Particularly Hazardous Substances (PHS)
The OSHA Laboratory Standard specifies that special precautions be taken when Particularly Hazardous Substances (PHS) are used in the laboratory. At Carnegie Mellon, we require the preparation of a written procedure for the use and handling of a PHS in a laboratory. This should be prepared using the PHS Protocol/Procedure Form developed by the Laboratory Safety Committee. A copy of this procedure must be supplied to EH&S. To help you identify PHS materials in your laboratory, read the applicable section of the Chemical Hygiene Plan, and refer to the PHS Listing provided.