Regulations last checked for updates: Apr 29, 2024

Title 49 - Transportation last revised: Apr 11, 2024
All TitlesTitle 49Chapter IPart 173Subpart E - Subpart E—Non-bulk Packaging for Hazardous Materials Other Than Class 1 and Class 7
View all text of Subpart E [§ 173.158 - § 173.232]
§ 173.225 - Packaging requirements and other provisions for organic peroxides.
Link to an amendment published at 89 FR 25481, Apr. 10, 2024.

(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.

Table 1 to Paragraph (c)—Organic Peroxide Table

Technical name ID No. 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 peroxideUN3105≤42≥48≥8OP72
Acetyl acetone peroxide [as a paste]UN3106≤32OP721
Acetyl cyclohexanesulfonyl peroxideUN3112≤82≥12OP4−100
Acetyl cyclohexanesulfonyl peroxideUN3115≤32≥68OP7−100
tert-Amyl hydroperoxideUN3107≤88≥6≥6OP8
tert-Amyl peroxyacetateUN3105≤62≥38OP7
tert-Amyl peroxybenzoateUN3103≤100OP5
tert-Amyl peroxy-2-ethylhexanoateUN3115≤100OP7+20+25
tert-Amyl peroxy-2-ethylhexyl carbonateUN3105≤100OP7
tert-Amyl peroxy isopropyl carbonateUN3103≤77≥23OP5
tert-Amyl peroxyneodecanoateUN3115≤77≥23OP70+10
tert-Amyl peroxyneodecanoateUN3119≤47≥53OP80+10
tert-Amyl peroxypivalateUN3113≤77≥23OP5+10+15
tert-Amyl peroxypivalateUN3119≤32≥68OP8+10+15
tert-Amyl peroxy-3,5,5-trimethylhexanoateUN3105≤100OP7
tert-Butyl cumyl peroxideUN3109>42−100OP89
tert-Butyl cumyl peroxideUN3108≤52≥48OP89
n-Butyl-4,4-di-(tert-butylperoxy)valerateUN3103>52−100OP5
n-Butyl-4,4-di-(tert-butylperoxy)valerateUN3108≤52≥48OP8
tert-Butyl hydroperoxideUN3103>79−90≥10OP513
tert-Butyl hydroperoxideUN3105≤80≥20OP74, 13
tert-Butyl hydroperoxideUN3107≤79>14OP813, 16
tert-Butyl hydroperoxideUN3109≤72≥28OP813
tert-Butyl hydroperoxide [and] Di-tert-butylperoxideUN3103<82 + >9≥7OP513
tert-Butyl monoperoxymaleateUN3102>52−100OP5
tert-Butyl monoperoxymaleateUN3103≤52≥48OP6
tert-Butyl monoperoxymaleateUN3108≤52≥48OP8
tert-Butyl monoperoxymaleate [as a paste]UN3108≤52OP8
tert-Butyl peroxyacetateUN3101>52−77≥23OP5
tert-Butyl peroxyacetateUN3103>32−52≥48OP6
tert-Butyl peroxyacetateUN3109≤32≥68OP8
tert-Butyl peroxybenzoateUN3103>77−100OP5
tert-Butyl peroxybenzoateUN3105>52−77≥23OP71
tert-Butyl peroxybenzoateUN3106≤52≥48OP7
tert-Butyl peroxybenzoateUN3109≤32≥68OP8
tert-Butyl peroxybutyl fumarateUN3105≤52≥48OP7
tert-Butyl peroxycrotonateUN3105≤77≥23OP7
tert-Butyl peroxydiethylacetateUN3113≤100OP5+20+25
tert-Butyl peroxy-2-ethylhexanoateUN3113>52−100OP6+20+25
tert-Butyl peroxy-2-ethylhexanoateUN3117>32−52≥48OP8+30+35
tert-Butyl peroxy-2-ethylhexanoateUN3118≤52≥48OP8+20+25
tert-Butyl peroxy-2-ethylhexanoateUN3119≤32≥68OP8+40+45
tert-Butyl peroxy-2-ethylhexanoate [and] 2,2-di-(tert-Butylperoxy)butaneUN3106≤12 + ≤14≥14≥60OP7
tert-Butyl peroxy-2-ethylhexanoate [and] 2,2-di-(tert-Butylperoxy)butaneUN3115≤31 + ≤36≥33OP7+35+40
tert-Butyl peroxy-2-ethylhexylcarbonateUN3105≤100OP7
tert-Butyl peroxyisobutyrateUN3111>52−77≥23OP5+15+20
tert-Butyl peroxyisobutyrateUN3115≤52≥48OP7+15+20
tert-Butylperoxy isopropylcarbonateUN3103≤77≥23OP5
1-(2-tert-Butylperoxy isopropyl)-3-isopropenylbenzeneUN3105≤77≥23OP7
1-(2-tert-Butylperoxy isopropyl)-3-isopropenylbenzeneUN3108≤42≥58OP8
tert-Butyl peroxy-2-methylbenzoateUN3103≤100OP5
tert-Butyl peroxyneodecanoateUN3115>77−100OP7−5+5
tert-Butyl peroxyneodecanoateUN3115≤77≥23OP70+10
tert-Butyl peroxyneodecanoate [as a stable dispersion in water]UN3119≤52OP80+10
tert-Butyl peroxyneodecanoate [as a stable dispersion in water (frozen)]UN3118≤42OP80+10
tert-Butyl peroxyneodecanoateUN3119≤32≥68OP80+10
tert-Butyl peroxyneoheptanoateUN3115≤77≥23OP70+10
tert-Butyl peroxyneoheptanoate [as a stable dispersion in water]UN3117≤42OP80+10
tert-Butyl peroxypivalateUN3113>67−77≥23OP50+10
