H-sentences indicate hazard statements. The "H" stands for "Hazard" here. These designations conform to the GHS system. An overview is included in the menu Links> Settings> Substance> Texts.

This list has been made public via the European Commission's website (Europese Commissie). See also the website of the European laws and regulations concerning REACH.

Some H-sentences have a CMR or CMR-suspect indication. This information is used to automatically check the corresponding boxes for a substance when such an H-sentence is linked. After that moment, the indication for the substance can no longer be modified.