Records 1,601–2,000 — Mailing and air-carriage restrictions by item category

Records 1,601 to 2,000 of 3,204. Each links to its own page, which carries the source URL and the quoted line that states the value.

• Dinitroresorcinol, dry or wetted with less than 15 percent water, by massDinitroresorcinol, dry or wetted with less than 15 percent water, by mass 1.1D UN0078 II Prohibited Prohibited
• Dinitroresorcinol, wetted with not less than 15 percent water, by massDinitroresorcinol, wetted with not less than 15 percent water, by mass 4.1 UN1322 I Prohibited Prohibited
• DinitrosobenzeneDinitrosobenzene 1.3C UN0406 II Prohibited Prohibited
• Dinitrosobenzylamidine and salts of (dry)Dinitrosobenzylamidine and salts of (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Dinitrotoluenes, liquidDinitrotoluenes, liquid 6.1 UN2038 II Prohibited Prohibited
• Dinitrotoluenes, moltenDinitrotoluenes, molten 6.1 UN1600 II Prohibited Prohibited
• Dinitrotoluenes, solidDinitrotoluenes, solid 6.1 UN3454 II Prohibited Prohibited
• Dintro-o-cresolDintro-o-cresol 6.1 UN1598 II Prohibited Prohibited
• DioxaneDioxane 3 UN1165 II Prohibited 3A
• DioxolaneDioxolane 3 UN1166 II Prohibited 3A
• DipenteneDipentene 3 UN2052 III Prohibited 3A
• Diphenylamine chloroarsineDiphenylamine chloroarsine 6.1 UN1698 I Prohibited Prohibited
• Diphenylchloroarsine, liquidDiphenylchloroarsine, liquid 6.1 UN1699 I Prohibited Prohibited
• Diphenylchloroarsine, solidDiphenylchloroarsine, solid 6.1 UN3450 I Prohibited Prohibited
• DiphenyldichlorosilaneDiphenyldichlorosilane 8 UN1769 II Prohibited Prohibited
• Diphenylmethyl bromideDiphenylmethyl bromide 8 UN1770 II 8A 8A
• Dipicryl sulfide, dry or wetted with less than 10 percent water, by massDipicryl sulfide, dry or wetted with less than 10 percent water, by mass 1.1D UN0401 II Prohibited Prohibited
• Dipicryl sulfide, wetted with not less than 10 percent water, by massDipicryl sulfide, wetted with not less than 10 percent water, by mass 4.1 UN2852 I Prohibited Prohibited
• Dipropionyl peroxide, with more than 28 percent in solutionDipropionyl peroxide, with more than 28 percent in solution Forbidden Prohibited Prohibited Prohibited Prohibited
• Dipropyl ketoneDipropyl ketone 3 UN2710 III Prohibited 3A
• DipropylamineDipropylamine 3 UN2383 II Prohibited Prohibited
• Disodium trioxosilicateDisodium trioxosilicate 8 UN3253 III 8A 8A
• Divinyl ether, stabilizedDivinyl ether, stabilized 3 UN1167 I Prohibited Prohibited
• Division 2.1 Flammable Gases — domestic airDivision 2.1 (flammable gases) and Division 2.3 (toxic gases) are prohibited.
• Division 2.1 Flammable Gases — domestic surfaceDivision 2.1 (flammable gases) and Division 2.2 (nonflammable gases) are generally permitted if the material can qualify as a Limited Quantity surface material and meet the quantit
• Division 2.2 Nonflammable Gases — domestic airDivision 2.2 (nonflammable gases) are generally permitted if the material can qualify as an ID8000 material
• Division 2.3 Toxic Gases — domestic airDivision 2.1 (flammable gases) and Division 2.3 (toxic gases) are prohibited.
• Division 2.3 Toxic Gases — domestic surfaceDivision 2.3 (toxic gases) are prohibited.
• Division 6.1 toxic substances — international mailInternational Mail: Division 6.1 toxic substances or poisons and irritating materials are prohibited.
• Division 6.1 toxic substances qualifying as Limited Quantity/consumer commodityDomestic Mail via Air or Surface Transportation: Division 6.1 toxic substance or poison that can qualify as a Limited Quantity/consumer commodity material is permitted when package
• DodecyltrichlorosilaneDodecyltrichlorosilane 8 UN1771 II Prohibited Prohibited
• Drain cleanerDrain cleaner | Corrosive | UN1824
• drug paraphernaliaMailing drug paraphernalia is illegal under the Controlled Substances Act. Any article deemed unlawful under the Controlled Substances Act is prohibited from mailing
• Dry IcePackages containing dry ice must be packed in containers that permit the release of carbon dioxide gas.
• Dry Ice (carbon dioxide solid)ps://pe.usps.com/text/pub52/pub52apxc_029.htm#ep1000804> 9A Dry Ice (Carbon Dioxide Solid) <https://pe.usps.com/text/pub52/pub52apxc_030.htm#ep1000830> 9B Magnetized Materials <htt
• Dry ice — domestic airDomestic Mail via Air Transportation: Dry ice is permitted in quantities of up to 5 pounds per mailpiece.
• Dry ice — domestic surfaceDomestic Mail via Surface Transportation: Dry ice is permitted and must comply with Packaging Instruction 9A
• Dry ice — international mailInternational Mail: Dry ice is prohibited.
• Dyes (UN2801, UN3147)Dyes (UN2801, UN3147): Acceptable if the dyes qualify as Limited Quantity air or Limited Quantity surface material
• Electronic Nicotine Delivery System (ENDS)Electronic Nicotine Delivery System (ENDS): Any electronic device that delivers nicotine, flavor, or any other substance through an aerosolized solution.
• Electronic tubes charged with gasElectronic Tubes: These items are mailable without restriction if the volume does not exceed 30 cubic inches and the tube is charged with gas at 35 psig or less.
• Electronics with a lithium batteryEssential oils, nail polish (and nail polish remover), perfumes and colognes, hand sanitizer, inks, stains and varnishes, hairspray, and electronics with a lithium battery are amon
• Electronics with built-in lithium-ion batteries (phones, tablets, smartwatches, drones, cordless tools, toys with coin cells)Batteries — anything with a lithium-ion, lithium-metal, or lithium-polymer battery: phones, laptops, tablets, power banks, earbuds, smartwatches, drones, cordless tools, toys with
• Electronics with lithium-ion batteriesregulated contents (perfume, nail polish, aerosol sprays, electronics with lithium-ion batteries)
• Elevated temperature liquid, flammable, n.o.s., with flashpoint above 37.8° C, at or above its flashpointElevated temperature liquid, flammable, n.o.s., with flashpoint above 37.8° C, at or above its flashpoint 3 UN3256 III Prohibited Prohibited
• Elevated temperature liquid, n.o.s., at or above 100° C and below its flashpoint (including molten metals, molten salts, etc.)Elevated temperature liquid, n.o.s., at or above 100° C and below its flashpoint (including molten metals, molten salts, etc.) 9 UN3257 III Prohibited Prohibited
• Elevated temperature solid, n.o.s., at or above 240° C, see 49 CFR 173.247(h)(4) · USPSElevated temperature solid, n.o.s., at or above 240° C, see 49 CFR 173.247(h)(4) 9 UN3258 III Prohibited Prohibited
• Empty compressed gas containers — unused/newEmpty, unused (i.e., new) containers are mailable without restriction.
