Which of the following is NOT a characteristic used to classify hazardous materials?

The classification of hazardous materials is primarily based on specific characteristics that reflect their danger or the potential harm they can cause. Among these, physical state, chemical properties, and specific risks are essential factors in determining how a material behaves and how it should be handled or stored.

Physical state refers to whether a material is a solid, liquid, or gas, which greatly affects its handling and potential for exposure. Chemical properties involve the reactivity and nature of the substance, such as flammability, toxicity, and corrosiveness, which are critical for assessing risk in various scenarios. Specific risks relate to the potential hazards presented by the material, such as health hazards, environmental hazards, and risks to property.

In contrast, cost of disposal does not influence the classification of a hazardous material but is rather a consideration for transportation, storage, or waste management. While it is important for logistical planning and operational budgeting, it does not provide insight into the physical or chemical properties of the material or the risks it poses. Thus, this aspect is unrelated to how hazardous materials are classified under regulatory guidelines and standards.