. . . . . The compatibility of greases is most often related to the thickener type. Back in the old days, they used simple soaps and clay as the most common thickeners, and compatibility was easy to determine. . . . Simply mixing two greases together to observe changes may not provide any obvious difference. . . . . . . One area of the facility used a particular grease in all electric motors, while the remainder utilized another grease. . . . If this can not be carried out, Table 1: Grease Compatibility Generic Chart NOTE: This matrix is based on information commonly used in industry. . . . . . . . Chips Off the Old Block . . 3.2.5. . . As such, to verify whether two greases are compatible or not, Machinery Lubrication developed a Compatibility Chart based on thickener type. . Therefore, it became necessary to verify that one polyurea grease could be added directly to a motor containing the other. . . NLGI 3 grease has a semi-solid appearance and is a common lubricant in automotive, industrial, marine, and agricultural applications. . . . . . In this case, each of the values for the 50-50 mixture is significantly different than the expected numerical average of the unmixed greases. . See the above example for composition or formulation. . It is interesting to note that these grease compatibility charts focus only on the family of thickener involved. . . . . . . . . . . . . . Note: This chart is a general guide to grease compatibility. . . . . . . . . . ASTM D6185 (Standard Practice for Evaluating Compatibility of Binary Mixtures of Lubricating Greases) involves the mixing of the intended greases in ratios of 25-75, 50-50 and 75-25. Vibratory Finishing Basics . . . . Black cells indicate compatibility testing not performed. . . 3. . . . . . Some synthetic base oils are incompatible with mineral oils and other types of synthetics, just as in the mixing of lubricating oils. . . This table is to be used as a reference only. . . . Particulates in Cutting Fluid -- A Fine Mess. . . . . . . lithium. Cost and Other Considerations When purchasing a grease, a basic lithium grease will be cheaper than a sophisticated polyurea grease. Many mixtures will initially soften, often to the point of migration through seals or away from lubricated surfaces. B = Borderline C = Compatible I = Incompatible How Can Oil Leak Dye Pinpoint Leaks . Too often the presumption is that "grease is grease". . . . . . . . . . Polyurea Greases are anorganic, non-soap based thickeners which are alternatives to the commonly known metal- and metalcomplex soap thickeners. Lithium and calcium soaps were compatible with one another, and neither was particularly good when mixed with a clay-based grease. . . . . . . Performance Benefits. It is recommended to match "like-for-like." If you plan to make a switch, it is best to completely drain your equipment before applying new grease. . . . . While the compatibility of oil products is largely related to the base and additives, grease compatibility is connected to the types of thickeners used. . When changing oil and grease lubricants, it is wise to work with an experienced supplier with extensive knowledge of compatibility issues and good testing resources. . . If corrective action is not taken quickly enough, this can result in damage to the machine. Forgive my grease illiteracy. . Excellent high temperature performance. . . The tests that are conducted should be agreed upon between the user and grease supplier to assure that the properties that are critical to the proper function of the product in service are covered. . Contact Us: 1.800.404.2570 or email us at. Formulation or additive incompatibility - this is dependent on the robustness of the thickener structure and can occur even when the thickener systems are the same, for example lithium/lithium. . Borderline The properties of the mixture may or may not be acceptable, depending on the nature of the application. Significant concerns have also been raised about some of these charts after greases presented as compatible have proven to be quite incompatible. . . . . . 5. However, the commonality ends there. . . For the purpose of testing grease mixtures, the 25-75, 50-50 and 75-25 ratios are packed sequentially into the bearing by hand, and the adjacent housing area is packed half full. . . 3.3.1. In order to minimise issues arising from incompatibilities, ExxonMobil laboratories routinely test different grease technologies to assess their compatibility when mixed with other grease products in various ratios.The table below also gives an indication of the compatibility of various grease thickener combinations. . . . Low temperature and high speed synthetic grease based on barium thickener and mineral base oil. To learn more about NLGI, visit www.nlgi.org. . . . . . . . . . . . Grease Compatibility Chart. . . . . . . A typical grease compatibility chart is shown in Figure 1. . 1) SKF high performance, high temperature bearing grease LGHP 2 is not a common polyurea type grease. . . . . . . . . 2 is Cenex's Poly-Xtreme, a high-temperature polyurea grease. . . . . . For the best experience on our site, be sure to turn on Javascript in your browser. . . . 