http://www.cdc.gov/niosh/npg/

This Guide is intended as a source of general industrial hygiene information for workers,employers, and occupational health professionals, and presents key information and data in abbreviated tabular form for 677 chemicals or substance groupings (e.g., manganese compounds, tellurium compounds, inorganic tin compounds, etc.) that are found in the work environment. The industrial hygieneinformation found in this Guide should help users recognize and control occupational chemical hazards.