Airbus and Rolls Royce recently announced that they were testing 100% sustainable aviation fuels in flights. These flights will test the impact of 100% SAF on operability and emissions.Current ASTM D7566 certification allows the use of SAF in blends of 50% for most technology pathways, including HEFA, Fischer-Tropsch and alcohol-to-jet.One of the major reasons for only allowing 50% blends is due to the lack of aromatics in the SAF produced through these pathways. A minimum of ~8% aromatics is required in jet fuel, up to a maximum of ~25%, as the elastomer seals in aircraft and engines need...

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