CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 105–199) > SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS (Parts 171–181) > PART 173—SHIPPERS—GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS > SUBPART E—Non-bulk Packaging for Hazardous Materials Other Than Class 1 and Class 7 (§173.158 to §173.230) > 173.225—Packaging requirements and other provisions for organic peroxides.

173.225—Packaging requirements and other provisions for organic peroxides.

(a) General. When the § 172.101 table specifies that an organic peroxide must be packaged under this section, the organic peroxide must be packaged and offered for transportation in accordance with the provisions of this section. Each packaging must conform to the general requirements of subpart B of part 173 and to the applicable requirements of part 178 of this subchapter. Non-bulk packagings must meet Packing Group II performance levels. To avoid unnecessary confinement, metallic non-bulk packagings meeting Packing Group I are not authorized. No used material, other than production residues or regrind from the same production process, may be used in plastic packagings. Organic peroxides that require temperature control are subject to the provisions of § 173.21(f). When an IBC or bulk packaging is authorized and meets the requirements of paragraph (f) or (h) of this section, respectively, lower control temperatures than those specified for non-bulk packaging may be required. An organic peroxide not identified in paragraph (c), (e), or (g) of this section by technical name, or not assigned to a generic type in accordance with the provisions in paragraph (b)(3) of this section, must conform to the provisions of paragraph (c) of § 173.128.
(b) New organic peroxides, formulations and samples. (1) Except as provided for samples in paragraph (b)(2) of this section, no person may offer for transportation an organic peroxide that is not identified by technical name in the Organic Peroxides Table, Organic Peroxide IBC Table, or the Organic Peroxide Portable Tank Table of this section, or a formulation of one or more organic peroxides that are identified by technical name in one of those tables, unless the organic peroxide is assigned a generic type and shipping description and is approved by the Associate Administrator under the provisions of § 173.128(d) of this subchapter.
(2) Samples. Samples of new organic peroxides or new formulations of organic peroxides identified in the Organic Peroxides Table in paragraph (c) of this section, for which complete test data are not available, and that are to be transported for further testing or product evaluation, may be assigned an appropriate shipping description for organic peroxide Type C, packaged and offered for transportation, under the following conditions:
(i) Data available to the person offering the material for transportation must indicate that the sample would pose a level of hazard no greater than that of an organic peroxide Type B and that the control temperature, if any, is sufficiently low to prevent any dangerous decomposition and sufficiently high to prevent any dangerous phase separation;
(ii) The sample must be packaged in accordance with packing method OP2, for a liquid or solid, respectively;
(iii) Packages of the organic peroxide may be offered for transportation and transported in a quantity not to exceed 10 kg (22 pounds) per transport vehicle; and
(iv) One of the following shipping descriptions must be assigned:
(A) Organic peroxide Type C, liquid, 5.2, UN 3103;
(B) Organic peroxide Type C, solid, 5.2, UN 3104;
(C) Organic peroxide Type C, liquid, temperature controlled, 5.2, UN 3113; or
(D) Organic peroxide Type C, solid, temperature controlled, 5.2, UN 3114.
(3) Mixtures. Mixtures of organic peroxides individually identified in the Organic Peroxides Table in paragraph (c) of this section may be classified as the same type of organic peroxide as that of the most dangerous component and be transported under the conditions for transportation given for this type. If the stable components form a thermally less stable mixture, the SADT of the mixture must be determined and the new control and emergency temperature derived under the provisions of § 173.21(f).
(c) Organic peroxides table. The following Organic Peroxides Table specifies by technical name those organic peroxides that are authorized for transportation and not subject to the approval provisions of § 173.128 of this part. An organic peroxide identified by technical name in the following table is authorized for transportation only if it conforms to all applicable provisions of the table. The column headings of the Organic Peroxides Table are as follows:
(1) Technical name. The first column specifies the technical name.
(2) ID number. The second column specifies the identification (ID) number which is used to identify the proper shipping name in the § 172.101 table. The word “EXEMPT” appearing in the column denotes that the material is not regulated as an organic peroxide.
