PHMSA - Library - Forbidden Materials

Careers | Contact Us | FAQs | Site Map

For the Public

Hazmat Safety Community

Pipeline Safety Community

Media | Congress

Doing Business with PHMSA

Forbidden Materials

Sep 25, 2000

49 CFR 172.101 Hazardous Materials Table (Column 3)

Acetyl acetone peroxide with more than 9 percent by mass active oxygen

Acetyl benzoyl peroxide, solid, or with more than 40 percent in solution

Acetyl cyclohexanesulfonyl peroxide, with more than 82 percent wetted with less than 12 percent water

Acetyl peroxide, solid, or with more than 25 percent in solution

Acetylene (liquefied)

Acetylene silver nitrate

Aluminum dross, wet or hot

Ammonium azide

Ammonium bromate

Ammonium chlorate

Ammonium fulminate

Ammonium nitrite

Ammonium permanganate

Antimony sulfide and a chlorate, mixtures of

Arsenic sulfide and a chlorate, mixtures of

Ascaridole (organic peroxide)

Azaurolic acid (salt of) (dry)

Azido guanidine picrate (dry)

Azido hydroxy tetrazole (mercury and silver salts)

5-Azido-1-hydroxy tetrazole

3-Azido-1,2-Propylene glycol dinitrate

Azidodithiocarbonic acid

Azidoethyl nitrate

Azotetrazole (dry)

Benzene diazonium chloride (dry)

Benzene diazonium nitrate (dry)

Benzene triozonide

Benzoxidiazoles (dry)

Benzoyl azide

Biphenyl triozonide

Bromine azide

4-Bromo-1,2-dinitrobenzene

4-Bromo-1,2-dinitrobenzene (unstable at 59 degrees C.)

1-Bromo-3-nitrobenzene (unstable at 56 degrees C)

Bromosilane

1,2,4-Butanetriol trinitrate

tert-Butoxycarbonyl azide

tert-Butyl hydroperoxide, with more than 90 percent with water

tert-Butyl peroxyacetate, with more than 76 percent in solution

n-Butyl peroxydicarbonate, with more than 52 percent in solution

tert-Butyl peroxyisobutyrate, with more than 77 percent in solution

Chlorine azide

Chlorine dioxide (not hydrate)

Chloroacetone (unstabilized)

Chloroprene, uninhibited

Coal briquettes, hot

Coke, hot

Copper acetylide

Copper amine azide

Copper tetramine nitrate

Cyanuric triazide

Cyclotetramethylene tetranitramine (dry or unphlegmatized) (HMX)

Di-(1-hydroxytetrazole) (dry)

Di-(1-naphthoyl) peroxide

2,2-Di-(4,4-di-tert-butylperoxycyclohexyl) propane, with more than 42 percent with inert solid

Di-(beta-nitroxyethyl) ammonium nitrate

a,a'-Di-(nitroxy) methylether

2,2-Di-(tert-butylperoxy) butane, with more than 55 percent in solution

Di-(tert-butylperoxy) phthalate, with more than 55 percent in solution

Di-2,4-dichlorobenzoyl peroxide, with more than 75 percent with water

Di-n-butyl peroxydicarbonate, with more than 52 percent in solution

Diacetone alcohol peroxides, with more than 57 percent in solution with more than 9 percent hydrogen peroxide, less than 26 percent diacetone alcohol and less than 9 percent water; total active oxygen content more than 9 percent by mass

Diacetyl peroxide, solid, or with more than 25 percent in solution

p-Diazidobenzene

1,2-Diazidoethane

1,1'-Diazoaminonaphthalene

Diazoaminotetrazole (dry)

Diazodinitrophenol (dry)

Diazodiphenylmethane

Diazonium nitrates (dry)

Diazonium perchlorates (dry)

1,3-Diazopropane

Dibenzyl peroxydicarbonate, with more than 87 percent with water

Dibromoacetylene

N,N'-Dichlorazodicarbonamidine (salts of) (dry)

Dichloroacetylene

Dichloroethyl sulfide

Dichlorovinylchloroarsine

Diethanol nitrosamine dinitrate (dry)

Diethyl peroxydicarbonate, with more than 27 percent in solution

Diethylene glycol dinitrate

Diethylgold bromide

1,8-Dihydroxy-2,4,5,7-tetranitroanthraquinone (chrysamminic acid)

Diiodoacetylene

Diisopropylbenzene hydroperoxide, with more than 72 percent in solution

2,5-Dimethyl-2,5-dihydroperoxy hexane, with more than 82 percent with water

Dimethylhexane dihydroperoxide (dry)

