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13 (iv) Tests. The generic type for a self - reactive material must be determined using the testing protocol from Figure 14.2 (Flow Chart for Assigning Self -Re- active Substances to Division 4.1) from the UN Recommendations on the Transport of Dangerous Goods, Tests and Criteria. (3) Readily combustible solids are materials that— (I) Are solids which may cause a fire through friction, such as matches; (ii) Show a burning rate faster than 2.2 mm (0.087 inches) per second when tested in accordance with UN Manual of Tests and Criteria; or (III) Any metal powders that can be ignited and react over the whole length of a sample in 10 minutes or less, when tested in accordance with UN Manual of Tests and Criteria. (b) Division 4.2 (Spontaneously Combus- tible Material). For the purposes of this subchapter, spontaneously combustible material (Division 4.2) means— (1) A pyrophoric material. A pyrophoric material is a liquid or solid that, even in small quantities and without an external ignition source, can ignite within five (5) minutes after coming in contact with air when tested according to UN Manual of Tests and Criteria. (2) A self -heating material. A self - heating material is a material that, when in contact with air and without an energy supply, is liable to self -heat. A material of this type which exhibits spontaneous ignition or if the tempera- ture of the sample exceeds 200 'C (392 *F) during the 24-hour test period when tested in accordance with UN Manual of Tests and Criteria, is classed as a Di- vision 4.2 material. (c) Division 4.3 (Dangerous when wet material). For the purposes of this chap- ter, dangerous when wet material (Divi- sion 4.3) means a material that, by con- tact with water, Is liable to become spontaneously flammable or to give off flammable or toxic gas at a rate great- er than I liter per kilogram of the ma- terial, per hour, when tested In accord - j §173.125 ance with UN Manual of Tests and Cri- teria. [Amdt. 173-224, 55 FR 52634, Dec. 21, 1990, as amended at 56 PR 66268, Dec, 20, 1991; 57 FR 45461, Oct. 1, 1992; Amdt. 173-233, 58 FR 33305, June 16, 1993; Amdt. 173-234, 58 FR 51532. Oct. 1, 1993; Amdt. 173-241, 59 FR 67507, Dec. 29. 1994: Amdt. 173-261, 62 FR 24731, May 6. 19971 § 173.125 Class 4—Assignment of pack- ing group. (a) The packing group of a Class 4 material is assigned in column (5) of the §172.101 table. When the §172.101 table provides more than one packing group for a hazardous material, the packing group shall be determined on the basis of test results following test methods given in the UN Manual of Tests and Criteria and by applying the appropriate criteria given in this sec- tion. (b) Packing group criteria for readily combustible materials of Division 4.1 are as follows: (1) Powdered, granular or pasty ma- terials must be classified in Division 4.1 when the time of burning of one or more of the test runs, in accordance with the UN Manual of Tests and Cri- teria, is less than 45 seconds or the rate of burning is more than 2.2 mm/s. Pow- ders of metals or metal alloys must be classified in Division 4,1 when they can be ignited and the reaction spreads over the whole length of the sample in 10 minutes or less. (2) Packing group criteria for readily combustible materials of Division 4.1 are assigned as follows: (I) For readily combustible solids (other than metal powders), Packing Group 11 if the burning time is less than 45 seconds and the flame passes the wetted zone. Packing Group 11 must be assigned to powders of metal or metal alloys if the zone of reaction spreads over the whole length of the sample in 5 minutes or less. (if) For readily combustible solids (other than metal powders), Packing Group III must be assigned if the burn- ing rate time is less than 45 seconds and the wetted zone stops the flame propagation for at least 4 minutes. Packing Group III must be assigned to UVA