The OECD Harmonised Templates (OHTs) are standard data formats for reporting information used for the risk assessment of chemicals, mainly studies done on chemicals to determine their properties or effects on human health and the environment, but also for storing data on use and exposure. They are aimed at developers of database systems, as they prescribe the formats by which information can be entered into and maintained in a database. By using these templates, governments and industry are easily able to electronically exchange test study summary information.

The templates can be used to report summary test results for any type of chemical (e.g., pesticides, biocides, industrial chemicals, food/feed additives). The OECD Harmonised Templates cover endpoints and reporting elements which are grouped as follows:

Physico-chemical properties (incl. nanomaterials) - OHTs 1 to 23-5 & 101 to 113
Environmental fate and behaviour  - OHTs 24 to 40 & 401
Effects on biotic systems - OHTs 41 to 57
Health effects - OHTs 58 to 84 & 86
Pesticide residue chemistry - OHTs 85-1 to 85-10
Analytical methods - OHT 87
Efficacy - OHTs 88 & 89
Emissions from treated articles - OHT 90
Intermediate effects - OHT 201
Use and exposure information - OHTs 301 to 306
Generic elements for all OHTs

- Literature reference - Test material information                        - Reference substance - Chemical inventory

Each Template is accessible online in readable format (.doc file), with associated html schema (.xsd file), and with predefined tables and executive summaries (.html files) as available. The links to corresponding OECD Test Guidelines are given where applicable. 

All OHT materials can also be downloaded at once from a single zip file which collates the 130 OECD Harmonised Templates and their related materials. 

For more information and technical details on Templates see : IntroductionFormat and conventions used


Twenty-three revised Templates now available online (January 2021)

Two OECD Harmonised Templates for Reporting Chemical Test Summaries (OHTs 3 and 14) from the series on Physico-Chemical Properties; four Templates (OHTs 29, 30, 37 and 39) from the series on Environmental Fate and Behaviour; six Templates OHTs 41, 43, 45, 46, 50-2 and 53) from the series on Effects on Biotic Systems; seven Templates (OHTs 60, 61, 62, 67, 70, 73 and 74) from the series on Health Effects; one Template (OHT 85-5) from the series on Pesticide Residue Chemistry; one Template (OHT 87) on Analytical Methods; one Template (OHT 90) on Emissions from Treated Articles and one Template (301) from the series on Use and Exposure Information, were updated for alignment with IUCLID 6.5 characteristics.

Two revised Templates (OHTs 66-1 and 201) now available online (December 2020)

One OECD Harmonised Templates for Reporting Chemical Test Summaries (OHT 66-1) from the series on Health Effects, and one Template (OHT 201) on Intermediate Effects - Mechanistic Information were updated aiming to include revised and new OECD Test Guidelines issued in 2019 or in previous years.