Some mixtures will cause the thickener to release the oil, with the separated phase running freely from the bearing, gear or housing. Grease compatibility charts have been developed and circulated since the 1980s without much alteration. 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. Other mixtures harden initially and lead to component load issues and poor grease motility. How we choose grease and how you can evaluate which grease actually stands up to extreme environments. Some studies have been performed to improve the mixing and working of grease to better simulate machine conditions. These variations reveal an obvious formulation difference between the greases (most likely involving anti-wear additives), but this alone would not be sufficient to disqualify the mixture for compatibility if the resulting product still functioned effectively with regard to wear resistance. The data table below is an application guide, and indicates the . This compares to the 60 double strokes utilized to mix and work the binary mixture evaluated in the standard. Therefore, it is important to consider the type of base oil in the grease when determining compatibility. 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. If thickeners are considered compatible, be aware that similar grease may contain clashing base oil or … As an indication we have detailed the type of polymer we feel is suitable. The grease is also evaluated by elemental spectroscopy to assess unexpected final ratios of additives as compared to the anticipated averaging of values seen in the original products, adjusting for mixing ratios. The most common effect was substantial softening, however, lithium grease sometimes hardened. The head provides the additive’s properties, and the tail keeps it in the oil. Out of many conventionally available types of grease in the market, the best suitable candidate appears to be calcium sulfonate grease. This video outlines our process for how we choose grease and how you can best evaluate which grease actually stands up to extreme environments. Identify the minimum number of products required to meet the design of the equipment in use and consolidate to that number. Table 4 shows the rheological values for the two worked reference samples and the 50-50 worked mixture. Testing two common It is necessary to perform compatibility testing on combinations of these greases to determine whether the greases can be mixed in service. 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. 130-A & 130-AA are designed f. $154.66 . spray ISO Grade 320, Silicone fluid. However, the commonality ends there. Table 3. 000,00,0,1,2 and 3. The ability of this testing to adequately predict in-service mixtures may be reasonably questioned. 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. Grease Compatibility If possible, bearings should be thoroughly cleaned or purged prior to changing grease types. Source: Adapted from NLGI Lubricating Grease Guide Note: Grease compatibility studies have been done and the most incompatible were aluminium complex, calcium complex, clay and polyurea-thickened greases. This is because the charts from the various manufacturers often disagree with one another on certain thickener-type combinations. Performance o A lubricant grease formulated with highly-refined mineral oil and anhydrous calcium soap. Technical Report TR-60D (Rev. Anhydrous Calcium Calcium Complex Calcium Sulfonate Complex Clay Lithium Lithium Complex Polyurea Note: Greases of different thickeners should always be considered incompatible. Our products can be exposed to a huge variety of chemicals. So, which option is going to best for your application? Provide labels and color codes where possible to prevent confusion. *Coating Grease This chart is for reference only; it is intended as a starting point to determine whether two greases might be compatible. K57 GRAPHITED CALCIUM GREASE Description: K57 is a premium quality anhydrous grease enhanced with laminar solid lubricant for use in anti-friction and plain bearing applications as well as slides, valves and plungers. A typical grease compatibility chart is shown in Figure 1. The resulting mixtures are evaluated for changes in dropping point, shear stability and storage stability. *Buttery consistency. Although there is some mechanical working of the grease prior to testing, this is minimal mechanical perturbation. Recent research shows grease compatibility charts to be contradictory and dated. 252-39) Our invention relates to greases and more particularly relates to methods for the manufacture of anhydrous calcium grease. Additional testing might be warranted. The various descriptions used imply that some may have been copied from the others. 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. The melting or dropping point is usually around 120°C and can be used in areas where conventional calcium can not. Some synthetic base oils are incompatible with mineral oils and other types of synthetics, just as in the mixing of lubricating oils. 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. Once two greases are determined to be compatible in the above three areas, further testing to determine the impact on other performance parameters of the products may be warranted. *Water resistant. Lithium vs. Calcium Sulfonate Grease Explained. The data given should be used cautiously, and as a guide only. Selecting the best grease for a job requires narrowing down your choices by understanding what’s going to perform the best for your application. David Turner works for Shell Global Solutions Inc. and is the co-chairman of the National Lubricating Grease Institute’s technical committee. Typical properties of pure anhydrous calcium grease and the grease containing 3.0 wt % additives. Simply mixing two greases together to observe changes may not provide any obvious difference. ). 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. Excellent metal, rubber and plastic compatibility; VIEW DETAILS. 