According to OSHA chemical container communication standards, what must be done with containers overnight?

Under OSHA's chemical container communication standards, it is essential to ensure that all chemical containers are properly labeled, even if they are only partially filled. When containers are left overnight, the potential for accidents, leaks, or exposure increases significantly if they are unlabeled or left open. By requiring that containers must not be left unlabeled or partially filled, OSHA aims to mitigate risks associated with hazardous chemicals, ensuring that employees are aware of the contents and any associated dangers, thus maintaining a safer work environment. Proper labeling enables immediate identification of the chemical, which is critical for emergency responses and safe handling, particularly when the materials must be stored or accessed by multiple personnel.