tert-Butyl peroxypivalateUN3115>27−67≥33OP70+10
tert-Butyl peroxypivalateUN3119≤27≥73OP8+30+35
tert-Butylperoxy stearylcarbonateUN3106≤100OP7
tert-Butyl peroxy-3,5,5-trimethylhexanoateUN3105>37−100OP7
tert-Butyl peroxy-3,5,5-trimethlyhexanoateUN3106≤42≥58OP7
tert-Butyl peroxy-3,5,5-trimethylhexanoateUN3109≤37≥63OP8
3-Chloroperoxybenzoic acidUN3102>57−86≥14OP1
3-Chloroperoxybenzoic acidUN3106≤57≥3≥40OP7
3-Chloroperoxybenzoic acidUN3106≤77≥6≥17OP7
Cumyl hydroperoxideUN3107>90−98≤10OP813
Cumyl hydroperoxideUN3109≤90≥10OP813, 15
Cumyl peroxyneodecanoateUN3115≤87≥13OP7−100
Cumyl peroxyneodecanoateUN3115≤77≥23OP7−100
Cumyl peroxyneodecanoate [as a stable dispersion in water]UN3119≤52OP8−100
Cumyl peroxyneoheptanoateUN3115≤77≥23OP7−100
Cumyl peroxypivalateUN3115≤77≥23OP7−5+5
Cyclohexanone peroxide(s)UN3104≤91≥9OP613
Cyclohexanone peroxide(s)UN3105≤72≥28OP75
Cyclohexanone peroxide(s) [as a paste]UN3106≤72OP75, 21
Cyclohexanone peroxide(s)Exempt≤32>68Exempt29
Diacetone alcohol peroxidesUN3115≤57≥26≥8OP7+40+455
Diacetyl peroxideUN3115≤27≥73OP7+20+258,13
Di-tert-amyl peroxideUN3107≤100OP8
([3R- (3R, 5aS, 6S, 8aS, 9R, 10R, 12S, 12aR**)]-Decahydro-10-methoxy-3, 6, 9-trimethyl-3, 12-epoxy-12H-pyrano [4, 3- j]-1, 2-benzodioxepin)UN3106≤100OP7
2,2-Di-(tert-amylperoxy)-butaneUN3105≤57≥43OP7
1,1-Di-(tert-amylperoxy)cyclohexaneUN3103≤82≥18OP6
Dibenzoyl peroxideUN3102>52−100≤48OP23
Dibenzoyl peroxideUN3102>77−94≥6OP43
Dibenzoyl peroxideUN3104≤77≥23OP6
Dibenzoyl peroxideUN3106≤62≥28≥10OP7
Dibenzoyl peroxide [as a paste]UN3106>52−62OP721
Dibenzoyl peroxideUN3106>35−52≥48OP7
Dibenzoyl peroxideUN3107>36−42≥18≤40OP8
Dibenzoyl peroxide [as a paste]UN3108≤56.5≥15OP8
Dibenzoyl peroxide [as a paste]UN3108≤52OP821
Dibenzoyl peroxide [as a stable dispersion in water]UN3109≤42OP8
Dibenzoyl peroxideExempt≤35≥65Exempt29
Di-(4-tert-butylcyclohexyl)peroxydicarbonateUN3114≤100OP6+30+35
Di-(4-tert-butylcyclohexyl)peroxydicarbonate [as a stable dispersion in water]UN3119≤42OP8+30+35
Di-(4-tert-butylcyclohexyl)peroxydicarbonate [as a paste]UN3116≤42OP7+35+40
Di-tert-butyl peroxideUN3107>52−100OP8
Di-tert-butyl peroxideUN3109≤52≥48OP824
Di-tert-butyl peroxyazelateUN3105≤52≥48OP7
2,2-Di-(tert-butylperoxy)butaneUN3103≤52≥48OP6
1,6-Di-(tert-butylperoxycarbonyloxy)hexaneUN3103≤72≥28OP5
1,1-Di-(tert-butylperoxy)cyclohexaneUN3101>80−100OP5
1,1-Di-(tert-butylperoxy)cyclohexaneUN3103>52−80≥20OP5
1,1-Di-(tert-butylperoxy)-cyclohexaneUN3103≤72≥28OP530
1,1-Di-(tert-butylperoxy)cyclohexaneUN3105>42−52≥48OP7
1,1-Di-(tert-butylperoxy)cyclohexaneUN3106≤42≥13≥45OP7
1,1-Di-(tert-butylperoxy)cyclohexaneUN3107≤27≥25OP822
1,1-Di-(tert-butylperoxy)cyclohexaneUN3109≤42≥58OP8
1,1-Di-(tert-Butylperoxy) cyclohexaneUN3109≤37≥63OP8
1,1-Di-(tert-butylperoxy)cyclohexaneUN3109≤25≥25≥50OP8
1,1-Di-(tert-butylperoxy)cyclohexaneUN3109≤13≥13≥74OP8
1,1-Di-(tert-butylperoxy)cyclohexane + tert-Butyl peroxy-2-ethylhexanoateUN3105≤43 + ≤16≥41OP7
Di-n-butyl peroxydicarbonateUN3115>27−52≥48OP7−15−5
Di-n-butyl peroxydicarbonateUN3117≤27≥73OP8−100
Di-n-butyl peroxydicarbonate [as a stable dispersion in water (frozen)]UN3118≤42OP8−15−5
Di-sec-butyl peroxydicarbonateUN3113>52−100OP4−20−106
Di-sec-butyl peroxydicarbonateUN3115≤52≥48OP7−15−5
Di-(tert-butylperoxyisopropyl) benzene(s)UN3106>42−100≤57OP71, 9
Di-(tert-butylperoxyisopropyl) benzene(s)Exempt≤42≥58Exempt
Di-(tert-butylperoxy)phthalateUN3105>42−52≥48OP7
Di-(tert-butylperoxy)phthalate [as a paste]UN3106≤52OP721
Di-(tert-butylperoxy)phthalateUN3107≤42≥58OP8
2,2-Di-(tert-butylperoxy)propaneUN3105≤52≥48OP7
2,2-Di-(tert-butylperoxy)propaneUN3106≤42≥13≥45OP7
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3101>90−100OP5
