2 is Cenex's Poly-Xtreme, a high-temperature polyurea grease. . . . 3. . The thickener defines the type of grease (see Fig. . . . . Maintaining Gear Box Lubrication . . . lithium 12 hydroxy. More than 90% of the thickeners used worldwide are soap based. . . . . Grease compatibility can be confusing to those who have to maintain equipment correctly even if most of the manufacturers can produce compatibility charts. . . Grease compatibility charts (such as the one pictured below) can only help compare the thickener types of greases. A common area for grease mixing is in new and rebuilt equipment. 2017 by Accurate Lubricants & Metalworking Fluids, Inc. located in Dayton, Ohio U.S. All rights reserved. . The upper operating limit for a grease is usually recommended to be 100-150F lower than the dropping point. . . Grease compatibility and conversion guidance Tech topic Key insight Compatibility testing enables users to make informed decisions when converting from one grease to another. . . lithium. . . . . . . of Metalworking Fluids Thoroughly Clean Those Coolant Systems! . . If this can not be carried out, Table 1: Grease Compatibility Generic Chart NOTE: This matrix is based on information commonly used in industry. . . . The compatibility of greases is most often related to the thickener type. . 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. . . Excellent for antifriction bearings, wheel bearings, factory sealed ball bearings, and some flexible couplings. Likewise, when greases are mixed where the base oil viscosities are significantly different, the resulting mixture will not be optimized for the application. . . . Finally, the grease is tested in a controlled stress rheometer to identify changes in flow and shear properties as compared to the original products. . Incompatibility of thickener systems, which is the most commonly asked question. . 3.2.5. . . Reduce Your Environmental Footprint? . . . Mixing greases in a system can cause issues with thickener systems reacting with each other. . . Table 3 reveals the differences in elemental spectroscopy values for the reference greases and the 50-50 mixture. . . . . . polyurea. . Table 1: Grease thickener compatibility . . A selection of 17 compatibility charts was recently evaluated for differences. . . . . Therefore, it became necessary to verify that one polyurea grease could be added directly to a motor containing the other. . 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. However, these charts rarely tell the whole story, even just in terms of the thickener compatibility. . . 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. . . . Contact Us: 1.800.404.2570 or email us at sales@acculube.com, Think Twice Before Changing . . . It is up to you to determine the tradeoffs between grease costs and performance gains/losses. How Can Lubrication Best Practices 3.2.4. . . . . . . . . . See the above example for composition or formulation. . What Is MQL (Minimum Quantity Lubrication) Mixing incompatible greases in your machine can have major consequences. The resulting grease carries unknown performance characteristics (load, temperature stability, shear, etc. . . Note: The compatibility charts should be used as a reference only.Compatibility testing is the only way to verify compatibility. . . 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. Also, while lithium thickener remains the most prolific, a greater variety of other thickeners are becoming available due to lithium demands for batteries. . . . Many mixtures will initially soften, often to the point of migration through seals or away from lubricated surfaces. . . . . . . . Compatibility of grease mixtures is typically categorized as follows: . . Why is a Breather Filter Important? . . Compatibility testing is the only way to verify compatibility. . . . This mixture was chosen for a company looking to consolidate the number of greases in its facility. . Shows also excellent performance in combination with hot water . . . . 1. In some cases, dissimilar thickener types are combined in a grease. . . . . . Good chemical resistance. Grease No. . . . Electric . . . . . Lubricant Contamination Control Helps Prevent Varnish Formation in Machine Shops . . . . . . . . . This table is to be used as a reference only. . . . . . . . . . . . Grease labeling according to ISO standard . 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. . . Contains no lead or nickel. Most grease suppliers have data on certain grease combinations or are willing to perform the required testing for their customers. Conventional Oil Can Add or Subtract From Your Bottom Line As such, to verify whether two greases are compatible or not, Machinery Lubrication developed a Compatibility Chart based on thickener type. Two greases are considered incompatible when these properties or performance criteria are substantially inferior to both of the unmixed, constituent grease. . . 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. Different thickener systems can react with each other to modify . . . . . . . . . Forgive my grease illiteracy. . Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. . . . . . . However, the commonality ends there. . . . . . . . . . . . . . . . . Can a Lubrication Audit Show Us How to "Why Does This Sump Smell?" . . . . . . . Soap-based thickeners are produced from an acid base reaction. . . . to Lubricate Plain Bearings? . . . . . . . Use Fewer Lubricants, and Save Costs? 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. . 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. . . Compatibility between greases is based on three factors: thickener type, base oil, and additives. . . . . . . . . . . NLGI 3 grease has a semi-solid appearance and is a common lubricant in automotive, industrial, marine, and agricultural applications. . Maximize Fluid Performance . . . . . . . . . . . . Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. . . . . . . "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. When changing to a different oil, it is typically an option to discharge and change fluids completely. . . . . . . . . . . . Technical Help Desk 6 Jun 2017. . Consistency of the mixture following temperature elevation is comparable to the change in consistency of the individual greases under the same conditions. . . . 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. . . Compilation of 17 grease compatibility charts. . 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. . . . 5.2 There are two approaches to evaluating the compatibility of grease mixtures. . . . . Low noise. They are finding that the greases they have been using for years for on-highway, off-highway and industrial applications are in short supply. . . . . . . . . . . . . . . . . The base oil lubricates, reducing friction between moving surfaces; this is exactly the same role that the base oil plays in a lubricant oil. . . . . . 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. . . . One area of the facility used a particular grease in all electric motors, while the remainder utilized another grease. . . . This type of thickener system can be referred to as a hybrid thickener or in some cases as a complex thickener. . Testing should be conducted to determine if greases are compatible. In bygone days, when simple soaps and clay were the primary thickener types, compatibility was relatively straightforward. . 2). . . . . The goal was to consolidate to one product for all motors. . . . . . . New bearings, gears, motors, etc., often come supplied with a product that is incompatible with the grease being used to relubricate. . . . . For Commercial Greases . . . . . . Calcium Sulfonate Calcium-sulfonate greases have superior mechanical and shear stability compared to lithium-complex greases. . . . . . . . . Mixing different greases, even those with similar thickener types, can lead to ineffective lubrication and result in component damage. . Long bearing life Outstanding thermal and oxidation stability. . . . . . . Deionized Water? . . Some thickeners need to be non-melting and withstand temperature significantly hotter than what traditional soap greases can handle. . . Valves, packings, seals & O-rings. . . . . . . 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. . JavaScript seems to be disabled in your browser. . . . . . . 3.3.2. . . . . . . For example, one chart indicated that barium-complex grease is compatible with clay-thickened grease, while others suggested this mixture is incompatible. . . TOYO GREASE recommends that all grease be removed from the application prior to changing greases. . . . . Figure 1. . Even so, those charts have their limitations. . When the base grease is the same, the name of the grease can be similar, but the two will not be identical; the thickeners can react with each other even if they are made by the same grease manufacturer. . Grease suppliers typically advise their customers to purge as much of their grease as possible through the grease-dispensing system and application to displace the previously used product. 12-hydroxy stearic acid and hydrogenated castor oil added (the preferred ratio is 85:15 up to 50:50). . . . . . 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. Hydraulic System Maintenance . . . . Thickener compatibility: Typically, grease lubricants are 70% to 90% finished grease and 10% to 20% thickeners. . with Optimal Water Quality . . Grease compatibility problems may be immediately apparent in observable changes to the lubricant. . . . . grease. . Don't Waylay Your Machine Tools with the Wrong Way Oil . . When mixing oils, the key considerations are the viscosity of each product, the base oil type and the thickener. . The mechanical stability of the mixture is within the range of consistency of the individual greases. . The Grease Compatibility Charts found in company and . 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. . . . . . This is then run for 72 hours to achieve the 30 million plus perturbations of the grease. Compatibility between greases is based on three factors: thickener type, base oil, and additives. . . However, grease technology has changed significantly over the years, and there are many . . . . This test stand consists of the end bell from a 60-horsepower electric motor mounted with a ball bearing in a stub shaft. Thickener Compatibility Mixing of greases with incompatible thickeners can result in the most immediate and obvious changes that interfere with effective lubrication. Provide labels and color codes where possible to prevent confusion. . Good oxidation resistance. . . 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. . . . . Vibratory Finishing Basics Therefore, when changing grease products, grease compatibility is critical. Common non-soap thickeners include polyurea, organophilic clay, fumed silica, fluoropolymers, and others. . sultan full movie watch online free dailymotion; ge dishwasher opened mid cycle 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 is a di-urea bearing grease, which has successfully been tested for compatibility with lithium and lithium complex thickened greases i.e. . . . . 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. . . . and the proportions in which they are mixed. Vacuum pumps. . Food Grade Lubricants |Biodegradeable Lubricants | Industrial Lubricants Store | Contact 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. . . . . . . Grease Compatibility Chart Mixing greases in a system can cause issues with thickener systems reacting with each other. . . . . Therefore, it is important to consider the type of base oil in the grease when determining compatibility. . 