Records 2,801–3,200 — Mailing and air-carriage restrictions by item category

Records 2,801 to 3,200 of 3,204. Each links to its own page, which carries the source URL and the quoted line that states the value.

• Self-reactive liquid type E, temperature controlledSelf-reactive liquid type E, temperature controlled 4.1 UN3237 II Prohibited Prohibited
• Self-reactive liquid type FSelf-reactive liquid type F 4.1 UN3229 II Prohibited Prohibited
• Self-reactive liquid type F, temperature controlledSelf-reactive liquid type F, temperature controlled 4.1 UN3239 II Prohibited Prohibited
• Self-reactive solid type BSelf-reactive solid type B 4.1 UN3222 II Prohibited Prohibited
• Self-reactive solid type B, temperature controlledSelf-reactive solid type B, temperature controlled 4.1 UN3232 II Prohibited Prohibited
• Self-reactive solid type CSelf-reactive solid type C 4.1 UN3224 II Prohibited Prohibited
• Self-reactive solid type C, temperature controlledSelf-reactive solid type C, temperature controlled 4.1 UN3234 II Prohibited Prohibited
• Self-reactive solid type DSelf-reactive solid type D 4.1 UN3226 II Prohibited Prohibited
• Self-reactive solid type D, temperature controlledSelf-reactive solid type D, temperature controlled 4.1 UN3236 II Prohibited Prohibited
• Self-reactive solid type ESelf-reactive solid type E 4.1 UN3228 II Prohibited Prohibited
• Self-reactive solid type E, temperature controlledSelf-reactive solid type E, temperature controlled 4.1 UN3238 II Prohibited Prohibited
• Self-reactive solid type FSelf-reactive solid type F 4.1 UN3230 II Prohibited Prohibited
• Self-reactive solid type F, temperature controlledSelf-reactive solid type F, temperature controlled 4.1 UN3240 II Prohibited Prohibited
• Sharps and regulated medical waste containing Category B infectious substance (UN3291)Regulated medical waste and sharps medical waste as defined in 346.12 ( f ) and 346.12 ( g ) and containing materials classified as Category B infectious substances must be marked
• short-barreled rifles or shotguns - concealableShort-barreled rifles or shotguns that can be concealed on the person are nonmailable.
• Shotgun hulls, empty casings, nonmetallic shotgun hulls, or casings without primersShotgun Hulls, Empty Casings, Nonmetallic Shotgun Hulls, or Casings Without Primers: These articles are not classified as explosives or hazardous materials under 49 CFR and, theref
• Signal devices, handSignal devices, hand 1.4S UN0373 II Prohibited Prohibited
• Signals, distress, shipSignals, distress, ship 1.1G UN0194 II Prohibited Prohibited
• Signals, railway track, explosiveSignals, railway track, explosive 1.1G UN0192 II Prohibited Prohibited
• Signals, smokeSignals, smoke 1.2G UN0313 II Prohibited Prohibited
• SilaneSilane 2.1 UN2203 n/a Prohibited Prohibited
• Silicon powder, amorphousSilicon powder, amorphous 4.1 UN1346 III Prohibited Prohibited
• Silicon tetrachlorideSilicon tetrachloride 8 UN1818 II 8A 8A
• Silicon tetrafluoride, compressedSilicon tetrafluoride, compressed 2.3 UN1859 n/a Prohibited Prohibited
• Silver acetylide (dry)Silver acetylide (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Silver arseniteSilver arsenite 6.1 UN1683 II Prohibited Prohibited
• Silver azide (dry)Silver azide (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Silver chlorite (dry)Silver chlorite (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Silver cyanideSilver cyanide 6.1 UN1684 II Prohibited Prohibited
• Silver fulminate (dry) · USPSSilver fulminate (dry) Forbidden Prohibited Prohibited
• Silver nitrateSilver nitrate 5.1 UN1493 II 5A 5A
• Silver oxalate (dry)Silver oxalate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Silver picrate (dry)Silver picrate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Silver picrate, wetted with not less than 30 percent water, by massSilver picrate, wetted with not less than 30 percent water, by mass 4.1 UN1347 I Prohibited Prohibited
• Sludge, acidSludge, acid 8 UN1906 II Prohibited Prohibited
• Small Arms Ammunition regulated as Class 1 explosiveAmmunition that is regulated as a Class 1 explosive and designed to be fired from a pistol, revolver, rifle, or shotgun, as well as associated primers and blank cartridges (includi
• Small consumer-type lithium-ion batteries in equipment (up to 20 Wh per cell, 100 Wh per battery)Small consumer-type lithium-ion cells and batteries (also called secondary lithium cells or batteries), such as those used to power cell phones and laptop computers, are only maila
• Small consumer-type lithium metal batteries in equipment (up to 1g per cell, 2g per battery)Small consumer-type lithium metal cells or batteries (also called primary lithium cells or batteries), such as those used to power cameras or flashlights, are mailable domestically
• small harmless cold-blooded animals (except snakes, turtles, turtle eggs)Small, harmless, cold-blooded animals, except for snakes, turtles, and turtle eggs, are mailable only when they meet requirements specified in Exhibit 526.6
• Smokeless powder for small arms (100 pounds or less)Smokeless powder for small arms (100 pounds or less) 4.1 NA3178 I Prohibited Prohibited
• smokeless tobaccoSmokeless Tobacco: Any finely cut, ground, powdered, or leaf tobacco intended to be placed in the oral or nasal cavity or otherwise consumed without combustion.
• snakes, turtles, and poisonous reptilesAll snakes, turtles, and poisonous reptiles are nonmailable.
• Soda lime with more than 4 percent sodium hydroxideSoda lime with more than 4 percent sodium hydroxide 8 UN1907 III 8A 8A
• SodiumSodium 4.3 UN1428 I Prohibited Prohibited
• Sodium aluminate, solidSodium aluminate, solid 8 UN2812 III 8A 8A
• Sodium aluminate, solutionSodium aluminate, solution 8 UN1819 II, III 8A 8A
• Sodium aluminum hydrideSodium aluminum hydride 4.3 UN2835 II Prohibited 4A
• Sodium ammonium vanadateSodium ammonium vanadate 6.1 UN2863 II Prohibited Prohibited
• Sodium arsanilateSodium arsanilate 6.1 UN2473 III 6A 6A
• Sodium arsenateSodium arsenate 6.1 UN1685 II Prohibited Prohibited
• Sodium arsenite, solidSodium arsenite, solid 6.1 UN2027 II Prohibited Prohibited
• Sodium azideSodium azide 6.1 UN1687 II Prohibited Prohibited
• Sodium borohydrideSodium borohydride 4.3 UN1426 I Prohibited Prohibited
• Sodium borohydride and sodium hydroxide solution, with not more than 12 percent sodium borohydride and not more than 40 percent sodium hydroxide by massSodium borohydride and sodium hydroxide solution, with not more than 12 percent sodium borohydride and not more than 40 percent sodium hydroxide by mass 8 UN3320 II, III Prohibited
• Sodium bromateSodium bromate 5.1 UN1494 II 5A 5A
• Sodium cacodylateSodium cacodylate 6.1 UN1688 II Prohibited Prohibited
• Sodium carbonate peroxyhydrateSodium carbonate peroxyhydrate 5.1 UN3378 II, III 5A 5A
• Sodium chlorateSodium chlorate 5.1 UN1495 II 5A 5A
• Sodium chlorate, aqueous solutionSodium chlorate, aqueous solution 5.1 UN2428 II, III 5A 5A
• Sodium chloriteSodium chlorite.