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3103>57−90≥10OP5
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3103≤77≥23OP5
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3103≤90≥10OP530
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3110≤57≥43OP8
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3107≤57≥43OP8
1,1-Di-(tert-butylperoxy)-3,3,5-trimethylcyclohexaneUN3107≤32≥26≥42OP8
Dicetyl peroxydicarbonateUN3120≤100OP8+30+35
Dicetyl peroxydicarbonate [as a stable dispersion in water]UN3119≤42OP8+30+35
Di-4-chlorobenzoyl peroxideUN3102≤77≥23OP5
Di-4-chlorobenzoyl peroxideExempt≤32≥68Exempt29
Di-2,4-dichlorobenzoyl peroxide [as a paste]UN3118≤52OP8+20+25
Di-4-chlorobenzoyl peroxide [as a paste]UN3106≤52OP721
Dicumyl peroxideUN3110>52−100≤48OP89
Dicumyl peroxideExempt≤52≥48Exempt29
Dicyclohexyl peroxydicarbonateUN3112>91−100OP3+10+15
Dicyclohexyl peroxydicarbonateUN3114≤91≥9OP5+10+15
Dicyclohexyl peroxydicarbonate [as a stable dispersion in water]UN3119≤42OP8+15+20
Didecanoyl peroxideUN3114≤100OP6+30+35
2,2-Di-(4,4-di(tert-butylperoxy)cyclohexyl)propaneUN3106≤42≥58OP7
2,2-Di-(4,4-di(tert-butylperoxy)cyclohexyl)propaneUN3107≤22≥78OP8
Di-2,4-dichlorobenzoyl peroxideUN3102≤77≥23OP5
Di-2,4-dichlorobenzoyl peroxide [as a paste with silicone oil]UN3106≤52OP7
Di-(2-ethoxyethyl) peroxydicarbonateUN3115≤52≥48OP7−100
Di-(2-ethylhexyl) peroxydicarbonateUN3113>77−100OP5−20−10
Di-(2-ethylhexyl) peroxydicarbonateUN3115≤77≥23OP7−15−5
Di-(2-ethylhexyl) peroxydicarbonate [as a stable dispersion in water]UN3119≤62OP8−15−5
Di-(2-ethylhexyl) peroxydicarbonate [as a stable dispersion in water]UN3119≤52OP8−15−5
Di-(2-ethylhexyl) peroxydicarbonate [as a stable dispersion in water (frozen)]UN3120≤52OP8−15−5
2,2-DihydroperoxypropaneUN3102≤27≥73OP5
Di-(1-hydroxycyclohexyl)peroxideUN3106≤100OP7
Diisobutyryl peroxideUN3111>32−52≥48OP5−20−10
Diisobutyryl peroxide [as a stable dispersion in water]UN3119≤42OP8−20−10
Diisobutyryl peroxideUN3115≤32≥68OP7−20−10
Diisopropylbenzene dihydroperoxideUN3106≤82≥5≥5OP717
Diisopropyl peroxydicarbonateUN3112>52−100OP2−15−5
Diisopropyl peroxydicarbonateUN3115≤52≥48OP7−20−10
Diisopropyl peroxydicarbonateUN3115≤32≥68OP7−15−5
Dilauroyl peroxideUN3106≤100OP7
Dilauroyl peroxide [as a stable dispersion in water]UN3109≤42OP8
Di-(3-methoxybutyl) peroxydicarbonateUN3115≤52≥48OP7−5+5
Di-(2-methylbenzoyl)peroxideUN3112≤87≥13OP5+30+35
Di-(4-methylbenzoyl)peroxide [as a paste with silicone oil]UN3106≤52OP7
Di-(3-methylbenzoyl) peroxide + Benzoyl (3-methylbenzoyl) peroxide + Dibenzoyl peroxideUN3115≤20 + ≤18 + ≤4≥58OP7+35+40
2,5-Dimethyl-2,5-di-(benzoylperoxy)hexaneUN3102>82−100OP5
2,5-Dimethyl-2,5-di-(benzoylperoxy)hexaneUN3106≤82≥18OP7
2,5-Dimethyl-2,5-di-(benzoylperoxy)hexaneUN3104≤82≥18OP5
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexaneUN3103>90−100OP5
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexaneUN3105>52—90≥10OP7
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexaneUN3108≤77≥23OP8
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexaneUN3109≤52≥48OP8
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexane [as a paste]UN3108≤47OP8
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexyne-3UN3101>86−100OP5
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexyne-3UN3103>52−86≥14OP5
2,5-Dimethyl-2,5-di-(tert-butylperoxy)hexyne-3UN3106≤52≥48OP7
2,5-Dimethyl-2,5-di-(2-ethylhexanoylperoxy)hexaneUN3113≤100OP5+20+25
2,5-Dimethyl-2,5-dihydroperoxyhexaneUN3104≤82≥18OP6
2,5-Dimethyl-2,5-di-(3,5,5-trimethylhexanoylperoxy)hexaneUN3105≤77≥23OP7
1,1-Dimethyl-3-hydroxybutylperoxyneoheptanoateUN3117≤52≥48OP80+10
Dimyristyl peroxydicarbonateUN3116≤100OP7+20+25
Dimyristyl peroxydicarbonate [as a stable dispersion in water]UN3119≤42OP8+20+25
