Reference links
Chemical databases
Good starting points when you need to verify names, CAS numbers, structures or basic substance data.
PubChemCompound names, identifiers, structures and public chemistry records.
NIST Chemistry WebBookPhysical property data, spectra and thermochemical references.
ChemSpiderStructure search and cross-references for chemical identifiers.
WebElementsPeriodic table data and element reference information.
Safety and regulatory references
Useful external sources for regulatory checks, environmental data and Swedish chemical guidance.
ECHA Information on ChemicalsEuropean substance information, classifications and regulatory context.
Swedish Chemicals AgencyGuidance from Kemikalieinspektionen for chemicals in Sweden.
Swedish Work Environment AuthorityInformation about permits and restrictions for certain hazardous substances.
ECOTOX KnowledgebaseEnvironmental toxicity data from the U.S. EPA.
Tools and terminology
Quick references for calculations, terminology and common chemistry checks.