ASTM D8022-20, developed by the American Society for Testing and Materials (ASTM), defines a test method for determining the roll stability of lubricating grease in the presence of water (wet roll stability) using a roll stability testing device.
.jpg "ASTM D8022-20 Standard Test Method for Rolling Stability of Lubricating Grease in the Presence of Water (Wet Roll Stability Test)")
Contamination with water is known to affect the structural stability of some greases in service. The test method specified in this standard is widely used to determine the wet structural stability of greases in service. Many grease specifications require this test method as a wet structural stability test. A precise relationship between the wet structural stability of the grease in actual service and the test results has not been established.
Water pollution is known to adversely affect the structural stability of some greases in service. The test applied to solve this potential problem is the wet roll stability test method, which determines the roll stability of lubricating grease in the presence of 10 weight percent added water.
Mechanical stability is of central importance when it comes to the long-term service life of grease-lubricated roller bearings. Poor stability causes the consistency of the grease to deteriorate due to mechanical forces between the rotating parts of the bearing. As a result, the seals leak grease or, in the worst case, the bearing fails completely. Methods applied today for mechanical stability estimation show poor correlation with actual service length. On the other hand, both field and laboratory tests are carried out in order to develop a useful alternative. Comparisons between field tests and laboratory tests indicate weak correlation.
The service life of grease-lubricated bearings is highly dependent on the performance of the lubricating grease. However, water is one of the most common contaminants in grease lubrication or oil lubrication. Water affects the rheology, chemistry and microstructure of the grease, reducing its performance. Oil softens or sometimes hardens after absorbing water. There is no complete information about the film forming capacity of greases contaminated with water. However, the film forming capacity of oil contaminated with water is more known.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides standard testing services for the rolling stability of lubricating grease in the presence of water within the scope of ASTM D8022-20 standard, with its trained and expert staff and advanced technological equipment.
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