| CAS/UN/NA-Number | Name | Hazard Class |
|---|
| m-Nitrobenzene diazonium perchlorate | Forbidden |
| m-Nitrophenyldinitro methane | Forbidden |
| m-Phenylene diaminediperchlorate (dry) | Forbidden |
| UN 1419 | Magnesium aluminum phosphide | 4.3 |
UN 1622
CAS 10103-50-1 | Magnesium arsenate | 6.1 |
| Magnesium bisulfite solution, see Bisulfites, aqueous solutions, n.o.s. | |
| UN 1473 | Magnesium bromate | 5.1 |
| UN 2723 | Magnesium chlorate | 5.1 |
| UN 2004 | Magnesium diamide | 4.2 |
| Magnesium dross, wet or hot | Forbidden |
| UN 2853 | Magnesium fluorosilicate | 6.1 |
| UN 2950 | Magnesium granules, coated, particle size not less than 149 microns | 4.3 |
| UN 2010 | Magnesium hydride | 4.3 |
| UN 1474 | Magnesium nitrate | 5.1 |
UN 1869
CAS 7439-95-4 | Magnesium or Magnesium alloys with more than 50 percent magnesium in pellets, turnings or ribbons | 4.1 |
UN 1475
CAS 10034-81-8 | Magnesium perchlorate | 5.1 |
UN 1476
CAS 14452-57-4 | Magnesium peroxide | 5.1 |
| UN 2011 | Magnesium phosphide | 4.3 |
| Magnesium scrap, see Magnesium, etc. (UN 1869) | |
| UN 2624 | Magnesium silicide | 4.3 |
UN 1418
CAS 7439-95-4 | Magnesium, powder or Magnesium alloys, powder | 4.3 |
| Magnetized material, see § 173.21 | |
UN 2215
CAS 108-31-6 | Maleic anhydride | 8 |
UN 2215
CAS 108-31-6 | Maleic anhydride, molten | 8 |
UN 2647
CAS 109-77-3 | Malononitrile | 6.1 |
| Mancozeb (manganese ethylenebisdithiocarbamate complex with zinc) see Maneb | |
UN 2210
CAS 12427-38-2 | Maneb or Maneb preparations with not less than 60 percent maneb | 4.2 |
UN 2968
CAS 12427-38-2 | Maneb stabilized or Maneb preparations, stabilized against self-heating | 4.3 |
| UN 2724 | Manganese nitrate | 5.1 |
| UN 1330 | Manganese resinate | 4.1 |
| Mannitan tetranitrate | Forbidden |
| Mannitol hexanitrate (dry) | Forbidden |
UN 0133
CAS 15825-70-4 | Mannitol hexanitrate, wetted or Nitromannite, wetted with not less than 40 percent water, or mixture of alcohol and water, by mass | 1.1D |
| Marine pollutants, liquid or solid, n.o.s., see Environmentally hazardous substances, liquid or solid, n.o.s. | |
| Matches, block, see Matches, 'strike anywhere' | |
| UN 2254 | Matches, fusee | 4.1 |
| UN 1944 | Matches, safety (book, card or strike on box) | 4.1 |
| UN 1331 | Matches, strike anywhere | 4.1 |
| UN 1945 | Matches, wax, Vesta | 4.1 |
| Matting acid, see Sulfuric acid | |
| UN 3248 | Medicine, liquid, flammable, toxic, n.o.s | 3 |
| UN 1851 | Medicine, liquid, toxic, n.o.s | 6.1 |
| UN 3249 | Medicine, solid, toxic, n.o.s | 6.1 |
| Memtetrahydrophthalic anhydride, see Corrosive liquids, n.o.s. | |
| UN 3336 | Mercaptans, liquid, flammable, n.o.s. or Mercaptan mixture, liquid, flammable, n.o.s | 3 |
| UN 1228 | Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s | 3 |
| UN 3071 | Mercaptans, liquid, toxic, flammable, n.o.s. or Mercaptan mixtures, liquid, toxic, flammable, n.o.s., flash point not less than 23 degrees C | 6.1 |
