Hazardous Materials (Class 4 Definition: Flammable Solid)

Division 4.1 (Flammable Solid). Flammable solid (Division 4.1) means any of the following three types of materials:

1. Desensitized explosives that:

1. When dry are Explosives of Class 1 other than those of compatibility group A, which are wetted with sufficient water, alcohol, or plasticizer to suppress explosive properties; and

2. Are specifically authorized by name either in the Code of Federal Regulations Transportation (49) Part 172.101Table or have been assigned a shipping name and hazard class by the Associate Administrator for Hazardous Materials Safety.

2. Self-reactive materials:

1. Materials that are thermally unstable and that can undergo a strongly exothermic decomposition even without participation of oxygen (air).

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 the Code of Federal Regulations Transportation (49) Part 173.224 is assigned to a generic type in accordance with that table. Self-reactive materials not identified in the Self-Reactive Materials Table are assigned to generic types.

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.