What are the five indicators of lubricating oil testing?
1 Answers
Lubricating oil testing involves five key indicators: mechanical impurities, flash point, viscosity, water content, and base number/neutralization value. Mechanical impurities: Mechanical impurities refer to insoluble substances or colloidal suspensions present in lubricating oil that do not dissolve in solvents such as ethanol, gasoline, or benzene. Flash point: For oils with the same viscosity, a higher flash point is preferable. Viscosity: Viscosity measures the internal friction of a fluid in motion and indicates the oil's ability to resist flow at specific temperatures. Without additives, higher viscosity means poorer fluidity but greater oil film strength. Water content: The presence of water in lubricating oil can disrupt the oil film formation, reducing lubrication effectiveness. Base number and neutralization value: Acid number indicates the presence of acidic substances in lubricating oil, categorized into strong acid number and weak acid number.