Databases for chemicals, research for formula, ...

Chemistry by NIST (database access): www.nist.gov
... see section Chemistry Web Book
Innovadex (data sheets, MSDS, formulation): www.innovadex.com
European CHemicals Agency: ECHA
LookChem.com: www.lookchem.com
ChemicalBook.com: www.chemicalbook.com
Environmental website: www.environmentalchemistry.com
SpecialChem4Polymers.com: www.specialchem4polymers.com

Chemical Societies, Academic websites, Institutionals ...

Société Chimique de France: www.societechimiquedefrance.fr
L'Union des Industries Chimiques (UIC): www.uic.fr
L’Institut National de l’EnviRonnement Industriel et des RisqueS : www.ineris.fr
CNRS Chimie: www.cnrs.fr/chimie
Institut National de Recherche et de Sécurité (INRS): www.inrs.fr
American Chemical Society: www.acs.org
Royal Society of Chemistry: www.rsc.org
Society of Chemical Industry: www.soci.org
International Union of Pure and Applied Chemistry (IUPAC) : www.iupac.org
Chemical Abstract Service (CAS) : www.cas.org
Links for chemists on the virtual library of The University of Liverpool : www.liv.ac.uk