This article is from the Chemistry FAQ, by Bruce Hamilton B.Hamilton@irl.cri.nz with numerous contributions by others.
http://hazard.com/msds/
http://haz1.siri.org/
The comprehensive Vermont SIRI location is an excellent first port of
call when searching for chemical safety information.
http://chemfinder.camsoft.com/
CambridgeSoft Corporation's Chemfinder free searching server will
also locate safety information on chemicals, including MSDS.
http://www.atsdr.cdc.gov/atsdrhome.html
The Agency for Toxic Substances and Disease Registry (ATSDR) at the
Centers for Disease Control maintains a searchable database which
contains toxicological profiles of about 200 chemicals.
Note that many government departments now have made their databases
available to both commercial database suppliers ( such as Knight Ridder )
and private citizens. Some are free, and some charge, it is worth contacting
government agencies like OSHA, NIOSH, EPA, NIH and asking about what is
available. Some databases ( like NIH library ) can be accessed via telnet,
as also can Dialog ( once you have an account number ). eg
http://www.ncbi.nlm.nih.gov/PubMed/medline.html
Medline, a medical database maintained by the NIH
telnet://Dialog.com
 
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