• Empty compressed gas containers — usedEmpty, used containers are mailable under the same restrictions as when filled (because residual amounts of the hazardous material might remain present).
• Engines, internal combustion, flammable gas poweredEngines, internal combustion, flammable gas powered 9 UN3166 n/a Prohibited Prohibited
• Engines, internal combustion, flammable liquid poweredEngines, internal combustion, flammable liquid powered 9 UN3166 n/a Prohibited Prohibited
• Environmentally hazardous substances, liquid, n.o.s.Environmentally hazardous substances, liquid, n.o.s. 9 UN3082 III 9C 9C
• Environmentally hazardous substances, solid, n.o.s.Environmentally hazardous substances, solid, n.o.s. 9 UN3077 III 9C 9C
• EpibromohydrinEpibromohydrin 6.1 UN2558 I Prohibited Prohibited
• EpichlorohydrinEpichlorohydrin 6.1 UN2023 II Prohibited Prohibited
• Essential oilsEssential oils, nail polish (and nail polish remover), perfumes and colognes, hand sanitizer, inks, stains and varnishes, hairspray, and electronics with a lithium battery are amon
• Esters, n.o.s.Esters, n.o.s. 3 UN3272 II, III Prohibited 3A
• Ethane · USPSEthane 2.1 UN1035 n/a Prohibited 2A
• Ethane-Propane mixture, refrigerated liquidEthane-Propane mixture, refrigerated liquid 2.1 NA1961 n/a Prohibited Prohibited
• Ethane, refrigerated liquidEthane, refrigerated liquid 2.1 UN1961 n/a Prohibited Prohibited
• Ethanol amine dinitrate · USPSEthanol amine dinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Ethanol and gasoline mixture or Ethanol and motor spirit mixture or Ethanol and petrol mixture, with more than 10% ethanol.Ethanol and gasoline mixture or Ethanol and motor spirit mixture or Ethanol and petrol mixture, with more than 10% ethanol. 3 UN3475 II Prohibited Prohibited
• Ethanol-based flammable liquids or solidsFlammable liquids or solids containing ethanol (ethyl alcohol) are mailable by domestic air only with prior written authorization.
• Ethanolamine or Ethanolamine solutionsEthanolamine or Ethanolamine solutions 8 UN2491 III 8A 8A
• Ethers, n.o.s.Ethers, n.o.s. 3 UN3271 II, III Prohibited 3A
• Ethyl 2-chloropropionateEthyl 2-chloropropionate 3 UN2935 III Prohibited 3A
• Ethyl acetateEthyl acetate 3 UN1173 II Prohibited 3A
• Ethyl acrylate, stabilizedEthyl acrylate, stabilized 3 UN1917 II Prohibited 3A
• Ethyl amyl ketoneEthyl amyl ketone 3 UN2271 III Prohibited 3A
• Ethyl borateEthyl borate 3 UN1176 II Prohibited 3A
• Ethyl bromideEthyl bromide 3 UN1891 II, III Prohibited 3A
• Ethyl bromoacetateEthyl bromoacetate 6.1 UN1603 II Prohibited Prohibited
• Ethyl butyl etherEthyl butyl ether 3 UN1179 II Prohibited 3A
• Ethyl butyrateEthyl butyrate 3 UN1180 III Prohibited 3A
• Ethyl chlorideEthyl chloride 2.1 UN1037 n/a Prohibited Prohibited
• Ethyl chloroacetateEthyl chloroacetate 6.1 UN1181 II Prohibited Prohibited
• Ethyl chloroformateEthyl chloroformate 6.1 UN1182 I Prohibited Prohibited
• Ethyl chlorothioformateEthyl chlorothioformate 8 UN2826 II Prohibited Prohibited
• Ethyl crotonateEthyl crotonate 3 UN1862 II Prohibited 3A
• Ethyl fluoride or Refrigerant gas R 161Ethyl fluoride or Refrigerant gas R 161 2.1 UN2453 n/a Prohibited 2A
• Ethyl formateEthyl formate 3 UN1190 II Prohibited 3A
• Ethyl hydroperoxideEthyl hydroperoxide Forbidden Prohibited Prohibited Prohibited Prohibited
• Ethyl isobutyrateEthyl isobutyrate 3 UN2385 II Prohibited 3A
• Ethyl isocyanateEthyl isocyanate 3 UN2481 I Prohibited Prohibited
• Ethyl lactateEthyl lactate 3 UN1192 III Prohibited 3A
• Ethyl mercaptanEthyl mercaptan 3 UN2363 I Prohibited Prohibited
• Ethyl methacrylate, stabilizedEthyl methacrylate, stabilized 3 UN2277 II Prohibited 3A
• Ethyl methyl etherEthyl methyl ether 2.1 UN1039 n/a Prohibited Prohibited
• Ethyl methyl ketone or Methyl ethyl ketoneEthyl methyl ketone or Methyl ethyl ketone 3 UN1193 II Prohibited 3A
• Ethyl nitrate solutionsEthyl nitrate solutions 3 UN1194 I Prohibited Prohibited
• Ethyl orthoformateEthyl orthoformate 3 UN2524 III Prohibited 3A
• Ethyl oxalateEthyl oxalate 6.1 UN2525 III 6A 6A
• Ethyl perchlorateEthyl perchlorate Forbidden Prohibited Prohibited Prohibited Prohibited
• Ethyl phosphonothioic dichloride, anhydrousEthyl phosphonothioic dichloride, anhydrous 6.1 NA2927 I Prohibited Prohibited
• Ethyl phosphonous dichloride, anhydrous pyrophoric liquidEthyl phosphonous dichloride, anhydrous pyrophoric liquid 6.1 NA2845 I Prohibited Prohibited
• Ethyl phosphorodichloridateEthyl phosphorodichloridate 6.1 NA2927 I Prohibited Prohibited
• Ethyl propionateEthyl propionate 3 UN1195 II Prohibited 3A
• Ethyl propyl etherEthyl propyl ether 3 UN2615 II Prohibited 3A
• Ethylacetylene, stabilizedEthylacetylene, stabilized 2.1 UN2452 n/a Prohibited Prohibited
• EthylamineEthylamine 2.1 UN1036 n/a Prohibited Prohibited
• Ethylamine, aqueous solution with not less than 50 percent but not more than 70 percent ethylamineEthylamine, aqueous solution with not less than 50 percent but not more than 70 percent ethylamine 3 UN2270 II Prohibited Prohibited
• EthylbenzeneEthylbenzene 3 UN1175 II Prohibited 3A
• EthyldichloroarsineEthyldichloroarsine 6.1 UN1892 I Prohibited Prohibited
• EthyldichlorosilaneEthyldichlorosilane 4.3 UN1183 I Prohibited Prohibited
