Asia jet fuel/kerosene remains king of the barrel as ... - S&P Global
Asia jet fuel/kerosene remains king of the barrel as swing barrels weigh on outlook
www.spglobal.comHere’s the latest on what octane means for jet fuel and where the conversation stands.
Answer
- Jet fuel is not described by octane ratings like gasoline. Instead, jet fuels (including Jet A, Jet A-1) are rated by freezing point, energy content, and other specifications, with octane not being a relevant metric for turbine engines. This distinction has been highlighted in recent industry discussions about alternative jet fuels and refining blends.[4][6]
Key points
- Octane concept: Octane ratings apply to spark-ignition internal combustion engines (gasoline) to indicate resistance to knocking. Jet turbines are compression-ignition-like in behavior and rely on continuous combustion of kerosene-based fuels, so octane is not a governing spec for jet fuel performance. This is a standard industry distinction discussed in fuel references and market analyses.[5][6]
- Jet fuel specs: The important jet-fuel specs include freeze point, flash point, density, viscosity, sulfur content, and energy content (Btu/kg). Jet A-1 is the common civilian standard, with emphasis on low freezing point and high energy density.[4]
- Market and blends: There is ongoing industry interest in sustainable aviation fuels (SAF) and synthetic fuels, where feedstocks and pathways matter more than octane ratings for end-use compatibility. Some recent industry announcements show commercial-scale SAF production using ethanol-to-jet (ATJ) and other pathways, which are designed to meet existing jet fuel specs rather than octane criteria.[1]
- Military fuels note: For reference, military aviation uses JP-8, a kerosene-based fuel with additives for performance in extreme conditions; octane ratings are not the determining factor for JP-8 either. This illustrates how aviation fuels operate on different performance criteria than gasoline octane.[3]
Illustration
- If you’re evaluating fuel options for an aircraft, focus on the specification sheet: freezing point, viscosity, energy content, and compatibility with the engine and turbomachinery, rather than octane numbers. An example is SAF pathways like Alcohol-to-Jet (ATJ) which are designed to meet current Jet A-1 specs at scale.[1]
Would you like a concise glossary differentiating octane vs. jet-fuel specs, or a quick overview of current SAF pathways and their key specs? I can also pull a short, up-to-date summary from industry sources if you want.[1][4]