Module 1: Regulations - International Association of Fire Fighters

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IAFF Training for Hazardous Materials: Technician© Student Text Packing groups for Division 4.1 materials are based on the materials burning rate and zone of reaction. The following table shows the conditions of each packing group. PG Burning Rate Zone of Reaction (Metallic Powders) I None None II > 2.2°C mm/s and the < 5 minutes flame passes wet zone III < 2.2 mm/s 5 minutes < wet zone stops flame zone of reaction < 10 minutes Division 4.2 Spontaneously combustible materials, including the pyrophorics and self-heating materials, are included in Division 4.2. Specific examples are potassium sulfide and aluminum borohydride. PG Pyrophoric Liquids Self-Heating Positive Test Cube Size I All Pyrophorics N/A II N/A 2.5 mm III N/A 10.0 mm 1-32 Module 1: Regulations
Student Text IAFF Training for Hazardous Materials: Technician© Division 4.3 Dangerous when wet materials may ignite spontaneously or give off flammable or toxic gas when in contact with water. Specific examples are aluminum carbide, ethyldichlorosilane, and metal alloys. Packing Group Evolution of Gases (Flammable gas evolution is measured in liters/ kilograms per-time unit.) PG I PG II Spontaneous Ignition > 10 l/kg Any Minute > 20 l/kg Per-Hour PG III > 1 l/kg Per-Hour Class 5 Oxidizers Oxidizers release oxygen, which enhances the combustion of other materials. Class 5 materials are chemically active and are often involved in industrial reactions. For example, when an oxidizer is mixed with an organic, the result could be an explosion. Consequently, basic chemistry mandates isolation or segregation of Class 5 materials. Division 5.1 An oxidizer is a material that may, by yielding oxygen, cause or enhance the combustion of organic materials, such as wood or solvents. Examples are nitrates and aluminum dichromates. Packing groups are determined by mean burn times of the unknown, then compared to burn time of either an ammonium persulfate mixture or a potassium perbromate mixture. Module 1: Regulations 1-33
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Module 1: Regulations - International Association of Fire Fighters

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