What types of substances are typically found in Class II hazardous locations?

Class II hazardous locations are specifically identified by the presence of combustible dust. These environments can be found in various industries where materials such as grain, plastics, and chemicals are processed, handled, or stored. The defining characteristic of Class II locations is that these combustible dusts can create an explosive atmosphere when mixed with air and ignited by a spark or heat source.

In contrast, Class I hazardous locations involve flammable gases or vapors, making Option A unrelated to Class II. Extreme heat sources, as mentioned in Option C, do not specifically pertain to a classification of hazardous location either but could be a concern in any type of hazardous environment. Corrosive materials, referenced in Option D, do not align with the criteria set forth for Class II either, as they focus on the corrosive properties of substances rather than their potential to create an explosive atmosphere due to dust.

Understanding the nature of the substances in these environments is crucial for implementing adequate safety measures and ensuring compliance with regulations designed to prevent explosions and fires.