, stress tests were carried out, which showed that the hydrogen does not damage the components and that these are suitable for hydrogen. This logo indicates the product status "H2ready tested" on the following [...] pages: The new "H2ready tested" certification certifies the suitability for hydrogen-natural gas mixtures in any volume ratio – from 100% natural gas to 100% hydrogen. The test mark certificates were issued [...] issued by the DBI test labo- ratory in Freiberg, a recognized test laboratory of the DVGW. They confirm the suitability of the products for use in hydrogen applications in the public gas supply. 12 The