Class 4 Flammable Solid

Additional Details

Flammable Solid Division 4.1

1. Desensitized explosives
1. When dry are Explosives of Class 1 other than those of compatibility group A, which are wet with sufficient water, alcohol, or plasticized to suppress explosive properties; and are specifically authorized by name either in the 49CFR 172.101 Table or have been assigned a shipping name and hazard class by the Associate Administrator for Hazardous Materials Safety under the provisions of
1. An exemption issued under sub chapter A of this chapter; or an approval issued under 49CFR 173.56i of this part.
2. Self-reactive materials are materials that are thermally unstable and that can undergo a strongly exothermic decomposition even without participation of oxygen air . A material is excluded from this definition if any of the following applies:
1. 1. 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;
   2. The material is forbidden from being offered for transportation according to 49CFR 172.101 of this sub chapter or 49CFR 173.21;
   3. 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;
   4. The material meets one of the following conditions:
   1. Its heat of decomposition is less than 300 J/g; or
   2. Its self-accelerating decomposition temperature SADT is greater than 167øF for a 50 kg package; or
   5. The Associate Administrator for Hazardous Materials Safety has determined that the material does not present a hazard which is associated with a Division 4.1 material.
2. Generic types. Division 4.1 self-reactive materials are assigned to a generic system consisting of seven types. A self-reactive substance identified by technical name in the Self-Reactive Materials Table in 49CFR 173.224 is assigned to a generic type in accordance with that Table. Self-reactive materials not identified in the Self-Reactive Materials Table in 49CFR 173.224 are assigned to generic types under the procedures of paragraph a 2 iii of this section.
1. Type A. Self-reactive material type A is a self-reactive material which, as packaged for transportation, can detonate or deflagrate rapidly. Transportation of type A self-reactive material is forbidden.
2. Type B. Self-reactive material type B is a self-reactive material which, as packaged for transportation, neither detonates nor deflagrates rapidly, but is liable to undergo a thermal explosion in a package.
3. Type C. Self-reactive material type C is a self-reactive material which, as packaged for transportation, neither detonates nor deflagrates rapidly and cannot undergo a thermal explosion.
4. Type D. Self-reactive material type D is a self-reactive material which
   1. Detonates partially, does not deflagrate rapidly and shows no violent effect when heated under confinement;
   2. Does not detonate at all, deflagrates slowly and shows no violent effect when heated under confinement; or
   3. Does not detonate or deflagrate at all and shows a medium effect when heated under confinement.
5. Type E. Self-reactive material type E is a self-reactive material which, in laboratory testing, neither detonates nor deflagrates at all and shows only a low or no effect when heated under confinement.
6. Type F. Self-reactive material type F is a self-reactive material which, in laboratory testing, neither detonates in the cavitated state nor deflagrates at all and shows only a low or no effect when heated under confinement as well as low or no explosive power.
7. Type G. Self-reactive material type G is a self-reactive material which, in laboratory testing, does not detonate in the cavitated state, will not deflagrate at all, shows no effect when heated under confinement, nor shows any explosive power. A type G self-reactive material is not subject to the requirements of this subchapter for self-reactive material of Division 4.1 provided that it is thermally stable self-accelerating decomposition temperature is 122 øF or higher for a 110 pound package . A self-reactive material meeting all characteristics of type G except thermal stability is classed as a type F self-reactive, temperature control material.
3. Procedures for assigning a self-reactive material to a generic type. A self-reactive material must be assigned to a generic type based on
   1. Its physical state i.e. liquid or solid , in accordance with the definition of liquid and solid in 49CFR 171.8 of this subchapter;
   2. A determination as to its control temperature and emergency temperature, if any, under the provisions of 49CFR 173.21f ;
   3. Performance of the self-reactive material under the test procedures specified in the UN Recommendations on the Transport of Dangerous Goods, Tests and Criteria and the provisions of paragraph a 2 iii of this section; and
   4. Except for a self-reactive material which is identified by technical name in the Self-Reactive Materials Table in 49CFR 173.224b or a self-reactive material which may be shipped as a sample under the provisions of 49CFR 173.224, the self-reactive material is approved in writing by the Associate Administrator for Hazardous Materials Safety. The person requesting approval shall submit to the Associate Administrator for Hazardous Materials Safety the tentative shipping description and generic type and
      1. All relevant data concerning physical state, temperature controls, and tests results; or
      2. An approval issued for the self-reactive material by the competent authority of a foreign government.
   The generic type for a self-reactive material must be determined using the testing protocol from Figure 14.2 Flow Chart for Assigning Self-Reactive 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-
   1. Are solids which may cause a fire through friction, such as matches;
   2. 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
   3. 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.