properties of grease

Then, the penetration is measured. There is a misconception, however, that even though the thickener may be able to withstand the high temperatures, the base oil will oxidize quickly at elevated temperatures, thus requiring a frequent relube interval. If the temperature of a lubricating grease is lowered enough, it will become so viscous that it can be classified as a hard grease. Dielectric grease is made by combining silicone oil with a thickening agent which makes an effective barrier against moisture and salt precipitate. Additives imparting special properties may be included.” Fig. Toll Free Engineering and Design - Lubricants and Hydraulic Fluids. Grease is comprised of two structural components: a base fluid and a thickening agent. Also the tribol-test results indicate that the CB can dramatically improve the tribological properties of the greases. Automotive assemblers hang painted metal parts on long conveyors and weave them through large drying ovens to dry painted metal surfaces. These primarily include enhancing the existing desirable properties, suppressing the existing undesirable properties, and imparting new properties. Contact our team of reliability specialists and find out how we can help you with your lubrication program. Effective grease lubrication depends on the grease's consistency. The dropping point indicates the upper temperature limit at which a grease retains its structure, not the maximum temperature at which a grease may be used. High temperatures induce softening and bleeding, causing grease to flow away from needed areas. Check out some of the uses of the Lithium Grease: 1. Grease maintains thicker films in clearances enlarged by wear and can extend the life of worn parts that were previously lubricated by oil. A grease's consistency is its resistance to deformation by an applied force. physical properties of grease; pumpability, dropping point, mechanical stability, and oil separation. It is used in many applications including home electrical work, vehicle wiring, and automotive tune-up. The viscosity of the base fluid is determined by the viscosity of the fluids used, as well Automotive Uses. Grease is sometimes used to describe lubricating materials that are simply soft solids or high viscosity liquids, but these materials do not exhibit the shear-thinning (thixotropic) properties characteristic of the classical grease. The thickener is described in terms of its chemical and mechanical structure. Four Ball Wear Test: evaluates the wear preventive properties of the grease. A true grease consists of an oil and/or other fluid lubricant that is mixed with a thickener, typically a soap, to form a solid or semisolid. Machinery that is not easily accessible for frequent lubrication. As grease temperature increases, penetration increases until the grease liquefies and the desired consistency is lost. Grease holds solids in suspension while solids will settle out of oils. 1. The properties of a grease are determined by the quality of the oil it is made of. Grease has more resistance to motion at start-up than oil, so it is not appropriate for low torque/high speed operation. General rule of thumb is 50°C below the dropping point should be the maximum operating temperature. The measure of consistency is called penetration. Properties of bacon grease. The most important performance properties are determined by the application. The Lithium Grease is mainly used as an ideal metal to metal lubricant in the automotive industry. U.S. Army Corps of Engineers. Finely ground solid lubricants, such as molybdenum disulfide (moly) and graphite, are mixed with grease in high-temperature service or in extreme high-pressure applications. Properties exclusive to grease include dropping point, mechanical stability, water washout, bleed characteristics and pumpability. It is the mass of liquid per unit volume. The National Lubricating Grease Institute (NLGI), defines grease as: “A solid to semi-solid product of dispersion of a thickening agent in a liquid lubricant. Grease Properties and Tests Dropping Point. (ASTM D1264), Water Spray: evaluates the ability of the grease to adhere to a metal surface when subjected to direct water spray. The grease should have good stability and not contain metals in any form, and be specifically designed for use as a dielectric grease. Both dielectric grease and "conductive" greases (anti-seize) are insulators. The grease properties will be give in terms of performance. There is a couple ways to determine water resistance. Measure of a grease’s heat resistance – as grease temperature increases, penetration increases until the grease liquefies and the desired consistency is gone. Physical Properties of Lubricants. Poor Lubrication Properties Compared to Other Greases (copper grease is primarily an anti-seize grease) Can Interfere with Modern Breaking Systems - (eg: noise fix shims) Copper Can Interfere with Electrical Components - (copper is a conductor and can have detrimental impacts on electrical systems eg: magnetic sensors in ABS braking systems) AP Grease is a lithium based multifunctional high temperature, water resistant grease. 1. (ASTM D2266), Four Ball Extreme Pressure (EP) Test: evaluates the extreme pressure properties of the grease. Silicone grease, sometimes called dielectric grease, is a waterproof grease made by combining a silicone oil with a thickener. It can be applied in many different automotive and household settings. BENEFITS OF GREASE Greases • keep oil in place • handle heavier loads • act as a sealant • can control noise and motion • allow for a broader range of additives 6. It is measured in tenths of a millimeter that a standardized cone penetrates a grease sample. Greases are usually shear-thinning or pseudo-plastic fluids, which means that the viscosity of the fluid is reduced under shear. Other ingredients imparting special properties may be included" (ASTM D 288, Standard Definitions of Terms Relating to Petroleum). (1) Poor cooling. The properties of calcium sulfonate complex greases and their structures. Following are the important properties of a lubricant. In addition to its basic components, grease properties, such as penetration or wear resistance, should be taken into consideration when determining the type of grease to use for your specific application. High-quality greases can lubricate isolated or relatively inaccessible components for extended periods of time without frequent replenishing. The function of grease is to remain in contact with and lubricate moving surfaces without leaking out under the force of gravity, centrifugal action or being squeezed out under pressure. Generally, the base oil’s pour point is considered the low-temperature limit of a grease. It also acts to keep deteriorated seals effective. Physical Properties of Lubricants. The physical properties of lithium grease mean that it does not break down under heavy loads and continues to do its job. Density Density is fundamental physical property of oil. hbspt.cta.load(3951034, '0185d019-b885-48b3-81bb-598c6269bb64', {}); As with oil, grease displays its own set of characteristics that must be considered when being chosen for an application. The properties of the grease make it a perfect choice for different applications. It is measured at specific temperature by Hydrometer or Automatic Density Meter. 2. Worn components. Lately, complex thickener-type greases are gaining popularity. Grease holds solid lubricants in suspension. RHEOLOGICAL PROPERTIES OF A LUBRICATING GREASE i C. R. Singleterry and E. E. Stone Naval Research Laboratory, Washington, D. C. Received January 30, 1951 INTRODUCTION" McKee (1) has described the construction and use of a worker-con- sistometer for lubricating greases which makes use of the small sample size and the high shear rates of the Hain microworker (2) in connection with …

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