• EthyleneEthylene 2.1 UN1962 n/a Prohibited 2A
• Ethylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propyleneEthylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylen
• Ethylene chlorohydrinEthylene chlorohydrin 6.1 UN1135 I Prohibited Prohibited
• Ethylene diamine diperchlorateEthylene diamine diperchlorate Forbidden Prohibited Prohibited Prohibited Prohibited
• Ethylene dibromideEthylene dibromide 6.1 UN1605 I Prohibited Prohibited
• Ethylene dichlorideEthylene dichloride 3 UN1184 II Prohibited Prohibited
• Ethylene glycol diethyl etherEthylene glycol diethyl ether 3 UN1153 III Prohibited 3A
• Ethylene glycol dinitrateEthylene glycol dinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Ethylene glycol monoethyl etherEthylene glycol monoethyl ether 3 UN1171 III Prohibited 3A
• Ethylene glycol monoethyl ether acetateEthylene glycol monoethyl ether acetate 3 UN1172 III Prohibited 3A
• Ethylene glycol monomethyl etherEthylene glycol monomethyl ether 3 UN1188 III Prohibited 3A
• Ethylene glycol monomethyl ether acetateEthylene glycol monomethyl ether acetate 3 UN1189 III Prohibited 3A
• Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxideEthylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxide 2.1 UN1041 n/a Prohibited 2A
• Ethylene oxide and carbon dioxide mixtures with more than 87 percent ethylene oxideEthylene oxide and carbon dioxide mixtures with more than 87 percent ethylene oxide 2.3 UN3300 n/a Prohibited Prohibited
• Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxideEthylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide 2.2 UN1952 n/a 2B 2B
• Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxideEthylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxide 2.2 UN3297 n/a 2B 2B
• Ethylene oxide and dichlorodifluoromethane mixture with not more than 12.5 percent ethylene oxideEthylene oxide and dichlorodifluoromethane mixture with not more than 12.5 percent ethylene oxide 2.2 UN3070 n/a 2B 2B
• Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxideEthylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxide 2.2 UN3298 n/a 2B 2B
• Ethylene oxide and propylene oxide mixtures with not more than 30 percent ethylene oxideEthylene oxide and propylene oxide mixtures with not more than 30 percent ethylene oxide 3 UN2983 I Prohibited Prohibited
• Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxideEthyleneoxideandtetrafluoroethane mixture with not more than 5.6 percent ethylene oxide 2.2 UN3299 n/a 2B 2B
• Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° CEthylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C 2.3 UN1040 n/a Prohibited Prohibited
• Ethylene, refrigerated liquid (cryogenic liquid)Ethylene, refrigerated liquid (cryogenic liquid) 2.1 UN1038 n/a Prohibited Prohibited
• EthylenediamineEthylenediamine 8 UN1604 II 8A 8A
• Ethyleneimine, stabilizedEthyleneimine, stabilized 6.1 UN1185 I Prohibited Prohibited
• Ethyleneoxideandtetrafluoroethane mixture with not more than 5.6 percent ethylene oxide · USPSEthyleneoxideandtetrafluoroethane mixture with not more than 5.6 percent ethylene oxide 2.2 UN3299 n/a 2B 2B
• EthylphenyldichlorosilaneEthylphenyldichlorosilane 8 UN2435 II Prohibited Prohibited
• EthyltrichlorosilaneEthyltrichlorosilane 3 UN1196 II Prohibited Prohibited
• Excessive dry ice — domestic air (over 5 lbs)Excessive Dry Ice: Dry ice exceeding 5 pounds per mailpiece is prohibited from air transport in domestic mail.
• Exempt human or animal specimensExempt human or animal specimens as defined in 346.12 (d), are not regulated as hazardous materials but must be packaged to meet mailing standards, including being triple-packaged
• Explosive, blasting, type A · USPSExplosive, blasting, type A 1.1D UN0081 II Prohibited Prohibited
• Explosive, blasting, type BExplosive, blasting, type B 1.1D UN0082 II Prohibited Prohibited
• Explosive, blasting, type B or Agent blasting, Type BExplosive, blasting, type B or Agent blasting, Type B 1.5D UN0331 II Prohibited Prohibited
• Explosive, blasting, type CExplosive, blasting, type C 1.1D UN0083 II Prohibited Prohibited
• Explosive, blasting, type DExplosive, blasting, type D 1.1D UN0084 II Prohibited Prohibited
• Explosive, blasting, type EExplosive, blasting, type E 1.1D UN0241 II Prohibited Prohibited
• Explosive, blasting, type E or Agent blasting, Type EExplosive, blasting, type E or Agent blasting, Type E 1.5D UN0332 II Prohibited Prohibited
• Explosive, forbidden. See 49 CFR 173.54Explosive, forbidden. See 49 CFR 173.54 Forbidden Prohibited Prohibited Prohibited Prohibited
• Explosivesan't send these items in the U.S. mail: Air Bags Ammunition Explosives Gasoline Liquid Mercury Marijuana (medical or otherwise); hemp/CBD is allowed, but restricted Domestically Re
• Explosives (Hazard Class 1) — domestic airDomestic Mail via Air Transportation: All explosives are prohibited.
• Explosives (Hazard Class 1) — domestic surfaceDomestic Mail via Surface Transportation: Generally, explosives are prohibited, with exceptions for Division 1.4S toy propellant devices and safety fuses that have been approved by
• Explosives (Hazard Class 1) — international mailInternational Mail : All explosives are prohibited.
