. . . . . . . . ASTM D6185 details a procedure to check the compatibility of a binary grease mixture by mixing the two greases together in various proportions (usually 25:75, 50:50, and 75:25) and testing the resulting 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. . . . . . . . Mixing of greases with incompatible thickeners can result in the most immediate and obvious changes that interfere with effective lubrication. . . Goodbye, Tramp Oil Tramp Oil Contamination Is Not Inevitable . . Mixing different greases, even those with similar thickener types, can lead to ineffective lubrication and result in component damage. Grease consistence (hardness) labeling according to NLGI standard . . . . . . . Polyurea greases offer excellent performance in industrial equipment. . . . . Table 1: Grease thickener compatibility Coolant Sump Odor; What to Do Grease labeling according to standards . . . . . . . . Many mixtures will initially soften, often to the point of migration through seals or away from lubricated surfaces. . Significant concerns have also been raised about some of these charts after greases presented as compatible have proven to be quite incompatible. . Furthermore, polyurea is better than lithium due to its lifelong application. . Although there were significant disagreements between the various charts, they all had one thing in common - few provided any link or reference to research that was conducted to develop them. Table 2. . . . . . More than 90 % of thickeners are soap based. . . "Why Does This Sump Smell?" . . . . . Don't Waylay Your Machine Tools with the Wrong Way Oil . . 3. . . Soap-based thickeners are produced from an acid base reaction. . . The short answer is, "No". . High load-carrying capacity. To add to the confusion, there are some grease specifications that are based solely on grease performance without regard to grease composition. . . Grease compatibility charts (such as the one pictured below) can only help compare the thickener types of greases. . . . . . . . . . . . . . "Base oil type and viscosity are the most . 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. . . Compatibility testing is the only way to verify compatibility. . . . 3.3.2. . . . . . . . Otherwise, you should be perfectly fine in your application even with some residue. . 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. . Many mixtures will initially soften, often to the point of migration through seals or away from lubricated surfaces. . . . However, this may not be necessary if the two greases in question are compatible with one another. . . Valves, packings, seals & O-rings. . Viscosity is critical when selecting any lubricant. . . Contact Us: 1.800.404.2570 or email us at. . . . Why is Oil Testing Important for New Oil? . Grease compatibility charts (such as the one pictured below) can only help compare the thickener types of greases. . Grease compatibility is a straight forward concept when armed with the correct knowledge. > . . . How to Choose an . In bygone days, when simple soaps and clay were the primary thickener types, compatibility was relatively straightforward. . . . . . and How Can it Reduce Total Lubricant Costs? Performance Benefits. . . . According to a 2018 survey of worldwide grease production, 74.18%, by volume, contain lithium soap thickener. . . . According to exploitation temperatures range . . . . . 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. . . . . . . . the old grease with the new grease. For Commercial Greases . . . . . Polyurea greases are also characterized by dropping points above 250 C and low oil separation. This test stand consists of the end bell from a 60-horsepower electric motor mounted with a ball bearing in a stub shaft. . . . . . Several contradictions were discovered among the various charts. . . . 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). Suitable for long-term lubrication by virtue of low oil evaporation and low tendency towards oxidation. . Refer to Grease Compatibility and Grease Lubrication Practices for more information on grease compatibility. . . Long bearing life Outstanding thermal and oxidation stability. . Excellent high temperature performance. . . . . . . . . . . . . . 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. . . . Table 1. . . . How to use a Grease Gun . . 2017 by Accurate Lubricants & Metalworking Fluids, Inc. located in Dayton, Ohio U.S. All rights reserved. . hbspt.cta.load(3951034, 'c99217f3-09e7-4751-bc3a-7739dac44a0e', {}); Grease Compatibility Chart and Reference Guide, Spectro Scientific FluidScan 1100 - Handheld Infrared Oil Analyzer, Shell Turbine Oil with Gas To Liquid Technology (Turbo S4 X & GX), How to Cost Justify a Lubrication Program. Compatibility within this test is defined as the characteristic of greases to be mixed together without significant degradation of properties or performance. . . . Calcium Sulfonate greases are an excellent alternative to traditional Lithium Complex for consistent performance in extreme conditions such as steel mills. Food Grade Lubricants |Biodegradeable Lubricants | Industrial Lubricants Store | Contact But thanks to the polyurea thickeners that are far better than any lithium-complex grease. . . . . Call the metalworking experts at Acculube - we'll help you get the most value Low noise. Ongoing process maintenance with continuous monitoring by the supplier is also a strategy that will help insure success. . . . . Grease Compatibility Chart. . In some cases, dissimilar thickener types are combined in a grease. . This is because of the wide variety of materials that can be reacted to form a thickener that is termed polyurea. . . Standard compatibility tests may consider the stability of the oil/thickener matrix by evaluating a grease's shear stability, dropping point, storage stability and high-temperature performance. 4 The type of thickener influences grease properties such as temperature resistance, which relates to viscosity, and water washout, which is the ability of the grease to still perform and remain intact when submerged in water. 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. Greases are classified into two major families: soap and non-soap thickeners. Acculube's Compatibility Chart For Commercial Greases, Talk with Us Today For example, one chart indicated that barium-complex grease is compatible with clay-thickened grease, while others suggested this mixture is incompatible. This mixture will be subjected to continuous dynamic forces, and its performance and possible degradation will be influenced by this more than the static response seen in cone penetration or dropping point measurements. However, the commonality ends there. . . Grease Compatibility. While some lithium complex and polyurea greases are indeed compatible, it's difficult to know which ones are for sure without a compatibility test. . . . . . . Grease compatibility charts have been developed and circulated since the 1980s without much alteration. 