. Long bearing life Outstanding thermal and oxidation stability. Suitable for long-term lubrication by virtue of low oil evaporation and low tendency towards oxidation. . . . . . . . . . . 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. The mechanical stability of the mixture is within the range of consistency of the individual greases. . Specific properties of greases can dictate suitability for use. . . This demonstrates a change in properties due to mixing and raises concerns about this mixtures performance in the long term. . Grease compatibility charts have been developed and circulated since the 1980s without much alteration. . . This can change the physical and chemical structure of the grease, causing an inability to hold or release the base oil. of Metalworking Fluids . . Many mixtures will initially soften, often to the point of migration through seals or away from lubricated surfaces. . . . . . . The shaft is turned by a fractional horsepower motor, coupled to a turned-down shaft. To help users understand the implications of mixing greases, ASTM International (formerly the American Society for Testing and Materials) Committee D02.G developed ASTM D6185 Standard Practice for Evaluating Compatibility of Binary Mixtures of Lubricating Greases in 1997. Selecting Diesel Engine Oil for Mixed Fleets . . . . . . It is wear resistant for use in a wide range of bearings.. NLGI viscosity grade is a rating of a grease's consistency. . . . . . . Soaps can be grease thickeners, while non-soap thickeners include polyurea, organophilic clays (e.g., bentonite) and other materials. . . . The acid is a fatty, along with, in some cases, a short-chain organic complexing acid. Also, while lithium thickener remains the most prolific, a greater variety of other thickeners are becoming available due to lithium demands for batteries. Most thickeners do not mix together and there are specific greases that are not compatible with others. . . . . . . . . . . . . . . . Compatibility of grease mixtures is typically categorized as follows: Compatible The properties of the mixture are similar to those of the individual grease. . . . Some thickeners need to be non-melting and withstand temperature significantly hotter than what traditional soap greases can handle. When mixing oils, the key considerations are the viscosity of each product, the base oil type and the thickener. . Provide labels and color codes where possible to prevent confusion. Compatibility testing is always the best option, since the base oil and elastomer must also be taken into consideration. . . . . . Table 1 shows the labels used in these charts and how many times these descriptions appear in the charts. . . . and Save Money? . . The reason being, some polyurea thickeners are completely compatible with lithium and lithium complex thickeners, while others are incompatible. . . Too often the presumption is that "grease is grease". . Polyurea greases are also characterized by dropping points above 250 C and low oil separation. . . Valves, packings, seals & O-rings. . . . . . . . . . . . . . . If corrective action is not taken quickly enough, this can result in damage to the machine. . (Bottom) The expected and actual recoverable compliance values for the 50-50 mixture and the reference greases. . . . . . . . . . . from every lubricant and other critical fluid you buy, and avoid the common pitfalls that can cost you money. . Grease compatibility is on the minds of a lot of maintenance managers these days. . . . Generally, greases having the same or similar thickener types will be compatible. . . . Sheer stabilized Polyurea is compatible with just about all thickeners (much more so than the non-sheet stabilized). Google "grease compatibility chart" and you will find a bunch of charts that rate compatibility (based on change in worked penetration) of greases according to their thickener. . Uncommonly, even greases of the same type, although normally . . . . Thickener products give the grease consistency and hold the lubricant in place, so it stays where it's supposed to, and the formation remains together. polyurea shear stable. Vibratory Finishing Basics . . . . . . More than 90% of the thickeners used worldwide 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. . Acculube Compatibility Chart . . . The ability of this testing to adequately predict in-service mixtures may be reasonably questioned. . . Ongoing process maintenance with continuous monitoring by the supplier is also a strategy that will help insure success. Back in the old days, they used simple soaps and clay as the most common thickeners, and compatibility was easy to determine. . . This is then run for 72 hours to achieve the 30 million plus perturbations of the grease. . For the best experience on our site, be sure to turn on Javascript in your browser. The resulting grease carries unknown performance characteristics (load, temperature stability, shear, etc. . Furthermore, polyurea is better than lithium due to its lifelong application. 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). . Conventional Oil Can Add or Subtract From Your Bottom Line . A typical grease compatibility chart is shown in Figure 1. . . . Some mixtures will cause the thickener to release the oil, with the separated phase running freely from the bearing, gear or housing. The explanation lies in the fact that with the deterioration of oil and thickener compatibility, the solubility of the latter decreases; the volume fraction of the thickener particles . . grease. . . . . . . This compares to the 60 double strokes utilized to mix and work the binary mixture evaluated in the standard. . . . . . . . Additive compatibility with the metallurgy of the lubricated component must also be considered. . . Good oxidation resistance. Different thickener systems can react with each other to modify . . . . . . the old grease with the new grease. . . . . . . The values measured include the yield stress, which can predict the hardening or softening the grease may undergo; the oscillation stress, which can give insight into the likelihood of oil separation and other effects; and recoverable compliance, which can help to identify those mixtures that might experience channeling or tunneling in the equipment housing. Upon observation, it becomes obvious that several of the charts are derived from the others. 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. . . . Thickener Compatibility Mixing of greases with incompatible thickeners can result in the most immediate and obvious changes that interfere with effective lubrication. A number of organizations rely on compatibility charts to make important maintenance decisions. . . . . Some charts listed polyurea grease as being compatible or borderline compatible with calcium complex, but another chart showed calcium complex to be incompatible with polyurea. How Can Lubrication Best Practices . . . . Refer to Grease Compatibility and Grease Lubrication Practices for more information on grease compatibility. . . . Contains no lead or nickel. . . . . . This leads to an oversight with compatibility issues. . . . . . . . . . . Grease consistence (hardness) labeling according to NLGI standard . . . . . It is up to you to determine the tradeoffs between grease costs and performance gains/losses. . 