1.1 This specification covers biodiesel (B100) Grades S15 and S500 for use as a blend component with middle distillate fuels. 1.2 This specification prescribes the required properties of diesel fuels at the time and p This specification covers biodiesel fuel blend stock, B100, in Grades S15 and S500 for use as a blend component with middle distillate fuels. This specification prescribes the required properties of diesel fuels at the time and place of delivery. The r