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Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > Appendix A - Part 2

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blank blank blank blank blank USPS Packaging Instructions
Hazardous Materials Descriptions and
Proper Shipping Names
(a)		 Hazard Class
(b)		 ID Number
(c)		 DOT
PG
(d)		 USPS
Mailability
(e)		 Domestic Mail Air
(f)		 Domestic Mail Surface
(g)
Isocyanates, toxic, n.o.s. or Isocyanate solutions, toxic, n.o.s. flashpoint more than 61° C and boiling point less than 300° C 6.1 UN2206 III Only ORM-D 6A 6A
Isocyanatobenzotrifluorides 6.1 UN2285 II Prohibited blank blank
Isoheptenes 3 UN2287 II Only ORM-D Prohibited 3A
Isohexenes 3 UN2288 II Only ORM-D Prohibited 3A
Isooctane, see Octanes blank blank blank blank blank blank
Isooctenes 3 UN1216 II Only ORM-D Prohibited 3A
Isopentane, see Pentanes blank blank blank blank blank blank
Isopentanoic acid, see Corrosive liquids, n.o.s. blank blank blank blank blank blank
Isopentenes 3 UN2371 I Only ORM-D Prohibited 3A
Isophorone diisocyanate 6.1 UN2290 III Only ORM-D 6A 6A
Isophoronediamine 8 UN2289 III Only ORM-D 8A 8A
Isoprene, inhibited 3 UN1218 I Only ORM-D Prohibited 3A
Isopropanol or Isopropyl alcohol 3 UN1219 II Only ORM-D Prohibited 3A
Isopropenyl acetate 3 UN2403 II Only ORM-D Prohibited 3A
Isopropenylbenzene 3 UN2303 III Only ORM-D Prohibited 3A
Isopropyl acetate 3 UN1220 II Only ORM-D Prohibited 3A
Isopropyl acid phosphate 8 UN1793 III Only ORM-D 8A 8A
Isopropyl alcohol, see Isopropanol blank blank blank blank blank blank
Isopropyl butyrate 3 UN2405 III Only ORM-D Prohibited 3A
Isopropyl chloroacetate 3 UN2947 III Only ORM-D Prohibited 3A
Isopropyl chloroformate 6.1 UN2407 I Prohibited blank blank
Isopropyl 2-chloropropionate 3 UN2934 III Only ORM-D Prohibited 3A
Isopropyl isobutyrate 3 UN2406 II Only ORM-D Prohibited 3A
Isopropyl isocyanate 3 UN2483 I Prohibited Prohibited 3A
Isopropyl mercaptan, see Propanethiols blank blank blank blank blank blank
Isopropyl nitrate 3 UN1222 II Only ORM-D Prohibited 3A
Isopropyl phosphoric acid, see Isopropyl acid phosphate blank blank blank blank blank blank
Isopropyl propionate 3 UN2409 II Only ORM-D Prohibited 3A
Isopropylamine 3 UN1221 I Prohibited blank blank
Isopropylbenzene 3 UN1918 III Only ORM-D Prohibited 3A
Isopropylcumyl hydroperoxide, with more than 72 percent in solution Forbidden blank blank Prohibited blank blank
Isosorbide dinitrate mixture with not less than 60 percent lactose, mannose, starch or calcium hydrogen phosphate 4.1 UN2907 II Prohibited blank blank
Isosorbide-5-mononitrate 4.1 UN3251 III Only ORM-D Prohibited 3A
Isothiocyanic acid Forbidden blank blank Prohibited blank blank
- J - blank blank blank blank blank blank
Jet fuel, see Fuel, aviation, turbine engine blank blank blank blank blank blank
Jet, perforating guns, charged oil well, with detonator 1.1D NA0124 II Prohibited blank blank
Jet, perforating guns, charged oil well, with detonator 1.4D NA0494 II Prohibited blank blank
Jet, perforating guns, charged oil well, without detonator 1.1D UN0124 II Prohibited blank blank
Jet, perforating guns, charged oil well, without detonator 1.4D UN0494 II Prohibited blank blank
Jet, perforators, see Charges, shaped, commercial etc. blank blank blank blank blank blank
