Visit the U.S. Department of Energy's Chemical Safety Program to search for safety articles on various chemicals and lab materials.
http://www.osha-slc.gov/OshStd_toc/OSHA_Std_toc_1910.html

The MSDS FAQ will supply you with background information on how to use Material Safety Data Sheets and answer frequently asked questions on the regulations and instructional uses of chemicals.
http://www.ilpi.com/msds/faq/index.html

Search this Cornell University site and pull up over 250,000 different Material Safety Data Sheets. You will be introduced to data on chemical ingredients, health and fire hazards, reactivity, disposal requirements and precautions for use.
http://msds.pdc.cornell.edu/msdssrch.asp