| CAS/UN/NA-Number | Name | Hazard Class |
|---|
| Igniter fuse, metal clad, see Fuse, igniter, tubular, metal clad | |
| UN 0121 | Igniters | 1.1G |
| UN 2900 | Infectious substances, affecting animals only | 6.2 |
| UN 2814 | Infectious substances, affecting humans | 6.2 |
| Inflammable, see Flammable | |
| Initiating explosives (dry) | Forbidden |
| Inositol hexanitrate (dry) | Forbidden |
| UN 3354 | Insecticide gases, flammable, n.o.s. | 2.1 |
| UN 1968 | Insecticide gases, n.o.s. | 2.2 |
| UN 3355 | Insecticide gases, toxic, flammable, n.o.s. Inhalation hazard Zone A | 2.3 |
| UN 3355 | Insecticide gases, toxic, flammable, n.o.s. Inhalation hazard Zone B | 2.3 |
| UN 3355 | Insecticide gases, toxic, flammable, n.o.s. Inhalation hazard Zone C | 2.3 |
| UN 3355 | Insecticide gases, toxic, flammable, n.o.s. Inhalation hazard Zone D | 2.3 |
| UN 1967 | Insecticide gases, toxic, n.o.s. | 2.3 |
| Inulin trinitrate (dry) | Forbidden |
| UN 3495 | Iodine | 8 |
| Iodine azide (dry) | Forbidden |
| UN 3498 | Iodine monochloride, liquid | 8 |
| UN 1792 | Iodine monochloride, solid | 8 |
| UN 2495 | Iodine pentafluoride | 5.1 |
| UN 2391 | Iodomethylpropanes | 3 |
| UN 2392 | Iodopropanes | 3 |
| Iodoxy compounds (dry) | Forbidden |
| Iridium nitratopentamine iridium nitrate | Forbidden |
| Iron chloride, see Ferric chloride | |
| UN 1376 | Iron oxide, spent, or Iron sponge, spent obtained from coal gas purification | 4.2 |
UN 1994
CAS 13463-40-6 | Iron pentacarbonyl | 6.1 |
| Iron sesquichloride, see Ferric chloride | |
| Irritating material, see Tear gas substances, etc | |
UN 1969
CAS 75-28-5 | Isobutane see also Petroleum gases, liquefied | 2.1 |
UN 1212
CAS 78-83-1 | Isobutanol or Isobutyl alcohol | 3 |
UN 1213
CAS 110-19-0 | Isobutyl acetate | 3 |
UN 2527
CAS 106-63-8 | Isobutyl acrylate, stabilized | 3 |
| Isobutyl alcohol, see Isobutanol | |
| Isobutyl aldehyde, see Isobutyraldehyde | |
| UN 2393 | Isobutyl formate | 3 |
UN 2528
CAS 97-85-8 | Isobutyl isobutyrate | 3 |
| UN 2486 | Isobutyl isocyanate | 6.1 |
UN 2283
CAS 97-86-9 | Isobutyl methacrylate, stabilized | 3 |
| UN 2394 | Isobutyl propionate | 3 |
UN 1214
CAS 78-81-9 | Isobutylamine | 3 |
| UN 1055 | Isobutylene see also Petroleum gases, liquefied | 2.1 |
UN 2045
CAS 78-84-2 | Isobutyraldehyde or Isobutyl aldehyde | 3 |
UN 2529
CAS 79-31-2 | Isobutyric acid | 3 |
UN 2284
CAS 78-82-0 | Isobutyronitrile | 3 |
| UN 2395 | Isobutyryl chloride | 3 |
| UN 2478 | Isocyanates, flammable, toxic, n.o.s. or Isocyanate solutions, flammable, toxic, n.o.s. flash point less than 23 degrees C | 3 |
| UN 3080 | Isocyanates, toxic, flammable, n.o.s. or Isocyanate solutions, toxic, flammable, n.o.s., flash point not less than 23 degrees C but not more than 61 degrees C and boiling point less than 300 degrees C | 6.1 |
| UN 2206 | Isocyanates, toxic, n.o.s. or Isocyanate solutions, toxic, n.o.s., flash point more than 61 degrees C and boiling point less than 300 degrees C | 6.1 |
| UN 2285 | Isocyanatobenzotrifluorides | 6.1 |
| UN 2287 | Isoheptenes | 3 |
| UN 2288 | Isohexenes | 3 |
| Isooctane, see Octanes | |
| UN 1216 | Isooctenes | 3 |
| Isopentane, see Pentane | |
| Isopentanoic acid, see Corrosive liquids, n.o.s. | |
| UN 2371 | Isopentenes | 3 |
UN 2290
CAS 4098-71-9 | Isophorone diisocyanate | 6.1 |
UN 2289
CAS 2855-13-2 | Isophoronediamine | 8 |
UN 1218
CAS 78-79-5 | Isoprene, stabilized | 3 |
UN 1219
CAS 67-63-0 | Isopropanol or Isopropyl alcohol | 3 |
| UN 2403 | Isopropenyl acetate | 3 |
UN 2303
CAS 98-83-9 | Isopropenylbenzene | 3 |
| UN 2934 | Isopropyl 2-chloropropionate | 3 |
UN 1220
CAS 108-21-4 | Isopropyl acetate | 3 |
| UN 1793 | Isopropyl acid phosphate | 8 |
| Isopropyl alcohol, see Isopropanol | |
| UN 2405 | Isopropyl butyrate | 3 |
| UN 2947 | Isopropyl chloroacetate | 3 |
UN 2407
CAS 108-23-6 | Isopropyl chloroformate | 6.1 |
| UN 2406 | Isopropyl isobutyrate | 3 |
| UN 2483 | Isopropyl isocyanate | 6.1 |
| Isopropyl mercaptan, see Propanethiols | |
| UN 1222 | Isopropyl nitrate | 3 |
| Isopropyl phosphoric acid, see Isopropyl acid phosphate | |
| UN 2409 | Isopropyl propionate | 3 |
UN 1221
CAS 75-31-0 | Isopropylamine | 3 |
UN 1918
CAS 98-82-8 | Isopropylbenzene | 3 |
| Isopropylcumyl hydroperoxide, with more than 72 percent in solution | Forbidden |
| UN 2907 | Isosorbide dinitrate mixture with not less than 60 percent lactose, mannose, starch or calcium hydrogen phosphate | 4.1 |
| UN 3251 | Isosorbide-5-mononitrate | 4.1 |
| Isothiocyanic acid | Forbidden |