Working alone with hazardous materials or hazardous processes is discouraged.  However, when necessary, the following rules apply:

• The work hours must be approved, in writing, by the lab manager or PI
• The person working alone shall make arrangements with other persons in the building to check with each other periodically.
• Dangerous experiments such as, but not limited to, working with pyrophoric, explosive, or highly toxic materials shall not be performed by a worker who is alone in the lab (see Working with Highly Hazardous Materials)