Final answer:
A website that provides detailed information on hazard class/division placards is the NFPA 704 Hazard Identification System, with additional regulations and listings provided by the DOT and EPA. OSHA's website also offers a list of highly hazardous chemicals.
Step-by-step explanation:
A website that provides information on which hazard class/division placard to use is the National Fire Protection Agency (NFPA) 704 Hazard Identification System. This system is specifically designed to categorize various substances according to their potential health, flammability, and reactivity risks, as well as special hazards. It uses a color-coded diamond with each color representing a different type of hazard. For example, the red diamond indicates fire hazard, the blue diamond stands for health hazard, the yellow diamond signifies reactivity, and the white diamond is for special hazards. Each hazard is ranked on a scale from 0 to 4.
Additionally, the United States Department of Transportation (DOT) regulates the use of these hazardous materials placards via their hazardous materials regulations. Similarly, the Environmental Protection Agency (EPA) has regulations for hazardous waste, and resources for these can be found on the LibreTexts™ website.
For a detailed list of highly hazardous chemicals and their corresponding placards, the Occupational Safety and Health Administration (OSHA) provides a list which can be extremely useful for those needing specific information on chemical hazards and the needed signage.