What type of classification system is utilized for hazardous materials?

The UN Hazard Classes system is a globally recognized classification system established by the United Nations to categorize hazardous materials based on their specific chemical and physical properties. This classification breaks down hazardous materials into distinct classes and divisions that indicate the nature of the hazard they pose, such as flammability, toxicity, corrosiveness, and environmental risk.

For example, Class 1 pertains to explosives, Class 2 to gases—including flammable and non-flammable gases—and so forth. This system is essential for facilitating international shipping and transportation of hazardous materials, ensuring that they are handled and transported safely and in compliance with international regulations.

While the other classification systems mentioned exist, they serve different purposes or operate within specific jurisdictions. RICS refers to the Royal Institution of Chartered Surveyors and does not classify hazardous materials. DOT Transportation Classes are specific to the United States Department of Transportation's guidelines for transporting hazardous materials but do not encompass the international scope that the UN Hazard Classes provide. HAZMAT Designation is a broader term that can refer to any hazardous material designation without the standardized structure that UN Hazard Classes offer.

Thus, the classification provided by the UN is crucial for the consistent and safe handling of hazardous materials across borders, making it the correct answer.