• Sodium chloroacetateSodium chloroacetate 6.1 UN2659 III 6A 6A
• Sodium cuprocyanide, solidSodium cuprocyanide, solid 6.1 UN2316 I Prohibited Prohibited
• Sodium cuprocyanide, solutionSodium cuprocyanide, solution 6.1 UN2317 I Prohibited Prohibited
• Sodium cyanide, solidSodium cyanide, solid 6.1 UN1689 I Prohibited Prohibited
• Sodium dinitro-o-cresolate, dry or wetted with less than 15 percent water, by mass · USPSSodium dinitro-o-cresolate, dry or wetted with less than 15 percent water, by mass 1.3C UN0234 II Prohibited Prohibited
• Sodium dinitro-o-cresolate, wetted with not less than 10 percent water, by massSodium dinitro-o-cresolate, wetted with not less than 10 percent water, by mass 4.1 UN3369 I Prohibited Prohibited
• Sodium dinitro-o-cresolate, wetted with not less than 15 percent water, by massSodium dinitro-o-cresolate, wetted with not less than 15 percent water, by mass 4.1 UN1348 I Prohibited Prohibited
• Sodium dithionite or Sodium hydrosulfiteSodium dithionite or Sodium hydrosulfite 4.2 UN1384 II Prohibited Prohibited
• Sodium fluoride, solidSodium fluoride, solid 6.1 UN1690 III 6A 6A
• Sodium fluoride, solutionSodium fluoride, solution 6.1 UN3415 III 6A 6A
• Sodium fluoroacetateSodium fluoroacetate 6.1 UN2629 I Prohibited Prohibited
• Sodium fluorosilicateSodium fluorosilicate 6.1 UN2674 III 6A 6A
• Sodium hydrideSodium hydride 4.3 UN1427 I Prohibited Prohibited
• Sodium hydrogendifluorideSodium hydrogendifluoride 8 UN2439 II 8A 8A
• Sodium hydrosulfide, with less than 25 percent water of crystallizationSodium hydrosulfide, with less than 25 percent water of crystallization 4.2 UN2318 II Prohibited Prohibited
• Sodium hydrosulfide, with not less than 25 percent water of crystallizationSodium hydrosulfide, with not less than 25 percent water of crystallization 8 UN2949 II Prohibited Prohibited
• Sodium hydroxide, solidSodium hydroxide, solid 8 UN1823 II 8A 8A
• Sodium hydroxide solutionSodium hydroxide solution 8 UN1824 II, III 8A 8A
• Sodium methylateSodium methylate 4.2 UN1431 II Prohibited Prohibited
• Sodium monoxideSodium monoxide 8 UN1825 II 8A 8A
• Sodium nitrateSodium nitrate 5.1 UN1498 III 5A 5A
• Sodium nitrate and potassium nitrate mixturesSodium nitrate and potassium nitrate mixtures 5.1 UN1499 III 5A 5A
• Sodium nitriteSodium nitrite 5.1 UN1500 III 5A 5A
• Sodium pentachlorophenateSodium pentachlorophenate 6.1 UN2567 II Prohibited Prohibited
• Sodium perborate monohydrateSodium perborate monohydrate 5.1 UN3377 III 5A 5A
• Sodium perchlorateSodium perchlorate 5.1 UN1502 II 5A 5A
• Sodium permanganateSodium permanganate 5.1 UN1503 II 5A 5A
• Sodium peroxideSodium peroxide 5.1 UN1504 I Prohibited Prohibited
• Sodium peroxoborate, anhydrousSodium peroxoborate, anhydrous 5.1 UN3247 II 5A 5A
• Sodium persulfateSodium persulfate 5.1 UN1505 III 5A 5A
• Sodium phosphideSodium phosphide 4.3 UN1432 I Prohibited 4A
• Sodium picramate, dry or wetted with less than 20 percent water, by massSodium picramate, dry or wetted with less than 20 percent water, by mass 1.3C UN0235 II Prohibited Prohibited
• Sodium picramate, wetted with not less than 20 percent water, by massSodium picramate, wetted with not less than 20 percent water, by mass 4.1 UN1349 I Prohibited Prohibited
• Sodium picryl peroxideSodium picryl peroxide Forbidden Prohibited Prohibited Prohibited Prohibited
• Sodium sulfide, anhydrous or Sodium sulfide with less than 30 percent water of crystallizationSodium sulfide, anhydrous or Sodium sulfide with less than 30 percent water of crystallization 4.2 UN1385 II Prohibited Prohibited
• Sodium sulfide, hydrated with not less than 30 percent waterSodium sulfide, hydrated with not less than 30 percent water 8 UN1849 II Prohibited Prohibited
• Sodium superoxideSodium superoxide 5.1 UN2547 I Prohibited Prohibited
• Sodium tetranitrideSodium tetranitride Forbidden Prohibited Prohibited Prohibited Prohibited
• Solids containing corrosive liquid, n.o.s.Solids containing corrosive liquid, n.o.s. 8 UN3244 II 8A 8A
• Solids containing flammable liquid, n.o.s.Solids containing flammable liquid, n.o.s. 4.1 UN3175 II Prohibited 4A
• Solids containing toxic liquid, n.o.s.Solids containing toxic liquid, n.o.s. 6.1 UN3243 II Prohibited Prohibited
• Sounding devices, explosiveSounding devices, explosive 1.1D UN0374 II Prohibited Prohibited
• Spray paint (aerosol)Spray paint | Flammable aerosol | UN1950
• Stannic chloride, anhydrousStannic chloride, anhydrous 8 UN1827 II 8A 8A
• Stannic chloride, pentahydrateStannic chloride, pentahydrate 8 UN2440 III 8A 8A
• Stannic phosphideStannic phosphide 4.3 UN1433 I Prohibited Prohibited
• Stibine · USPSStibine 2.3 UN2676 n/a Prohibited Prohibited
• Strike-Anywhere MatchesStrike-anywhere matches may not be mailed domestically.
