Biodiesel Blends

B100:  Biodiesel in its purest form is known as B100.  Its chemical and physical properties are similar to petroleum-based diesel and, in some cases, can be used in existing diesel applications with little or no modification to the engine or fueling system. 

B100 is a good solvent, freezes at higher temperatures than most conventional diesel fuel, and is not compatible with some hoses, gaskets, metals, and plastics.  Therefore, B100 primarily serves as the blend stock for lower blends, such as B5 and B20.   Any biodiesel used for blending should meet ASTM D6751 quality specifications prior to blending.

B20:  A blend of 20% biodiesel and 80% petroleum diesel is known as B20.  B20 has properties similar to conventional diesel fuel.  B20 is popular because it represents a good balance of cost savings, emissions reductions, cold weather performance, materials compatibility, excellent lubricity, and petroleum displacement.

B2 and B5:  Blends of 2% biodiesel and 98% petroleum diesel and 5% biodiesel and 95% petroleum diesel, available at many Iowa retail locations, have virtually the same properties as No. 2 diesel.  These low blend levels enhance the lubricity of diesel fuel and reduce engine wear and operating temperature. Many users credit low biodiesel blends with increasing fuel economy and extending engine life.