2018 TheLubricantStore.com All Rights Reserved. thickener compatibility. For this reason, the mixture was not permitted at the facility, and the decision was made to keep two greases in place until the motors could be removed and thoroughly cleaned of the existing product. . . Some thickeners need to be non-melting and withstand temperature significantly hotter than what traditional soap greases can handle. + = Compatible = Test required - = Incompatible . Some studies have been performed to improve the mixing and working of grease to better simulate machine conditions. High load-carrying capacity. . It can be difficult to avoid mixing greases in a plant environment, but several steps can be taken to minimize the impact and likelihood of mixing incompatible greases. . . . . . . It provides a general assessment of grease compatibility based upon the structural stability of mixtures of different grease thickeners. . It is understood that when oils are mixed, any incompatibility in the additive packages will result in poor performance and often additive reactions creating deposits. . . The Changing Attitude Toward Basic Maintenance, Home | Metalworking Lubricants | Heavy Duty Truck Lubes | Industrial Lubricants | The thickener defines the type of grease (see Fig. . This type of thickener system can be referred to as a hybrid thickener or in some cases as a complex thickener. . Motor Bearing Grease . . The most likely result is a change in consistency or increased oil bleeding, especially under shear stress. Grease compatibility charts have been developed and circulated since the 1980s without much alteration. Table 4 shows the rheological values for the two worked reference samples and the 50-50 worked mixture. . Issues with oil and grease compatibility most often manifest in problems including abnormal consistency and separation, leakage, insufficient bleed in contact zones, and premature aging. Thickener Compatibility Mixing of greases with incompatible thickeners can result in the most immediate and obvious changes that interfere with effective lubrication. . . Suitable for long-term lubrication by virtue of low oil evaporation and low tendency towards oxidation. . Grease compatibility is on the minds of a lot of maintenance managers these days. If those properties of the mixtures compare favorably to whichever of the individual greases performs worse, they are considered compatible. This could mean that your grease is no longer the correct grade for the machine. . . . . . . . . . Greases are classified into two major families: soap and non-soap thickeners. . NLGI 2 is about the consistency of peanut butter.. Mineral-oil-based grease, derived from petroleum, is usually more economical than synthetic-oil-based grease. . These charts are readily available in published papers, periodicals and Web pages. . . . a grease with different thickener should especially proceed with caution. . . . . . . . Compatibility of grease mixtures is typically categorized as follows: According to a 2018 survey of worldwide grease production, 74.18%, by volume, contain lithium soap thickener. . 1. . . . . . . . . . . . Though manufacturers make grease compatibility charts available, information can be vague or contradictory. . . . In the case of lubricating oils, it is often possible to change the fluid completely; and when that is not possible, the compatibility of the fluids can be relatively easily determined. . . . . . . . Vacuum pumps. . . . . Table 1: Grease thickener compatibility . Lubricants often fail to perform as specified when combined with other products, even in small concentrations. Valves, packings, seals & O-rings. . . Made with moisture-resistant thickeners, this grease stays in place in wet environments. Grease, however, may be more difficult to purge. The upper operating limit for a grease is usually recommended to be 100-150F lower than the dropping point. . How to make grease: The process to make anhydrous calcium soap grease. . . . . . Charged 15% of the total base oil to an open kettle. . . . . . . . . Compilation of 17 grease compatibility charts. Note: The compatibility charts should be used as a reference only.Compatibility testing is the only way to verify compatibility. JavaScript seems to be disabled in your browser. Uncommonly, even greases of the same type, although normally . . . . . . Thus, choosing a new grease that is compatible with the existing one can save a lot of time and money. . . . . . . . Do not stock additional products for convenience or brand loyalty. . . Grade #3 greases have good sealing properties to protect the equipment . When a grease mixture is introduced into a machine, such as a motor bearing, it will undergo significant mixing and working in a relatively short period of time. . . . The resulting mixtures are evaluated for changes in dropping point, shear stability and storage stability. . . You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long. . . . . Grease labeling according to ISO standard . This is because the charts from the various manufacturers often disagree with one another on certain thickener-type combinations. . . lithium stearate. . . . . . . . The first example is of two common polyurea-thickened greases. . . . . . . . . . When changing to a different oil, it is typically an option to discharge and change fluids completely. . . Generally, greases having the same or similar thickener types will be compatible. . . . . . . . . . . Acculube Compatibility Chart . . . It is wear resistant for use in a wide range of bearings.. NLGI viscosity grade is a rating of a grease's consistency. When it comes to lubrication in industrial plants, most maintenance people strive for consistency the use of the same products over a long period of time. . . . "Why Does This Sump Smell?" . . Most grease suppliers have data on certain grease combinations or are willing to perform the required testing for their customers. . . . Taken together, these tests may provide a more comprehensive picture of the potential effects of mixing two grease products together and help users avoid reliability issues from grease mixing, even for products that might otherwise appear to be compatible on charts. . In an ideal scenario you would remove all of the old grease from the machine before introducing a new one. Grease Compatibility Chart Mixing greases in a system can cause issues with thickener systems reacting with each other. . Maximize Fluid Performance . . . These thickeners can be broken into three groups: Simple - A simple soap resulting from the reaction of a single acid, usually 12 HSA and a metallic hydroxide, usually lithium, aluminum, calcium or sodium. Table 2 shows the product information for both greases tested.
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