1,4-Dinitro-1,1,4,4-tetramethylolbutanetetranitrate (dry)

2,4-Dinitro-1,3,5-trimethylbenzene

1,3-Dinitro-4,5-dinitrosobenzene

1,3-Dinitro-5,5-dimethyl hydantoin

Dinitro-7,8-dimethylglycoluril (dry)

1,2-Dinitroethane

1,1-Dinitroethane (dry)

Dinitromethane

Dinitropropylene glycol

2,4-Dinitroresorcinol (heavy metal salts of) (dry)

4,6-Dinitroresorcinol (heavy metal salts of) (dry)

3,5-Dinitrosalicylic acid (lead salt) (dry)

Dinitrosobenzylamidine and salts of (dry)

2,2-Dinitrostilbene

1,9-Dinitroxy pentamethylene-2,4, 6,8-tetramine (dry)

Dipropionyl peroxide, with more than 28 percent in solution

Ethanol amine dinitrate

Ethyl hydroperoxide

Ethyl perchlorate

Ethylene diamine diperchlorate

Ethylene glycol dinitrate

Explosive, forbidden. See Sec. 173.54

Forbidden materials. See 173.21

Fulminate of mercury (dry)

Fulminating gold

Fulminating mercury

Fulminating platinum

Fulminating silver

Fulminic acid

Galactsan trinitrate

Glycerol gluconate trinitrate

Glycerol lactate trinitrate

Glycerol-1,3-dinitrate

Guanyl nitrosaminoguanylidene hydrazine (dry)

Guanyl nitrosaminoguanyltetrazene (dry)

Hexamethylene triperoxide diamine (dry)

Hexamethylol benzene hexanitrate

2,2',4,4',6,6'-Hexanitro-3,3'-dihydroxyazobenzene (dry)

Hexanitroazoxy benzene

N,N'-(hexanitrodiphenyl) ethylene dinitramine (dry)

Hexanitrodiphenyl urea

2,2',3',4,4',6-Hexanitrodiphenylamine

2,3',4,4',6,6'-Hexanitrodiphenylether

Hexanitroethane

Hexanitrooxanilide

Hydrazine azide

Hydrazine chlorate

Hydrazine dicarbonic acid diazide

Hydrazine perchlorate

Hydrazine selenate

Hydrocyanic acid (prussic), unstabilized

Hydroxyl amine iodide

Hyponitrous acid

Initiating explosives (dry)

Inositol hexanitrate (dry)

Inulin trinitrate (dry)

Iodine azide (dry)

Iodoxy compounds (dry)

Iridium nitratopentamine iridium nitrate

Isopropylcumyl hydroperoxide, with more than 72 percent in solution

Isothiocyanic acid

Lead azide (dry)

Lead nitroresorcinate (dry)

Lead picrate (dry)

Lead styphnate (dry)

m-Nitrobenzene diazonium perchlorate

m-Nitrophenyldinitro methane

m-Phenylene diaminediperchlorate (dry)

Magnesium dross, wet or hot

Mannitan tetranitrate

Mannitol hexanitrate (dry)

Mercurous azide

Mercury acetylide

Mercury iodide aquabasic ammonobasic (Iodide of Millon's base)

Mercury nitride

Mercury oxycyanide

Metal salts of methyl nitramine (dry)

Methazoic acid

Methyl ethyl ketone peroxide, in solution with more than 9 percent by mass active oxygen

Methyl isobutyl ketone peroxide, in solution with more than 9 percent by mass active oxygen

Methyl nitramine (dry)

Methyl nitrate

Methyl nitrite

Methyl picric acid (heavy metal salts of)

Methyl trimethylol methane trinitrate

Methylamine dinitramine and dry salts thereof

Methylamine nitroform

Methylamine perchlorate (dry)

Methylene glycol dinitrate

a-Methylglucoside tetranitrate

a-Methylglycerol trinitrate

2-Nitro-2-methylpropanol nitrate

Monochloroacetone (unstabilized)

Naphthalene diozonide

Naphthylamineperchlorate

Nickel picrate

Nitrated paper (unstable)

Nitrates of diazonium compounds

Nitro isobutane triol trinitrate

6-Nitro-4-diazotoluene-3-sulfonic acid (dry)

N-Nitro-N-methylglycolamide nitrate

N-Nitroaniline

Nitroethyl nitrate

Nitroethylene polymer

Nitrogen trichloride

Nitrogen triiodide

Nitrogen triiodide monoamine

Nitroglycerin, liquid, not desensitized

Nitroguanidine nitrate

1-Nitrohydantoin

Nitromannite (dry)

