To guarantee both safety and performance in aviation, specifications have been established for jet fuel. The American Society for Testing and Materials(ASTM) and the UK Defence Standard (Defstan) are the main organizations worldwide that develop these standards. The two main aviation turbine fuel specifications used in many areas of the world for commercial aviation are ASTM D1655 and DEFSTAN 91-91. These specifications set certain limits to for instance the freezing point, the flash point and the density of the fuel.

Because of the very strict safety standards in the aviation industry, new fuels (like sustainable jet fuels) need to be approved as safe and appropriate for commercial use. Over the last 10 years the aviation industry and ASTM worked closely together on the creation of a new standard for sustainable jet fuel. This has resulted in the ASTM D7566 specification, which handles jet fuels containing synthetic hydrocarbons.

Before the HEFA jet fuel can be blended with fossil jet fuel, the HEFA Jet fuel must first be analyzed and certified to meet this ASTM D7566 specification. SkyNRG uses independent testing companies to perform these analyses in order to certify the HEFA Jet fuel. The testing company samples the tank and performs the required tests in their laboratory. If the HEFA Jet fuel meets the specification, a Certificate of Quality is issued, showing conformity to the ASTM D7566 specification.

Once the HEFA jet Fuel is blended with fossil jet fuel, the sustainable jet fuel blend is analyzed again. If the HEFA Jet fuel meets the specifications, the sustainable jet fuel blend is recertified to ASTM D1655 spec for standard fossil jet fuel. By re-certifying the bio-jet fuel to a standard fuel, no documents or procedures in the following supply chain steps need to be adjusted. The fuel can use all existing infrastructure.

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Jet fuel specifications – click to enlarge