When should Material Safety Data Sheets be available for employees?

Material Safety Data Sheets (MSDS), now commonly referred to as Safety Data Sheets (SDS), must be available to employees at all times, which is why the option indicating they should be accessible 24 hours a day, 7 days a week, is the correct answer. This requirement ensures that employees can access critical safety information regarding hazardous substances they may encounter in the workplace, regardless of the time of day or week.

This constant availability is essential because workers may have varying shifts or may need to refer to the documents during an emergency situation. By having access to SDS at all times, employees can make informed decisions regarding safety and health, and they can adequately prepare for handling chemicals or substances in a safe manner.

The other options suggest limited availability, which does not meet the safety standards set by regulations like the Occupational Safety and Health Administration (OSHA). Therefore, restricting access to weekdays only, during training, or only during working hours does not adhere to the best practices for workplace safety regarding hazardous materials.