Nitrosugars (dry)

1,7-Octadine-3,5-diyne-1,8-dimethoxy-9-octadecynoic acid

Organic peroxide type A, liquid or solid

Pentaerythrite tetranitrate (dry)

Pentanitroaniline (dry)

Perchloric acid, with more than 72 percent acid by mass

Peroxyacetic acid, with more than 43 percent and with more than 6 percent hydrogen peroxide

Phosphorus (white or red) and a chlorate, mixtures of

Potassium carbonyl

Pyridine perchlorate

Quebrachitol pentanitrate

Selenium nitride

Silver acetylide (dry)

Silver azide (dry)

Silver chlorite (dry)

Silver fulminate (dry)

Silver oxalate (dry)

Silver picrate (dry)

Sodium picryl peroxide

Sodium tetranitride

Sucrose octanitrate (dry)

Sulfur and chlorate, loose mixtures of

Tetraazido benzene quinone

Tetraethylammonium perchlorate (dry)

Tetramethylene diperoxide dicarbamide

Tetranitro diglycerin

2,3,4,6-Tetranitrophenol

2,3,4,6-Tetranitrophenyl methyl nitramine

2,3,4,6-Tetranitrophenylnitramine

Tetranitroresorcinol (dry)

2,3,5,6-Tetranitroso nitrobenzene (dry)

2,3,5,6-Tetranitroso-1,4-dinitrobenzene

Tetrazine (dry)

Tetrazolyl azide (dry)

Tri-(b-nitroxyethyl) ammonium nitrate

Trichloromethyl perchlorate

Triformoxime trinitrate

1,3,5-Trimethyl-2,4,6-trinitrobenzene

Trimethylene glycol diperchlorate

Trimethylol nitromethane trinitrate

2,4,6-Trinitro-1,3-diazobenzene

2,4,6-Trinitro-1,3,5-triazido benzene (dry)

Trinitroacetic acid

Trinitroacetonitrile

Trinitroamine cobalt

Trinitroethanol

Trinitroethylnitrate

Trinitromethane

1,3,5-Trinitronaphthalene

2,4,6-Trinitrophenyl guanidine (dry)

2,4,6-Trinitrophenyl nitramine

2,4,6-Trinitrophenyl trimethylol methyl nitramine trinitrate (dry)

2,4,6-Trinitroso-3-methyl nitraminoanisole

Trinitrotetramine cobalt nitrate

Tris, bis-bifluoroamino diethoxy propane (TVOPA)

Vinyl nitrate polymer

p-Xylyl diazide

49 CFR 173.21 Forbidden Materials and Packages

Unless otherwise provided in this subchapter, the offering for transportation or transportation of the following is forbidden:

