Final answer:
Class D controlled products are divided based on their reactivity and oxidizing abilities, which are indicated by the yellow and white diamonds, respectively, in the NFPA 704 Hazard Identification System.
Step-by-step explanation:
The Class D controlled products are divided into two divisions based on their reactivity and oxidizing abilities. These divisions help to identify substances that are unstable under normal conditions, which might react with water, release toxic gases, or be capable of detonation or explosion under normal circumstances or when heated. Oxidizers are substances that contain oxygen which can cause other materials to combust, even in the absence of air or oxygen. An example of such a substance is potassium dichromate.
According to the National Fire Protection Agency (NFPA) 704 Hazard Identification System, the reactivity of substances, including those that are explosively reactive, is indicated by the yellow diamond, while special hazards, such as oxidizing abilities, are pointed out by the white diamond. The system provides key safety information about substances, rating their hazards on a scale from 0 to 4, with 0 indicating no hazard and 4 indicating extremely hazardous conditions.