(3) Concentration of organic peroxide. The third column specifies concentration (mass percent) limitations, if any, in mixtures or solutions for the organic peroxide. Limitations are given as minimums, maximums, or a range, as appropriate. A range includes the lower and upper limits (i.e., “53-100” means from, and including, 53% to, and including 100%). See introductory paragraph of § 172.203(k) of this subchapter for additional description requirements for an organic peroxide that may qualify for more than one generic listing, depending on its concentration.
(4) Concentration of diluents. The fourth column specifies the type and concentration (mass percent) of diluent or inert solid, when required. Other types and concentrations of diluents may be used if approved by the Associate Administrator.
(i) The required mass percent of “Diluent type A” is specified in column 4a. A diluent type A is an organic liquid that does not detrimentally affect the thermal stability or increase the hazard of the organic peroxide and with a boiling point not less than 150 °C at atmospheric pressure. Type A diluents may be used for desensitizing all organic peroxides.
(ii) The required mass percent of “Diluent type B” is specified in column 4b. A diluent type B is an organic liquid which is compatible with the organic peroxide and which has a boiling point, at atmospheric pressure, of less than 150 °C (302 °F) but at least 60 °C (140 °F), and a flash point greater than 5 °C (41 °F). Type B diluents may be used for desensitizing all organic peroxides, when specified in the organic peroxide tables, provided that the boiling point is at least 60 °C (140 °F) above the SADT of the peroxide in a 50 kg (110 lbs) package. A type A diluent may be used to replace a type B diluent in equal concentration.
(iii) The required mass percent of “Inert solid” is specified in column 4c. An inert solid is a solid that does not detrimentally affect the thermal stability or hazard of the organic peroxide.
(5) Concentration of water. Column 5 specifies, in mass percent, the minimum amount of water, if any, which must be in formulation.
(6) Packing method. Column 6 specifies the highest packing method (largest packaging capacity) authorized for the organic peroxide. Lower numbered packing methods (smaller packaging capacities) are also authorized. For example, if OP3 is specified, then OP2 and OP1 are also authorized. The Table of Packing Methods in paragraph (d) of this section defines the non-bulk packing methods.
(7) Temperatures. Column 7a specifies the control temperature. Column 7b specifies the emergency temperature. Temperatures are specified only when temperature controls are required. (See § 173.21(f) ).
(8) Notes. Column 8 specifies other applicable provisions, as set forth in notes following the table.
Organic Peroxide Table