Di-(2-neodecanoylperoxyisopropyl)benzeneUN3115≤52≥48OP7−100
Di-(2-neodecanoyl-peroxyisopropyl) benzene, as stable dispersion in waterUN3119≤42OP8−15−5
Di-n-nonanoyl peroxideUN3116≤100OP70+10
Di-n-octanoyl peroxideUN3114≤100OP5+10+15
Di-(2-phenoxyethyl)peroxydicarbonateUN3102>85−100OP5
Di-(2-phenoxyethyl)peroxydicarbonateUN3106≤85≥15OP7
Dipropionyl peroxideUN3117≤27≥73OP8+15+20
Di-n-propyl peroxydicarbonateUN3113≤100OP3−25−15
Di-n-propyl peroxydicarbonateUN3113≤77≥23OP5−20−10
Disuccinic acid peroxideUN3102>72−100OP418
Disuccinic acid peroxideUN3116≤72≥28OP7+10+15
Di-(3,5,5-trimethylhexanoyl) peroxideUN3115>52−82≥18OP70+10
Di-(3,5,5-trimethylhexanoyl)peroxide [as a stable dispersion in water]UN3119≤52OP8+10+15
Di-(3,5,5-trimethylhexanoyl) peroxideUN3119>38−52≥48OP8+10+15
Di-(3,5,5-trimethylhexanoyl)peroxideUN3119≤38≥62OP8+20+25
Ethyl 3,3-di-(tert-amylperoxy)butyrateUN3105≤67≥33OP7
Ethyl 3,3-di-(tert-butylperoxy)butyrateUN3103>77−100OP5
Ethyl 3,3-di-(tert-butylperoxy)butyrateUN3105≤77≥23OP7
Ethyl 3,3-di-(tert-butylperoxy)butyrateUN3106≤52≥48OP7
1-(2-ethylhexanoylperoxy)-1,3-Dimethylbutyl peroxypivalateUN3115≤52≥45≥10OP7−20−10
tert-Hexyl peroxyneodecanoateUN3115≤71≥29OP70+10
tert-Hexyl peroxypivalateUN3115≤72≥28OP7+10+15
3-Hydroxy-1,1-dimethylbutyl peroxyneodecanoateUN3115≤77≥23OP7−5+5
3-Hydroxy-1,1-dimethylbutyl peroxyneodecanoate [as a stable dispersion in water]UN3119≤52OP8−5+5
3-Hydroxy-1,1-dimethylbutyl peroxyneodecanoateUN3117≤52≥48OP8−5+5
Isopropyl sec-butyl peroxydicarbonat + Di-sec-butyl peroxydicarbonate + Di-isopropyl peroxydicarbonateUN3111≤52 + ≤28 + ≤22OP5−20−10
Isopropyl sec-butyl peroxydicarbonate + Di-sec-butyl peroxydicarbonate + Di-isopropyl peroxydicarbonateUN3115≤32 + ≤15 −18 + ≤12 −15≥38OP7−20−10
Isopropylcumyl hydroperoxideUN3109≤72≥28OP813
p-Menthyl hydroperoxideUN3105>72−100OP713
p-Menthyl hydroperoxideUN3109≤72≥28OP8
Methylcyclohexanone peroxide(s)UN3115≤67≥33OP7+35+40
Methyl ethyl ketone peroxide(s)UN3101≤52≥48OP55, 13
Methyl ethyl ketone peroxide(s)UN3105≤45≥55OP75
Methyl ethyl ketone peroxide(s)UN3107≤40≥60OP87
Methyl isobutyl ketone peroxide(s)UN3105≤62≥19OP75, 23
Methyl isopropyl ketone peroxide(s)UN3109(See remark 31)≥70OP831
Organic peroxide, liquid, sampleUN3103OP212
Organic peroxide, liquid, sample, temperature controlledUN3113OP212
Organic peroxide, solid, sampleUN3104OP212
Organic peroxide, solid, sample, temperature controlledUN3114OP212
3,3,5,7,7-Pentamethyl-1,2,4-TrioxepaneUN3107≤100OP8
Peroxyacetic acid, type D, stabilizedUN3105≤43OP713, 20
Peroxyacetic acid, type E, stabilizedUN3107≤43OP813, 20
Peroxyacetic acid, type F, stabilizedUN3109≤43OP813, 20, 28
Peroxyacetic acid or peracetic acid [with not more than 7% hydrogen peroxide]UN3107≤36≥15OP813, 20, 28
Peroxyacetic acid or peracetic acid [with not more than 20% hydrogen peroxide]Exempt≤6≥60Exempt28
Peroxyacetic acid or peracetic acid [with not more than 26% hydrogen peroxide]UN3109≤17OP813, 20, 28
Peroxylauric acidUN3118≤100OP8+35+40
1-Phenylethyl hydroperoxideUN3109≤38≥62OP8
Pinanyl hydroperoxideUN3105>56−100OP713
Pinanyl hydroperoxideUN3109≤56≥44OP8
Polyether poly-tert-butylperoxycarbonateUN3107≤52≥48OP8
Tetrahydronaphthyl hydroperoxideUN3106≤100OP7
1,1,3,3-Tetramethylbutyl hydroperoxideUN3105≤100OP7
1,1,3,3-Tetramethylbutyl peroxy-2-ethylhexanoateUN3115≤100OP7+15+20
1,1,3,3-Tetramethylbutyl peroxyneodecanoateUN3115≤72≥28OP7−5+5
1,1,3,3-Tetramethylbutyl peroxyneodecanoate [as a stable dispersion in water]UN3119≤52OP8−5+5
1,1,3,3-tetramethylbutyl peroxypivalateUN3115≤77≥23OP70+10
3,6,9-Triethyl-3,6,9-trimethyl-1,4,7-triperoxonaneUN3110≤17≥18≥65OP8
3,6,9-Triethyl-3,6,9-trimethyl-1,4,7-triperoxonaneUN3105≤42≥58OP726