Jet tappers, without detonator, see Charges, shaped, commercial, etc. blank blank blank blank blank blank
Jet thrust igniters, for rocket motors or Jato, see Igniters blank blank blank blank blank blank
Jet thrust unit (Jato), see Rockets motors blank blank blank blank blank blank
- K - blank blank blank blank blank blank
Kerosene 3 UN1223 III Only ORM-D Prohibited 3A
Ketones, liquid, n.o.s. 3 UN1224 I Prohibited blank blank
Ketones, liquid, n.o.s. 3 UN1224 II, III Only ORM-D Prohibited 3A
Krypton, compressed 2.2 UN1056 n/a Only ORM-D 2B 2B
Krypton, refrigerated liquid (cryogenic liquid) 2.2 UN1970 n/a Prohibited blank blank
- L - blank blank blank blank blank blank
Lacquer base or lacquer chips, nitrocellulose, dry, see Nitrocellulose, etc. (UN2557) blank blank blank blank blank blank
Lacquer base or lacquer chips, plastic, wet with alcohol or solvent, see Nitrocellulose (UN2059, UN2555, UN2556) or Paint etc. (UN1263) blank blank blank blank blank blank
Lead acetate 6.1 UN1616 III Only ORM-D 6A 6A
Lead arsenates 6.1 UN1617 II Prohibited blank blank
Lead arsenites 6.1 UN1618 II Prohibited blank blank
Lead azide (dry) Forbidden blank blank Prohibited blank blank
Lead azide, wetted with not less than 20 percent water or mixture of alcohol and water, by mass 1.1A UN0129 II Prohibited blank blank
Lead compounds, soluble, n.o.s. 6.1 UN2291 III Only ORM-D 6A 6A
Lead cyanide 6.1 UN1620 II Prohibited blank blank
Lead dioxide 5.1 UN1872 III Only ORM-D 5A 5A
Lead dross, see Lead sulfate with more
than 3 percent free acid		 blank blank blank blank blank blank
Lead mononitroresorcinate 1.1A NA0473 II Prohibited blank blank
Lead nitrate 5.1 UN1469 II Prohibited blank blank
Lead nitroresorcinate (dry) Forbidden blank blank Prohibited blank blank
Lead perchlorate, solid 5.1 UN1470 II Prohibited blank blank
Lead perchlorate, solution 5.1 UN1470 II Prohibited blank blank
Lead peroxide, see Lead dioxide blank blank blank blank blank blank
Lead phosphite, dibasic 4.1 UN2989 II Prohibited blank blank
Lead phosphite, dibasic 4.1 UN2989 III Only ORM-D Prohibited 4A
Lead picrate (dry) Forbidden blank blank Prohibited blank blank
Lead styphnate (dry) Forbidden blank blank Prohibited blank blank
Lead styphnate, wetted or Lead trinitroresorcinate, wetted with not less than 20 percent water or mixture of alcohol and water, by mass 1.1A UN0130 II Prohibited blank blank
Lead sulfate with more than 3 percent free acid 8 UN1794 II Only ORM-D and per 348.2 8A 8A
Lead trinitroresorcinate, see Lead styphnate, etc. blank blank blank blank blank blank
Life-saving appliances, not self-inflating containing dangerous goods as equipment 9 UN3072 n/a Prohibited blank blank
Life-saving appliances, self-inflating 9 UN2990 n/a Prohibited blank blank
Lighter replacement cartridges containing liquefied petroleum gases (and similar devices, each not exceeding 65 grams), see Lighters or Lighter refills etc. containing flammable gas blank blank blank blank blank blank
Lighters or Lighter refills cigarettes, containing flammable gas 2.1 UN1057 n/a Mailable only with PCSC approval per 343.25 and DMM 601.10.13.4 Prohibited 3C
Lighters for cigars, cigarettes, etc., with lighter fluids 3 NA1226 II Mailable only with PCSC approval per 343.25 and DMM 601.10.13.4 Prohibited 3C
