Module 1: Regulations - International Association of Fire Fighters

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IAFF Training for Hazardous Materials: Technician© Student Text Division 2.3 Gases that are poisonous by inhalation are known to be toxic to humans and, therefore, pose a hazard to health during transportation. Because all Division 2.3 materials are poisonous-by-inhalation, they will be assigned one of four hazard zones (A,B,C,D). The hazard zone indicates the intensity of the hazard. In general, Zone A is the “most poisonous” and Zone D the “least poisonous.” Zone definitions are based on an established toxicity values (LC 50 ) determined from animal testing. For more information on gases which are poison-byinhalation, refer to 49 CFR 173.133. An example of a compressed gas that is poisonous-by-inhalation is hydrogen sulfide gas. Hazard Zone InhalationToxicity A LC 50 < 200 ppm B C D 200 ppm < LC 50 < 1000 ppm 1000 ppm < LC 50 < 5000 ppm 3000 ppm < LC 50 < 5000 ppm Class 3 Flammable and Combustible Liquids Flammable Liquid A flammable liquid is defined as “a liquid having a flash point of not more than 60.5°C (141°F).” Examples of Class 3 materials include acetone and isopropanol. Class 3 materials are divided into packing groups based on their degree of danger. The following chart distinguishes among Class 3 packing groups. 1-30 Module 1: Regulations
Student Text IAFF Training for Hazardous Materials: Technician© Initial Boiling Point (°C) PG Flash Point (Closed-Cup) Initial Boiling Point I < 35 C II < 23 C > 35 C III > 23 C < 60.5 C > 35 C Combustible Liquid (49 CFR 173.120) A combustible liquid has a flash point greater than 141°F/ less than 200°F and does not meet the definition of any other hazard class. A flammable liquid may be reclassified as a combustible liquid if the flash point is greater than 100°F/less than 141°F and the liquid does not meet the definition of any other hazard class. Hazardous materials regulations allow the shipper latitude over shipment of materials with a flashpoint between 141° and 200°F. Class 4 Flammable Solids Class 4 has three divisions: 4.1 (flammable solids), 4.2 (spontaneously combustible), and 4.3 (dangerous when wet). Even though the description of this hazardous characteristic identifies these materials as flammable solid, Division 4.2 materials do not have to be solid. For example, if a liquid is pyrophoric, it will be classed Division 4.2. The property of spontaneous combustion is more important than the form of the material. Division 4.1 Flammable solids include the following materials: • Wetted explosives • Self-reactive materials • Readily combustible solids • Metal powders Specific examples of Division 4.1 materials are as follows: hexamine; lead phosphate, dibasic; barium azide, wetted. Module 1: Regulations 1-31
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Module 1: Regulations - International Association of Fire Fighters

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