As SAF blending ratios continue to increase, understanding the changing characteristics of conventional jet fuel is becoming just as important as the development of new synthetic pathways. In this new white paper, Intertek expert Liam Mills explores how shifting fuel properties, including aromatics, density, and kinematic viscosity, could impact future SAF blending strategies and specification compliance. Drawing on both industry data and Intertek’s own 2025 SAF blending studies, the paper highlights emerging technical considerations that producers, traders, airports, and airlines will need to navigate as the aviation sector accelerates toward lower-carbon fuels.