Lighters, fuse 1.4S UN0131 II Prohibited blank blank
Lime, unslaked, see Calcium oxide blank blank blank blank blank blank
Liquefied gas, flammable, n.o.s. 2.1 UN3161 n/a Only ORM-D Prohibited 2A
Liquefied gas, n.o.s. 2.2 UN3163 n/a Only ORM-D 2B 2B
Liquefied gas, oxidizing, n.o.s. 2.2 UN3157 n/a Only ORM-D 2B 2B
Liquefied gas, toxic, corrosive, n.o.s. Inhalation Hazard Zone A, B, C, or D 2.3 UN3308 n/a Prohibited blank blank
Liquefied gas, toxic, flammable, corrosive, n.o.s. Inhalation Hazard Zone A, B, C, or D 2.3 UN3309 n/a Prohibited blank blank
Liquefied gas, toxic, flammable, n.o.s. Inhalation Hazard Zone A, B, C, or D 2.3 UN3160 n/a Prohibited blank blank
Liquefied gas, toxic, n.o.s. Inhalation Hazard Zone A, B, C, or D 2.3 UN3162 n/a Prohibited blank blank
Liquefied gas, toxic, oxidizing, corrosive, n.o.s. Inhalation Hazard Zone A, B, C, or D 2.3 UN3310 n/a Prohibited blank blank
Liquefied gas, toxic, oxidizing, n.o.s. Inhalation Hazard Zone A, B, C, or D 2.3 UN3307 n/a Prohibited blank blank
Liquified gases, nonflammable charged with nitrogen, carbon dioxide, or air 2.2 UN1058 n/a Only ORM-D 2B 2B
Liquefied hydrocarbon gas, see Hydrocarbon gas mixtures, liquefied, n.o.s., etc. blank blank blank blank blank blank
Liquefied natural gas, see Methane, etc. (UN1972) blank blank blank blank blank blank
Liquified petroleum gas, see Petroleum gases, liquefied blank blank blank blank blank blank
Lithium 4.3 UN1415 I Prohibited Prohibited 4A
Lithium acetylide ethylenediamine complex, see Water-reactive solid etc. blank blank blank blank blank blank
Lithium alkyls 4.2 UN2445 I Prohibited blank blank
Lithium aluminum hydride 4.3 UN1410 I Prohibited blank blank
Lithium aluminum hydride, ethereal 4.3 UN1411 I Prohibited blank blank
Lithium batteries packed with equipment 9 UN3091 II Only as permitted in 348.22b and 349.22 blank blank
Lithium battery 9 UN3090 II Only as permitted in 348.22b and 349.22 9C 9C
Lithium borohydride 4.3 UN1413 I Prohibited blank blank
Lithium ferrosilicon 4.3 UN2830 II Only ORM-D Prohibited 4A
Lithium hydride 4.3 UN1414 I Prohibited Prohibited 4A
Lithium hydride, fused solid 4.3 UN2805 II Only ORM-D Prohibited 4A
Lithium hydroxide, monohydrate or Lithium hydroxide, solid 8 UN2680 II Only ORM-D 8A 8A
Lithium hydroxide, solution 8 UN2679 II, III Only ORM-D 8A 8A
Lithium hypochlorite, dry or Lithium hypochlorite mixtures, dry 5.1 UN1471 II Only ORM-D 5A 5A
Lithium in cartridges, see Lithium blank blank blank blank blank blank
Lithium nitrate 5.1 UN2722 III Only ORM-D 5A 5A
Lithium nitride 4.3 UN2806 I Prohibited Prohibited 4A
Lithium peroxide 5.1 UN1472 II Only ORM-D 5A 5A
Lithium silicon 4.3 UN1417 II Only ORM-D Prohibited 5A
LNG, see Methane etc. (UN1972) blank blank blank blank blank blank
London purple 6.1 UN1621 II Prohibited 6A 6A
LPG, see Petroleum gases, liquefied blank blank blank blank blank blank
Lye, see Sodium hydroxide solution blank blank blank blank blank blank
- M - blank blank blank blank blank blank
Magnesium or Magnesium alloys with more than 50 percent magnesium in pellets, turnings, or ribbons 4.1 UN1869 III Only ORM-D Prohibited 4A
Magnesium alkyls 4.2 UN3053 I Prohibited blank blank
Magnesium aluminum phosphide 4.3 UN1419 I Prohibited blank blank
Magnesium arsenate 6.1 UN1622 II Prohibited blank blank