• Extracts, liquid, flavor, or aromaExtracts, liquid, flavor, or aroma 3 UN1197 II, III Prohibited 3A
• Ferric arsenate · USPSFerric arsenate 6.1 UN1606 II Prohibited Prohibited
• Ferric arseniteFerric arsenite 6.1 UN1607 II Prohibited Prohibited
• Ferric chloride, anhydrousFerric chloride, anhydrous 8 UN1773 III 8A 8A
• Ferric chloride, solutionFerric chloride, solution 8 UN2582 III 8A 8A
• Ferric nitrateFerric nitrate 5.1 UN1466 III 5A 5A
• FerroceriumFerrocerium 4.1 UN1323 II Prohibited 4A
• Ferrosilicon, with 30 percent or more but less than 90 percent siliconFerrosilicon, with 30 percent or more but less than 90 percent silicon 4.3 UN1408 III Prohibited 4A
• Ferrous arsenateFerrous arsenate 6.1 UN1608 II Prohibited Prohibited
• Ferrous chloride, solidFerrous chloride, solid 8 NA1759 II 8A 8A
• Ferrous chloride, solutionFerrous chloride, solution 8 NA1760 II 8A 8A
• Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heatingFerrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating 4.2 UN2793 III Prohibited Prohibited
• Fertilizer ammoniating solution with free ammoniaFertilizer ammoniating solution with free ammonia 2.2 UN1043 n/a 2B 2B
• Fiber, vegetable, dryFiber, vegetable, dry 4.1 UN3360 III Prohibited Prohibited
• Fibers, animal or Fibers, vegetable burnt, wet or dampFibers, animal or Fibers, vegetable burnt, wet or damp 4.2 UN1372 III Prohibited Prohibited
• Fibers or Fabrics, animal or vegetable or Synthetic, n.o.s. with animal or vegetable oilFibers or Fabrics, animal or vegetable or Synthetic, n.o.s. with animal or vegetable oil 4.2 UN1373 III Prohibited Prohibited
• Fibers or Fabrics impregnated with weakly nitrated nitrocellulose, n.o.s.Fibers or Fabrics impregnated with weakly nitrated nitrocellulose, n.o.s. 4.1 UN1353 III Prohibited Prohibited
• Films, nitrocellulose base, gelatine coated (except scrap)Films, nitrocellulose base, gelatine coated (except scrap) 4.1 UN1324 III Prohibited Prohibited
• Fire extinguisher charges, corrosive liquidFire extinguisher charges, corrosive liquid 8 UN1774 II 8A 8A
• Fire extinguishers containing compressed or liquified gasFire extinguishers containing compressed or liquified gas 2.2 UN1044 n/a 2C 2C
• Fire extinguishers containing propellant explosives (UN0275, UN0276, UN0323, UN0381)Fire Extinguishers (UN0275, UN0276, UN0323, or UN0381): Fire extinguishers that contain propellant explosives are prohibited from mailing.
• Fire Extinguishers (UN1044) — Division 2.2 nonflammable compressed gasFire Extinguishers (UN1044): Division 2.2 nonflammable compressed gas. Fire extinguishers that contain nonflammable compressed gas are mailable if they do not contain methyl bromid
• FirearmsEven though unloaded rifles and shotguns are mailable, mailers must comply with applicable regulations.
• firearms - handguns (including pistols and revolvers)Pistols, revolvers, and other firearms capable of being concealed on a person, including but not limited to, short-barreled shotguns and short-barreled rifles, are categorized as h
• firearms - short-barreled shotgun or rifleA shotgun with one or more barrels less than 18 inches long or a rifle with one or more barrels less than 16 inches long.
• Firelighters, solid with flammable liquidFirelighters, solid with flammable liquid 4.1 UN2623 III Prohibited Prohibited
• FireworksFireworks 1.1G UN0333 II Prohibited Prohibited
• Fireworks (Division 1.1, 1.2, 1.3, or 1.4)All types of fireworks are prohibited from mailing.
• First aid kitsFirst aid kits 9 UN3316 Prohibited 9C
• Fish meal, stabilized or Fish scrap, stabilizedFish meal, stabilized or Fish scrap, stabilized 9 UN2216 III 9C 9C
• Fish meal, unstabilized or Fish scrap, unstabilizedFish meal, unstabilized or Fish scrap, unstabilized 4.2 UN1374 II Prohibited Prohibited
• Flammable liquid, toxic, corrosive, n.o.s.Flammable liquid, toxic, corrosive, n.o.s. 3 UN3286 I, II Prohibited Prohibited
• Flammable liquids (Hazard Class 3) — domestic airDomestic Mail via Air Transportation: Flammable liquids are prohibited.
• Flammable liquids (Hazard Class 3) — international mailInternational Mail: Flammable liquids are prohibited.
• Flammable liquids, n.o.s.Flammable liquids, n.o.s. 3 UN1993 I, II, III Prohibited 3A
• Flammable liquids with flashpoint above 20 F — domestic surfaceOther flammable liquids may be mailed if they qualify as a Limited Quantity surface material and meet the criteria in Exhibit 343.21
• Flammable liquids with flashpoint at or below 20 F — domestic surfaceDomestic Mail via Surface Transportation: Flammable liquids with a flashpoint at or below 20° F (-7° C) are prohibited.
• Flammable Nail PolishesSome nail polishes may only be sent by ground transportation.
• Flammable or Combustible PaintFlammable or combustible paint and paint-related items are generally accepted for mailing, provided the material can qualify as a consumer commodity material or ORM-D (for surface
• Flammable solid, corrosive, inorganic, n.o.s.Flammable solid, corrosive, inorganic, n.o.s. 4.1 UN3180 II, III Prohibited 4A
• Flammable solid, inorganic, n.o.s.Flammable solid, inorganic, n.o.s. 4.1 UN3178 II, III Prohibited 4A
• Flammable solid, organic, molten, n.o.s.Flammable solid, organic, molten, n.o.s. 4.1 UN3176 II, III Prohibited 4A
• Flammable solid, oxidizing, n.o.s.Flammable solid, oxidizing, n.o.s. 4.1 UN3097 II, III Prohibited Prohibited
• Flammable solid, toxic, inorganic, n.o.s.Flammable solid, toxic, inorganic, n.o.s. 4.1 UN3179 II, III Prohibited 4A
• Flammable solids (Hazard Class 4) — domestic airDomestic Mail via Air Transportation: All flammable solids are prohibited.
• Flammable solids (Hazard Class 4) — international mailInternational Mail: All flammable solids are prohibited.
• Flammable solids, organic, n.o.s.Flammable solids, organic, n.o.s. 4.1 UN1325 II, III Prohibited 4A
• Flammable solids qualifying as Limited Quantity surface materialsDomestic Mail via Surface Transportation: Flammable solids that qualify as Limited Quantity surface materials are permitted.
