Poisonous and Irritating Materials

Poisonous materials are divided into three groups according to the degree of hazard presented in transportation. In decreasing order of hazard they are  

Class A Poisons are extremely dangerous poisonous gases or liquids of such nature that a very small amount of the gas, or vapor of the liquid, mixed with air is dangerous to life. In general, these materials appear listed hy technical name in the Hazardous Materials Table. 

Class B Poisons are dangerous liquids or solids which are known to be so toxic to man as to afford a hazard to health during transportation, or which, in the absence of human toxicity, are presumed to be toxic to man because they meet one of the following criteria when tested on laboratory animals  

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