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Annex 16 Vol IV defines a conversion process as "a type of technology used to convert a feedstock into aviation fuel".
As of October 2021, 9 conversion processes for SAF production have been approved by the ASTM International. In order to be used in commercial flights, a sustainable aviation fuel (SAF) has to comply with ASTM D4054.
In order to be eligible for use within the ICAO Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA), SAF must also meet a set of sustainability criteria. More information on CORSIA eligible fuels is available on the dedicated CORSIA Eligible Fuels webpage.
Specific details on the conversion processes that already have CORSIA default Life Cycle Emission values (FT, HEFA, SIP and ATJ) are available in the CORSIA supporting document "LCA methodologies"
co-hydroprocessing of esters and fatty acids in a conventional petroleum refinery