• Strong magnets (rare-earth, magnetic phone mounts, certain speakers, magnetic toys)Strong magnets — rare-earth magnets, magnetic phone mounts, certain speakers, magnetic toys
• Strontium arsenite · USPSStrontium arsenite 6.1 UN1691 II Prohibited Prohibited
• Strontium chlorateStrontium chlorate 5.1 UN1506 II 5A 5A
• Strontium nitrateStrontium nitrate 5.1 UN1507 III 5A 5A
• Strontium perchlorateStrontium perchlorate 5.1 UN1508 II 5A 5A
• Strontium peroxideStrontium peroxide 5.1 UN1509 II 5A 5A
• Strontium phosphideStrontium phosphide 4.3 UN2013 I Prohibited Prohibited
• Strychnine or Strychnine saltsStrychnine or Strychnine salts 6.1 UN1692 I Prohibited Prohibited
• Styrene monomer, stabilized · USPSStyrene monomer, stabilized 3 UN2055 III Prohibited 3A
• Substances, explosive, n.o.s.Substances, explosive, n.o.s. 1.1A UN0473 II Prohibited Prohibited
• Substances, explosive, very insensitive, n.o.s., or Substances, EVI, n.o.s.Substances, explosive, very insensitive, n.o.s., or Substances, EVI, n.o.s. 1.5D UN0482 II Prohibited Prohibited
• Substituted nitrophenol pesticides, liquid, flammable, toxic, flashpoint less than 23° CSubstituted nitrophenol pesticides, liquid, flammable, toxic, flashpoint less than 23° C 3 UN2780 I, II Prohibited Prohibited
• Sucrose octanitrate (dry)Sucrose octanitrate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Sulfamic acidSulfamic acid 8 UN2967 III 8A 8A
• SulfurSulfur 9 NA1350 III Prohibited Prohibited
• Sulfur and chlorate, loose mixtures ofSulfur and chlorate, loose mixtures of Forbidden Prohibited Prohibited Prohibited Prohibited
• Sulfur chloridesSulfur chlorides 8 UN1828 I Prohibited Prohibited
• Sulfur dioxideSulfur dioxide 2.3 UN1079 n/a Prohibited Prohibited
• Sulfur hexafluorideSulfur hexafluoride 2.2 UN1080 n/a 2B 2B
• Sulfur, moltenSulfur, molten 9 NA2448 III Prohibited Prohibited
• Sulfur tetrafluorideSulfur tetrafluoride 2.3 UN2418 n/a Prohibited Prohibited
• Sulfur trioxide, stabilizedSulfur trioxide, stabilized 8 UN1829 I Prohibited Prohibited
• Sulfuric acid, fuming with 30 percent or more free sulfur trioxideSulfuric acid, fuming with 30 percent or more free sulfur trioxide 8 UN1831 I Prohibited Prohibited
• Sulfuric acid, fuming with less than 30 percent free sulfur trioxideSulfuric acid, fuming with less than 30 percent free sulfur trioxide 8 UN1831 I Prohibited Prohibited
• Sulfuric acid, spentSulfuric acid, spent 8 UN1832 II Prohibited Prohibited
• Sulfuric acid (UN2796)Sulfuric Acid (UN2796): Acceptable only in solutions of 25 percent or less acid that can qualify as a Limited Quantity air or Limited Quantity surface material.
• Sulfuric acid with more than 51 percent acidSulfuric acid with more than 51 percent acid 8 UN1830 II Prohibited Prohibited
• Sulfuric acid with not more than 51 percent acidSulfuric acid with not more than 51 percent acid 8 UN2796 II 8A 8A
• Sulfurous acidSulfurous acid 8 UN1833 II 8A 8A
• Sulfuryl chlorideSulfuryl chloride 8 UN1834 I Prohibited Prohibited
• Sulfuryl fluorideSulfuryl fluoride 2.3 UN2191 n/a Prohibited Prohibited
• switchblade knifeA switchblade knife features a blade that opens automatically by hand pressure applied to a button or other device on the handle, or through inertia, gravity, or both.
• switchblade knife - manufacturer or dealer to authorized recipientsAuthorized manufacturers or bona fide dealers may mail switchblade knives to addresses within one of the categories listed above in connection with official procurement or resale.
• switchblade knife - to government procurement officialsGovernment Supply or Procurement Officials: Designated officers or employees ordering, procuring, or purchasing switchblade knives in connection with the activities of their respec
• Tars, liquid including road oils and cutback, bitumensTars, liquid including road oils and cutback, bitumens 3 UN1999 II, III Prohibited 3A
• Tear gasTear gas (UN1700, NA1693, and UN1693), except for those containing oleoresin capsicum.