Notes:

1. For domestic shipments, OP8 is authorized.

2. Available oxygen must be <4.7%.

3. For concentrations <80% OP5 is allowed. For concentrations of at least 80% but <85%, OP4 is allowed. For concentrations of at least 85%, maximum package size is OP2.

4. The diluent may be replaced by di-tert-butyl peroxide.

5. Available oxygen must be ≤9% with or without water.

6. For domestic shipments, OP5 is authorized.

7. Available oxygen must be ≤8.2% with or without water.

8. Only non-metallic packagings are authorized.

9. For domestic shipments this material may be transported under the provisions of paragraph (h)(3)(xii) of this section.

10. [Reserved]

11. [Reserved]

12. Samples may only be offered for transportation under the provisions of paragraph (b)(2) of this section.

13. “Corrosive” subsidiary risk label is required.

14. [Reserved]

15. No “Corrosive” subsidiary risk label is required for concentrations below 80%.

16. With <6% di-tert-butyl peroxide.

17. With ≤8% 1-isopropylhydroperoxy-4-isopropylhydroxybenzene.

18. Addition of water to this organic peroxide will decrease its thermal stability.

19. [Reserved]

20. Mixtures with hydrogen peroxide, water and acid(s).

21. With diluent type A, with or without water.

22. With ≥36% diluent type A by mass, and in addition ethylbenzene.

23. With ≥19% diluent type A by mass, and in addition methyl isobutyl ketone.

24. Diluent type B with boiling point >100 C.

25. No “Corrosive” subsidiary risk label is required for concentrations below 56%.

26. Available oxygen must be ≤7.6%.

27. Formulations derived from distillation of peroxyacetic acid originating from peroxyacetic acid in a concentration of not more than 41% with water, total active oxygen less than or equal to 9.5% (peroxyacetic acid plus hydrogen peroxide).

28. For the purposes of this section, the names “Peroxyacetic acid” and “Peracetic acid” are synonymous.

29. Not subject to the requirements of this subchapter for Division 5.2.

30. Diluent type B with boiling point >130 °C (266 °F).

31. Available oxygen ≤6.7%.

(d) Packing Method Table. Packagings for organic peroxides and self-reactive substances are listed in the Maximum Quantity per Packing Method Table. The packing methods are designated OP1 to OP8. The quantities specified for each packing method represent the maximum that is authorized.

(1) The following types of packagings are authorized:

(i) Drums: 1A1, 1A2, 1B1, 1B2, 1D, 1G, 1H1, 1H2;

(ii) Jerricans: 3A1, 3A2, 3B1, 3B2, 3H1, 3H2;

(iii) Boxes: 4C1, 4C2, 4D, 4F, 4G, 4H1, 4H2, 4A, 4B; or

(iv) Composite packagings with a plastic inner receptacle: 6HA1, 6HA2, 6HB1, 6HB2, 6HC, 6HD1, 6HD2, 6HG1, 6HG2, 6HH1, 6HH2.

(2) Metal packaging (including inner packagings of combination packagings and outer packagings of combination or composite packagings) are used only for packing methods OP7 and OP8.

(3) In combination packagings, glass receptacles are used only as inner packagings with a maximum content of 0.5 kg for solids or 0.5 L for liquids.

(4) The maximum quantity per packaging or package for Packing Methods OP1-OP8 must be as follows:

Table to Paragraph (d): Maximum Quantity per Packaging/Package

[For packing methods OP1 to OP8]

Maximum quantity Packing method
OP1 OP2 1 OP3 OP4 1 OP5 OP6 OP7 OP8
Solids and combination packagings (liquid and solid) (kg)0.50.5/1055/25255050 2 400
Liquids (L)0.55306060 3 225

1 If two values are given, the first applies to the maximum net mass per inner packaging and the second to the maximum net mass of the complete package.

2 60 kg for jerricans/200 kg for boxes and, for solids, 400 kg in combination packagings with outer packagings comprising boxes (4C1, 4C2, 4D, 4F, 4G, 4H1, and 4H2) and with inner packagings of plastics or fiber with a maximum net mass of 25 kg.