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. . . . . . . In these situations, component damage is likely the result of the chemical or structural interaction between the thickener or additive systems of . . A total of 25 different product descriptions were found in the 17 tables. . . . . . However, the unreliability of these charts and the complex interaction of base oils, additives and grease thickeners require that a more certain approach be employed for optimal equipment performance. . . . . . . . There are three typical grease thickeners used in grease lubricants, including: The mixture's dropping point is not significantly lower than the dropping points of the individual greases. to Prevent Rancidity . . Remember, this chart may not be accurate for all greases. Grease compatibility is a straight forward concept when armed with the correct knowledge. Some mixtures will cause the thickener to release the oil, with the separated phase running freely from the bearing, gear or housing. . . . 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. . 3.3.1. The most likely result is a change in consistency or increased oil bleeding, especially under shear stress. . . Simple soaps are the most . The rheological values for the two worked reference samples and the 50-50 worked mixture, with the values of concern in yellow. Grease compatibility charts have been developed and circulated since the 1980s without much alteration. The resulting mixtures are evaluated for changes in dropping point, shear stability and storage stability. . . . Soaps can be grease thickeners, while non-soap thickeners include polyurea, organophilic clays (e.g., bentonite) and other materials. . Polyurea greases are also characterized by dropping points above 250 C and low oil separation. If those properties of the mixtures compare favorably to whichever of the individual greases performs worse, they are considered compatible. Why is Oil Testing Important for New Oil? How to make grease: The process to make anhydrous calcium soap grease. . . . . 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. . These last two parameters include measuring changes in the cone penetration value. . . . . . . . . . This article will describe the most common examples of incompatible grease mixing and how to determine if two greases are compatible. . . 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. . . The remaining 10% to 20% of a finished grease is made up of thickeners and additives, both of which contribute to the . . . . 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. High load-carrying capacity. 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. . . . . and Save Money? . . You also need to consider the operating conditions of the grease (temperature, sheer rate, etc.) . . Grease consistence (hardness) labeling according to NLGI standard . . . . In order for a grease to change state, one thing that has to happen is the soap matrix needs to break down, to degrade. . . . . . However, grease technology has changed significantly over the years, and there are many examples of performance that contradict several widely used compatibility charts. . . . . . . . . . Thickener Compatibility Mixing of greases with incompatible thickeners can result in the most immediate and obvious changes that interfere with effective lubrication. . Best Practices for Mixing . . . 3. . . Wide service-temperature range (-45C to 180C; for short periods up to 200C) Suitable for very high rotational speeds (DN value 750,000) Good oxidation . . . . Greases are not created equal - there are dozens of options to choose from, each type is designed to work better in a specific application. . . . . Lubrication grease is a mixture of oil and soap or another thickener. This kind of lubricant is just perfect for dealing with compatibility. . . . . . . . . . . Excellent resistance to water, chemicals, and high and low temperatures. The use of incompatible greases can result in numerous machine performance issues and cause costly repairs. . . . . . Particulates in Cutting Fluid -- A Fine Mess. This is because the charts from the various manufacturers often disagree with one another on certain thickener-type combinations. . Do not stock additional products for convenience or brand loyalty. . Grease of #2 consistency rated GC (for wheel bearings) and LB (for chassis) is good. . . from every lubricant and other critical fluid you buy, and avoid the common pitfalls that can cost you money. . . (Bottom) The expected and actual recoverable compliance values for the 50-50 mixture and the reference greases. . . But thanks to the polyurea thickeners that are far better than any lithium-complex grease. . . . . . Back in the old days, they used simple soaps and clay as the most common thickeners, and compatibility was easy to determine. Grease Compatibility Matters . . . . It is wear resistant for use in a wide range of bearings.. NLGI viscosity grade is a rating of a grease's consistency. . . 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. . A significant portion of grease lubrication failures can be attributed to mixing greases in a system without taking into consideration compatibility. . Excellent high temperature performance. . . If you are a human seeing this field, please leave it empty. This document details the procedure for evaluating the basic compatibility of greases, which is determined by measuring the dropping point, the mechanical stability and the change in consistency of the mixture upon heating.
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