1. Why does eChemPortal exist?
  2. What information is available in the database?
  3. How are the participating data sources selected?
  4. Can I trust the data found via eChemPortal?
  5. How is the data in eChemPortal maintained?
  6. How does the search function work?
  7. Why can I not find the substance I am looking for in a search on specific chemical endpoint properties?
  8. Why, in the "Check" column of a substance search results table, do I not see any boxes to check in order to proceed to a property search?
  9. Does eChemPortal use the OECD Harmonised Templates?
  10. To whom can I send questions about the database?
  11. Can I search eChemPortal by chemical structure?



1. eChemPortal was created as a step towards achieving long-standing international commitments to identify and make information on chemical properties publicly available. See General Information on the Portal.


2. eChemPortal makes available web links to information on properties of chemicals (physical chemical properties, environmental fate and behaviour, ecotoxicity, toxicity) submitted to government chemical review programmes at national, regional, and international levels as well as web links to national/regional classification results according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). eChemPortal also provides descriptions of the sources and quality of data on the pages describing each participating data source.


3. In general, eChemPortal focuses on information submitted to government chemical review programmes. Proposals for linking new sources of data to eChemPortal can be made by any stakeholder represented at the OECD Joint Meeting of the Chemicals Committee and the Working Party on Chemicals, Pesticides and Biotechnology. The decision to accept a proposal is taken by the OECD Task Force on Hazard Assessment. OECD actively encourages additional participation; please contact the OECD Secretariat if you have any questions on how to make a proposal.


4. The data and information stored in each participating data source are the responsibility of the data owner. OECD cannot guarantee the correctness of the data. eChemPortal does provide descriptions of the sources and the peer review the data has undergone on the pages describing each participating data source.


5. Different data sources in eChemPortal use different methods to maintain their data in eChemPortal. The methods vary from an automatic update via the Internet, semi-automatic update via the Internet, to a manual import of data files, depending on participating data source resources and the frequency of updates. Users may also wish to consult the individual participating data sources if they need to be assured that they have the most up-to-date information.


6. In order for you to retrieve web links for a specific chemical, eChemPortal stores chemical names, and numbers and associated URLs submitted periodically by participating data sources. Some data sources also submit a selection of endpoint property data to allow searches that retrieve links to the full datasets in participating data sources. See the search help for more information.


7. and 8. Not all data sources can be searched through the property search. Some participating data sources have submitted to eChemPortal only information on substance identification and web links to information/documents on their local systems because they did not have the capacity to provide property data (For example, their information exists in a PDF document and not in a database format.). See the list of data sources that have submitted property data to be queried.

If you are interested in property data for a specific chemical, do a substance search on that chemical to obtain all the information on that chemical available through eChemPortal.

If you are interested in a specific property value, do a property search. You may then want to do a substance search on the substances found through the property search, by clicking on the substance name in the results lists.


9. eChemPortal stores endpoint property data in the OECD Harmonised Templates format. The templates prescribe the formats by which information for reporting a summary of the results of a test on a chemical to determine its properties or effects on human health and the environment can be entered into and maintained in databases. Participating data sources which also store data in this format can more easily maintain their data in eChemPortal.


10. You may send the OECD Secretariat questions about the database by using the eChemPortal’s Contact Form.


11. In order to find information via eChemPortal for a chemical substance whose chemical name is unknown or to find information on chemical substances with a similar structure to a specific chemical, the OECD QSAR Toolbox may used.



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