Technical name ID number Concentration (mass %) Diluent (mass %) Water (mass %) Packing method Temperature ( °C) Notes
A B I Control Emergency
(1) (2) (3) (4a) (4b) (4c) (5) (6) (7a) (7b) (8)
Acetyl acetone peroxide UN3105 ≤42 ≥48 ≥8 OP7 2
Acetyl acetone peroxide [as a paste] UN3106 ≤32 OP7 21
Acetyl cyclohexanesulfonyl peroxide UN3112 ≤82 ≥12 OP4 −10 0
Acetyl cyclohexanesulfonyl peroxide UN3115 ≤32 ≥68 OP7 −10 0
tert-Amyl hydroperoxide UN3107 ≤88 ≥6 ≥6 OP8
tert-Amyl peroxyacetate UN3105 ≤62 ≥38 OP7
tert-Amyl peroxybenzoate UN3103 ≤100 OP5
tert-Amyl peroxy-2-ethylhexanoate UN3115 ≤100 OP7 20 25
tert-Amyl peroxy-2-ethylhexyl carbonate UN3105 ≤100 OP7
tert-Amyl peroxy isopropyl carbonate UN3103 ≤77 ≥23 OP5
tert-Amyl peroxyneodecanoate UN3115 ≤77 ≥23 OP7 0 10
tert-Amyl peroxyneodecanoate 3119 ≤47 ≥53 OP8 0 10
tert-Amyl peroxypivalate UN3113 ≤77 ≥23 OP5 10 15
tert-Amyl peroxypivalate 3119 ≤32 ≥68 OP8 10 15
tert-Amyl peroxy-3,5,5-trimethylhexanoate 3105 ≤100 OP7
tert-Butyl cumyl peroxide UN3107 >42-100 OP8 9
tert-Butyl cumyl peroxide UN3108 ≤52 ≥48 OP8 9
n-Butyl-4,4-di-(tert-butylperoxy)valerate UN3103 >52-100 OP5
n-Butyl-4,4-di-(tert-butylperoxy)valerate UN3108 ≤52 ≥48 OP8
tert-Butyl hydroperoxide UN3103 >79-90 ≥10 OP5 13
tert-Butyl hydroperoxide UN3105 ≤80 ≥20 OP7 4, 13
tert-Butyl hydroperoxide UN3107 ≤79 >14 OP8 13, 16
tert-Butyl hydroperoxide UN3109 ≤72 ≥28 OP8 13
tert-Butyl hydroperoxide [and] Di-tert-butylperoxide UN3103 <82 >9 ≥7 OP5 13
tert-Butyl monoperoxymaleate UN3102 >52-100 OP5
tert-Butyl monoperoxymaleate UN3103 ≤52 ≥48 OP6
tert-Butyl monoperoxymaleate UN3108 ≤52 ≥48 OP8
tert-Butyl monoperoxymaleate [as a paste] UN3108 ≤52 OP8
tert-Butyl peroxyacetate UN3101 >52-77 ≥23 OP5
tert-Butyl peroxyacetate UN3103 >32-52 ≥48 OP6
tert-Butyl peroxyacetate UN3109 ≤32 ≥68 OP8
tert-Butyl peroxybenzoate UN3103 >77-100 OP5
tert-Butyl peroxybenzoate UN3105 >52-77 ≥23 OP7 1
tert-Butyl peroxybenzoate UN3106 ≤52 ≥48 OP7
tert-Butyl peroxybenzoate 3109 ≤32 ≥68 OP8
tert-Butyl peroxybutyl fumarate UN3105 ≤52 ≥48 OP7
tert-Butyl peroxycrotonate UN3105 ≤77 ≥23 OP7
tert-Butyl peroxydiethylacetate UN3113 ≤100 OP5 20 25
tert-Butyl peroxy-2-ethylhexanoate UN3113 >52-100 OP6 20 25
tert-Butyl peroxy-2-ethylhexanoate UN3117 >32-52 ≥48 OP8 30 35
tert-Butyl peroxy-2-ethylhexanoate UN3118 ≤52 ≥48 OP8 20 25
tert-Butyl peroxy-2-ethylhexanoate UN3119 ≤32 ≥68 OP8 40 45
Code of Federal Regulations 558
tert-Butyl peroxy-2-ethylhexanoate [and] 2,2-di-(tert-Butylperoxy)butane UN3106 ≤12 ≤14 ≥14 ≥60 OP7
tert-Butyl peroxy-2-ethylhexanoate [and] 2,2-di-(tert-Butylperoxy)butane UN3115 ≤31 ≤36 ≥33 OP7 35 40
tert-Butyl peroxy-2-ethylhexylcarbonate UN3105 ≤100 OP7
tert-Butyl peroxyisobutyrate UN3111 >52-77 ≥23 OP5 15 20
tert-Butyl peroxyisobutyrate UN3115 ≤52 ≥48 OP7 15 20
tert-Butylperoxy isopropylcarbonate UN3103 ≤77 ≥23 OP5
1-(2-tert-Butylperoxy isopropyl)-3-isopropenylbenzene UN3105 ≤77 ≥23 OP7
1-(2-tert-Butylperoxy isopropyl)-3-isopropenylbenzene UN3108 ≤42 ≥58 OP8
tert-Butyl peroxy-2-methylbenzoate UN3103 ≤100 OP5
tert-Butyl peroxyneodecanoate UN3115 >77-100 OP7 −5 5
tert-Butyl peroxyneodecanoate UN3115 ≤77 ≥23 OP7 0 10
tert-Butyl peroxyneodecanoate [as a stable dispersion in water] UN3119 ≤52 OP8 0 10
tert-Butyl peroxyneodecanoate [as a stable dispersion in water (frozen)] UN3118 ≤42 OP8 0 10
tert-Butyl peroxyneodecanoate UN3119 ≤32 ≥68 OP8 0 10
tert-Butyl peroxyneoheptanoate UN3115 ≤77 ≥23 OP7 0 10
tert-Butyl peroxyneoheptanoate [as a stable dispersion in water] UN3117 ≤42 OP8 0 10
tert-Butyl peroxypivalate UN3113 >67-77 ≥23 OP5 0 10
tert-Butyl peroxypivalate UN3115 >27-67 ≥33 OP7 0 10
tert-Butyl peroxypivalate UN3119 ≤27 ≥73 OP8 30 35
tert-Butylperoxy stearylcarbonate UN3106 ≤100 OP7
tert-Butyl peroxy-3,5,5-trimethylhexanoate UN3105 >32-100 OP7
tert-Butyl peroxy-3,5,5-trimethlyhexanoate 3106 ≤42 ≥58 OP7
tert-Butyl peroxy-3,5,5-trimethylhexanoate UN3109 ≤32 ≥68 OP8
3-Chloroperoxybenzoic acid UN3102 >57-86 ≥14 OP1
3-Chloroperoxybenzoic acid UN3106 ≤57 ≥3 ≥40 OP7
3-Chloroperoxybenzoic acid UN3106 ≤77 ≥6 ≥17 OP7
Cumyl hydroperoxide UN3107 >90-98 ≤10 OP8 13
Cumyl hydroperoxide UN3109 ≤90 ≥10 OP8 13, 15
Cumyl peroxyneodecanoate 3115 ≤87 ≥13 OP7 −10 0
Cumyl peroxyneodecanoate UN3115 ≤77 ≥23 OP7 −10 0
Cumyl peroxyneodecanoate [as a stable dispersion in water] UN3119 ≤52 OP8 −10 0
Cumyl peroxyneoheptanoate UN3115 ≤77 ≥23 OP7 −10 0
Cumyl peroxypivalate UN3115 ≤77 ≥23 OP7 −5 5
Cyclohexanone peroxide(s) UN3104 ≤91 ≥9 OP6 13
Cyclohexanone peroxide(s) UN3105 ≤72 ≥28 OP7 5
Cyclohexanone peroxide(s) [as a paste] UN3106 ≤72 OP7 5, 21
Cyclohexanone peroxide(s) Exempt ≤32 >68 Exempt 29
Diacetone alcohol peroxides UN3115 ≤57 ≥26 ≥8 OP7 40 45 5
Diacetyl peroxide UN3115 ≤27 ≥73 OP7 20 25 8,13
Di-tert-amyl peroxide UN3107 ≤100 OP8
2,2-Di-(tert-amylperoxy)-butane 3105 ≤57 ≥43 OP7
Code of Federal Regulations 559
1,1-Di-(tert-amylperoxy)cyclohexane UN3103 ≤82 ≥18 OP6
Dibenzoyl peroxide UN3102 >51-100 ≤48 OP2 3
Dibenzoyl peroxide UN3102 >77-94 ≥6 OP4 3
Dibenzoyl peroxide UN3104 ≤77 ≥23 OP6
Dibenzoyl peroxide UN3106 ≤62 ≥28 ≥10 OP7
Dibenzoyl peroxide [as a paste] UN3106 >52-62 OP7 21
Dibenzoyl peroxide UN3106 >35-52 ≥48 OP7
Dibenzoyl peroxide UN3107 >36-42 ≥18 ≤40 OP8
Dibenzoyl peroxide [as a paste] UN3108 ≤56.5 ≥15 OP8
Dibenzoyl peroxide [as a paste] UN3108 ≤52 OP8 21
Dibenzoyl peroxide [as a stable dispersion in water] UN3109 ≤42 OP8
Dibenzoyl peroxide Exempt ≤35 ≥65 Exempt 29
Di-(4-tert-butylcyclohexyl)peroxydicarbonate UN3114 ≤100 OP6 30 35
Di-(4-tert-butylcyclohexyl)peroxydicarbonate [as a stable dispersion in water] UN3119 ≤42 OP8 30 35
Di-tert-butyl peroxide UN3107 >52-100 OP8
Di-tert-butyl peroxide UN3109 ≤52 ≥48 OP8 24
Di-tert-butyl peroxyazelate UN3105 ≤52 ≥48 OP7
2,2-Di-(tert-butylperoxy)butane UN3103