| UN 1623 | Mercuric arsenate | 6.1 |
UN 1624
CAS 7487-94-7 | Mercuric chloride | 6.1 |
| Mercuric compounds, see Mercury compounds, etc | |
UN 1625
CAS 10045-94-0 | Mercuric nitrate | 6.1 |
UN 1626
CAS 591-89-9 | Mercuric potassium cyanide | 6.1 |
| Mercuric sulfocyanate, see Mercury thiocyanate | |
| Mercurol, see Mercury nucleate | |
| Mercurous azide | Forbidden |
| Mercurous compounds, see Mercury compounds, etc | |
UN 1627
CAS 10415-75-5 | Mercurous nitrate | 6.1 |
| UN 2809 | Mercury | 8 |
UN 1629
CAS 1600-27-7 | Mercury acetate | 6.1 |
| Mercury acetylide | Forbidden |
| UN 1630 | Mercury ammonium chloride | 6.1 |
| UN 2778 | Mercury based pesticides, liquid, flammable, toxic, flash point less than 23 degrees C | 3 |
| UN 3012 | Mercury based pesticides, liquid, toxic | 6.1 |
| UN 3011 | Mercury based pesticides, liquid, toxic, flammable, flash point not less than 23 degrees C | 6.1 |
| UN 2777 | Mercury based pesticides, solid, toxic | 6.1 |
UN 1631
CAS 583-15-3 | Mercury benzoate | 6.1 |
UN 1634
CAS 10031-18-2 | Mercury bromides | 6.1 |
UN 2024
CAS 502-39-6 | Mercury compound, liquid, n.o.s | 6.1 |
UN 2025
CAS 502-39-6 | Mercury compound, solid, n.o.s | 6.1 |
| UN 3506 | Mercury contained in manufactured articles | 8 |
UN 1636
CAS 592-04-1 | Mercury cyanide | 6.1 |
UN 0135
CAS 628-86-4 | Mercury fulminate, wetted with not less than 20 percent water, or mixture of alcohol and water, by mass | 1.1A |
| UN 1637 | Mercury gluconate | 6.1 |
UN 1638
CAS 7774-29-0 | Mercury iodide | 6.1 |
| Mercury iodide aquabasic ammonobasic (Iodide of Millon's base) | Forbidden |
| Mercury nitride | Forbidden |
| UN 1639 | Mercury nucleate | 6.1 |
UN 1640
CAS 1191-80-6 | Mercury oleate | 6.1 |
UN 1641
CAS 21908-53-2 | Mercury oxide | 6.1 |
| Mercury oxycyanide | Forbidden |
| UN 1642 | Mercury oxycyanide, desensitized | 6.1 |
UN 1643
CAS 7783-33-7 | Mercury potassium iodide | 6.1 |
| UN 1644 | Mercury salicylate | 6.1 |
UN 1645
CAS 7783-35-9 | Mercury sulfates | 6.1 |
UN 1646
CAS 592-85-8 | Mercury thiocyanate | 6.1 |
UN 1229
CAS 141-79-7 | Mesityl oxide | 3 |
| UN 3281 | Metal carbonyls, liquid, n.o.s. | 6.1 |
| UN 3466 | Metal carbonyls, solid, n.o.s. | 6.1 |
| UN 2881 | Metal catalyst, dry | 4.2 |
| UN 1378 | Metal catalyst, wetted with a visible excess of liquid | 4.2 |
| UN 3182 | Metal hydrides, flammable, n.o.s | 4.1 |
| UN 1409 | Metal hydrides, water reactive, n.o.s | 4.3 |
| UN 3189 | Metal powder, self-heating, n.o.s | 4.2 |
| UN 3089 | Metal powders, flammable, n.o.s | 4.1 |
| Metal salts of methyl nitramine (dry) | Forbidden |
| UN 3181 | Metal salts of organic compounds, flammable, n.o.s | 4.1 |
| UN 1332 | Metaldehyde | 4.1 |
| UN 3208 | Metallic substance, water-reactive, n.o.s | 4.3 |
| UN 3209 | Metallic substance, water-reactive, self-heating, n.o.s | 4.3 |
| UN 2396 | Methacrylaldehyde, stabilized | 3 |
UN 2531
CAS 79-41-4 | Methacrylic acid, stabilized | 8 |
