Home > Tribometers > Applications > ASTM D6078-04 | Lubricity of Diesel Fuels by the Scuffing Load Ball-on-Cylinder Lubricity Evaluator

ASTM D6078-04

Lubricity of Diesel Fuels by the Scaffing Load Ball-on-Cylinder Lubricity Evaluator

SLBOCLE

Evaluate the lubricity (load carrying ability) of diesel fuels using a scuffing load ball-on-cylinder lubricity evaluator (SLBOCLE).

Summary of the ASTM D6078-04 Standard Method

This test method evaluates the lubricity (load carrying ability) of diesel fuels using a multi-functional tribometer MFT 5000.

In this test method the lubricity of a fluid is evaluated by the minimum applied load in grams that, at any time during the test, will produce a friction coefficient greater than 0.175 between a stationary ball and a fluid-wetted rotating ring operating under defined conditions.

Applications

This test method is applicable to middle distillate fuels, such as Grades Low Sulfur No. 1 D, Low Sulfur No. 2 D, No. 1 D, and No. 2 D diesel fuels, in accordance with specification D975; and other similar petroleum-based fuels which can be used in diesel engines.

It is not known that this test method will predict the performance of all additive/fuel combinations.

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Lubricity of Diesel Fuels Test Parameters

Balls:	Chrome alloy steel, made from AISI standard steel No. E-52100, with a diameter of 12.7 mm, Grade 5 to 10. EP finish Carburized steel, having a Rockwell Hardness C Scale Number of 58 to 62
Ring:	SAE 8720 steel, having HRC number of 58 to 62
Force:	linear increasing (range 500 g to 5000 g)
Test Duration:	Until COF crosses 0.175
Speed:	525 rpm
Temperature:	Ambiant -25 °C
Humidity:	50%
Lubrication:	Lubricating Liquid
Data:	Normal Force (Fz) Friction (Fx) Coefficient of Friction Humidity (RH)

Lubricity of Diesel Fuel Data Summary

ASTM D6078-04 test results are reported below. The load at which the COF crosses 0.175 is reported along with the wear scar diameter in the final report.