3 60 L for jerricans.

(e) Organic Peroxide IBC Table. The following Organic Peroxide IBC Table specifies, by technical name, those organic peroxides that are authorized for transportation in certain IBCs and not subject to the approval provisions of § 173.128 of this part. The formulations listed below may also be transported packed in accordance with packing method OP8 of this section, with the same control and emergency temperatures, if applicable. Additional requirements for authorized IBCs are found in paragraph (f) of this section.

Table 3 to Paragraph (e)—Organic Peroxide IBC Table

UN No. Organic peroxide Type of
IBC 		Maximum
quantity
(liters) 		Control
temperature 		Emergency
temperature
3109ORGANIC PEROXIDE, TYPE F, LIQUID:
tert-Butyl cumyl peroxide31HA11000
tert-Butyl hydroperoxide, not more than 72% with water31A1250
31HA11000
tert-Butyl peroxyacetate, not more than 32% in diluent type A31A1250
31HA11000
tert-Butyl peroxybenzoate, not more than 32% in diluent type A31A1250
tert-Butyl peroxy-3,5,5-trimethylhexanoate, not more than 37% in diluent type A31A1250
31HA11000
Cumyl hydroperoxide, not more than 90% in diluent type A31HA11250
Dibenzoyl peroxide, not more than 42% as a stable dispersion31H11000
2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane, not more than 52% in diluent type A31HA11000
Di-tert-butyl peroxide, not more than 52% in diluent type B31A1250
31HA11000
1,1-Di-(tert-Butylperoxy) cyclohexane, not more than 37% in diluent type A31A1250
1,1-Di-(tert-butylperoxy) cyclohexane, not more than 42% in diluent type A31H11000
Dicumyl peroxide, less than or equal to 100%31A1250
31HA11000
Dilauroyl peroxide, not more than 42%, stable dispersion, in water31HA11000
Isopropyl cumyl hydroperoxide, not more than 72% in diluent type A31HA11250
p-Menthyl hydroperoxide, not more than 72% in diluent type A31HA11250
Peroxyacetic acid, stabilized, not more than 17%31A1500
31H11500
31H21500
31HA11500
Peroxyacetic acid, not more than 26% hydrogen peroxide31A1500
31HA11500
Peroxyacetic acid, type F, stabilized31A1500
31HA11500
3,6,9-Triethyl-3,6,9-trimethyl-1,4,7-triperoxonane not more than 27% diluent type A31HA11000
3110ORGANIC PEROXIDE TYPE F, SOLID:
Dicumyl peroxide, less than or equal to 100%31A2000
31H1
31HA1
3119ORGANIC PEROXIDE, TYPE F, LIQUID, TEMPERATURE CONTROLLED:
tert-Amyl peroxy-2-ethylhexanoate, not more than 62% in a diluent type A31HA11000+15 °C+20 °C
tert-Amyl peroxypivalate, not more than 32% in diluent type A31A1250+10 °C+15 °C
tert-Amyl peroxypivalate, not more than 42% as a stable dispersion in water31HA11,0000 °C+10 °C
tert-Butyl peroxy-2-ethylhexanoate, not more than 32% in diluent type B31HA11000+30 °C+35 °C
31A1250+30 °C+35 °C
tert-Butyl peroxyneodecanoate, not more than 32% in diluent type A31A12500 °C+10 °C
tert-Butyl peroxyneodecanoate, not more than 52%, stable dispersion, in water31A1250−5 °C+5 °C
tert-Butyl peroxypivalate, not more than 27% in diluent type B31HA11000+10 °C+15 °C
31A1250+10 °C+15 °C
tert-Butyl peroxypivalate, not more than 42% in a diluent type A31HA1
31A 		1,000
1,250 		10 °C
10 °C 		15 °C
15 °C
Cumyl peroxyneodecanoate, not more than 52%, stable dispersion, in water31A1250−15 °C−5 °C
Di-(4-tert-butylcyclohexyl) peroxydicarbonate, not more than 42%, stable dispersion, in water31HA11000+30 °C+35 °C
Dicetyl peroxydicarbonate, not more than 42%, stable dispersion, in water31HA11000+30 °C+35 °C
Dicyclohexylperoxydicarbonate, not more than 42% as a stable dispersion, in water31A1250+10 °C+15 °C
Di-(2-ethylhexyl) peroxydicarbonate, not more than 62%, stable dispersion, in water31A1250−20 °C−10 °C
31HA11000−20 °C−10 °C
Diisobutyryl peroxide, not more than 28% as a stable dispersion in water31HA11000−20 °C−10 °C
31A1250−20 °C−10 °C
Diisobutyryl peroxide, not more than 42% as a stable dispersion in water31HA11000−25 °C−15 °C
31A1250−25 °C−15 °C
Dimyristyl peroxydicarbonate, not more than 42%, stable dispersion, in water31HA11000+15 °C+20 °C
Di-(2-neodecanoylperoxyisopropyl) benzene, not more than 42%, stable dispersion, in water31A1250−15 °C−5 °C
Di-(3,5,5-trimethylhexanoyl) peroxide, not more than 52% in diluent type A31HA11000+10 °C+15 °C
31A1250+10 °C+15 °C
Di-(3,5,5-trimethylhexanoyl) peroxide, not more than 52%, stable dispersion, in water31A1250+10 °C+15 °C
3-Hydroxy-1,1-dimethylbutyl peroxy-neodecanoate, not more than 52%, stable dispersion, in water31A1250−15 °C−5 °C
1,1,3,3-Tetramethylbutyl peroxy-2-ethylhexanoate, not more than 67%, in diluent type A31HA11000+15 °C+20 °C
1,1,3,3-Tetramethylbutyl peroxyneodecanoate, not more than 52%, stable dispersion, in water31A1250−5 °C+5 °C
31HA11000−5 °C+5 °C

