Official links
Direct links to the primary regulatory, toxicological and transport sources referenced throughout this site. Only government agencies, international bodies and long-standing scientific organisations are listed. No affiliate or commercial links.
Chemical databases
Structured data on individual substances: identity, properties, hazards, toxicology.
PubChem
USNIH / NLM · pubchem.ncbi.nlm.nih.gov
Largest open chemistry database. Structures, properties, hazards, PubMed links. Source of most data on this site.
ChemIDplus
USNLM · nlm.nih.gov
Historical NLM identifier and toxicology index, now merged into PubChem.
ECHA CHEM
EUECHA · chem.echa.europa.eu
European Chemicals Agency portal. REACH registrations, CLP classifications, biocides, restrictions.
eChemPortal
Intl.OECD · echemportal.org
Global search across dozens of national chemical databases (EU, US, Japan, Australia, Canada).
GESTIS Substance Database
DEIFA · gestis-database.dguv.de
German trade association database. Excellent SDS-style summaries in English and German.
CAS Common Chemistry
USACS / CAS · commonchemistry.cas.org
Free lookup for CAS numbers and IUPAC names for ~500,000 substances.
ChemSpider
UKRSC · chemspider.com
Royal Society of Chemistry structure search across 100+ data sources.
Occupational health & exposure limits
TWA, STEL, IDLH, PEL and workplace safety guidance.
OSHA Chemical Database
USOSHA · osha.gov
Official US Permissible Exposure Limits (PEL) and workplace chemical fact sheets.
NIOSH Pocket Guide
USNIOSH / CDC · cdc.gov
Pocket guide to 677 chemical hazards. IDLH, RELs, symptoms, first aid, PPE.
NIOSH IDLH values
USNIOSH · cdc.gov
Complete list of Immediately Dangerous to Life or Health airborne concentrations.
ACGIH TLVs & BEIs
USACGIH · acgih.org
Threshold Limit Values and Biological Exposure Indices. Reference for most industrial hygiene programs.
INRS FicheTox
FRINRS · inrs.fr
French toxicological fact sheets. Detailed metabolism and exposure data (in French).
HSE UK EH40
UKHSE · hse.gov.uk
UK Workplace Exposure Limits (WELs) as published in EH40/2005.
Regulations & classification
Legal frameworks that govern how chemicals are classified, labelled and reported.
UN GHS (Purple Book)
Intl.UNECE · unece.org
Globally Harmonised System of Classification and Labelling of Chemicals. Current: Rev. 10 (2023).
OSHA HazCom 2012 (29 CFR 1910.1200)
USOSHA · osha.gov
US Hazard Communication Standard: SDS format, GHS labels, worker training requirements.
EU CLP Regulation
EUEUR-Lex · eur-lex.europa.eu
Regulation (EC) 1272/2008 on Classification, Labelling and Packaging. EU implementation of GHS.
EU REACH Regulation
EUEUR-Lex · eur-lex.europa.eu
Regulation (EC) 1907/2006 on Registration, Evaluation, Authorisation and Restriction of Chemicals.
ECHA C&L Inventory
EUECHA · echa.europa.eu
Notified and harmonised classifications for every substance placed on the EU market.
Health Canada WHMIS
CAHealth Canada · canada.ca
Workplace Hazardous Materials Information System, aligned with GHS.
Dangerous goods transport
Rules for road, rail, sea and air shipment of hazardous materials.
ADR 2025
EUUNECE · unece.org
European Agreement concerning the International Carriage of Dangerous Goods by Road.
US DOT 49 CFR (PHMSA)
USDOT / PHMSA · phmsa.dot.gov
US Hazardous Materials Regulations (HMR) governing all domestic hazmat transport.
IATA Dangerous Goods Regulations
Intl.IATA · iata.org
Air transport rules for shippers, forwarders and airlines.
IMO IMDG Code
Intl.IMO · imo.org
International Maritime Dangerous Goods Code for sea shipment.
UN Model Regulations (Orange Book)
Intl.UNECE · unece.org
Recommendations on the Transport of Dangerous Goods. Basis for ADR, IMDG and IATA.
Toxicology & carcinogenicity
Authoritative sources for LD50, LC50, carcinogen classifications and health effects.
IARC Monographs
Intl.IARC / WHO · monographs.iarc.who.int
Peer-reviewed evaluations of cancer risk. Group 1, 2A, 2B, 3, 4 classifications.
ATSDR ToxProfiles
USATSDR / CDC · atsdr.cdc.gov
Detailed toxicological profiles for priority hazardous substances.
US EPA IRIS
USUS EPA · epa.gov
Integrated Risk Information System. Reference doses and cancer slope factors.
TOXNET (archived)
USNLM · nlm.nih.gov
Legacy toxicology network. HSDB, ChemIDplus and TOXLINE content migrated to PubChem.
OECD eChemPortal HPV
Intl.OECD · hpvchemicals.oecd.org
High Production Volume chemicals dossiers with tox and ecotox endpoints.
Emergency response
Contacts and guides for spills, exposures and poisonings.
US Poison Control
USAAPCC · poison.org
Call 1-800-222-1222 in the US. Online triage tool webPOISONCONTROL also available.
CHEMTREC
USACC · chemtrec.com
24/7 hazmat emergency response hotline. Call 1-800-424-9300 (US) / +1-703-741-5970 (intl.).
ERG (Emergency Response Guidebook)
USDOT / PHMSA · phmsa.dot.gov
Free guide used by first responders during the initial phase of a hazmat incident.
EU Poison Centres notifications
EUECHA · poisoncentres.echa.europa.eu
UFI codes and harmonised information required from mixture importers under CLP Annex VIII.
Antipoison France
FRMinistère Santé · centres-antipoison.net
Réseau des centres antipoison français. Call 15 (SAMU) in emergencies.
National agencies
Country-specific regulators for chemical safety.
OSHA
USUS DOL · osha.gov
Occupational Safety and Health Administration.
NIOSH
USCDC · cdc.gov
National Institute for Occupational Safety and Health.
US EPA
USEPA · epa.gov
Environmental Protection Agency. TSCA inventory and chemical risk evaluations.
ECHA
EUEU · echa.europa.eu
European Chemicals Agency.
ANSES
FRMinistère Santé · anses.fr
Agence nationale française de sécurité sanitaire.
INRS
FRSécurité sociale · inrs.fr
Institut national de recherche et de sécurité au travail.
HSE
UKUK Gov · hse.gov.uk
Health and Safety Executive.
BAuA
DEBMAS · baua.de
German Federal Institute for Occupational Safety and Health.
Safe Work Australia
AUAustralian Gov · safeworkaustralia.gov.au
Model WHS laws and workplace exposure standards.
Results are indicative and for educational use. Verify against your institution's protocols and the manufacturer's SDS before any real-world use. Not valid as a regulatory label. Terms of use.