• Flares, aerialFlares, aerial 1.1G UN0420 II Prohibited Prohibited
• Flares, surfaceFlares, surface 1.1G UN0418 II Prohibited Prohibited
• Flash powderFlash powder 1.3G UN0305 II Prohibited Prohibited
• Fluorine, compressed · USPSFluorine, compressed 2.3 UN1045 n/a Prohibited Prohibited
• Fluoroacetic acidFluoroacetic acid 6.1 UN2642 I Prohibited Prohibited
• FluoroanilinesFluoroanilines 6.1 UN2941 III 6A 6A
• FluorobenzeneFluorobenzene 3 UN2387 II Prohibited 3A
• Fluoroboric acidFluoroboric acid 8 UN1775 II 8A 8A
• Fluorophosphoric acid anhydrousFluorophosphoric acid anhydrous 8 UN1776 II Prohibited Prohibited
• Fluorosilicates, n.o.s.Fluorosilicates, n.o.s. 6.1 UN2856 III 6A 6A
• Fluorosilicic acidFluorosilicic acid 8 UN1778 II Prohibited Prohibited
• Fluorosulfonic acidFluorosulfonic acid 8 UN1777 I Prohibited Prohibited
• FluorotoluenesFluorotoluenes 3 UN2388 II Prohibited 3A
• Foodstuffs and soaps in pressurized containersFoodstuffs and Soaps: These items are mailable if packaged in accordance with Packaging Instruction 2D
• Forbidden materials, see 49 CFR 173.21 · USPSForbidden materials, see 49 CFR 173.21 Forbidden Prohibited Prohibited Prohibited Prohibited
• Formaldehyde, solutions, flammableFormaldehyde, solutions, flammable 3 UN1198 III Prohibited 3A
• Formaldehyde, solutions, with not less than 25 percent formaldehydeFormaldehyde, solutions, with not less than 25 percent formaldehyde 8 UN2209 III 8A 8A
• Formic acidFormic acid 8 UN1779 II 8A 8A
• Formic acid with not less than 5 percent but less than 10 percent acid by massFormic acid with not less than 5 percent but less than 10 percent acid by mass 8 UN3412 III 8A 8A
• Formic acid with not less than 10 percent but not more than 85 percent acid by mass · USPSFormic acid with not less than 10 percent but not more than 85 percent acid by mass 8 UN3412 II Prohibited Prohibited
• Fracturing devices, explosives, without detonators for oil wellsFracturing devices, explosives, without detonators for oil wells 1.1D UN0099 II Prohibited Prohibited
• Fuel, aviation, turbine engineFuel, aviation, turbine engine 3 UN1863 I, II, III Prohibited 3A
• Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing water- reactive substancesFuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing water- reactive substances 4.3 UN3476 Prohibited Prohib
• Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing corrosive substances · USPSFuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing corrosive substances 8 UN3477 8A 8A
• Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing flammable liquids · USPSFuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing flammable liquids 3 UN3473 Prohibited 3A
• Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing hydrogen in metal hydride · USPSFuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing hydrogen in metal hydride 2.1 UN3479 Prohibited Prohibi
• Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing liquified flammable gas · USPSFuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing liquified flammable gas 2.1 UN3478 Prohibited Prohibite
• Fuel oil (NA1993)Fuel Oil (NA1993): A flammable liquid with a typical flashpoint below 100° F (38° C) is mailable if it qualifies as a Limited Quantity surface material
• Fuel oil (No. 1, 2, 4, 5, or 6)Fuel oil (No. 1, 2, 4, 5, or 6) 3 NA1993 III Prohibited 3A
• Fulminate of mercury (dry)Fulminate of mercury (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Fulminating gold · USPSFulminating gold Forbidden Prohibited Prohibited Prohibited Prohibited
• Fulminating mercuryFulminating mercury Forbidden Prohibited Prohibited Prohibited Prohibited
• Fulminating platinumFulminating platinum Forbidden Prohibited Prohibited Prohibited Prohibited
• Fulminating silverFulminating silver Forbidden Prohibited Prohibited Prohibited Prohibited
• Fulminic acidFulminic acid Forbidden Prohibited Prohibited Prohibited Prohibited
• Fumaryl chlorideFumaryl chloride 8 UN1780 II 8A 8A
• Fuming and spent sulfuric acids (UN1831, UN1832)Fuming and Spent Sulfuric Acids (UN1831, UN1832).
• FuraldehydesFuraldehydes 6.1 UN1199 II Prohibited Prohibited
• FuranFuran 3 UN2389 I Prohibited Prohibited
• Furfuryl alcoholFurfuryl alcohol 6.1 UN2874 III 6A 6A
• FurfurylamineFurfurylamine 3 UN2526 III Prohibited 3A
• Fuse, igniter tubular metal cladFuse, igniter tubular metal clad 1.4G UN0103 II Prohibited Prohibited
• Fuse, non-detonating (instantaneous or quickmatch)Fuse, non-detonating (instantaneous or quickmatch) 1.3G UN0101 II Prohibited Prohibited
• Fuse, safetyFuse, safety 1.4S UN0105 II Prohibited 1B
• Fusee (railway or highway)Fusee (railway or highway) 4.1 NA1325 II Prohibited Prohibited
• Fusel oilFusel oil 3 UN1201 II, III Prohibited 3A
• Fuses (except safety fuses Division 1.4S)All types of fuses (except safety fuses as permitted under 341.22 ) are prohibited from mailing.
• Fuzes, detonatingFuzes, detonating 1.1B UN0106 II Prohibited Prohibited
• Fuzes, detonating, with protective featuresFuzes, detonating, with protective features 1.1D UN0408 II Prohibited Prohibited
• Fuzes, ignitingFuzes, igniting 1.3G UN0316 II Prohibited Prohibited
• Galactsan trinitrateGalactsan trinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• GalliumGallium 8 UN2803 III Prohibited Prohibited
• Gas cartridges (flammable) without a release device, non-refillableGas cartridges (flammable) without a release device, non-refillable 2.1 UN2037 n/a Prohibited 2A
• Gas identification setGas identification set 2.3 NA9035 n/a Prohibited Prohibited
• Gas oil or Diesel fuel or Heating oil, lightGas oil or Diesel fuel or Heating oil, light 3 UN1202 III Prohibited 3A
• Gas, refrigerated liquid, flammable, n.o.s. (cryogenic liquid)Gas, refrigerated liquid, flammable, n.o.s. (cryogenic liquid) 2.1 UN3312 n/a Prohibited Prohibited
• Gas, refrigerated liquid, n.o.s. (cryogenic liquid)Gas, refrigerated liquid, n.o.s. (cryogenic liquid) 2.2 UN3158 n/a Prohibited Prohibited
• Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid)Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid) 2.2 UN3311 n/a Prohibited Prohibited
• Gas sample, non-pressurized, flammable, n.o.s., not refrigerated liquidGas sample, non-pressurized, flammable, n.o.s., not refrigerated liquid 2.1 UN3167 n/a Prohibited 2A
• Gas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquidGas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquid 2.3 UN3168 n/a Prohibited Prohibited
• Gas sample, non-pressurized, toxic, n.o.s., not refrigerated liquidGas sample, non-pressurized, toxic, n.o.s., not refrigerated liquid 2.3 UN3169 n/a Prohibited Prohibited
• Gases (Hazard Class 2) — international mailInternational Mail: All gases are prohibited.