(f) IBCs. IBCs are authorized subject to the conditions and limitations of this section if the IBC type is authorized according to paragraph (e) of this section, as applicable, and the IBC conforms to the requirements in subpart O of part 178 of this subchapter at the Packing Group II performance level. Type F organic peroxides or self-reactive substances are not authorized for transportation in IBCs other than those specified, unless approved by the Associate Administrator.

(1) IBCs shall be provided with a device to allow venting during transportation. The inlet to the pressure relief device shall be sited in the vapor space of the IBC under maximum filling conditions during transportation.

(2) To prevent explosive rupture of metal IBCs or composite IBCs with a complete metal casing, the emergency-relief devices shall be designed to vent all the decomposition products and vapors evolved during self-accelerating decomposition or during a period of not less than one hour of complete fire-engulfment as calculated by the formula in paragraph (h)(3)(v) of this section. The control and emergency temperatures specified in the Organic Peroxide IBC Table are based on a non-insulated IBC.

(g) Organic Peroxide Portable Tank Table. The following Organic Peroxide Portable Tank Table provides certain portable tank requirements and identifies, by technical name, those organic peroxides that are authorized for transportation in the bulk packagings listed in paragraph (h) of this section. Organic peroxides listed in this table, provided they meet the specific packaging requirements found in paragraph (h) of this section, are not subject to the approval provisions of § 173.128 of this part. In addition, the formulations listed below may also be transported packed in accordance with packing method OP8 of this section, with the same control and emergency temperatures, if applicable.

Table to Paragraph (g): Organic Peroxide Portable Tank Table

UN No. Hazardous material Minimum test pressure (bar) Minimum shell thickness (mm-reference steel)
See. . . 		Bottom opening requirements
See. . . 		Pressure-relief requirements See. . . Filling limits Control temperature Emergency temperature
3109ORGANIC PEROXIDE, TYPE F, LIQUID
tert-Butyl hydroperoxide, not more than 72% with water
*Provided that steps have been taken to achieve the safety equivalence of 65% tert-Butyl hydroperoxide and 35% water		4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
Cumyl hydro-peroxide, not more than 90% in diluent type A4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
Di-tert-butyl peroxide, not more 32% in diluent type A4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
Dicumyl peroxide, less than or equal to 100% in diluent type B4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
Isopropyl cumyl hydro-peroxide, not more than 72% in diluent type A4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
p-Menthyl hydro-peroxide, not more than 72% in diluent type A4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
Pinanyl hydro-peroxide, not more than 56% in diluent type A4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
3110ORGANIC PEROXIDE, TYPE F, SOLID
Dicumyl peroxide less than or equal to 100% with inert solids
*Maximum quantity per portable tank 2,000 kg		4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C)
3119ORGANIC PEROXIDE, TYPE F, LIQUID, TEMPERATURE CONTROLLED
tert-Amyl peroxyneodecanoate, not more than 47% in diluent type A4§ 178.274 (d)(2)§ 178.275 (d)(3)§ 178.275 (g)(1)Not more than 90% at 59 °F (15 °C)−10 °C−5 °C.
tert-Butyl peroxyacetate, not more than 32% in diluent type B4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C) + 30 °C + 35 °C
tert-Butyl peroxy-2-ethylhexanoate, not more than 32% in diluent B4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C) + 15 °C + 20 °C
tert-Butylperoxypivalate, not more than 27% in diluent type B4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C) + 5 °C + 10 °C
tert-Butyl peroxy-3,5,5-trimethyl-hexanoate, not more than 32% in diluent type B4§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C) + 35 °C + 40 °C
Di-(3,5,5-trimethyl-hexanoyl) peroxide, not more than 38% in diluent type A or type B4§ 178.274 (d)(2)§ 178.275 (d)(3)§ 178.275 (g)(1)Not more than 90% at 59 °F (15 °C)0 °C + 5 °C.
Peroxyacetic acid, distilled, stabilized, not more than 41%. 14§ 178.274(d)(2)§ 178.275(d)(3)§ 178.275(g)(1)Not more than 90% at 59 °F (15 °C) + 30 °C + 35 °C

Note: 1. “Corrosive” subsidiary risk placard is required.

(h) Bulk packagings other than IBCs. The following bulk packagings are authorized, subject to the conditions and limitations of this section, if the organic peroxide is listed in the Organic Peroxide Portable Tank Table and bulk packagings are authorized, or if the organic peroxide is specifically authorized for transport in a bulk packaging by this paragraph (h), and the bulk packaging conforms to the requirements of this subchapter:

(1) Rail cars. Class DOT 103, 104, 105, 109, 111, 112, 114, 115, or 120 fusion-weld tank car tanks are authorized. DOT 103W, 111A60F1 and 111A60W1 tank car tanks must have bottom outlets effectively sealed from inside. Gauging devices are required on DOT 103W tank car tanks. Riveted tank car tanks are not authorized.