Magnesium bisulfite solution, see Bisulfites, aqueous solutions, n.o.s. blank blank blank blank blank blank
Magnesium bromate 5.1 UN1473 II Only ORM-D 5A 5A
Magnesium chlorate 5.1 UN2723 II Only ORM-D 5A 5A
Magnesium diamide 4.2 UN2004 II Prohibited blank blank
Magnesium diphenyl 4.2 UN2005 I Prohibited blank blank
Magnesium dross, wet or hot Forbidden blank blank Prohibited blank blank
Magnesium fluorosilicate 6.1 UN2853 III Only ORM-D 6A 6A
Magnesium granules, coated particle size not less than 149 microns 4.3 UN2950 III Prohibited blank blank
Magnesium hydride 4.3 UN2010 I Prohibited blank blank
Magnesium nitrate 5.1 UN1474 III Only ORM-D 5A 5A
Magnesium perchlorate 5.1 UN1475 II Only ORM-D 5A 5A
Magnesium peroxide 5.1 UN1476 II Only ORM-D 5A 5A
Magnesium phosphide 4.3 UN2011 I Prohibited blank blank
Magnesium, powder or Magnesium alloys, powder 4.3 UN1418 I Prohibited blank blank
Magnesium, powder or Magnesium alloys, powder 4.3 UN1418 II, III Prohibited blank blank
Magnesium scrap, see Magnesium etc. (UN1869) blank blank blank blank blank blank
Magnesium silicide 4.3 UN2624 II Prohibited blank blank
Magnetized material, see 49 CFR 173.21 n/a n/a n/a Mailable only per 349.24 9B 9B
Maleic acid 8 NA2215 III Only ORM-D 8A 8A
Maleic anhydride 8 UN2215 III Only ORM-D 8A 8A
Malononitrile 6.1 UN2647 II Prohibited blank blank
Mancozeb (manganese ethylenebisdithiocarbamate complex with zinc) see Maneb etc. blank blank blank blank blank blank
Maneb or Maneb preparations with not less than 60 percent maneb 4.2 UN2210 III Prohibited blank blank
Maneb stabilized or Maneb preparations, stabilized against self-heating 4.3 UN2968 III Prohibited blank blank
Manganese nitrate 5.1 UN2724 III Only ORM-D 5A 5A
Manganese resinate 4.1 UN1330 III Only ORM-D Prohibited 4A
Mannitan tetranitrate Forbidden blank blank Prohibited blank blank
Mannitol hexanitrate (dry) Forbidden blank blank Prohibited blank blank
Mannitol hexanitrate, wetted or Nitromannite, wetted with not less than 40 percent water, or mixture of alcohol and water, by mass 1.1D UN0133 II Prohibited blank blank
Marine pollutants, liquid or solid, n.o.s., see Environmentally hazardous substances, liquid or solid, n.o.s. blank blank blank blank blank blank
Matches, block, see Matches, strike anywhere blank blank blank blank blank blank
Matches, fusee 4.1 UN2224 III Prohibited blank blank
Matches, safety (book, card, or strike on box) 4.1 UN1944 III Mailable per 344.22 and DMM C023.5.3 Prohibited 4B
Matches, strike anywhere 4.1 UN1331 III Prohibited blank blank
Matches, wax, Vesta 4.1 UN1945 III Prohibited blank blank
Matting acid, see Sulfuric acid etc. blank blank blank blank blank blank
Medicine, liquid, flammable, toxic, n.o.s. 3 UN3248 II Prohibited blank blank
Medicine, liquid, flammable, toxic, n.o.s. 3 UN3248 III Only ORM-D Prohibited 3A
Medicine, liquid, toxic, n.o.s. 6.1 UN1851 II, III Only ORM-D 6A 6A
Medicine, solid, toxic, n.o.s. 6.1 UN3249 II, III Only ORM-D 6A 6A
Medicines, corrosive, liquid, n.o.s. 8 NA1760 II, III Only ORM-D 8A 8A
Medicines, corrosive, solid, n.o.s. 8 NA1759 II, III Only ORM-D 8A 8A
Medicines, flammable, liquid, n.o.s. 3 NA1993 I, II, III Only ORM-D Prohibited 3A
Medicines, flammable, solid, n.o.s. 4.1 NA1325 II Only ORM-D Prohibited 4A
