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TrusTec® PRF Octane Blend No. 90 is a primary reference fuel with 90% isooctane and 10% n-heptane for determining octane rating.
TrusTec® PRF Octane Blend No. 90 pimary reference fuel meets the requirements outlined in ASTM D-2699 and ASTM D-2700 for octane testing. TrusTec® PRF Octane Blend No. 90 is composed of 90% isooctane and 10% n-heptane.
Specific Gravity at 60/60 °F : 0.6960 – 0.6970
Composition, vol %
Isooctane : 89.70 – 90.30
n -Heptane : 9.70 – 10.30
Erratic or Inconsistent Octane Level in Standard Fuel
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