When can portable containers be used without the standard labeling requirements?

Portable containers can be used without the standard labeling requirements when they are used by the employee who transferred the chemical. This exception is based on the assumption that the employee who filled the portable container has comprehensive knowledge about the chemical, its hazards, and the appropriate safety measures that need to be taken. Since the employee is familiar with the properties of the chemical, it is not necessary to label the container with the same level of detail as would be required for other containers used in the workplace.

This provision ensures that the employee can manage the chemical safely without compromising the important communication about hazards, as the employee retains direct knowledge and responsibility for the safety of that chemical. Proper training and awareness about the chemical's properties and hazards are foundational aspects of this exception.

The other options suggest scenarios that do not provide a valid basis for forgoing labeling requirements. Storing containers in cabinets, frequency of use, or the toxicity of the chemical do not address the need for labeling to ensure that all employees are adequately informed about the hazards associated with chemicals used in the workplace.