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. They offer minimal leakage and run-out during machine operation. 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. 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. Testing should be conducted to determine if greases are compatible. However, grease technology has changed significantly over the years, and there are many examples of performance that contradict several widely used compatibility charts. All personnel involved in applying grease to equipment should be trained and receive instruction on the proper product to use on each piece of equipment and the location. The electric motor test stand shown below was developed for the Electric Power Research Institute’s Effective Grease Practices guideline. CSC GREASE STRUCTURE Calcium sulfonate detergents, like many additives in the lubrication in-dustry, are composed of two parts, a hydrophilic head and a lypophilic tail (see Figure 1). This increases the likelihood of mixing. The penetration range at 77°F (25°C) is 265 to 295. Anhydrous Calcium Grease Applications o General purpose grease for normal loads and temperatures up to 120 ºC. According to most grease compatibility charts, polyurea greases are compatible with each other, and such a transition would be allowed. This generally allows for smooth operation of equipment. 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. The areas highlighted in yellow indicate values of concern. polyurea-thickened greases. Wladoil grease Activ CE is a very persistent grease suitable for the lubrication of vehicles, industrial, construction and agricultural machines. (Cl. The most common mixed soap grease is lithium/calcium as the lithium will improve the high temperature resistance of the resulting grease while the calcium improves the water washout and cost. Do not stock additional products for convenience or brand loyalty. It has a consistency similar to peanut butter. These last two parameters include measuring changes in the cone penetration value. Note: This chart is a general guide to grease compatibility. Bentone Greases. To add to the confusion, there are some grease specifications that are based solely on grease performance without regard to grease composition. To learn more about NLGI, visit www.nlgi.org. Not all application requirements are the same, and not all greases are suitable for every situation. Table 6. Use Grade 2 grease in normal bearing applications. By far the two most popular choices are lithium complex and calcium sulfonate grease (which we briefly spoke about). This includes employees and contractors who may be working in the facility. It is incumbent upon the user of the greases to verify compatibility when making a change from one product to another. Yes. Borderline – The properties of the mixture may or may not be acceptable, depending on the nature of the application. Lithium 12-hydroxy is incompatible with aluminum complex and calcium complex thickeners, but moderately compatible with calcium sulfonate, a typical marine grease thickener. Additive compatibility with the metallurgy of the lubricated component must also be considered. Grease Compatibility Chart Mixing greases in a system can cause issues with thickener systems reacting with each other. 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. Compilation of 17 grease compatibility charts. It has excellent water resistance, good mechanical stability, and its low temperature properties are also dependent on the mineral oil used. 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. >90. How to Determine Grease Compatibility and Why It's Important also provides an indepth look at grease compatibility. About the Author Excellent adhesion provides a high degree of impact resistance and reduces wear. The goal was to consolidate to one product for all motors. L0044-035 Confirmed After Ordering . Grease Bio M WR 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, 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. resistance of the specific thermoplastics we use in the construction of our products, to common chemicals. ∅) 19650 Pauling Foothill Ranch, CA 92610-2610 : Tel (949) 460-2100 Fax (949) 460-2300 Email: sales@balseal.com . Most greases are incompatible with lithium greases, except for calcium sulfonate grease. (Bottom) The expected and actual recoverable compliance values for the 50-50 mixture and the reference greases. It is interesting to note that these grease compatibility charts focus only on the family of thickener involved. A total of 25 different product descriptions were found in the 17 tables. Yes. Add to Cart. The shaft is turned by a fractional horsepower motor, coupled to a turned-down shaft. hbspt.cta.load(3951034, 'c99217f3-09e7-4751-bc3a-7739dac44a0e', {}); Product Unboxing - Simalube Single-Point Automatic Lubricators, How to Calculate Grease Quantity and Frequency for Bearings, 7 Steps to Trouble-free Grease Lubrication, Unboxing: Luneta Column Sight Glass in Tritan™, Unboxing: Mystik® JT-9™ LeakShield® AW Hydraulic Oil, Product Unboxing: Hy-Pro Compact Offline Filter, The Cost Effective Benefits of a High Performance Kidney Loop System, 8 Steps to Successfully Implement a Preventive Maintenance Program, How to Determine Grease Compatibility and Why It's Important. General Purpose Food Grade Silicone, 9.5 oz. 