UN 3079
CAS 126-98-7 | Methacrylonitrile, stabilized | 6.1 |
| UN 2614 | Methallyl alcohol | 3 |
| Methane and hydrogen, mixtures, see Hydrogen and methane, mixtures, etc | |
UN 1971
CAS 74-82-8 | Methane, compressed or Natural gas, compressed (with high methane content) | 2.1 |
UN 1972
CAS 74-82-8 | Methane, refrigerated liquid (cryogenic liquid) or Natural gas, refrigerated liquid (cryogenic liquid), with high methane content) | 2.1 |
UN 3246
CAS 124-63-0 | Methanesulfonyl chloride | 6.1 |
UN 1230
CAS 67-56-1 | Methanol | 3 |
| Methazoic acid | Forbidden |
| UN 2605 | Methoxymethyl isocyanate | 6.1 |
| UN 2933 | Methyl 2-chloropropionate | 3 |
UN 1231
CAS 79-20-9 | Methyl acetate | 3 |
| UN 1060 | Methyl acetylene and propadiene mixtures, stabilized | 2.1 |
UN 1919
CAS 96-33-3 | Methyl acrylate, stabilized | 3 |
| Methyl alcohol, see Methanol | |
UN 2554
CAS 563-47-3 | Methyl allyl chloride | 3 |
| Methyl amyl ketone, see Amyl methyl ketone | |
UN 1062
CAS 74-83-9 | Methyl bromide | 2.3 |
| Methyl bromide and chloropicrin mixtures with more than 2 percent chloropicrin, see Chloropicrin and methyl bromide mixtures | |
| Methyl bromide and chloropicrin mixtures with not more than 2 percent chloropicrin, see Methyl bromide | |
| UN 1647 | Methyl bromide and ethylene dibromide mixtures, liquid | 6.1 |
| UN 2643 | Methyl bromoacetate | 6.1 |
UN 1237
CAS 623-42-7 | Methyl butyrate | 3 |
| Methyl chloride and chloropicrin mixtures, see Chloropicrin and methyl chloride mixtures | |
| UN 1912 | Methyl chloride and methylene chloride mixtures | 2.1 |
UN 1063
CAS 74-87-3 | Methyl chloride or Refrigerant gas R 40 | 2.1 |
UN 2295
CAS 96-34-4 | Methyl chloroacetate | 6.1 |
| Methyl chlorocarbonate, see Methyl chloroformate | |
| Methyl chloroform, see 1,1,1-Trichloroethane | |
UN 1238
CAS 79-22-1 | Methyl chloroformate | 6.1 |
| UN 1239 | Methyl chloromethyl ether | 6.1 |
| UN 2299 | Methyl dichloroacetate | 6.1 |
| Methyl ethyl ether, see Ethyl methyl ether | |
| Methyl ethyl ketone peroxide, in solution with more than 9 percent by mass active oxygen | Forbidden |
| Methyl ethyl ketone, see Ethyl methyl ketone | |
| UN 2454 | Methyl fluoride, or Refrigerant gas R 41 | 2.1 |
UN 1243
CAS 107-31-3 | Methyl formate | 3 |
UN 2644
CAS 74-88-4 | Methyl iodide | 6.1 |
UN 2053
CAS 105-30-6 | Methyl isobutyl carbinol | 3 |
UN 1245
CAS 108-10-1 | Methyl isobutyl ketone | 3 |
| Methyl isobutyl ketone peroxide, in solution with more than 9 percent by mass active oxygen | Forbidden |
UN 2480
CAS 624-83-9 | Methyl isocyanate | 6.1 |
UN 1246
CAS 814-78-8 | Methyl isopropenyl ketone, stabilized | 3 |
UN 2477
CAS 556-61-6 | Methyl isothiocyanate | 6.1 |
| UN 2400 | Methyl isovalerate | 3 |
| UN 1928 | Methyl magnesium bromide, in ethyl ether | 4.3 |
UN 1064
CAS 74-93-1 | Methyl mercaptan | 2.3 |
| Methyl mercaptopropionaldehyde, see 4-Thiapentanal | |
UN 1247
CAS 80-62-6 | Methyl methacrylate monomer, stabilized | 3 |