Materials that are designated "Forbidden" in Column 3 of the §172.101 Table.
Forbidden explosives as defined in §173.54 of this part.
Electrical devices which are likely to create sparks or generate a dangerous quantity of heat,
unless packaged in a manner which precludes such an occurrence.
For carriage by aircraft, any package which has a magnetic field of more than 0.00525 gauss
measured at 4.5 m (15 feet) from any surface of the package.
A material in the same packaging, freight container, or overpack with another material, the
mixing of which is likely to cause a dangerous evolution of heat, or flammable or poisonous
gases or vapors, or to produce corrosive materials.
A package containing a material which is likely to decompose with a self-accelerated
decomposition temperature (SADT) of 50°C (122°F) or less, or polymerize at a temperature of
54°C (130°F) or less with an evolution of a dangerous quantity of heat or gas when decomposing
or polymerizing, unless the material is stabilized or inhibited in a manner to preclude such
evolution. The SADT may be determined by any of the test methods described in Part II of the
UN Manual of Tests and Criteria.
1. A package meeting the criteria of paragraph (f) of this section may be required to be shipped under controlled temperature conditions. The control temperature and emergency temperature for a package shall be as specified in the table in this paragraph based upon the SADT of the material. The control temperature is the temperature above which a package of the material may not be offered for transportation or transported. The emergency temperature is the temperature at which, due to imminent danger, emergency measures must be initiated. Section 173.21 Table: Method of Determining Control and Emergency Temperature. [See 49 CFR for Table]
2. For self-reactive materials listed in §173.224(b) Table control and emergency temperatures, where required are shown in Columns 5 and 6, respectively. For organic peroxides listed in The Organic Peroxides Table in §173.225 control and emergency temperatures, where required, are shown in Columns 7a and 7b, respectively.
3. Refrigeration may be used as a means of stabilization only when approved by the Associate Administrator for Hazardous Materials Safety. For status of approvals previously issued by the Bureau of Explosives, see §171.19 of this subchapter. Methods of stabilization approved by the Associate Administrator for Hazardous Materials Safety are as follows:
  1. For highway transportation:
    1. A material meeting the criteria of this paragraph (f) may be transported only in a transport vehicle, freight container, or motor vehicle equipped with a mechanical refrigeration unit, or loaded with a consumable refrigerant, capable of maintaining the inside temperature of the hazardous material at or below the control temperature required for the material during transportation.
    2. Each package containing a material meeting the criteria of this paragraph (f) must be loaded and maintained at or below the control temperature required for the material. The temperature of the material must be determined by appropriate means and entered on a written record at the time the packaging is loaded.
    3. The vehicle operator shall monitor the inside temperature of the transport vehicle, freight container, or motor vehicle and enter that temperature on a written record at the time the package is loaded and thereafter at intervals not exceeding two hours. Alternatively, a transport vehicle, freight container, or motor vehicle may be equipped with a visible or audible warning device that activates when the inside temperature of the transport vehicle, freight container, or motor vehicle exceeds the control temperature required for the material. The warning device must be readily visible or audible, as appropriate, from the vehicle operator's seat in the vehicle.
    4. The carrier shall advise the vehicle operator of the emergency temperature for the material, and provide the vehicle operator with written procedures that must be followed to assure maintenance of the control temperature inside the transport vehicle, freight container, or motor vehicle. The written procedures must include instructions for the vehicle operator on actions to take if the inside temperature exceeds the control temperature and approaches or reaches the emergency temperature for the material. In addition, the written temperature-control procedures must identify enroute points where the consumable refrigerant may be procured, or where repairs to, or replacement of, the mechanical refrigeration unit may be accomplished.
    5. The vehicle operator shall maintain the written temperature-control procedures, and the written record of temperature measurements specified in paragraph (f)(3)(i)(C) of this section, if applicable, in the same manner as specified in §177.817 of this subchapter for shipping papers.
    6. If the control temperature is maintained by use of a consumable refrigerant (e.g., dry ice or liquid nitrogen), the quantity of consumable refrigerant must be sufficient to maintain the control temperature for twice the average transit time under normal conditions of transportation.
    7. A material that has a control temperature of 40 °C (104 °F) or higher may be transported by common carrier. A material that has a control temperature below 40 °C (104 °F) must be transported by a private or contract carrier.
  2. For transportation by vessel, shipments are authorized in accordance with the control-temperature requirements of Section 21 of the General Introduction of the International Maritime Dangerous Goods Code (IMDG Code).
Packages which give off a flammable gas or vapor, released from a material not otherwise subject to this subchapter, likely to create a flammable mixture with air in a transport vehicle.
Packages containing materials (other than those classed as explosive) which will detonate in a fire.
1. For purposes of this paragraph, "detonate" means an explosion in which the shock wave travels through the material at a speed greater than the speed of sound.
2. (2) When tests are required to evaluate the performance of a package under the provisions of this paragraph, the testing must be done or approved by one of the agencies specified in §173.56.
A package containing a cigarette lighter, or other similar device, equipped with an ignition element and containing fuel; except that a cigarette lighter or similar device subject to this paragraph may be shipped if the design of the device and its inner packaging has been examined by the Bureau of Explosives and specifically approved by the Associate Administrator for Hazardous Materials Safety. The examination of cigarette lighters and similar devices containing gaseous fuel will include scrutiny for compliance with §173.308 of this part. For the status of approvals previously issued by the Bureau of Explosives, see §171.19 of this subchapter.
An organic peroxide of the "ketone peroxide" category which contains more than 9 percent available oxygen as calculated using the equation in §173.128(a)(4)(ii). The category, ketone peroxide, includes, but is not limited to:

Acetyl acetone peroxide
Cyclohexanone peroxide(s)
Diacetone alcohol peroxides
Methylcyclohexanone peroxide(s)
Methyl ethyl ketone peroxide(s)
Methyl isobutyl ketone peroxide(s)
Notwithstanding any other provision of this subchapter, including §§171.11 and 175.10(a)(2) of this subchapter, an oxygen generator (chemical) as cargo on a passenger-carrying aircraft until January 1, 1997. This prohibition does not apply to an oxygen generator for medical or personal use of a passenger that meets the requirements of §175.10(a)(7) or §175.10(a)(24) of this subchapter.