Hydrotreated vegetable oil (HVO) for bio diesel and sustainable aviation fuels (SAF) are regarded as a promising alternative to reduce the use of fossil fuels and lower greenhouse gas emissions. Silica is an effective processing aid in the pre-treatment of HVO feedstock, such as used cooking oils, sewage sludge and other organic materials. These must be purified before hydrogenation to remove phosphorus lipids, chlorides or metals. Efficient and sustainable pretreatment of HVO feedstocks is crucial for the quality of biobased fuels. It contributes to disruption-free processing, extends the service life of the system, protects HVO catalysts and increases their life span. Thanks to their highly porous structure and high surface area, SIPERNAT® special silica grades are excellent and highly efficient absorbers of impurities, guaranteeing smooth processing of the pretreated feedstocks.