• Tear gas candlesTear gas candles 6.1 UN1700 II Prohibited Prohibited
• Tear gas devices with more than 2 percent tear gas substances, by mass · USPSTear gas devices with more than 2 percent tear gas substances, by mass 6.1 NA1693 I, II Prohibited Prohibited
• Tear gas substances, liquid, n.o.s.Tear gas substances, liquid, n.o.s. 6.1 UN1693 I, II Prohibited Prohibited
• Tear gas substances, solid, n.o.s.Tear gas substances, solid, n.o.s. 6.1 UN3448 I, II Prohibited Prohibited
• Tellurium hexafluorideTellurium hexafluoride 2.3 UN2195 n/a Prohibited Prohibited
• Terpene hydrocarbons, n.o.s.Terpene hydrocarbons, n.o.s. 3 UN2319 III Prohibited 3A
• TerpinoleneTerpinolene 3 UN2541 III Prohibited 3A
• Tert-Butoxycarbonyl azideTert-Butoxycarbonyl azide Forbidden Prohibited Prohibited Prohibited Prohibited
• Tert-Butyl hydroperoxide, with more than 90 percent with waterTert-Butyl hydroperoxide, with more than 90 percent with water Forbidden Prohibited Prohibited Prohibited Prohibited
• Tert-Butyl hypochloriteTert-Butyl hypochlorite 4.2 UN3255 I Prohibited Prohibited
• Tert-Butyl isocyanateTert-Butyl isocyanate 6.1 UN2484 I Prohibited Prohibited
• tert-Butyl peroxyacetate, with more than 76 percent in solutiontert-Butyl peroxyacetate, with more than 76 percent in solution Forbidden Prohibited Prohibited Prohibited Prohibited
• tert-Butyl peroxyisobutyrate, with more than 77 percent in solutiontert-Butyl peroxyisobutyrate, with more than 77 percent in solution Forbidden Prohibited Prohibited Prohibited Prohibited
• tert-Butylcyclohexylchloroformatetert-Butylcyclohexylchloroformate 6.1 UN2747 III 6A 6A
• Tetraazido benzene quinoneTetraazido benzene quinone Forbidden Prohibited Prohibited Prohibited Prohibited
• TetrabromoethaneTetrabromoethane 6.1 UN2504 III 6A 6A
• TetrachloroethyleneTetrachloroethylene 6.1 UN1897 III 6A 6A
• Tetraethyl dithiopyrophosphateTetraethyl dithiopyrophosphate 6.1 UN1704 II Prohibited Prohibited
• Tetraethyl silicateTetraethyl silicate 3 UN1292 III Prohibited 3A
• Tetraethylammonium perchlorate (dry)Tetraethylammonium perchlorate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• TetraethylenepentamineTetraethylenepentamine 8 UN2320 III 8A 8A
• Tetrafluoroethylene, stabilizedTetrafluoroethylene, stabilized 2.1 UN1081 n/a Prohibited 2A
• Tetrafluoromethane or Refrigerant gas R 14Tetrafluoromethane or Refrigerant gas R 14 2.2 UN1982 n/a Prohibited Prohibited
• TetrahydrofuranTetrahydrofuran 3 UN2056 II Prohibited Prohibited
• TetrahydrofurfurylamineTetrahydrofurfurylamine 3 UN2943 III Prohibited 3A
• Tetrahydrophthalic anhydrides with more than 0.05 percent of maleic anhydrideTetrahydrophthalic anhydrides with more than 0.05 percent of maleic anhydride 8 UN2698 III 8A 8A
• TetrahydrothiopheneTetrahydrothiophene 3 UN2412 II Prohibited 3A
• Tetramethylammonium hydroxide, solidTetramethylammonium hydroxide, solid 8 UN3423 II 8A 8A
• Tetramethylammonium hydroxide, solutionTetramethylammonium hydroxide, solution 8 UN1835 II 8A 8A
• Tetramethylene diperoxide dicarbamideTetramethylene diperoxide dicarbamide Forbidden Prohibited Prohibited Prohibited Prohibited
• TetramethylsilaneTetramethylsilane 3 UN2749 I Prohibited Prohibited
• Tetranitro diglycerinTetranitro diglycerin Forbidden Prohibited Prohibited Prohibited Prohibited
• TetranitroanilineTetranitroaniline 1.1D UN0207 II Prohibited Prohibited
• TetranitromethaneTetranitromethane.
• Tetranitroresorcinol (dry)Tetranitroresorcinol (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• TetrapropylorthotitanateTetrapropylorthotitanate 3 UN2413 III Prohibited 3A
• Tetrazine (dry)Tetrazine (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Tetrazol-1-acetic acidTetrazol-1-acetic acid 1.4C UN0407 II Prohibited Prohibited
• Tetrazolyl azide (dry)Tetrazolyl azide (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Textile waste, wetTextile waste, wet 4.2 UN1857 III Prohibited Prohibited
• Thallium chlorateThallium chlorate 5.1 UN2573 II Prohibited Prohibited
• Thallium compounds, n.o.s.Thallium compounds, n.o.s. 6.1 UN1707 II Prohibited Prohibited
• Thallium nitrateThallium nitrate 6.1 UN2727 II Prohibited Prohibited
• Thioacetic acidThioacetic acid 3 UN2436 II Prohibited 3A
• Thiocarbamate pesticide, liquid, flammable, toxic, flashpoint less than 23° CThiocarbamate pesticide, liquid, flammable, toxic, flashpoint less than 23° C 3 UN2772 I, II Prohibited Prohibited
• Thioglycolic acidThioglycolic acid 8 UN1940 II 8A 8A
• ThiogylcolThiogylcol 6.1 UN2966 II Prohibited Prohibited
• Thiolactic acidThiolactic acid 6.1 UN2936 II Prohibited Prohibited
• Thionyl chlorideThionyl chloride 8 UN1836 I Prohibited Prohibited
• ThiopheneThiophene 3 UN2414 II Prohibited 3A
• ThiophosgeneThiophosgene 6.1 UN2474 II Prohibited Prohibited
• Thiophosphoryl chlorideThiophosphoryl chloride 8 UN1837 II Prohibited Prohibited
• Thiourea dioxideThiourea dioxide 4.2 UN3341 II, III Prohibited Prohibited
• Tinctures, medicinalTinctures, medicinal 3 UN1293 II, III Prohibited 3A
• Titanium disulphideTitanium disulphide 4.2 UN3174 III Prohibited Prohibited
• Titanium hydrideTitanium hydride 4.1 UN1871 II Prohibited Prohibited
• Titanium powder, dryTitanium powder, dry 4.2 UN2546 I, II, III Prohibited Prohibited
• Titanium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanicallyproduced,particlesize less than 53 microns; (b) chemically produced, particle size less than 840 microns · USPSTitanium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanicallyproduced,particlesize less than 53 microns; (b) chemically p
• Titanium sponge granules or Titanium sponge powdersTitanium sponge granules or Titanium sponge powders 4.1 UN2878 III Prohibited Prohibited
• Titanium tetrachlorideTitanium tetrachloride 8 UN1838 II Prohibited Prohibited
• Titanium trichloride mixturesTitanium trichloride mixtures 8 UN2869 II, III 8A 8A
• Titanium trichloride, pryophoric or Titanium trichloride mixtures, pyrophoricTitanium trichloride, pryophoric or Titanium trichloride mixtures, pyrophoric 4.2 UN2441 I Prohibited Prohibited
• Toluene · USPSToluene 3 UN1294 II Prohibited 3A
• Toluene diisocyanateToluene diisocyanate 6.1 UN2078 II Prohibited Prohibited
• Toluidines liquid · USPSToluidines liquid 6.1 UN1708 II Prohibited Prohibited
• Toluidines solidToluidines solid 6.1 UN3451 II Prohibited Prohibited
