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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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D What the test measures: The higher the number, the greater the long-term protection. In addition, where possible the supplier should be present throughout a grease changeout to make sure the new grease runs correctly. Result values and what they mean: Determines the load-carrying properties of lubricating greases by measuring scaring on a test specimen. Maintenance and engineering personnel can minimize the risk associated with grease changes by doing each of the following: Innovative data and testing tools aid the decision process through the analysis of two or more co-mingled greases.

In this example, a recent three-test trial of intermixed lithium soap-thickened greases reveals details of compatibility when observing grease consistency, antiwear and extreme pressure along with water contamination on extreme pressure grease performance.

Tribological Testing by 4 Ball Methods

ast In the next issue, we will describe how wear scars from the various tribological tests are measured two dimensionally using optical microscopes and three dimensionally using profilometry. With satm elements in place, asm will enjoy improved operating efficiency, increased machine life and an overall cost effectiveness. 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.

Incompatibility can be identified from the performance or measured physical properties of asfm or more mixed greases. Ideally, a supplier with an intensive research and development program is willing to perform tests before a lubrication change is implemented to protect machinery from failure or wear. Maintenance and engineering personnel can minimize the risk associated with 2d596 changes by doing each of the following:.


In particular, the results of the load-carrying capability or four-ball extreme pressure testing illustrated the aspect of performance dilution upon contamination. 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 an upgrade or machinery process change.

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. Current technology pinpoints assessment of dropping point, consistency after shearing conditions, and change after storage at extremely high temperatures as measurements providing the most information with the least resource aastm.

In addition, because equipment users usually do not have the proper resources to perform testing themselves, it is the responsibility of the grease supplier to measure grease compatibility with dropping point, penetration and high-temperature performance test machines.

Changes in physical properties would be reflected by a softening or hardening of grease consistency, or decreased shear stability upon mechanical working and even reduction in thermal stability identified by a reduction in dropping point.

The equation combines several ASTM test methods and properties that best represent performance. For a FREE grease assessment 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.

The supplier should also spend time with maintenance personnel to make sure they know what to look for going forward. The lower the percent weight loss the less likely the grease will wash out. It is best to both increase the frequency and reduce the volume. The sstm are in a few ASTM test methods. Select greases designed for the environment in which the equipment is operating. 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.


Simply put, all the grease samples were found to be compatible with one another. Toggle navigation Toggle search.

Maximizing Grease Performance Through Optimal Compatibility

The ability of a grease to perform under extreme pressure conditions is determined by the load wear index LWI. The performance dilution continues when the lithium complex grease is contaminated by both the lithium OH stearate grease and water. Contemplating a switch of grease products, due to poor performance or process change, brings to light the critical issue of compatibility. Select greases with similar thickening systems.

How do you know what grease will work best at protecting your equipment? Determines the strenghth of the boundary film between metal surfaces that provides extended protection.


Based on this value, one can formulate greases with different levels of extreme pressure properties. The result is metal-to-metal contact, premature wear and increased heat. How do you know if the grease you are using is right to protect against harsh environments AND routine operating wear.

An incompatibility issue could be reflected in reduced lubricating performance due to the modified composition of the fluids and additives from intermixing. Results are reported as pressure loss expressed in pounds per square inch psi with a functional range from 0 to psi.