U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jul 16, 2019

§ 173.224 - Packaging and control and emergency temperatures for self-reactive materials.

(a) General. When the § 172.101 table of this subchapter specifies that a Division 4.1 material be packaged in accordance with this section, only packagings which conform to the provisions of this section may be used. Each packaging must conform to the general packaging requirements of subpart B of this part and 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. Self-reactive materials which require temperature control are subject to the provisions of § 173.21(f). Packagings required to bear a Class 1 subsidiary label must conform to §§ 173.60 through 173.62.

(b) Self-Reactive Materials Table. The Self-Reactive Materials Table specifies, by technical name, those self-reactive materials that are authorized for transportation and not subject to the approval provisions of § 173.124(a)(2)(iii). A self-reactive material 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 Self-Reactive Materials Table are as follows:

(1) Technical name. Column 1 specifies the technical name.

(2) ID number. Column 2 specifies the identification number which is used to identify the proper shipping name in the § 172.101 table.

(3) Concentration of self-reactive material. Column 3 specifies the concentration (percent) limitations, if any, in mixtures or solutions for the self-reactive material. 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 percent to, and including 100 percent).

(4) Packing method. Column 4 specifies the highest packing method which is authorized for the self-reactive material. A packing method corresponding to a smaller package size may be used, but a packing method corresponding to a larger package size may not be used. The Table of Packing Methods in § 173.225(d) defines the packing methods. Bulk packagings for Type F self-reactive substances are authorized by § 173.225(f) for IBCs and § 173.225(h) for bulk packagings other than IBCs. Additional bulk packagings are authorized if approved by the Associate Administrator.

(5) Control temperature. Column 5 specifies the control temperature in °C. Temperatures are specified only when temperature controls are required (see § 173.21(f)).

(6) Emergency temperature. Column 6 specifies the emergency temperature in °C. Temperatures are specified only when temperature controls are required (see § 173.21(f)).

(7) Notes. Column 7 specifies other applicable provisions, as set forth in notes following the table.

Self-Reactive Materials Table

Self-reactive substance
Identification No.
Concentration - (%)
Packing method
Control temperature - (°C)
Emergency temperature
Acetone-pyrogallol copolymer 2-diazo-1-naphthol-5-sulphonate3228100OP8
Azodicarbonamide formulation type B, temperature controlled3232<100OP5 1
Azodicarbonamide formulation type C3224<100OP6
Azodicarbonamide formulation type C, temperature controlled3234<100OP6 1
Azodicarbonamide formulation type D3226<100OP7
Azodicarbonamide formulation type D, temperature controlled3236<100OP7 1
2,2′-Azodi(2,4-dimethyl-4-methoxyvaleronitrile)3236100OP7−5 + 5
2,2′-Azodi(2,4-dimethylvaleronitrile)3236100OP7 + 10 + 15
2,2′-Azodi(ethyl 2-methylpropionate)3235100OP7 + 20 + 25
2,2-Azodi(isobutyronitrile)3234100OP6 + 40 + 45
2,2′-Azodi(isobutyronitrile) as a water based paste3224≤50OP6
2,2-Azodi(2-methylbutyronitrile)3236100OP7 + 35 + 40
Benzene-1,3-disulphonylhydrazide, as a paste322652OP7
Benzene sulphohydrazide3226100OP7
4-(Benzyl(ethyl)amino)-3-ethoxybenzenediazonium zinc chloride3226100OP7
4-(Benzyl(methyl)amino)-3-ethoxybenzenediazonium zinc chloride3236100OP7 + 40 + 45
3-Chloro-4-diethylaminobenzenediazonium zinc chloride3226100OP7
2-Diazo-1-Naphthol sulphonic acid ester mixture3226<100OP7 4
2-Diazo-1-Naphthol-4-sulphonyl chloride3222100OP5
2-Diazo-1-Naphthol-5-sulphonyl chloride3222100OP5
2,5-Dibutoxy-4-(4-morpholinyl)-Benzenediazonium, tetrachlorozincate (2:1)3228100OP8
2,5-Diethoxy-4-morpholinobenzenediazonium zinc chloride323667-100OP7 + 35 + 40
2,5-Diethoxy-4-morpholinobenzenediazonium zinc chloride323666OP7 + 40 + 45
2,5-Diethoxy-4-morpholinobenzenediazonium tetrafluoroborate3236100OP7 + 30 + 35
2,5-Diethoxy-4-(phenylsulphonyl)benzenediazonium zinc chloride323667OP7 + 40 + 45
2,5-Diethoxy-4-(4-morpholinyl)-benzenediazonium sulphate3226100OP7
Diethylene glycol bis(allyl carbonate) + Diisopropylperoxydicarbonate3237≥88 + ≤12OP8−100
2,5-Dimethoxy-4-(4-methylphenylsulphony)benzenediazonium zinc chloride323679OP7 + 40 + 45
4-Dimethylamino-6-(2-dimethylaminoethoxy)toluene-2-diazonium zinc chloride3236100OP7 + 40 + 45
4-(Dimethylamino)-benzenediazonium trichlorozincate (-1)3228100OP8
N,N′-Dinitroso-N, N′-dimethyl-terephthalamide, as a paste322472OP6
N,N′-Dinitrosopentamethylenetetramine322482OP6 2
4-Dipropylaminobenzenediazonium zinc chloride3226100OP7
2-(N,N-Ethoxycarbonylphenylamino)-3-methoxy-4-(N-methyl-N- cyclohexylamino)benzenediazonium zinc chloride323663-92OP7 + 40 + 45
2-(N,N-Ethoxycarbonylphenylamino)-3-methoxy-4-(N-methyl-N- cyclohexylamino)benzenediazonium zinc chloride323662OP7 + 35 + 40
N-Formyl-2-(nitromethylene)-1,3-perhydrothiazine3236100OP7 + 45 + 50
2-(2-Hydroxyethoxy)-1-(pyrrolidin-1-yl)benzene-4-diazonium zinc chloride3236100OP7 + 45 + 50
3-(2-Hydroxyethoxy)-4-(pyrrolidin-1-yl)benzenediazonium zinc chloride3236100OP7 + 40 + 45
2-(N,N-Methylaminoethylcarbonyl)-4-(3,4-dimethyl-phenylsulphonyl)benzene diazonium zinc chloride323696OP7 + 45 + 50
3-Methyl-4-(pyrrolidin-1-yl)benzenediazonium tetrafluoroborate323495OP6 + 45 + 50
4-Nitrosophenol3236100OP7 + 35 + 40
Self-reactive liquid, sample3223 OP2 3
Self-reactive liquid, sample, temperature control3233 OP2 3
Self-reactive solid, sample3224 OP2 3
Self-reactive solid, sample, temperature control3234 OP2 3
Sodium 2-diazo-1-naphthol-4-sulphonate3226100OP7
Sodium 2-diazo-1-naphthol-5-sulphonate3226100OP7
Tetramine palladium (II) nitrate3234100OP6 + 30 + 35