• Torpedoes, liquid fueled, with inert headTorpedoes, liquid fueled, with inert head 1.3J UN0450 II Prohibited Prohibited
• Torpedoes, liquid fueled, with or without bursting chargeTorpedoes, liquid fueled, with or without bursting charge 1.1J UN0449 II Prohibited Prohibited
• Torpedoes with bursting chargeTorpedoes with bursting charge 1.1D UN0451 II Prohibited Prohibited
• Toxic by inhalation liquid, corrosive, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50Toxic by inhalation liquid, corrosive, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50 6.1 UN3390 I Prohibi
• Toxic by inhalation liquid, corrosive, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50Toxic by inhalation liquid, corrosive, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50 6.1 UN3389 I Prohibi
• Toxic by inhalation liquid, flammable, corrosive, n.o.s. with an LC50 lower than or equal to 1000 ml/ m3 and saturated vapor concentration greater than or equal to 10 LC50 · USPSToxic by inhalation liquid, flammable, corrosive, n.o.s. with an LC50 lower than or equal to 1000 ml/ m3 and saturated vapor concentration greater than or equal to 10 LC50 6.1 UN34
• Toxic by inhalation liquid, flammable, corrosive, n.o.s. with an LC50 lower than or equal to 200 ml/ m3 and saturated vapor concentration greater than or equal to 500 LC50 · USPSToxic by inhalation liquid, flammable, corrosive, n.o.s. with an LC50 lower than or equal to 200 ml/ m3 and saturated vapor concentration greater than or equal to 500 LC50 6.1 UN34
• Toxic by inhalation liquid, flammable, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50Toxic by inhalation liquid, flammable, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50 6.1 UN3384 I Prohibi
• Toxic by inhalation liquid, flammable, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50Toxic by inhalation liquid, flammable, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50 6.1 UN3383 I Prohibi
• Toxic by inhalation liquid, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50Toxic by inhalation liquid, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50 6.1 UN3381 I Prohibited Prohibi
• Toxic by inhalation liquid, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50Toxic by inhalation liquid, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50 6.1 UN3382 I Prohibited Prohibi
• Toxic by inhalation liquid, oxidizing, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50Toxic by inhalation liquid, oxidizing, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50 6.1 UN3388 I Prohibi
• Toxic by inhalation liquid, oxidizing, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50Toxic by inhalation liquid, oxidizing, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50 6.1 UN3387 I Prohibi
• Toxic by inhalation liquid, water- reactive, flammable, n.o.s. with an LC50 lower than or equal to 1000 ml/ m3 and saturated vapor concentration greater than or equal to 10 LC50-Toxic by inhalation liquid, water- reactive, flammable, n.o.s. with an LC50 lower than or equal to 1000 ml/ m3 and saturated vapor concentration greater than or equal to 10 LC50- 6
• Toxic by inhalation liquid, water- reactive, flammable, n.o.s. with an LC50 lower than or equal to 200 ml/ m3 and saturated vapor concentration greater than or equal to 500 LC50- · USPSToxic by inhalation liquid, water- reactive, flammable, n.o.s. with an LC50 lower than or equal to 200 ml/ m3 and saturated vapor concentration greater than or equal to 500 LC50- 6
• Toxic by inhalation liquid, water- reactive, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50Toxic by inhalation liquid, water- reactive, n.o.s. with an LC50 lower than or equal to 1000 ml/m3 and saturated vapor concentration greater than or equal to 10 LC50 6.1 UN3386 I P
• Toxic by inhalation liquid, water- reactive, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50 · USPSToxic by inhalation liquid, water- reactive, n.o.s. with an LC50 lower than or equal to 200 ml/m3 and saturated vapor concentration greater than or equal to 500 LC50 6.1 UN3385 I P
• Toxic gases (Division 2.3)Toxic Gases: All Division 2.3 toxic gases are prohibited from mailing.
• Toxic liquid, corrosive, inorganic, n.o.s.Toxic liquid, corrosive, inorganic, n.o.s. 6.1 UN3289 I, II Prohibited Prohibited
• Toxic liquids, corrosive, organic, n.o.s.Toxic liquids, corrosive, organic, n.o.s. 6.1 UN2927 I, II Prohibited Prohibited
• Toxic liquids, flammable, organic, n.o.s.Toxic liquids, flammable, organic, n.o.s. 6.1 UN2929 I, II Prohibited Prohibited
• Toxic liquids, oxidizing, n.o.s.Toxic liquids, oxidizing, n.o.s. 6.1 UN3122 I, II Prohibited Prohibited
• Toxic liquids, water-reactive, n.o.s.Toxic liquids, water-reactive, n.o.s. 6.1 UN3123 I, II Prohibited Prohibited
• Toxic solid, corrosive, inorganic, n.o.s.Toxic solid, corrosive, inorganic, n.o.s. 6.1 UN3290 I, II Prohibited Prohibited
• Toxic solids, corrosive, organic, n.o.s.Toxic solids, corrosive, organic, n.o.s. 6.1 UN2928 I, II Prohibited Prohibited
• Toxic solids, flammable, organic, n.o.s.Toxic solids, flammable, organic, n.o.s. 6.1 UN2930 I, II Prohibited Prohibited
• Toxic solids, organic, n.o.sToxic solids, organic, n.o.s 6.1 UN2811 III 6A 6A
• Toxic solids, organic, n.o.s. · USPSToxic solids, organic, n.o.s. 6.1 UN2811 I, II Prohibited Prohibited
• Toxic solids, oxidizing, n.o.s.Toxic solids, oxidizing, n.o.s. 6.1 UN3086 I, II Prohibited Prohibited
• Toxic solids, self-heating, n.o.s.Toxic solids, self-heating, n.o.s. 6.1 UN3124 I, II Prohibited Prohibited
• Toxic solids, water-reactive, n.o.s.Toxic solids, water-reactive, n.o.s. 6.1 UN3125 I, II Prohibited Prohibited
• Toxic substances with LD50 oral toxicity greater than 5 mg/kg but no more than 50 mg/kgToxic Substances with LD 50 Oral Toxicity of 50 mg/kg or Less: Division 6.1 toxic substances having LD50 for oral toxicity greater than 5 mg/kg but less than or equal to 50 mg/kg a
• Toy capsToy caps 1.4S NA0337 II Prohibited Prohibited
• Toy Propellant Devices (UN0454 or NA0323, Division 1.4S)Toy Propellant Devices (e.g., model rocket motors or igniters) (UN0454 or NA0323): Classified as Division 1.4S, these devices may be mailed via surface transportation with prior wr
• Tracers for ammunitionTracers for ammunition 1.3G UN0212 II Prohibited Prohibited
• Tri-(b-nitroxyethyl) ammonium nitrate · USPSTri-(b-nitroxyethyl) ammonium nitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Triallyl borateTriallyl borate 6.1 UN2609 III 6A 6A
