Water Washout and Resistance to Water Spray: The Key Tests Needed to Determine a Greases Ability to Act as a Sealant
Dr. Raj Shah - Koehler Instrument Company, Inc.
- Isaac Kim - Koehler Instrument Company, Inc.
Lubricating greases have a wide array of uses due to their high viscosity and shear thinning properties. Grease is a semi-solid lubricant allowing for it to stay in position in some scenarios where a lubricating oil would not. In many applications such as metalworking operations or the marine industry where there is a frequent ingress of water, greases are also used as a sealant. In these scenarios, the most salient property of grease is its ability to seal out water. Some obstacles facing this property is the amount of grease that washes away due to water, also known as the water washout of grease as well as the ability of the grease to adhere to a surface when subjected to direct water spray. Thus, it is vital to ensure that greases, under such conditions, remain unaffected by water in order to decrease the wear and failure of machinery. ASTM test methods, ASTM D1264, for Determining the Water Washout Characteristics of Lubricating Greases, and ASTM D4049 for Determining the Resistance of Lubricating Grease to Water Spray, allow for precise and repeatable means to ascertain the qualifications of grease when under the impingement of water. In this poster, we will analyze the function and properties of a novel instrument, which utilizes ASTM D1264 for characterization of greases as well as equipment employing ASTM D4049 to determine the water spray properties of a grease.