789 | Hydrochloric acid | 8 |
| Hydrochloric acid, anhydrous, see Hydrogen chloride, anhydrous | |
| Hydrocyanic acid (prussic), unstabilized | Forbidden |
| Hydrocyanic acid, anhydrous, see Hydrogen cyanide etc | |
UN 1613
CAS 74-90-8 | Hydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide | 6.1 |
| NA 1613 | Hydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanide | 6.1 |
| Hydrocyanic acid, liquefied, see Hydrogen cyanide, etc | |
UN 1786
CAS 7664-93-9 | Hydrofluoric acid and Sulfuric acid mixtures | 8 |
| Hydrofluoric acid, anhydrous, see Hydrogen fluoride, anhydrous | |
UN 1790
CAS 7664-39-3 | Hydrofluoric acid, with more than 60 percent strength | 8 |
UN 1790
CAS 7664-39-3 | Hydrofluoric acid, with not more than 60 percent strength | 8 |
| Hydrofluoroboric acid, see Fluoroboric acid | |
| Hydrofluorosilicic acid, see Fluorosilicic acid | |
| UN 2034 | Hydrogen and Methane mixtures, compressed | 2.1 |
UN 1048
CAS 10035-10-6 | Hydrogen bromide, anhydrous | 2.3 |
| UN 1050 | Hydrogen chloride, anhydrous | 2.3 |
| UN 2186 | Hydrogen chloride, refrigerated liquid | 2.3 |
UN 3294
CAS 74-90-8 | Hydrogen cyanide, solution in alcohol with not more than 45 percent hydrogen cyanide | 6.1 |
UN 1051
CAS 74-90-8 | Hydrogen cyanide, stabilized with less than 3 percent water | 6.1 |
UN 1614
CAS 74-90-8 | Hydrogen cyanide, stabilized, with less than 3 percent water and absorbed in a porous inert material | 6.1 |
UN 1052
CAS 7664-39-3 | Hydrogen fluoride, anhydrous | 8 |
| 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 |
| Hydrogen iodide solution, see Hydriodic acid | |
UN 2197
CAS 10034-85-2 | Hydrogen iodide, anhydrous | 2.3 |
| UN 3149 | Hydrogen peroxide and peroxyacetic acid mixtures, stabilized with acids, water, and not more than 5 percent peroxyacetic acid | 5.1 |
UN 2014
CAS 7722-84-1 | Hydrogen peroxide, aqueous solutions with not less than 20 percent but not more than 40 percent hydrogen peroxide (stabilized as necessary) | 5.1 |
UN 2015
CAS 7722-84-1 | Hydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized with more than 60 percent hydrogen peroxide | 5.1 |
| UN 3526 | Hydrogen selenide, adsorbed | 2.3 |
UN 2202
CAS 7783-07-5 | Hydrogen selenide, anhydrous | 2.3 |
| Hydrogen sulfate, see Sulfuric acid | |
UN 1053
CAS 7783-06-4 | Hydrogen sulfide | 2.3 |
UN 1049
CAS 1333-74-0 | Hydrogen, compressed | 2.1 |
UN 2014
CAS 7722-84-1 | Hydrogen, peroxide, aqueous solutions with more than 40 percent but not more than 60 percent hydrogen peroxide (stabilized as necessary) | 5.1 |
UN 2984
CAS 7722-84-1 | Hydrogen, peroxide, aqueous solutions with not less than 8 percent but less than 20 percent hydrogen peroxide (stabilized as necessary) | 5.1 |
UN 1966
CAS 1333-74-0 | Hydrogen, refrigerated liquid (cryogenic liquid) | 2.1 |
| UN 3471 | Hydrogendifluoride solution, n.o.s | 8 |
| UN 1740 | Hydrogendifluoride, solid, n.o.s | 8 |
| Hydrosilicofluoric acid, see Fluorosilicic acid | |
| Hydroxyl amine iodide | Forbidden |
| UN 2865 | Hydroxylamine sulfate | 8 |
UN 1791
CAS 7681-52-9 | Hypochlorite solutions | 8 |
| UN 3212 | Hypochlorites, inorganic, n.o.s | 5.1 |
| Hyponitrous acid | Forbidden |