• TriallylamineTriallylamine 3 UN2610 III Prohibited Prohibited
• Triazine pesticides, liquid, flammable, toxic, flashpoint less than 23° CTriazine pesticides, liquid, flammable, toxic, flashpoint lessthan 23° C 3 UN2764 I, II Prohibited Prohibited
• Triazine pesticides, liquid, flammable, toxic, flashpoint lessthan 23° C · USPSTriazine pesticides, liquid, flammable, toxic, flashpoint lessthan 23° C 3 UN2764 I, II Prohibited Prohibited
• TributylamineTributylamine 6.1 UN2542 II Prohibited Prohibited
• TributylphosphaneTributylphosphane 4.2 UN3254 I Prohibited Prohibited
• Trichlorbenzenes, liquidTrichlorbenzenes, liquid 6.1 UN2321 III 6A 6A
• Trichloroacetic acidTrichloroacetic acid 8 UN1839 II 8A 8A
• Trichloroacetic acid, solutionTrichloroacetic acid, solution 8 UN2564 II, III 8A 8A
• Trichloroacetyl chlorideTrichloroacetyl chloride 8 UN2442 II Prohibited Prohibited
• TrichlorobuteneTrichlorobutene 6.1 UN2322 II Prohibited Prohibited
• TrichloroethyleneTrichloroethylene 6.1 UN1710 III 6A 6A
• Trichloroisocyanuric acid, dryTrichloroisocyanuric acid, dry 5.1 UN2468 II 5A 5A
• Trichloromethyl perchlorateTrichloromethyl perchlorate Forbidden Prohibited Prohibited Prohibited Prohibited
• TrichlorosilaneTrichlorosilane 4.3 UN1295 I Prohibited Prohibited
• Tricresyl phosphate with more than 3 percent ortho isomerTricresyl phosphate with more than 3 percent ortho isomer 6.1 UN2574 II Prohibited Prohibited
• Triethyl phosphiteTriethyl phosphite 3 UN2323 III Prohibited 3A
• TriethylamineTriethylamine 3 UN1296 II Prohibited Prohibited
• TriethylenetetramineTriethylenetetramine 8 UN2259 II 8A 8A
• Trifluoroacetic acidTrifluoroacetic acid 8 UN2699 I Prohibited Prohibited
• Trifluoroacetyl chlorideTrifluoroacetyl chloride 2.3 UN3057 n/a Prohibited Prohibited
• Trifluorochloroethylene, stabilizedTrifluorochloroethylene, stabilized 2.3 UN1082 n/a Prohibited Prohibited
• Trifluoromethane or Refrigerant gas R 23Trifluoromethane or Refrigerant gas R 23 2.2 UN1984 n/a 2B 2B
• Trifluoromethane, refrigerated liquidTrifluoromethane, refrigerated liquid 2.2 UN3136 n/a 2B 2B
• Triformoxime trinitrateTriformoxime trinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• TriisobutyleneTriisobutylene 3 UN2324 III Prohibited 3A
• Triisopropyl borateTriisopropyl borate 3 UN2616 II, III Prohibited 3A
• TrimethoxysilaneTrimethoxysilane 6.1 NA9269 I Prohibited Prohibited
• Trimethyl borateTrimethyl borate 3 UN2416 II Prohibited 3A
• Trimethyl phosphiteTrimethyl phosphite 3 UN2329 III Prohibited 3A
• Trimethylacetyl chlorideTrimethylacetyl chloride 6.1 UN2438 I Prohibited Prohibited
• Trimethylamine, anhydrousTrimethylamine, anhydrous 2.1 UN1083 n/a Prohibited 2A
• TrimethylchlorosilaneTrimethylchlorosilane 3 UN1298 II Prohibited Prohibited
• TrimethylcyclohexylamineTrimethylcyclohexylamine 8 UN2326 III 8A 8A
• Trimethylene glycol diperchlorateTrimethylene glycol diperchlorate Forbidden Prohibited Prohibited Prohibited Prohibited
• Trimethylhexamethylene diisocyanateTrimethylhexamethylene diisocyanate 6.1 UN2328 III 6A 6A
• TrimethylhexamethylenediaminesTrimethylhexamethylenediamines 8 UN2327 III 8A 8A
• Trimethylol nitromethane trinitrateTrimethylol nitromethane trinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Trinitro-m-cresolTrinitro-m-cresol 1.1D UN0216 II Prohibited Prohibited
• Trinitroacetic acidTrinitroacetic acid Forbidden Prohibited Prohibited Prohibited Prohibited
• TrinitroacetonitrileTrinitroacetonitrile Forbidden Prohibited Prohibited Prohibited Prohibited
• Trinitroamine cobaltTrinitroamine cobalt Forbidden Prohibited Prohibited Prohibited Prohibited
• Trinitroaniline or PicramideTrinitroaniline or Picramide 1.1D UN0153 II Prohibited Prohibited
• TrinitroanisoleTrinitroanisole 1.1D UN0213 II Prohibited Prohibited
• Trinitrobenzene, dry or wetted with less than 30 percent water, by massTrinitrobenzene, dry or wetted with less than 30 percent water, by mass 1.1D UN0214 II Prohibited Prohibited
• Trinitrobenzene, wetted, with not less than 10 percent water, by massTrinitrobenzene, wetted, with not less than 10 percent water, by mass 4.1 UN3367 I Prohibited Prohibited
• Trinitrobenzenesulfonic acidTrinitrobenzenesulfonic acid 1.1D UN0386 II Prohibited Prohibited
• Trinitrobenzoic acid, dry or wetted with less than 30 percent water, by massTrinitrobenzoic acid, dry or wetted with less than 30 percent water, by mass 1.1D UN0215 II Prohibited Prohibited
• Trinitrobenzoic acid, wetted with not less than 10 percent water, by massTrinitrobenzoic acid, wetted with not less than 10 percent water, by mass 4.4 UN3368 I Prohibited Prohibited
• Trinitrobenzoic acid, wetted with not less than 30 percent water, by massTrinitrobenzoic acid, wetted with not less than 30 percent water, by mass 4.1 UN1355 I Prohibited Prohibited
• Trinitrochlorobenzene or Picryl chlorideTrinitrochlorobenzene or Picryl chloride 1.1D UN0155 II Prohibited Prohibited
• Trinitrochlorobenzene (picryl chloride), wetted, with not less than 10 percent water by massTrinitrochlorobenzene (picryl chloride), wetted, with not less than 10 percent water by mass 4.1 UN3365 I Prohibited Prohibited
• TrinitroethanolTrinitroethanol Forbidden Prohibited Prohibited Prohibited Prohibited
• TrinitroethylnitrateTrinitroethylnitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• TrinitrofluorenoneTrinitrofluorenone 1.1D UN0387 II Prohibited Prohibited
• Trinitromethane · USPSTrinitromethane Forbidden Prohibited Prohibited
• TrinitronaphthaleneTrinitronaphthalene 1.1D UN0217 II Prohibited Prohibited
• TrinitrophenetoleTrinitrophenetole 1.1D UN0218 II Prohibited Prohibited
• Trinitrophenol or Picric acid, dry or wetted with less than 30 percent water, by massTrinitrophenol or Picric acid, dry or wetted with less than 30 percent water, by mass 1.1D UN0154 II Prohibited Prohibited
• Trinitrophenol (picric acid), wetted with not less than 10 percent water by massTrinitrophenol (picric acid), wetted with not less than 10 percent water by mass 4.1 UN3364 I Prohibited Prohibited
• Trinitrophenol, wetted with not less than 30 percent water, by massTrinitrophenol, wetted with not less than 30 percent water, by mass 4.1 UN1344 I Prohibited Prohibited
• Trinitrophenylmethylnitramine or TetrylTrinitrophenylmethylnitramine or Tetryl 1.1D UN0208 II Prohibited Prohibited
