B6 to B20 Blends

The specification for B6 to B20 blends requires that the biodiesel meet the D6751 specification prior to blending with diesel fuel. The general requirements of the B6-B20 specification, D7467-15cε1, are shown in Table 5. Beyond the properties in Table 5, there are many other requirements within the specification that are important for users. Consult the full specification for additional details (available at astm.org). The requirements are based on those in D975 with some additional requirements to ensure the fuel is fit-for-purpose. The 90% distillation temperature is allowed to be 5°C higher than for D975 diesel fuel. The specification is designed such that if a D6751-compliant B100 and a D975-compliant diesel fuel are blended, the resultant blend will meet the specification. However, diesel fuel that does not fully meet D975 can also be used (for example by having inadequate lubricity, high sulfur, or high aromatics), and biodiesel can be used to blend these properties into compliance.