You must register in order to access the MeClas tool and all supporting information. A short description of the Terms of conditions can be downloaded. The manual gives an idea on the basic functionalities of MeClas.



7 May 2018: This MeClas version 4.5 is currently the old version (will only temporarily remain available). You are recommended to use the new MeClas version 5.0 (available later this week). In case of questions or issues, don’t hesitate to contact

Username: Password:
register / forgot password?

The MECLAS tool allows classifying complex inorganic materials like ores and concentrates, complex intermediates, alloys or UVCBs, recognizing the specific properties and assessment techniques for inorganics, using the most updated information on toxicity references and self classifications available.


MeClas is built on a limited number of simple and basic principles:


MeClas rules

MeClas is governed by the following rules. All license holders of the model shall agree with these principles when buying license rights to the MeClas tool:


Meclas Infogram

MECLAS | Create infographics