• Trinitroresorcinol or Styphnic acid, dry or wetted with less than 20 percent water, or mixture of alcohol and water, by massTrinitroresorcinol or Styphnic acid, dry or wetted with less than 20 percent water, or mixture of alcohol and water, by mass 1.1D UN0219 II Prohibited Prohibited
• Trinitroresorcinol, wetted or Styphnic acid, wetted with not less than 20 percent water, or mixture of alcohol and water, by massTrinitroresorcinol, wetted or Styphnic acid, wetted with not less than 20 percent water, or mixture of alcohol and water, by mass 1.1D UN0394 II Prohibited Prohibited
• Trinitrotetramine cobalt nitrateTrinitrotetramine cobalt nitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Trinitrotoluene and Trinitrobenzene mixtures or TNT and trinitrobenzene mixtures or TNT and hexanitrostilbene mixtures or Trinitrotoluene and hexanitrostilbene mixturesTrinitrotoluene and Trinitrobenzene mixtures or TNT and trinitrobenzene mixtures or TNT and hexanitrostilbene mixtures or Trinitrotoluene and hexanitrostilbene mixtures 1.1D UN0388
• Trinitrotoluene mixtures containing Trinitrobenzene and Hexanitrostilbene or TNT mixtures containing trinitrobenzene and hexanitrostilbeneTrinitrotoluene mixtures containing Trinitrobenzene and Hexanitrostilbene or TNT mixtures containing trinitrobenzene and hexanitrostilbene 1.1D UN0389 II Prohibited Prohibited
• Trinitrotoluene or TNT, dry or wetted with less than 30 percent water, by massTrinitrotoluene or TNT, dry or wetted with less than 30 percent water, by mass 1.1D UN0209 II Prohibited Prohibited
• Trinitrotoluene (TNT) wetted, with not less than 10 percent water by massTrinitrotoluene (TNT) wetted, with not less than 10 percent water by mass 4.1 UN3366 I Prohibited Prohibited
• Trinitrotoluene wetted with not less than 30 percent water, by massTrinitrotoluene wetted with not less than 30 percent water, by mass 4.1 UN1356 I Prohibited Prohibited
• TripropylamineTripropylamine 3 UN2260 III Prohibited 3A
• TripropyleneTripropylene 3 UN2057 II, III Prohibited 3A
• Tris, bis-bifluoroamino diethoxy propane (TVOPA)Tris, bis-bifluoroamino diethoxy propane (TVOPA) Forbidden Prohibited Prohibited Prohibited Prohibited
• TritonalTritonal 1.1D UN0390 II Prohibited Prohibited
• Tungsten hexafluorideTungsten hexafluoride 2.3 UN2196 n/a Prohibited Prohibited
• TurpentineTurpentine 3 UN1299 III Prohibited 3A
• UndecaneUndecane 3 UN2330 III Prohibited 3A
• Urea hydrogen peroxideUrea hydrogen peroxide 5.1 UN1511 III 5A 5A
• Urea nitrate, dry or wetted with less than 20 percent water, by massUrea nitrate, dry or wetted with less than 20 percent water, by mass 1.1D UN0220 II Prohibited Prohibited
• Urea nitrate, wetted with not less than 10 percent water, by massUrea nitrate, wetted with not less than 10 percent water, by mass 4.1 UN3370 I Prohibited Prohibited
• Urea nitrate, wetted with not less than 20 percent water, by massUrea nitrate, wetted with not less than 20 percent water, by mass 4.1 UN1357 I Prohibited Prohibited
• Used, damaged, or defective electronic devicesUsed, Damaged, or Defective Electronic Devices: Used, damaged, or defective electronic devices in international mail or domestic air transportation, except for new devices in origi
• Used health care products (not suspected to contain Category A)a used health care product not suspected to contain an infectious material, or that is known or suspected to contain a Category B infectious substance and is being returned to the
• Used healthcare products containing Category A infectious substanceUsed Healthcare Products: Used healthcare products containing a Category A infectious substance.
• ValeraldehydeValeraldehyde 3 UN2058 II Prohibited 3A
• Valeryl chlorideValeryl chloride 8 UN2502 II 8A 8A
• Vanadium compound, n.o.s.Vanadium compound, n.o.s. 6.1 UN3285 III 6A 6A
• Vanadium oxytrichlorideVanadium oxytrichloride 8 UN2443 II 8A 8A
• Vanadium pentoxide, non-fused formVanadium pentoxide, non-fused form 6.1 UN2862 III 6A 6A
• Vanadium tetrachlorideVanadium tetrachloride 8 UN2444 I Prohibited Prohibited
• Vanadium trichlorideVanadium trichloride 8 UN2475 III 8A 8A
• Vanadyl sulfateVanadyl sulfate 6.1 UN2931 II Prohibited Prohibited
• Vehicle, flammable gas powered or Vehicle, fuel cell, flammable gas poweredVehicle, flammable gas powered or Vehicle, fuel cell, flammable gas powered 9 UN3166 n/a Prohibited Prohibited
• Vehicle, flammable liquid powered or Vehicle, fuel cell, flammable liquid poweredVehicle, flammable liquid powered or Vehicle, fuel cell, flammable liquid powered 9 UN3166 n/a Prohibited Prohibited
• Vinyl acetate, stabilizedVinyl acetate, stabilized 3 UN1301 II Prohibited 3A
• Vinyl bromide, stabilizedVinyl bromide, stabilized 2.1 UN1085 n/a Prohibited 2A
• Vinyl butyrate, stabilizedVinyl butyrate, stabilized 3 UN2838 II Prohibited 3A
• Vinyl chloride, stabilizedVinyl chloride, stabilized 2.1 UN1086 n/a Prohibited 2A
• Vinyl chloroacetateVinyl chloroacetate 6.1 UN2589 II Prohibited Prohibited
• Vinyl ethyl ether, stabilizedVinyl ethyl ether, stabilized 3 UN1302 I Prohibited Prohibited
• Vinyl fluoride, stabilizedVinyl fluoride, stabilized 2.1 UN1860 n/a Prohibited 2A
• Vinyl isobutyl ether, stabilizedVinyl isobutyl ether, stabilized 3 UN1304 II Prohibited 3A
• Vinyl methyl ether, stabilizedVinyl methyl ether, stabilized 2.1 UN1087 n/a Prohibited 2A
• Vinyl nitrate polymerVinyl nitrate polymer Forbidden Prohibited Prohibited Prohibited Prohibited
• Vinylidene chloride, stabilizedVinylidene chloride, stabilized 3 UN1303 I Prohibited 3A
• Vinylpyridines, stabilizedVinylpyridines, stabilized 6.1 UN3073 II Prohibited Prohibited
• Vinyltoluenes, stabilizedVinyltoluenes, stabilized 3 UN2618 III Prohibited 3A
• Vinyltrichlorosilane, stabilizedVinyltrichlorosilane, stabilized 3 UN1305 I Prohibited Prohibited
• Warheads, rocket with burster or expelling chargeWarheads, rocket with burster or expelling charge 1.4D UN0370 II Prohibited Prohibited
• Warheads, rocket with bursting chargeWarheads, rocket with bursting charge 1.1D UN0286 II Prohibited Prohibited
• Warheads, torpedo with bursting chargeWarheads, torpedo with bursting charge 1.1D UN0221 II Prohibited Prohibited
• warm-blooded animals (cats, dogs, guinea pigs, hamsters, mice, rabbits, rats, squirrels)Warm-blooded animals, except for adult birds and specified day-old birds under the specific conditions in this section, are not mailable.