Notes: 1. The emergency and control temperatures must be determined in accordance with § 173.21(f).

2. With a compatible diluent having a boiling point of not less than 150 °C.

3. Samples may only be offered for transportation under the provisions of paragraph (c)(3) of this section.

4. This entry applies to mixtures of esters of 2-diazo-1-naphthol-4-sulphonic acid and 2-diazo-1-naphthol-5-sulphonic acid.

(c) New self-reactive materials, formulations and samples. (1) Except as provided for samples in paragraph (c)(3) of this section, no person may offer, accept for transportation, or transport a self-reactive material which is not identified by technical name in the Self-Reactive Materials Table of this section, or a formulation of one or more self-reactive materials which are identified by technical name in the table, unless the self-reactive material is assigned a generic type and shipping description and is approved by the Associate Administrator under the provisions of § 173.124(a)(2)(iii).

(2) Except as provided by an approval issued under § 173.124(a)(2)(iii), intermediate bulk and bulk packagings are not authorized.

(3) Samples. Samples of new self-reactive materials or new formulations of self-reactive materials identified in the Self-Reactive Materials Table in paragraph (b) of this section, for which complete test data are not available, and which are to be transported for further testing or product evaluation, may be assigned an appropriate shipping description for Self-reactive materials 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 a self-reactive material 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;

(iii) Packages of the self-reactive material 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) Self-reactive, liquid, type C, 4.1, UN3223.

(B) Self-reactive, solid, type C, 4.1, UN3224.

(C) Self-reactive, liquid, type C, temperature controlled, 4.1, UN3233.

(D) Self-reactive, solid, type C, temperature controlled, 4.1, UN3234.

[Amdt. 173-241, 59 FR 67511, Dec. 29, 1994, as amended by Amdt. 173-242, 60 FR 26806, May 18, 1995; Amdt. 173-246, 60 FR 49110, Sept. 21, 1995; Amdt. 173-256, 61 FR 51338, Oct. 1, 1996; Amdt. 173-261, 62 FR 24734, 24735, May 6, 1997; 62 FR 45702, Aug. 28, 1997; 64 FR 10779, Mar. 5, 1999; 65 FR 58630, Sept. 29, 2000; 66 FR 33431, June 21, 2001; 66 FR 45379, Aug. 28, 2001; 68 FR 45035, July 31, 2003; 69 FR 76159, Dec. 20, 2004; 71 FR 78633, Dec. 29, 2006]