Medicines, oxidizing substance, solid, n.o.s. 5.1 NA1479 II Only ORM-D 5A 5A
Memtetrahydrophthalic anhydride, see Corrosive liquids, n.o.s. blank blank blank blank blank blank
Mercaptans, liquid, flammable, n.o.s. or Mercaptan mixture, liquid, flammable, n.o.s. 3 UN3336 I, II, III Only ORM-D Prohibited 3A
Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s. 3 UN1228 II Prohibited blank blank
Mercaptans, liquid, flammable, toxic, n.o.s. or Mercaptan mixtures, liquid, flammable, toxic, n.o.s. 3 UN1228 III Only ORM-D Prohibited 3A
Mercaptans, liquid, toxic, flammable, n.o.s. or Mercaptan mixtures, liquid, toxic, flammable, n.o.s., flashpoint not less than 23° C 6.1 UN3071 II Prohibited blank blank
5-Mercaptotetrazol-1-acetic acid 1.4C UN0448 II Prohibited blank blank
Mercuric arsenate 6.1 UN1623 II Prohibited blank blank
Mercuric chloride 6.1 UN1624 II Prohibited blank blank
Mercuric compounds, see Mercury compounds, etc. blank blank blank blank blank blank
Mercuric nitrate 6.1 UN1625 II Prohibited blank blank
Mercuric potassium cyanide 6.1 UN1626 I Prohibited blank blank
Mercuric sulfocyanate, see Mercury thiocyanate blank blank blank blank blank blank
Mercurol, see Mercury nucleate blank blank blank blank blank blank
Mercurous azide Forbidden blank blank Prohibited blank blank
Mercurous compounds, see Mercury compounds, etc. blank blank blank blank blank blank
Mercurous nitrate 6.1 UN1627 II Prohibited blank blank
Mercury 8 UN2809 III Prohibited blank blank
Mercury contained in manufactured articles 8 UN2809 III Prohibited blank blank
Mercury acetate 6.1 UN1629 II Prohibited blank blank
Mercury acetylide Forbidden blank blank Prohibited blank blank
Mercury ammonium chloride 6.1 UN1630 II Prohibited blank blank
Mercury based pesticides, liquid, flammable, toxic, flashpoint less than
23° C		 3 UN2778 I, II Prohibited blank blank
Mercury based pesticides, liquid, toxic 6.1 UN3012 I, II Prohibited blank blank
Mercury based pesticides, liquid, toxic 6.1 UN3012 III Only ORM-D 6A 6A
Mercury based pesticides, liquid, toxic, flammable, flashpoint not less than 23° C 6.1 UN3011 I, II Prohibited blank blank
Mercury based pesticides, liquid, toxic, flammable, flashpoint not less than 23° C 6.1 UN3011 III Only ORM-D 6A 6A
Mercury based pesticides, solid, toxic 6.1 UN2777 I, II Prohibited blank blank
Mercury based pesticides, solid, toxic 6.1 UN2777 III Only ORM-D 6A 6A
Mercury benzoate 6.1 UN1631 II Prohibited blank blank
Mercury bromides 6.1 UN1634 II Prohibited blank blank
Mercury compounds, liquid, n.o.s. 6.1 UN2024 I, II Prohibited blank blank
Mercury compounds, liquid, n.o.s. 6.1 UN2024 III Only ORM-D 6A 6A
Mercury compounds, solid, n.o.s. 6.1 UN2025 I, II Prohibited blank blank
Mercury compounds, solid, n.o.s. 6.1 UN2025 III Only ORM-D 6A 6A
Mercury cyanide 6.1 UN1636 II Prohibited blank blank
Mercury fulminate, wetted with not less than 20 percent water, or mixture of alcohol and water, by mass 1.1A UN0135 II Prohibited blank blank
Mercury gluconate 6.1 UN1637 II Prohibited blank blank
Mercury iodide aquabasic ammonobasic (Iodide of Millon's base) Forbidden blank blank Prohibited blank blank
Mercury iodide, solution 6.1 UN1638 II Prohibited blank blank
Mercury iodide, solid 6.1 UN1638 II Prohibited blank blank
Mercury nitride