• Water-reactive liquid, n.o.s.Water-reactive liquid, n.o.s. 4.3 UN3148 I, II, III Prohibited Prohibited
• Water-reactive liquid, toxic, n.o.s.Water-reactive liquid, toxic, n.o.s. 4.3 UN3130 I, II, III Prohibited Prohibited
• Water-reactive solid, oxidizing, n.o.s.Water-reactive solid, oxidizing, n.o.s. 4.3 UN3133 II, III Prohibited Prohibited
• Water-reactive solid, self-heating, n.o.s.Water-reactive solid, self-heating, n.o.s. 4.3 UN3135 I, II, III Prohibited Prohibited
• Waxes and polishes (flammable or combustible liquid)Waxes and Polishes: Considered flammable or combustible liquids with varying flashpoints. It is mailable if they qualify as Limited Quantity surface materials
• White asbestos (chrysotile, actinolite, anthophyllite, tremolite)White asbestos (chrysotile, actinolite, anthophyllite, tremolite) 9 UN2590 III Prohibited 9C
• Wireless earbudsWireless earbuds | Lithium battery (packed with equipment) | UN3481
• Wood preservatives, liquidWood preservatives, liquid 3 UN1306 II, III Prohibited 3A
• Wool waste, wetWool waste, wet 4.2 UN1387 III Prohibited Prohibited
• XanthatesXanthates 4.2 UN3342 II, III Prohibited Prohibited
• Xenon, compressedXenon, compressed 2.2 UN2036 n/a 2B 2B
• Xenon, refrigerated liquid (cryogenic liquids)Xenon, refrigerated liquid (cryogenic liquids) 2.2 UN2591 n/a Prohibited Prohibited
• XylenesXylenes 3 UN1307 II, III Prohibited Prohibited
• Xylenols, liquidXylenols, liquid 6.1 UN3430 II Prohibited Prohibited
• Xylenols, solidXylenols, solid 6.1 UN2261 II Prohibited Prohibited
• Xylidines, liquidXylidines, liquid 6.1 UN1711 II Prohibited Prohibited
• Xylidines, solidXylidines, solid 6.1 UN3452 II Prohibited Prohibited
• Xylyl bromide, liquidXylyl bromide, liquid 6.1 UN1701 II Prohibited Prohibited
• Xylyl bromide, solidXylyl bromide, solid 6.1 UN3417 II Prohibited Prohibited
• Zinc ammonium nitrateZinc ammonium nitrate.
• Zinc ammonium nitriteZinc ammonium nitrite 5.1 UN1512 II Prohibited Prohibited
• Zinc arsenate or Zinc arsenite or Zinc arsenate and zinc arsenite mixturesZinc arsenate or Zinc arsenite or Zinc arsenate and zinc arsenite mixtures 6.1 UN1712 II Prohibited Prohibited
• Zinc ashesZinc ashes 4.3 UN1435 III Prohibited 4A
• Zinc bromateZinc bromate 5.1 UN2469 III 5A 5A
• Zinc chlorateZinc chlorate 5.1 UN1513 II 5A 5A
• Zinc chloride, anhydrousZinc chloride, anhydrous 8 UN2331 III Prohibited Prohibited
• Zinc chloride, solutionZinc chloride, solution 8 UN1840 III 8A 8A
• Zinc cyanideZinc cyanide 6.1 UN1713 I Prohibited Prohibited
• Zinc dithionite or Zinc hydrosulfiteZinc dithionite or Zinc hydrosulfite 9 UN1931 III Prohibited 9C
• Zinc fluorosilicateZinc fluorosilicate 6.1 UN2855 III 6A 6A
• Zinc nitrateZinc nitrate 5.1 UN1514 II 5A 5A
• Zinc permanganateZinc permanganate 5.1 UN1515 II 5A 5A
• Zinc peroxideZinc peroxide 5.1 UN1516 II 5A 5A
• Zinc phosphideZinc phosphide 4.3 UN1714 I Prohibited Prohibited
• Zinc powder or Zinc dustZinc powder or Zinc dust 4.3 UN1436 I, II, III Prohibited Prohibited
• Zinc resinateZinc resinate 4.1 UN2714 III Prohibited 4A
• Zirconium, dry, coiled wire, finished metal sheets, strip (thinner than 254 microns but not thinner than 18 microns)Zirconium, dry, coiled wire, finished metal sheets, strip (thinner than 254 microns but not thinner than 18 microns) 4.1 UN2858 III Prohibited 4A
• Zirconium, dry, finished sheets, strip or coiled wireZirconium, dry, finished sheets, strip or coiled wire 4.2 UN2009 III Prohibited Prohibited
• Zirconium hydrideZirconium hydride 4.1 UN1437 II Prohibited Prohibited
• Zirconium nitrateZirconium nitrate 5.1 UN2728 III 5A 5A
• Zirconium picramate, dry or wetted with less than 20 percent water, by massZirconium picramate, dry or wetted with less than 20 percent water, by mass 1.3C UN0236 II Prohibited Prohibited
• Zirconium picramate, wetted with not less than 20 percent water, by massZirconium picramate, wetted with not less than 20 percent water, by mass 4.1 UN1517 I Prohibited Prohibited

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