Seta-Shell Four Ball Autoload Lubricant Tester for ASTM D, ASTM D, IP We perform grease testing by ASTM D to measure the load-carrying properties or load wear index of lubricating grease using a four ball test apparatus. This standard is issued under the fixed designation D ; the number 1 This method is under the jurisdiction of ASTM Committee D02 on Petroleum.

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About the Author John Kurosky. The lithium complex grease, sample No. If incompatibility occurs, failure would be found in any of the tests of a given specification requiring no other testing; however, a borderline compatible reading requires additional application testing for conformance to the extreme temperatures and excessive pressure conditions of a given grease application.

Grease Sampling Methods Matter. Make sure to use a valid business email address.

Maximizing Grease Performance Through Optimal Compatibility

The equation combines several ASTM test methods and properties that best represent performance. How do you know if the grease you are using is right to protect against harsh environments AND routine operating wear.

Taking this precautionary measure assures reliability and performance of equipment. The s2596 are in a few ASTM test methods. For this experiment, a low-level, 10 percent by weight, of contamination was implemented to avoid harmful degradation of the individual greases and to simulate a situation common to typical grease changeouts. A graphic representation showing the dramatic difference in load-carrying capability between two grease samples sample No.

Three measurements go into determining the LWI. Determines the strenghth of the boundary film between metal surfaces that provides extended protection. Table 2 presents a selection of data points showing how low-level contamination by water and a lesser performing grease resulted in a reduction in performance of a higher performing product.


Determines the load-carrying properties of lubricating greases by measuring scaring on a test specimen. Maintenance Services and Products. Innovative data and testing tools aid the decision process through the analysis of two or more co-mingled greases. Understanding compatibility and contamination is asmt first step astk optimal grease performance, plant operations and return on investment.

Scar size is measured on a test specimen. Simply put, all the grease samples were found to be compatible with one another. The better the lubricant is at preventing wear, the smaller the wear scar will be on the three stationary balls.

The lower the mm, the more protection a grease provides.

The result is metal-to-metal contact, premature wear and increased heat. It is best to both increase the frequency and reduce the volume. For a FREE grease assessment Although these results do not necessarily correlate with real life applications, the method has become an industry standard in comparing EP, wear and frictional functionality.

Because percent grease replacement is unlikely, some level of contamination is certain to occur, requiring the pre-implementation measurement of leftover grease with a new product before finalizing xstm upgrade or machinery process change. More often than not, intermixed grease analysis shows minimal changes in grease performance, but this cannot be taken as the rule without proper assessment.

The supplier should also spend time with maintenance personnel to make sure they know what to look for going forward. A Testing Example An overview of a recently performed aviation grease study by Anderol demonstrates the necessity of proper grease testing within ast actual manufacturing environment. The final determination of compatibility comes with proper testing of greases in the application for key performance properties.

Create your own user feedback survey. For study purposes, two greases sample No. Welding can be detected if any of the following are noticed:.

  ISO 15930-1 PDF

The Best Gets Better: Result values and what they mean: The dilution in performance is again nearly equivalent to the level of contamination, that is a 20 percent reduction in the load wear index upon 20 percent contamination. Wear scar properties and coefficient of friction of a lubricating grease can also be determined using the 4 F2596 Wear configuration.

This becomes important when maintenance teams are trying to reduce the number of greases that are being purchased. A critical part of this assessment is working with a lubricant supplier with the specific industry know-how, and the proper testing procedures in place to ensure maximum grease compatibility and performance, promoting business success and profitability. An incompatibility issue could be reflected in reduced lubricating performance due to the modified composition of the fluids and additives from intermixing.

Mud, water and steam can wash away grease, leaving metal unprotected. Incompatibility can be identified from the performance or measured physical properties of two or more mixed greases.

Tribological Testing by 4 Ball Methods

The lower the number, the less likely the grease will oxidize and the longer it will last on the shelf. Before implementing a new product, plant and maintenance engineers must weigh all consequences of grease intermixing and the impact on equipment reliability, production levels and the bottom line.

Regardless of the manufacturing industry – be it food processing, mining, power generation or aviation – plant managers and engineers need to work hand-in-hand with a supplier employing highly trained professionals with expertise in industrial lubricants and applications to ensure compatibility. Dropping point ASTM test: What the test measures: