. . . . Unlike the compatibility of oils, which is most often related to interactions of the additives in the products (and sometimes the nature of the base fluids themselves), the compatibility of greases is most often related to the thickener types of the products to be mixed (although base fluid compatibility is also important). . 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. . . . . Table 6. . . . . . . . . . . Low temperature and high speed synthetic grease based on barium thickener and mineral base oil. . . . Lithium and calcium soaps were compatible with one another, and neither was particularly good when mixed with a clay-based grease. . . . Table 5. . . . . The Grease Compatibility Charts found in company and . . . . Greases are considered to be compatible if the following conditions are met: The dropping point of the mixture is not significantly lower than that of the individual greases. Greases are considered to be compatible if the following conditions are met: Problems associated with grease compatibility can be minimized by specifying greases with similar thickening profiles, and by making sure that new greases are appropriate for the operating environment. . This can change the physical and chemical structure of the grease, causing an inability to hold or release the base oil. . This demonstrates a change in properties due to mixing and raises concerns about this mixtures performance in the long term. If this can not be carried out, Table 1: Grease Compatibility Generic Chart NOTE: This matrix is based on information commonly used in industry. . . . . . . . . . Valves, packings, seals & O-rings. . . . . . . . . Not all manufacturers agree with the thickener combinations, in the past when manufacturers used clay and soaps as the primary thickeners grease compatibility was more straightforward. . . . . . 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. . . . . While some lithium complex and polyurea greases are indeed compatible, it's difficult to know which ones are for sure without a compatibility test. Sheer stabilized Polyurea is compatible with just about all thickeners (much more so than the non-sheet stabilized). . . For those mixtures that prove to be incompatible, the extra effort must be taken to thoroughly clean all traces of grease from the housing, supply lines and bearings/gears to ensure long life and reliable machinery operation. . . In this case, each of the values for the 50-50 mixture is significantly different than the expected numerical average of the unmixed greases. . . 2. Somehow, though, these critical parameters are overlooked when utilizing grease compatibility charts. 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. More than 90 % of thickeners are soap based. . . Taking these precautionary measures to prevent the introduction of contaminants into the bearing will help ensure the proper operation of the bearing and performance to and beyond the rated life of the bearing. . The change in consistency of the mixture following elevated temperature storage is within the range of the change in consistency of the individual greases following elevated temperature storage. . . . . Grease compatibility charts have been developed and circulated since the 1980s without much alteration. . In bygone days, when simple soaps and clay were the primary thickener types, compatibility . 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. . . . . . Even so, those charts have their limitations. . . A typical grease compatibility chart is shown in Figure 1. . . Grease No. While reacting additives will not settle to the bottom in grease, as is the concern in oil, the changes can cause problems, impacting additive effectiveness and in some cases creating corrosive conditions in the grease. . . . . . . . However, the commonality ends there. . . It provides a general assessment of grease compatibility based upon the structural stability of mixtures of different grease thickeners. . . If research has demonstrated the unreliability of the different grease compatibility charts, it is important to discuss what additional steps can be taken to evaluate grease compatibility. . . the old grease with the new grease. . . . 2 is Cenex's Poly-Xtreme, a high-temperature polyurea grease. Compatibility between greases is based on three factors: thickener type, base oil, and additives. . . . Therefore, it is important to consider the type of base oil in the grease when determining compatibility. . Some mixtures will cause the thickener to release the oil, with the separated phase running freely from the bearing, gear or housing. Therefore, it became necessary to verify that one polyurea grease could be added directly to a motor containing the other. . . . . . . . . If the wrong grease has been inadvertently added to a machine or consolidation is required that will transition the use of a product in a machine, perform simulated mixing and working of the mixtures as well as dynamic properties testing to evaluate the mixtures performance. Remember, this chart may not be accurate for all greases. . . . . According to exploitation temperatures range . . . . . . . . . . . This compares to the 60 double strokes utilized to mix and work the binary mixture evaluated in the standard. . . . . In an ideal scenario you would remove all of the old grease from the machine before introducing a new one. . Grease thickeners can be divided into two categories, soap and non-soap. . . . . However, grease technology has changed significantly over the years, and there are many examples of performance that contradict several widely used compatibility charts. . . . . . Good chemical resistance. . It is wear resistant for use in a wide range of bearings.. NLGI viscosity grade is a rating of a grease's consistency. . If greases of different thickener types (both of which meet the performance requirements of the specification) get mixed in service, dire consequences can result. . 3.2.4. Greases are manufactured from both mineral oil and synthetic oil bases. More than 90% of the thickeners used worldwide are soap based. Grease compatibility charts (such as the one pictured below) can only help compare the thickener types of greases. . . . Other mixtures harden initially and lead to component load issues and poor grease motility. . . The electric motor test stand shown below was developed for the Electric Power Research Institutes Effective Grease Practices guideline. . . . . . . LGHP 2 is compatible with such greases. . . Don't Waylay Your Machine Tools with the Wrong Way Oil . . . . 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. . . . . Non-soaps are split into two main categories. . More Than List Price How Evaluating Synthetic vs. . . . . Greases are classified into two major families: soap and non-soap thickeners. . . "Base oil type and viscosity are the most . . Table 1: Grease thickener compatibility 1) SKF high performance, high temperature bearing grease LGHP 2 is not a common polyurea type grease. . . . Deionized Water? . (Top) The expected and actual yield stress values for the 50-50 mixture and the reference greases . . . Grease Compatibility Chart Mixing greases in a system can cause issues with thickener systems reacting with each other. . . . Furthermore, polyurea is better than lithium due to its lifelong application. Some may have been referring to the same product categories but failed to use common nomenclature, so it is difficult to determine where there might be an overlap. . . . . . . . . . Technical Help Desk 6 Jun 2017. . . . A grease thickener can influence your grease's operating temperature, load, speed, and material compatibility. . . . A mixture of greases introduced in a common ball bearing operating at 1,750 revolutions per minute will see nearly 30 million mixing and working events in just three days of operation. . If you are a human seeing this field, please leave it empty. . . In order to fully understand whether or not two greases are compatible, you need to test them. It is a di-urea bearing grease, which has successfully been tested for compatibility with lithium and lithium complex thickened greases i.e. . . . Improved extreme pressure and water resistance are also strong characteristics, making these greases excellent choices for automotive and robotics applications. . David Turner works for Shell Global Solutions Inc. and is the co-chairman of the National Lubricating Grease Institutes technical committee. . Grease performance and interactions Grease performance can be affected by interactions between: Thickener: Loss of structural stability. . clay non-soap Even when all plant personnel are given clear guidance on using the correct products, equipment may be returned to the facility with a grease that is different than what will be added while in service. . . . . Unfortunately, very few charts give any reference for the origin of the data or any research utilized to establish the compatibility relationships described. . "Thickener" is an umbrella term for a range of molecules, polymers or particles that are partially insoluble in lubricating oil that give the grease a semi-solid consistency. This could mean that your grease is no longer the correct grade for the machine. . Grease consistence (hardness) labeling according to NLGI standard . This type of thickener system can be referred to as a hybrid thickener or in some cases as a complex thickener. This is due to following capabilities: Outstanding rust and corrosion protection. . . Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. Today, with not only the aforementioned thickeners but also complex soaps, polyurea, calcium sulfonate and even more exotic thickeners used in many greases the issue of compatibility has become much more complicated. . . . . . . . . Several contradictions were discovered among the various charts. . Meets requirements of FDA 21 CFR 175.300. . The Changing Attitude Toward Basic Maintenance, Home | Metalworking Lubricants | Heavy Duty Truck Lubes | Industrial Lubricants | . . . . . . . . . . . Most grease suppliers have data on certain grease combinations or are willing to perform the required testing for their customers. . . Avoid This Common Shop Issue . . . . . . 5.2 There are two approaches to evaluating the compatibility of grease mixtures. Grease compatibility and conversion guidance Tech topic Key insight Compatibility testing enables users to make informed decisions when converting from one grease to another. A typical grease compatibility chart is shown in Figure 1. . . . Contains no lead or nickel. . . . . . . . . . . To learn more about NLGI, visit www.nlgi.org. Grade #3 greases have good sealing properties to protect the equipment . This is because of the wide variety of materials that can be reacted to form a thickener that is termed polyurea. . . . Many mixtures will initially soften, often to the point of migration through seals or away from lubricated surfaces. Grease compatibility charts (such as the one pictured below) can only help compare the thickener types of greases. . lithium complex. . . . . . Made with moisture-resistant thickeners, this grease stays in place in wet environments. Therefore, it is important to consider the type of base oil in the grease when determining compatibility. . . . . Acculube's Compatibility Chart For Commercial Greases, Talk with Us Today One area of the facility used a particular grease in all electric motors, while the remainder utilized another grease. . Excellent resistance to water, chemicals, and high and low temperatures. . . . . Lubricant Contamination Control Helps Prevent Varnish Formation in Machine Shops . Suitable for long-term lubrication by virtue of low oil evaporation and low tendency towards oxidation. There are three typical grease thickeners used in grease lubricants, including: Consistent lubrication frequency, without over- lubricating, also promotes a smooth transition. Polyurea greases are also characterized by dropping points above 250 C and low oil separation. . . . . . Metal Part Cleaning Basics Whether two different greases are compatible will depends mostly on the compatibility of the thickener used in the two products (although base oil compatibility can also be a consideration). . . . . . . . . . . . Significant concerns have also been raised about some of these charts after greases presented as compatible have proven to be quite incompatible. Conventional Oil Can Add or Subtract From Your Bottom Line . . . . . . . . . . Greases based on simple lithium soaps (lithium stearate or lithium 12-hydroxy stearate) and lithium complex soaps may or may not be compatible with polyurea greases. . . . . . . . . . . . . . Mixing greases in a system can cause issues with thickener systems reacting with each other. . . . Provide labels and color codes where possible to prevent confusion. The shaft is turned by a fractional horsepower motor, coupled to a turned-down shaft. . . Grease is a combination of thickener, oil, and additives. . Greases based on simple lithium soaps (lithium stearate or lithium 12-hydroxystearate) and lithium complex soaps (containing simple soap and a complexing agent, such as lithium azelate) may or may not be compatible with polyurea greases. . Calcium Sulfonate greases are an excellent alternative to traditional Lithium Complex for consistent performance in extreme conditions such as steel mills. . . . . . . . . . . Most thickeners do not mix together and there are specific greases that are not compatible with others. . . . Ongoing process maintenance with continuous monitoring by the supplier is also a strategy that will help insure success. : this chart is shown in Figure 1 the thickener in lubricating grease Institutes technical committee present in each the! To the 60 double strokes utilized to mix and work the binary mixture evaluated in the 17. State ) a lot of time and money combinations of these greases excellent choices for automotive and robotics. 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