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. a Proven Brand of Lubricant . . . . The conditions observed are noted, and the grease is removed from the bearing. . . . . to Lubricate Plain Bearings? . . . . . . . Deionized Water? Table 3. While this standard has greatly improved the uniformity to which greases can be tested for compatibility, it should be noted that the three evaluation tests are static in nature. . . Note: The compatibility charts should be used as a reference only.Compatibility testing is the only way to verify compatibility. However, carefully mixing the greases in different ratios and subjecting them to mixing, working and heating cycles can reveal measureable changes in properties to predict their performance in a machine. While there are advantages to staying consistent with one lubricant product per task, this often means that improvements in performance - or cost - can't be realized. . . from every lubricant and other critical fluid you buy, and avoid the common pitfalls that can cost you money. . . . . . . Grade #3 greases have good sealing properties to protect the equipment . . . polyurea conventiona. . . . . . . a grease with different thickener should especially proceed with caution. . . . polyurea. . . . . . . Greases with same thickener type . . . . . . Others need to be inert due to material compatibility, or they may be in aggressive environments where they are exposed to corrosive or acidic environments. Proper care must be taken to ensure compatibility when changing from one grease system to another, including cleaning if possible, compatibility verification (including base oil), monitoring and assessing, purging and flushing of old grease, and even repurging as necessary. In this case, each of the values for the 50-50 mixture is significantly different than the expected numerical average of the unmixed greases. . . . . Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. Therefore, it became necessary to verify that one polyurea grease could be added directly to a motor containing the other. . . . With Polyurea Greases we are talking about a specific type of thickener for lubricating greases. . According to capability to bear high loads . . . . . . . Though manufacturers make grease compatibility charts available, information can be vague or contradictory. . If you are ever unsure if two greases are compatible be sure to test them before adding a new grease to your machine. An excessive load-wearing capacity. . Technical Help Desk 6 Jun 2017. . . . What Is MQL (Minimum Quantity Lubrication) . . . . 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. . Most grease suppliers have data on certain grease combinations or are willing to perform the required testing for their customers. Reduces wear in plastic-to-metal and rubber-to-metal contact. . + = Compatible = Test required - = Incompatible . . . . 2 is Cenex's Poly-Xtreme, a high-temperature polyurea grease. . . . . . . . . . . . . . . . . The resulting mixtures are evaluated for changes in dropping point, shear stability and storage stability. Grease Compatibility Chart Mixing greases in a system can cause issues with thickener systems reacting with each other. . . . . . As such, to verify whether two greases are compatible or not, Machinery Lubrication developed a Compatibility Chart based on thickener type. . . . Grease thickeners can be divided into two categories, soap and non-soap. . . . . Incompatibility is a major issue when mixing greases something that can result from having too many types of grease in a plant. . . . The rheological values for the two worked reference samples and the 50-50 worked mixture, with the values of concern in yellow. Unfortunately, very few charts give any reference for the origin of the data or any research utilized to establish the compatibility relationships described. . . . Sometimes these changes are not immediately apparent, and become obvious only with diminished equipment performance. . . . . . This generally allows for smooth operation of equipment. . . . In grease-lubricated applications, on the other hand, it is usually impossible to remove all of the old grease from the application when changing products. . . The efforts to avoid mixing where possible and to test mixtures for compatibility issues as well as taking the appropriate actions will be an investment in reliability that will pay dividends. . See the above example for composition or formulation. . Conventional Oil Can Add or Subtract From Your Bottom Line This is somewhat understood, since the most common reason for grease mixing problems is related to differences in the grease thickener, but that is not the only issue. Most OEM, industry and supplier recommendations suggest performing a compatibility test to assess the risk of mixing two greases. . 2. . . Accurate Lubricants & Metalworking Fluids, Inc. 403 Homestead Avenue; Dayton, Ohio 45417 USA Phone: 937-461-9906 Fax: 937-461-9917 . . . . In these situations, component damage is likely the result of the chemical or structural interaction between the thickener or additive systems of . . And we can help you meet the latest performance requirements for extreme pressure, wear protection, corrosion inhibition, extended grease life, energy efficiency and the other challenges you face. . . Why is a Breather Filter Important? lithium. It is necessary to perform compatibility testing on combinations of these greases to determine whether the greases can be mixed in service. The mechanical stability of the mixture is within the range of consistency of the individual greases. . . . . . . . . . 12-hydroxy stearic acid and hydrogenated castor oil added (the preferred ratio is 85:15 up to 50:50). 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. . . . . Cost and Other Considerations When purchasing a grease, a basic lithium grease will be cheaper than a sophisticated polyurea grease. . . . . . . . . These last two parameters include measuring changes in the cone penetration value. . 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. . . . . . . . . and Save Money? hbspt.cta.load(3951034, 'c99217f3-09e7-4751-bc3a-7739dac44a0e', {}); Unboxing: perma ULTRA Automatic Lubrication System, Product Unboxing - Simalube Single-Point Automatic Lubricators, How to Calculate Grease Quantity and Frequency for Bearings, Spectro Scientific FluidScan 1100 - Handheld Infrared Oil Analyzer, Shell Turbine Oil with Gas To Liquid Technology (Turbo S4 X & GX), How to Cost Justify a Lubrication Program, How to Determine Grease Compatibility and Why It's Important. . . . . When changing grease thickener types in an application, always consult your lubricant supplier on the compatibility of a proposed product with one that's being replaced. . . If this can not be carried out, Table 1: Grease Compatibility Generic Chart NOTE: This matrix is based on information commonly used in industry. . . . . . . Common non-soap thickeners include polyurea, organophilic clay, fumed silica, fluoropolymers, and others. . . . . However, these charts rarely tell the whole story, even just in terms of the thickener compatibility. . . . . . . . . . . . Compatibility between greases is based on three factors: thickener type, base oil, and additives.
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