(2) Cargo tanks. Specification MC 307, MC 310, MC 311, MC 312, DOT 407, and DOT 412 cargo tank motor vehicles with a tank design pressure of at least 172 kPa (25 psig) are authorized.

(3) Portable tanks. The following requirements apply to portable tanks intended for the transport of organic peroxides or self-reactive substances. DOT 51, 57, IM 101 portable tanks, and UN portable tanks that conform to the requirements of paragraph (g) of this section, are authorized. Type F organic peroxide or self-reactive substance formulations other than those indicated in the Organic Peroxide Portable Tank Table may be transported in portable tanks if approved by the Associate Administrator. The following conditions also apply:

(i) The portable tank must be designed for a test pressure of at least 0.4 MPa (4 bar).

(ii) The portable tank must be fitted with temperature-sensing devices.

(iii) The portable tank must be fitted with pressure relief devices and emergency-relief devices. Vacuum-relief devices may also be used. Pressure relief devices must operate at pressures determined according to both the properties of the hazardous material and the construction characteristics of the portable tank. Fusible elements are not allowed in the shell.

(iv) The pressure relief devices must consist of reclosing devices fitted to prevent significant build-up within the portable tank of the decomposition products and vapors released at a temperature of 50 °C (122 °F). The capacity and start-to-discharge pressure of the relief devices must be in accordance with the applicable requirements of this subchapter specified for the portable tank. The pressure relief devices must not allow liquid to escape in the event the portable tank is overturned in a loaded condition.

(v)(A) The emergency-relief devices may be of the reclosing or frangible types, or a combination of the two, designed to vent all the decomposition products and vapors evolved during a period of not less than one hour of complete fire engulfment as calculated by the following formula:

Where: q = heat absorption (W) A = wetted area (m 2) F = insulation factor (−)

(B) Insulation factor (F) in the formula in paragraph (h)(3)(v)(A) of this section equals 1 for non-insulated vessels and for insulated vessels F is calculated using the following formula:

Where: U = K/L = heat transfer coefficient of the insulation (W·m−2·K−1); where K = heat conductivity of insulation layer (W·m−1·K−1), and L = thickness of insulation layer (m). TPO = temperature of material at relieving conditions (K).

(vi) The start-to-discharge pressure of emergency-relief devices must be higher than that specified for the pressure relief devices in paragraph (h)(3)(iv) of this section. The emergency-relief devices must be sized and designed in such a way that the maximum pressure in the shell never exceeds the test pressure of the portable tank.

Note to paragraph (h)(3)(vi):

An example of a method to determine the size of emergency-relief devices is given in Appendix 5 of the UN Manual of Tests and Criteria (IBR, see § 171.7 of this subchapter). A second example of a test method for venting sizing is given in the American Institute of Chemical Engineers Process Safety Progress Journal, June 2002 issue (Vol. 21, No. 2) (Informational materials not requiring incorporation by reference, see § 171.7(b)).

(vii) For insulated portable tanks, the capacity and setting of emergency-relief devices must be determined assuming a loss of insulation from 1% of the surface area.

(viii) Vacuum-relief devices and reclosing devices on portable tanks used for flammable hazardous materials must be provided with flame arresters. Any reduction of the relief capacity caused by the flame arrester must be taken into account and the appropriate relief capacity must be provided.

(ix) Service equipment such as devices and external piping must be designed and constructed so that no hazardous material remains in them after filling the portable tank.

(x) Portable tanks may be either insulated or protected by a sun-shield. If the SADT of the hazardous material in the portable tank is 55 °C (131 °F) or less, the portable tank must be completely insulated. The outer surface must be finished in white or bright metal.

(xi) The degree of filling must not exceed 90% at 15 °C (59 °F).

(xii) DOT 57 metal portable tanks are authorized only for those materials or mixtures of two or more materials that are provided with a reference to Note 9 in Column 8 of the Organic Peroxide Table, found in paragraph (c) of this section. DOT 57 portable tanks must conform to the venting requirements of paragraph (f) of this section. These portable tanks are not subject to any other requirements of paragraph (h) of this section.

(4) For tertiary butyl hydroperoxide (TBHP), each tank car, cargo tank or portable tank must contain 7.6 cm (3.0 inches) low density polyethylene (PE) saddles having a melt index of at least 0.2 grams per 10 minutes (for example see, ASTM D1238, condition E) as part of the lading, with a ratio of PE to TBHP over a range of 0.008 to 0.012 by mass. Alternatively, plastic or metal containers equipped with fusible plugs having a melting point between 69 °C (156 °F) and 71 °C (160 °F) and filled with a sufficient quantity of water to dilute the TBHP to 65% or less by mass may be used. The PE saddles must be visually inspected after each trip and, at a minimum, once every 12 months, and replaced when discoloration, fracture, severe deformation, or other indication of change is noted.

[69 FR 76159, Dec. 20, 2004, as amended at 70 FR 34398, June 14, 2005; 72 FR 55693, Oct. 1, 2007; 74 FR 2260, Jan. 14, 2009; 78 FR 1089, Jan. 7, 2013; 78 FR 65482, Oct. 31, 2013; 80 FR 1160, Jan. 8, 2015; 81 FR 35542, June 2, 2016; 82 FR 15884, Mar. 30, 2017; 85 FR 27889, May 11, 2020; 87 FR 44996, July 26, 2022; 87 FR 79777, Dec. 27, 2022]
authority: 49 U.S.C. 5101-5128,44701; 49 CFR 1.81, 1.96 and 1.97
cite as: 49 CFR 173.225
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