• Gasohol gasoline mixed with ethyl alcohol, with not more than 10 percent alcoholGasohol gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol 3 NA1203 II Prohibited 3A
• Gasolinehese items in the U.S. mail: Air Bags Ammunition Explosives Gasoline Liquid Mercury Marijuana (medical or otherwise); hemp/CBD is allowed, but restricted Domestically Restricted It
• Gasoline includes gasoline mixed with ethyl alcohol, with not more than 10 percent alcoholGasoline includes gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol 3 UN1203 II Prohibited Prohibited
• Gasoline (UN1203)20° F (-7° C) or below are prohibited from mailing. Gasoline (UN1203) is a flammable liquid that normally has a flashpoint of -50° F. Gasoline is nonmailable under any circumstance
• GermaneGermane 2.3 UN2192 n/a Prohibited Prohibited
• GluesSome glues may only be sent by ground transportation.
• Glycerol-1,3-dinitrateGlycerol-1,3-dinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Glycerol alpha-monochlorohydrinGlycerol alpha-monochlorohydrin 6.1 UN2689 III 6A 6A
• Glycerol gluconate trinitrateGlycerol gluconate trinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Glycerol lactate trinitrateGlycerol lactate trinitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• Glycidaldehyde · USPSGlycidaldehyde 3 UN2622 II Prohibited 3A
• Grenades, hand or rifle, with bursting chargeGrenades, hand or rifle, with bursting charge 1.1D UN0284 II Prohibited Prohibited
• Grenades, practice, hand or rifleGrenades, practice, hand or rifle 1.3G UN0318 II Prohibited Prohibited
• Guanidine nitrate · USPSGuanidine nitrate 5.1 UN1467 III 5A 5A
• Guanyl nitrosaminoguanylidene hydrazine (dry)Guanyl nitrosaminoguanylidene hydrazine (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Guanyl nitrosaminoguanylidene hydrazine, wetted with not less than 30 percent water, by massGuanyl nitrosaminoguanylidene hydrazine, wetted with not less than 30 percent water, by mass 1.1A UN0113 II Prohibited Prohibited
• Guanyl nitrosaminoguanyltetrazene (dry)Guanyl nitrosaminoguanyltetrazene (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Guanyl nitrosaminoguanyltetrazene, wetted or Tetrazene, wetted with not less than 30 percentwater or mixture of alcohol and water, by mass · USPSGuanyl nitrosaminoguanyltetrazene, wetted or Tetrazene, wetted with not less than 30 percentwater or mixture of alcohol and water, by mass 1.1A UN0114 II Prohibited Prohibited
• Hafnium powder, dryHafnium powder, dry 4.2 UN2545 I, II, III Prohibited Prohibited
• Hafnium 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 · USPSHafnium 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 pr
• HairsprayEssential oils, nail polish (and nail polish remover), perfumes and colognes, hand sanitizer, inks, stains and varnishes, hairspray, and electronics with a lithium battery are amon
• Hairspray (aerosol)Hairspray | Flammable aerosol | UN1950
• Hand SanitizerIt is prohibited to send these materials by International Mail including APO/FPO/DPO (military) destinations.
• handguns - authorized military and law enforcementhandguns may be mailed by licensed firearm manufacturers, dealers, importers, or authorized agents of federal, state, territory, or district governments, only upon filing the requi
• handguns - between licensed FFL dealersHandguns may be mailed between licensed firearm manufacturers, dealers, and importers in customary trade shipments, or for repairing or replacing parts.
• handguns - general prohibitionHandguns, and other firearms capable of being concealed on the person, are nonmailable unless mailed between the parties listed in 432
• Hazardous Materials (HAZMAT)Some HAZMAT can only be sent by ground transportation—it can’t go on airplanes.
• Hazardous materials shipped undeclared via USPS commercial packagesAlso, a HazMat Noncompliance Fee of $50 will be applied to any competitive commercial product when Hazardous Materials are detected but the customer did not appropriately declare a
• Hazardous waste, liquid, n.o.s. · USPSHazardous waste, liquid, n.o.s. 9 NA3082 III Prohibited Prohibited
• Hazardous waste, solid, n.o.s.Hazardous waste, solid, n.o.s. 9 NA3077 III Prohibited Prohibited
• Heating oil, lightHeating oil, light 3 UN1202 III Prohibited 3A
• Helium, compressedHelium, compressed 2.2 UN1046 n/a 2B 2B
• Helium, refrigerated liquid (cyrogenic liquid)Helium, refrigerated liquid (cyrogenic liquid) 2.2 UN1963 n/a Prohibited Prohibited
• hemp and hemp-based products including CBDHemp and hemp-based products, including cannabidiol (CBD) with the tetrahydrocannabinol (THC) concentration of such hemp (or its derivatives) not exceeding a 0.3 percent limit are
• Hemp Products (including CBD)You cannot send hemp and hemp-derived products to international or military destinations.
• Heptafluoropropane or Refrigerant gas R 227Heptafluoropropane or Refrigerant gas R 227 2.2 UN3296 n/a 2B 2B
• HeptanesHeptanes 3 UN1206 II Prohibited 3A
• HexachloroacetoneHexachloroacetone 6.1 UN2661 III 6A 6A
• HexachlorobenzeneHexachlorobenzene 6.1 UN2729 III 6A 6A
• HexachlorobutadieneHexachlorobutadiene 6.1 UN2279 III 6A 6A
• HexachlorocyclopentadieneHexachlorocyclopentadiene 6.1 UN2646 I Prohibited Prohibited
• HexachloropheneHexachlorophene 6.1 UN2875 III 6A 6A
• HexadecyltrichlorosilaneHexadecyltrichlorosilane 8 UN1781 II Prohibited Prohibited
• HexadienesHexadienes 3 UN2458 II Prohibited Prohibited
• Hexaethyl tetraphosphate and compressed gas mixturesHexaethyl tetraphosphate and compressed gas mixtures 2.3 UN1612 n/a Prohibited Prohibited
• Hexaethyl tetraphosphate, liquidHexaethyl tetraphosphate, liquid 6.1 UN1611 II Prohibited Prohibited
• Hexaethyl tetraphosphate, solidHexaethyl tetraphosphate, solid 6.1 UN1611 II Prohibited Prohibited