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. It exhibits excellent mechanical stability even in the presence of water and operates satisfactorily at temperatures as low as -40°F It exhibits excellent compatibility with the rubber used in the braker cylinder packing cups. Table 4. At the same time, lithium complex and lithium 12-hydroxy thickeners are compatible with each other. New bearings, gears, motors, etc., often come supplied with a product that is incompatible with the grease being used to relubricate. Grease compatibility is often confusing to grease users, even though most grease manufacturers produce compatibility charts. A number of organizations rely on compatibility charts to make important maintenance decisions. Chassis grease. The housing of the end bell is removed and replaced by a Plexiglas window to observe the condition of the grease under dynamic conditions. Table 2 shows the product information for both greases tested. Incompatible – The properties of the mixture are significantly different than those of the individual greases. Grease compatibility charts have been developed and circulated since the 1980s without much alteration. Sometimes, though, conditions dictate a change from one lubricant to another. This article will describe the most common examples of incompatible grease mixing and how to determine if two greases are compatible. These greases are very comparable based on their consistency and viscosity of the base oils. When mixing oils, the key considerations are the viscosity of each product, the base oil type and the thickener. >140. Likewise, when greases are mixed where the base oil viscosities are significantly different, the resulting mixture will not be optimized for the application. It is important to note that even if thickeners are generally compatible, two greases may … This potential effect is not easily determined. (Top) The expected and actual yield stress values for the 50-50 mixture and the reference greases Compatibility testing includes heating and holding grease for a specified time at assumed operating temperature for mixtures of 10:90, 50:50 and 90:10. Table 3 reveals the differences in elemental spectroscopy values for the reference greases and the 50-50 mixture. 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. In bygone days, when simple soaps and clay were the primary thickener types, compatibility was relatively straightforward. Mixing of greases with incompatible thickeners can result in the most immediate and obvious changes that interfere with effective lubrication. Therefore, it became necessary to verify that one polyurea grease could be added directly to a motor containing the other. hbspt.cta.load(3951034, '0185d019-b885-48b3-81bb-598c6269bb64', {}); Upon observation, it becomes obvious that several of the charts are derived from the others. Materials used in the pump and pumping systems must be chemically compatible. Table 1. In this case, each of the values for the 50-50 mixture is significantly different than the expected numerical average of the unmixed greases. -ZrP: -Zr(HPO4) H2O. 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. The three products that appeared in each of the tables were aluminum complex, lithium complex and calcium complex. CHEMICAL COMPATIBILITY CHART . Grease compatibility charts have been developed and circulated since the 1980s without much alteration. This demonstrates a change in properties due to mixing and raises concerns about this mixture’s performance in the long term. This underscores the challenge of finding a single authoritative chart to be used with confidence when making decisions regarding grease mixing. This is because of the wide variety of materials that can be reacted to form a thickener that is termed polyurea. The full text of ASTM D6185 is available from ASTM International at www.astm.org. Features: Good water resistance extends application intervals. Fortified with maximum strength antioxidant ; Thermally and oxidatively stable ; Zinc-free; VIEW DETAILS. 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. Elemental spectroscopy values for the reference greases and the 50-50 mixture. Figure 1. The areas highlighted in yellow show the contrast between the greases and evidence of mixing. Unfortunately, very few charts give any reference for the origin of the data or any research utilized to establish the compatibility relationships described. However, grease technology has changed significantly over the years, and there are many proven examples of performance that contradict several widely used compatibility charts. General purpose, low-load. A selection of 17 compatibility charts was recently evaluated for differences. EPDM . Table 1 shows the labels used in these charts and how many times these descriptions appear in the charts. 130-A & 130-AA are designed f . 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. 000,00,0,1,2 and 3. The usual processes … www.balseal.com : Spinozastraat 1 : 1018 HD Amsterdam . Grease Property Test Standard Base Grease -ZrP MoS2 Graphite Dropping point ( C) ASTM D 566 159 153 158 160 Cone penetration (0.1 mm) ASTM D 217 315 310 303 309 Wear scar diameter (WSD/mm) 1 ASTM D 2266 0.45 0.34 0.51 0.43 Maximum non-seizure load (PB/N) 2 ASTM D … 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). AAR Brake Cylinder Lubricant is an anhydrous calcium soap grease containing oxidation and corrosion inhibitors. CHEMICAL COMPATIBILITY CHART . The combination of sodium/calcium has also been used where the calcium improves the water resistance without lowering the operating temperature of the grease too much. 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. Chemical Compatibility for the following O-rings Elastomers: Ethylene Propylene, Fluorosilicone, Nitrile (Buna N), and Silicone. The resulting grease carries unknown performance characteristics (load, temperature stability, shear, etc. July 22, 2018. Chemical compatibility guide This chart is intended as a general guide and details the suitability of elastomers in various chemicals and fluids. The compatibility of polyurea greases with soap-thickened greases is probably the most debated area of grease compatibility today. Several contradictions were discovered among the various charts. Table 5. hbspt.cta.load(3951034, '0185d019-b885-48b3-81bb-598c6269bb64', {}); Lithium and calcium soaps were compatible with one another, and neither was particularly good when mixed with a clay-based grease. Unfortunately, it would not be possible to completely clean out all of the grease being replaced from the motors.
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