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Research and Special Programs Admin., DOT (b) Criteria for inclusion of viscous Class 3 materials in Packing Group 111. (1) Viscous Class 3 materials in Packing Group Il with a flash point of less than 23 *C (73'F) may be grouped in Packing Group III provided that— (I) Less than 3 percent of the clear solvent layer separates in the solvent separation test; (ii) The mixture does not contain any substances with a primary or a sub- sidiary risk of Division 6.1 or Class 8: (iii) The capacity of the packaging is not more than 30 L (7.9 gallons); and (iv) The viscosity and flash point are in accordance with the following table: � Jet di. � Flow time t in seconds ame- Flash point cz, ter in mm 20<L<60 ..............I above 17 IC (62.6 1'). WK100 ay. 10 'C (50 T). 20-4L532 above 5 IC (41 *F). 32<L<44 ,a I -C (312 T). 44<KI00 6 above -5 IC (23 11`). 100<t 6 - 5 IC (23 IF) and below. (2) The methods by which the tests referred to in paragraph (b)(1) of this section shall be performed are as fol- lows: (I) Viscosity test. The flow time in sec- onds is determined at 23 'C (73.4 IF) using the ISO standard cup with a 4 mm (0.16 inch) jet (ISO 2431:1984). Where the flow time exceeds 100 sec- onds, a further test is carried out using the ISO standard cup with a 6 mm (0.24 inch) jet. (ii) Solvent Separation Test. This test is carried out at 23 'C (73 IF) using a 100.0 ml (3 ounces) measuring cylinder of the stoppered type of approximately 25.0 cm (9.8 inches) total height and of a uniform internal diameter of approxi- mately 30 mm (1.2 inches) over the cali- brated section. The sample should be stirred to obtain a uniform consist- ency, and poured in up to the 100 ml (3 ounces) mark. The stopper should be inserted and the cylinder left standing undisturbed for 24 hours. After 24 hours, the height of the upper sepa- rated layer should be measured and the percentage of this layer as compared 9173.124 with the total height of the sample cal- culated. [Amdt. 173-224, 55 FR 52634, Dec. 21, 1990, as amended at 56 FIR 66268. Dec. 20, 1991; Arndt. 173-241, 59 FR 67507, Dec. 29, 1994 Arndt. 173- 255, 61 FR 50625, Sept. 26, 1996; 64 FR 10777, Mar. 5, 1999; 64 FR 51918, Sept. 27. 19991 § 173.124 Class 4, Divisions 4.1, 4.2 and 4.3—Definitions. (a) Division 4.1 (Flammable Solid). For the purposes of this subchapter, flam- mable solid (Division 4.1) means any of the following three types of materials: (1) Desensitized explosives that— (i) When dry are Explosives of Class I other than those of compatibility group A, which are wetted with suffi- cient water, alcohol, or plasticizer to suppress explosive properties; and (ii) Are specifically authorized by name either in the §172.10lTable or have been assigned a shipping name and hazard class by the Associate Ad- ministrator for Hazardous Materials Safety under the provisions of— (A) An exemption issued under sub- chapter A of this chapter: or (B) An approval issued under § 173.56(1) of this part. (2)(i) Self -reactive materials are ma- terials that are thermally unstable and that can undergo a strongly exothermic decomposition even with- out participation of oxygen (air). A ma- terial is excluded from this definition if any of the following applies: (A) The material meets the definition of an explosive as prescribed In subpart C of this part, in which case it must be classed as an explosive; (B) The material is forbidden from being offered for transportation ac- cording to §172.101 of this subchapter or § 173,21; (C) The material meets the definition of an oxidizer or organic peroxide as prescribed in subpart D of this part, in which case it must be so classed; (D) The material meets one of the following conditions: (1) Its heat of decomposition is less than 300 J/g; or (2) Its self -accelerating decomposi- tion temperature (SART) is greater than 75 *C (167 IF) for a 50 kg package; or 445