The ASTM D7342-20 standard, developed by the American Society for Testing and Materials (ASTM), describes a test method for determining the shear stability of lubricating grease in the presence of water (wet shear stability). This test method is also known as the water stability test.
.jpg "ASTM D7342-20 Standard Test Method for Long-Term Service Stability of Lubricating Grease in the Presence of Water (Water Stability Test)")
Contamination with water affects the shear stability of some greases in use. This test method is widely used to determine the wet shear stability of greases in service. Many grease standards require these procedures as wet shear stability testing. A precise relationship has not been established between the wet shear stability of the grease in actual service and the test results.
Many grease-lubricated components operate in wet environments, making them susceptible to water contamination that reduces their performance, functionality, and lifespan . Therefore, selecting a grease with appropriate water-resistant properties has a significant impact on the longevity of the machine. Industry standards are being developed to evaluate the water resistance of a grease. Research indicates that more comprehensive studies on water resistance are needed to properly match a grease to an application.
Water is one of the most common contaminants that interfere with the operation of machinery as it mixes with the lubricating grease due to the complete sealing of bearings, storage containers or other grease holding devices. Water contamination in general significantly alters the chemical properties of grease and causes equipment failure through extensive corrosion, oxidation, leakage and oil flow restriction. Concentrations as low as 100 ppm can cause drastic changes in lubrication performance and therefore in the fatigue life of a bearing. The presence of water must be considered for grease applications in steel mills, paper mills, mining operations, food production equipment and outdoor equipment to prevent premature failures.
Our organization, among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, with its trained and expert staff and advanced technological equipment, standard test (water stability test) for the long-term stability of lubricating grease in the presence of water within the scope of ASTM D7342-20 standard. ) also provides services.
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