There are many chemicals that people work with everyday, but there have not been standards set or revised since 1971. In an effort to reduce chemical exposures in the workplace, OSHA recently released the OSHA Occupational Chemical Database it's "premier one-stop shop for occupational chemical information."
This database has complied information from several government agencies and organizations. You can search for chemicals by name or identification number, learn the permissible exposure limits (PEL's) for specific chemicals, and additional resources for each substance.