Water by Coulometric KF

Water contamination can cause serious operating problems in normal spark-ignition engines. Water contamination is typically encountered during fuel transportation and storage. Additionally, gasoline-ethanol blends tend to absorb moisture from the air. For these reasons, it is important to limit the water concentration of the ethanol intended for blending in order to reduce the risk of phase separation. ASTM D4806 Requirement: a maximum of 1.0% by volume.