| Methyl nitramine (dry) | Forbidden |
| Methyl nitrate | Forbidden |
| Methyl nitrite | Forbidden |
| Methyl norbornene dicarboxylic anhydride, see Corrosive liquids, n.o.s. | |
UN 2606
CAS 681-84-5 | Methyl orthosilicate | 6.1 |
| NA 9206 | Methyl phosphonic dichloride | 6.1 |
| Methyl phosphonothioic dichloride, anhydrous, see Corrosive liquid, n.o.s. | |
| NA 2845 | Methyl phosphonous dichloride, pyrophoric liquid | 6.1 |
| Methyl picric acid (heavy metal salts of) | Forbidden |
UN 1248
CAS 554-12-1 | Methyl propionate | 3 |
| UN 2612 | Methyl propyl ether | 3 |
UN 1249
CAS 107-87-9 | Methyl propyl ketone | 3 |
| Methyl sulfate, see Dimethyl sulfate | |
| Methyl sulfide, see Dimethyl sulfide | |
UN 2398
CAS 1634-04-4 | Methyl tert-butyl ether | 3 |
| UN 2533 | Methyl trichloroacetate | 6.1 |
| Methyl trimethylol methane trinitrate | Forbidden |
UN 1251
CAS 78-94-4 | Methyl vinyl ketone, stabilized | 6.1 |
UN 1234
CAS 109-87-5 | Methylal | 3 |
| Methylamine dinitramine and dry salts thereof | Forbidden |
| Methylamine nitroform | Forbidden |
| Methylamine perchlorate (dry) | Forbidden |
UN 1061
CAS 74-89-5 | Methylamine, anhydrous | 2.1 |
UN 1235
CAS 74-89-5 | Methylamine, aqueous solution | 3 |
UN 1233
CAS 108-84-9 | Methylamyl acetate | 3 |
| UN 2534 | Methylchlorosilane | 2.3 |
UN 2296
CAS 108-87-2 | Methylcyclohexane | 3 |
UN 2617
CAS 25639-42-3 | Methylcyclohexanols, flammable | 3 |
UN 2297
CAS 583-60-8 | Methylcyclohexanone | 3 |
UN 2298
CAS 96-37-7 | Methylcyclopentane | 3 |
| NA 1556 | Methyldichloroarsine | 6.1 |
UN 1242
CAS 75-54-7 | Methyldichlorosilane | 4.3 |
| Methylene chloride, see Dichloromethane | |
| Methylene glycol dinitrate | Forbidden |
UN 1244
CAS 60-34-4 | Methylhydrazine | 6.1 |
| UN 2461 | Methylpentadienes | 3 |
| Methylpentanes, see Hexanes | |
UN 2437
CAS 149-74-6 | Methylphenyldichlorosilane | 8 |
| UN 2536 | Methyltetrahydrofuran | 3 |
UN 1250
CAS 75-79-6 | Methyltrichlorosilane | 3 |
| Mine rescue equipment containing carbon dioxide, see Carbon dioxide | |
| UN 0136 | Mines with bursting charge | 1.1F |
| Mixed acid, see Nitrating acid, mixtures etc | |
| Mobility aids, see Battery powered equipment or Battery powered vehicle' | |
| NA 0276 | Model rocket motor | 1.4C |
| UN 2508 | Molybdenum pentachloride | 8 |
| Monochloroacetone (unstabilized) | Forbidden |
| Monochloroethylene, see Vinyl chloride, stabilized | |
| Monoethanolamine, see Ethanolamine, solutions | |
| Monoethylamine, see Ethylamine | |
UN 2054
CAS 110-91-8 | Morpholine | 8 |
| Morpholine, aqueous, mixture, see Corrosive liquids, n.o.s. | |
| Motor fuel anti-knock compounds see Motor fuel anti-knock mixtures | |
| UN 3483 | Motor fuel anti-knock mixture, flammable | 6.1 |
UN 1649
CAS 75-74-1 | Motor fuel anti-knock mixtures | 6.1 |
| Motor spirit, see Gasoline | |
| Muriatic acid, see Hydrochloric acid | |
| Musk xylene, see 5-tert-Butyl-2,4,6-trinitro-m-xylene | |