Lubricants Quality Check Part 4: 4 Ball Scar Test

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A variation of the 4 Ball Weld Load Test, the 4 Ball Scar Test, aims to determine the wear reduction properties of lubricants and greases.  The configuration of the 4 steel balls and lubricant (or grease) is the same as with the Weld Load test, but the load applied on the top ball is fixed at only 40 kgs., for 1 hour.   Welding is not a typical occurrence in this test, yet a ‘scar’ is typically manifested on the steel balls after the test.

The scar diameter is measured in mm., and the values resulting from the tests of different lubricants may be compared to provide guidance on wear-reduction properties.

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