HFRR Test (High Frequency Reciprocating Rig)
The HFRR test is the standard laboratory method for measuring diesel fuel lubricity. It measures the wear scar diameter (in microns) left by a steel ball oscillating against a steel plate submerged in...
Grant Taylor
Fleet Solutions Director, Fuel Ox
What Is HFRR Test?
The HFRR test is the standard laboratory method for measuring diesel fuel lubricity. It measures the wear scar diameter (in microns) left by a steel ball oscillating against a steel plate submerged in fuel. A smaller wear scar means better lubricity. The ASTM D6079 standard requires a wear scar of 520 microns or less. Quality lubricity additives like Fuel Ox can reduce wear scars to 300-400 microns, significantly extending fuel system life.
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