1. Does the substance have a harmonized classification?
The harmonized classification of a substance can be found on the websiteECHA-CHEM using the following information: its main identification numbers (CAS No., EC No., index No.) and its chemical name.
To find your way to the search engine, follow the step-by-step instructions in the ECHA-CHEM Site Guide at
There are general entries in Annex VI (e.g., “tributyltin compounds”) that will not be identified...
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Does the substance have a harmonized classification?
What is a harmonized substance?
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