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. This is because of the wide variety of materials that can be reacted to form a thickener that is termed polyurea. . . . . . . . . Excellent high temperature performance. . . . . A common area for grease mixing is in new and rebuilt equipment. Table 5. . . . If you are a human seeing this field, please leave it empty. Some polyurea thickeners are completely compatible with lithium and lithium complex thickeners, while other polyurea thickeners are definitely incompatible with the lithium and lithium complex thickeners. . Any test that is designed for measuring grease performance may be used on a mixture of greases to determine the effect on that parameter when the greases are mixed. 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 mixture's dropping point is not significantly lower than the dropping points of the individual greases. In bygone days, when simple soaps and clay were the primary thickener types, compatibility was relatively straightforward. . . . . . . . . . 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. . . Metal Part Cleaning Basics This includes employees and contractors who may be working in the facility. . Do not overgrease a system. . . . ML 365 contains a lithium thickener. . . . . . . Calcium Sulfonate Calcium-sulfonate greases have superior mechanical and shear stability compared to lithium-complex greases. Figure 1. . . . 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. The goal was to consolidate to one product for all motors. . . . This mixture was chosen for a company looking to consolidate the number of greases in its facility. . . . . How to use a Grease Gun . . . . . It could be expected that the mixture may be subject to softening, oil separation and a tendency to channel when allowed to persist in a mixed state in the motor housing. If this can not be carried out, Table 1: Grease Compatibility Generic Chart NOTE: This matrix is based on information commonly used in industry. . . Deionized Water? . . . . . . . . . . . . . . . . . Thus, it is key you determine which thickener is best suited for use in your specific application Organic Soaps Mixed Soaps Complex Soaps The chart below summarizes the key characteristics of each thickener we have discussed. . 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. . . . . . . . This could mean that your grease is no longer the correct grade for the machine. . . . . . . . . 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. Finally, the grease is tested in a controlled stress rheometer to identify changes in flow and shear properties as compared to the original products. 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. . . . . . . . . . Sometimes, though, conditions dictate a change from one lubricant to another. . . . What Is MQL (Minimum Quantity Lubrication) . . . . Accurate Lubricants & Metalworking Fluids, Inc. 403 Homestead Avenue; Dayton, Ohio 45417 USA Phone: 937-461-9906 Fax: 937-461-9917 . . . Irritant Contact Dermatitis: How to . The three products that appeared in each of the tables were aluminum complex, lithium complex and calcium complex. . . . . . The remaining 10% to 20% of a finished grease is made up of thickeners and additives, both of which contribute to the . 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. . Compilation of 17 grease compatibility charts. Compatibility between greases is based on three factors: thickener type, base oil, and additives. . "Why Does This Sump Smell?" . . . . . . . 3. . . . . . . Lithium complex is the thickener that is most compatible with other thickeners. About | Select By Need | ACS Program | Tech Talks | Customers | News | Lubricant U | Literature | Sustainability | Careers. . . . . 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. . . . . . . . With Polyurea Greases we are talking about a specific type of thickener for lubricating greases. . However, these charts rarely tell the whole story, even just in terms of the thickener compatibility. . . . . . . . . New bearings, gears, motors, etc., often come supplied with a product that is incompatible with the grease being used to relubricate. . . . . . . . . . Excellent for antifriction bearings, wheel bearings, factory sealed ball bearings, and some flexible couplings. . . . . That is to say, the charts being used to make significant engineering and design decisions are contradictory and do not indicate the source of information or research used to compile them. . . . . Performance Benefits. . . . lithium complex. . . . . Managing the Turnover . Remember, this chart may not be accurate for all greases. . . . . . . . For example, one chart indicated that barium-complex grease is compatible with clay-thickened grease, while others suggested this mixture is incompatible. . . "Base oil type and viscosity are the most . . . . . . Choosing the Best Water Solution for Your Machine Shop: Is it Reverse Osmosis? 12-hydroxy stearic acid and hydrogenated castor oil added (the preferred ratio is 85:15 up to 50:50). . . . . . . polyurea-thickened greases. . . More Than List Price How Evaluating Synthetic vs. . . Table 3. . . . . . This test stand consists of the end bell from a 60-horsepower electric motor mounted with a ball bearing in a stub shaft. 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. . A typical grease compatibility chart is shown in Figure 1. . . Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. . . . . The short answer is, "No". . . . . In these situations, component damage is likely the result of the chemical or structural interaction between the thickener or additive systems of . . . Technological advances have made grease compatibility a much more complicated proposition with the wide and complex array of thickeners used. . I'm not sure I would trust data from Grainger. The following test results for binary grease mixtures were obtained using the previously described methods and the grease mixing test stand to mix and work the samples. . However, grease technology has changed significantly over the years, and there are many examples of performance that contradict several widely used compatibility charts. . . . . . . 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. . . . . . 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. . . . . . A total of 25 different product descriptions were found in the 17 tables. . I=Incompatible, C=Compatible, and B=Borderline. . . . . . . . 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.

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