• HexafluoroacetoneHexafluoroacetone 2.3 UN2420 n/a Prohibited Prohibited
• Hexafluoroacetone hydrate, liquidHexafluoroacetone hydrate, liquid 6.1 UN2552 II Prohibited Prohibited
• Hexafluoroacetone hydrate, solidHexafluoroacetone hydrate, solid 6.1 UN3436 II Prohibited Prohibited
• Hexafluoroethane, compressed or Refrigerant gas R 116Hexafluoroethane, compressed or Refrigerant gas R 116 2.2 UN2193 n/a 2B 2B
• Hexafluorophosphoric acidHexafluorophosphoric acid 8 UN1782 II Prohibited Prohibited
• Hexafluoropropylene, compressed or Refrigerant gas R 1216Hexafluoropropylene, compressed or Refrigerant gas R 1216 2.2 UN1858 n/a 2B 2B
• HexaldehydeHexaldehyde 3 UN1207 III Prohibited 3A
• Hexamethylene diisocyanateHexamethylene diisocyanate 6.1 UN2281 II Prohibited Prohibited
• Hexamethylene triperoxide diamine (dry)Hexamethylene triperoxide diamine (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Hexamethylenediamine, solidHexamethylenediamine, solid 8 UN2280 III 8A 8A
• HexamethyleneimineHexamethyleneimine 3 UN2493 II Prohibited Prohibited
• HexamethylenetetramineHexamethylenetetramine 4.1 UN1328 III Prohibited 4A
• Hexamethylol benzene hexanitrateHexamethylol benzene hexanitrate Forbidden Prohibited Prohibited Prohibited Prohibited
• HexanesHexanes 3 UN1208 II Prohibited 3A
• Hexanitroazoxy benzeneHexanitroazoxy benzene Forbidden Prohibited Prohibited Prohibited Prohibited
• Hexanitrodiphenyl ureaHexanitrodiphenyl urea Forbidden Prohibited Prohibited Prohibited Prohibited
• Hexanitrodiphenylamine or Dipicrylamine or HexylHexanitrodiphenylamine or Dipicrylamine or Hexyl 1.1D UN0079 II Prohibited Prohibited
• HexanitroethaneHexanitroethane Forbidden Prohibited Prohibited Prohibited Prohibited
• HexanitrooxanilideHexanitrooxanilide Forbidden Prohibited Prohibited Prohibited Prohibited
• HexanitrostilbeneHexanitrostilbene 1.1D UN0392 II Prohibited Prohibited
• HexanolsHexanols 3 UN2282 III Prohibited 3A
• Hexolite, or Hexotol dry or wetted with less than 15 percent water, by mass · USPSHexolite, or Hexotol dry or wetted with less than 15 percent water, by mass 1.1D UN0118 II Prohibited Prohibited
• HexotonalHexotonal 1.1D UN0393 II Prohibited Prohibited
• HexyltrichlorosilaneHexyltrichlorosilane 8 UN1784 II Prohibited Prohibited
• HMX mixtures, wetted or desensitized RDX and HMX mixtures, wetted with not less than 15 percent water by mass or RDX and HMX mixtures, desensitized with not less than 10 percent phlegmatizer by massHMX mixtures, wetted or desensitized RDX and HMX mixtures, wetted with not less than 15 percent water by mass or RDX and HMX mixtures, desensitized with not less than 10 percent ph
• honeybeesHoneybees: Acceptable to mail only via surface transportation (except for queen honeybees; refer to b.). Mailpieces must be plainly marked on the address side with "Live Bees" and
• Hydrazine, anhydrous or Hydrazine aqueous solutions with more than 64 percent hydrazine, by mass · USPSHydrazine, anhydrous or Hydrazine aqueous solutions with more than 64 percent hydrazine, by mass 8 UN2029 I Prohibited Prohibited
• Hydrazine aqueous solution, flammable with more than 37 percent hydrazine, by massHydrazine aqueous solution, flammable with more than 37 percent hydrazine, by mass 8 UN3484 I Prohibited Prohibited
• Hydrazine aqueous solution, with more than 37 percent hydrazine, by massHydrazine aqueous solution, with more than 37 percent hydrazine, by mass 8 UN2030 II Prohibited Prohibited
• Hydrazine, aqueous solution with not more than 37 percent hydrazine, by massHydrazine, aqueous solution with not more than 37 percent hydrazine, by mass 6.1 UN3293 III 6A 6A
• Hydrazine azideHydrazine azide Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydrazine chlorateHydrazine chlorate Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydrazine decarbonic acid diazideHydrazine decarbonic acid diazide Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydrazine perchlorateHydrazine perchlorate Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydrazine selenateHydrazine selenate Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydriodic acidHydriodic acid 8 UN1787 II, III 8A 8A
• Hydrobromic acid, with more than 49 percent hydrobromic acidHydrobromic acid, with more than 49 percent hydrobromic acid 8 UN1788 II, III Prohibited Prohibited
• Hydrobromic acid, with not more than 49 percent hydrobromic acidHydrobromic acid, with not more than 49 percent hydrobromic acid 8 UN1788 II, III 8A 8A
• Hydrocarbon gas mixture, compressed, n.o.s.Hydrocarbon gas mixture, compressed, n.o.s. 2.1 UN1964 n/a Prohibited 2A
• Hydrocarbon gas mixtures, liquified, n.o.s.Hydrocarbon gas mixtures, liquified, n.o.s. 2.1 UN1965 n/a Prohibited 2A
• Hydrocarbons, liquid, n.o.s.Hydrocarbons, liquid, n.o.s. 3 UN3295 I, II, III Prohibited 3A
• Hydrochloric acidHydrochloric acid 8 UN1789 II, III 8A 8A
• Hydrochloric acid (UN1789)Hydrochloric Acid (UN1789): Acceptable only in solutions not exceeding 10 percent acid that qualify as Limited Quantity air or Limited Quantity surface material.
• Hydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide · USPSHydrocyanic acid, aqueous solutions or Hydrogen cyanide, aqueous solutions with not more than 20 percent hydrogen cyanide 6.1 UN1613 I Prohibited Prohibited
• Hydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanideHydrocyanic acid, aqueous solutions with less than 5 percent hydrogen cyanide 6.1 NA1613 II Prohibited Prohibited
• Hydrocyanic acid (prussic) unstabilized · USPSHydrocyanic acid (prussic) unstabilized Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydrofluoric acid and Sulfuric acid mixturesHydrofluoric acid and Sulfuric acid mixtures 8 UN1786 I Prohibited Prohibited
• Hydrofluoric acid (UN1790)Hydrofluoric Acid (UN1790).
