Which of the following is NOT a characteristic of a Material Safety Data Sheet (MSDS)?

The distinction of an MSDS, or Material Safety Data Sheet, lies in its comprehensive role in providing crucial safety information about hazardous substances. One of its fundamental characteristics is that it is mandated for many hazardous materials used in workplaces, aligning with regulatory requirements designed to protect workers and emergency responders.

Consumer products fall under different regulatory frameworks compared to industrial chemicals. While labels and safety-related information for consumer products may be available, the use of MSDSs is not universally required for them. Therefore, the option that states it's optional for consumer products highlights the nature of MSDS application and underscores that these documents are not universally applicable to all products, especially in consumer markets.

In contrast, all other mentioned characteristics—health hazard information, emergency procedures, and identification of the flammable range—are essential components of an MSDS. They provide necessary details that inform users of the potential hazards and safe handling procedures associated with chemicals, facilitating appropriate responses in the event of exposure or accidents.