• Hydrofluoric acid, with more than 60 percent strengthHydrofluoric acid, with more than 60 percent strength 8 UN1790 I Prohibited Prohibited
• Hydrofluoric acid, with not more than 60 percent strengthHydrofluoric acid, with not more than 60 percent strength 8 UN1790 II Prohibited Prohibited
• Hydrogen and Methane mixtures, compressedHydrogen and Methane mixtures, compressed 2.1 UN2034 n/a Prohibited 2A
• Hydrogen bromide, anhydrousHydrogen bromide, anhydrous 2.3 UN1048 n/a Prohibited Prohibited
• Hydrogen chloride, anhydrousHydrogen chloride, anhydrous 2.3 UN1050 n/a Prohibited Prohibited
• Hydrogen chloride, refrigerated liquidHydrogen chloride, refrigerated liquid 2.3 UN2186 n/a Prohibited Prohibited
• Hydrogen, compressedHydrogen, compressed 2.1 UN1049 n/a Prohibited 2A
• Hydrogen, cyanide, solution in alcohol with not more than 45 percent hydrogen cyanideHydrogen, cyanide, solution in alcohol with not more than 45 percent hydrogen cyanide 6.1 UN3294 I Prohibited Prohibited
• Hydrogen cyanide, stabilized with less than 3 percent waterHydrogen cyanide, stabilized with less than 3 percent water 6.1 UN1051 I Prohibited Prohibited
• Hydrogen cyanide, stabilized with less than 3 percent water and absorbed in a porous inert materialHydrogen cyanide, stabilized with less than 3 percent water and absorbed in a porous inert material 6.1 UN1614 I Prohibited Prohibited
• Hydrogen fluoride, anhydrousHydrogen fluoride, anhydrous 8 UN1052 I Prohibited Prohibited
• 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 equipmentHydrogen 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
• Hydrogen iodide, anhydrousHydrogen iodide, anhydrous 2.3 UN2197 n/a Prohibited Prohibited
• Hydrogen peroxide and peroxyacetic acid mixtures, stabilized with acids, water, and not more than 5 percent peroxyacetic acidHydrogen peroxide and peroxyacetic acid mixtures, stabilized with acids, water, and not more than 5 percent peroxyacetic acid 5.1 UN3149 II Prohibited Prohibited
• Hydrogen peroxide, aqueous solutions with more than 40 percent but not more than 60 percent hydrogen peroxide (stabilized as necessary)Hydrogen peroxide, aqueous solutions with more than 40 percent but not more than 60 percent hydrogen peroxide (stabilized as necessary) 5.1 UN2014 II Prohibited Prohibited
• Hydrogen peroxide, aqueous solutions with not less than 8 percent but less than 20 percent hydrogen peroxide (stabilized as necessary)Hydrogen peroxide, aqueous solutions with not less than 8 percent but less than 20 percent hydrogen peroxide (stabilized as necessary) 5.1 UN2984 III 5A 5A
• Hydrogen peroxide, aqueous solutions with not less than 20 percent but not more than 40 percent hydrogen peroxide (stabilized as necessary)Hydrogen peroxide, aqueous solutions with not less than 20 percent but not more than 40 percent hydrogen peroxide (stabilized as necessary) 5.1 UN2014 II Prohibited Prohibited
• Hydrogen peroxide solution (8% or less)Hydrogen Peroxide . Division 5.1 hydrogen peroxide solutions with an 8 percent or less hydrogen peroxide content is regulated as hazardous material but must be prepared according t
• Hydrogen peroxide solution (more than 8% but no more than 20%)Solutions of hydrogen peroxide more than 8 percent but no more than 20 percent are permitted if they can qualify as Limited Quantity air or Limited Quantity surface.
• Hydrogen peroxide solution (more than 20%)Hydrogen peroxide solution (more than 20 percent).
• Hydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized with more than 60 percent hydrogen peroxideHydrogen peroxide, stabilized or Hydrogen peroxide aqueous solutions, stabilized with more than 60 percent hydrogen peroxide 5.1 UN2015 I Prohibited Prohibited
• Hydrogen, refrigerated liquid (cryogenic liquid)Hydrogen, refrigerated liquid (cryogenic liquid) 2.1 UN1966 n/a Prohibited Prohibited
• Hydrogen selenide, anhydrousHydrogen selenide, anhydrous 2.3 UN2202 n/a Prohibited Prohibited
• Hydrogen sulfide · USPSHydrogen sulfide 2.3 UN1053 n/a Prohibited Prohibited
• Hydroxyl amine iodideHydroxyl amine iodide Forbidden Prohibited Prohibited Prohibited Prohibited
• Hydroxylamine sulfateHydroxylamine sulfate 8 UN2865 III 8A 8A
• Hypochlorite solutionsHypochlorite solutions 8 UN1791 II, III 8A 8A
• Hypochlorites, inorganic, n.o.s.Hypochlorites, inorganic, n.o.s. 5.1 UN3212 II 5A 5A
• Hyponitrous acidHyponitrous acid Forbidden Prohibited Prohibited Prohibited Prohibited
• IgnitersIgniters 1.1G UN0121 II Prohibited Prohibited
• Infectious substances, affecting animals onlyInfectious substances, affecting animals only 6.2 UN2900 n/a Prohibited Prohibited
• Infectious substances, affecting humans onlyInfectious substances, affecting humans only 6.2 UN2814 n/a Prohibited Prohibited
• Initiating explosives (dry)Initiating explosives (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Inks (flammable or combustible liquid)Inks: Classified as flammable or combustible liquids. Defined as colored liquids used for writing, drawing, and printing, and often composed of pigments such as carbon black suspen
• Inks, stains and varnishesEssential oils, nail polish (and nail polish remover), perfumes and colognes, hand sanitizer, inks, stains and varnishes, hairspray, and electronics with a lithium battery are amon
• Inosital hexanitrate (dry)Inosital hexanitrate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Insecticide gases, flammable, n.o.sInsecticide gases, flammable, n.o.s 2.1 UN3354 n/a Prohibited 2A
• Insecticide gases, n.o.s.Insecticide gases, n.o.s. 2.2 UN1968 n/a 2B 2B
• Insecticide gases, toxic, flammable, n.o.s., Inhalation hazard A, B, C or DInsecticide gases, toxic, flammable, n.o.s., Inhalation hazard A, B, C or D 2.3 UN3355 n/a Prohibited Prohibited
• Insecticide gases, toxic, n.o.s.Insecticide gases, toxic, n.o.s. 2.3 UN1967 n/a Prohibited Prohibited
• intoxicating liquorsbeverages with an alcohol content of 0.5 percent or more by weight and are taxable per Chapter 51 of the United States (U.S.) Internal Revenue Service (IRS) Code
• intoxicating liquors - denatured flammable or combustibleif denaturing agents are used, such as sodium bisulfate (a corrosive) or mercuric chloride (a poison), the substances must meet the mailability requirements for Class 8 corrosive m
• intoxicating liquors - exempt federal/state agency mailingsIntoxicating liquor is exempt from the prohibition and may be mailed between federal or state agency employees for official use (e.g., for testing purposes).
• intoxicating liquors - products not categorized as taxable alcoholic beveragesExamples of these mailable products include cold remedies, cooking wine, and mouthwash.
• Inulin trinitrate (dry)Inulin trinitrate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• IodineIodine 8 UN3495 III Prohibited Prohibited
• Iodine azide (dry)Iodine azide (dry) Forbidden Prohibited Prohibited Prohibited Prohibited
• Iodine monochloride, liquidIodine monochloride, liquid 8 UN3498 II Prohibited Prohibited
• Iodine monochloride, solidIodine monochloride, solid 8 UN1792 II Prohibited Prohibited
• Iodine pentafluorideIodine pentafluoride 5.1 UN2495 I Prohibited Prohibited

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