Testing by major grease and bearing manufacturers reveals some grease types are . 22490. It is necessary to perform compatibility testing. The product loses the ability to . Calcium sulfonate greases exhibit greater shear stability than lithium complex greases. lubricant grease Gadus S2 OG 40. synthetic polyurea for gears. For example, a John Deere owner's manual might call out a John Deere Multi-purpose SD polyurea grease or a John Deere HD Lithium Complex grease as the preferred choices. Complex greases are made by a combination of alkali metal/metals with more than one fatty acid. The Lithium Grease consists of a thickener, performance additives, along with base oil. with petroleum ether and a mixing of grease and the organic solvent was promoted by 2.Cleaning the parts of lubrication before using, don't mix using with other grease. Measuring the residual amount of anti-oxidants exiting from the bearing, it can be determined if the re-greasing interval is . Grainger has been out of Polyrex EM for quite some time and I'm down to my last couple of tubes. 2017 John Deere x758 w/54" HC mower, FT mulch kit, 14bu powerflow, 4-way QH, FM . It is necessary to perform compatibility testing. Lithium Based Grease. calcium, lithium and polyurea. . This article will describe the most common examples of incompatible grease mixing and how to determine if two greases are compatible. You should come to know why people use such grease made of polyurea. 05 Jun. I would avoid mixing them if possible. However, lithium greases hardened in some mixtures, as did some clay mixes. 6/27/068:30 AM ️ 0 R rolandpaul Member In case of doubt or additional mixtures not mentioned in it, please consult an SKF application engineer. The grease can also help to reduce wear and friction. When talking high speed applications and not using moly, one needs to realize high speed means 10,000 RPM or more. One uses blue waterproof grease on all the zeros and the other one uses another amber grease (not polyurea or lithium complex). The total worldwide lubricating greases market size is about 2.48 billion pounds consisting of lithium/lithium complex, calcium, aluminum/aluminum complex, calcium sulfonate, clay base, polyurea, etc. It is a di-urea bearing grease, which has successfully been tested for compatibility with lithium and lithium complex thickened greases i.e . Based upon the latest Machinery Lubrication magazine article "Recommendations for Mixing Greases" is says that what you have mixed now is incompatible. Undoubtedly the best one would be which grease material is from polyurea. 1) SKF high performance, high temperature bearing grease LGHP 2 is not a common polyurea type grease. But the two greases are incompatible. 1. Compatibility of grease mixtures categories Compatible The properties of the mixture are similar to those of the individual grease. The benefits are shown below: polyurea vs lithium grease. For example, you might have heard molybdenum or marine grease is better than multi-purpose grease, so why not just use that the next time you get a new grease cartridge? If there is a little oil impregnate, blend it before using." . When this happens, the base oil can no longer stay in place and you get a messy situation - oil oozing or running out of the area where it was applied. Do not apply it if you previously lubricated your equipment with lithium complex or lithium grease. However, lithium greases hardened in some mixtures, as did some clay mixes. A polyurea is normally used on motor bearings. So the winner is Lucas xtra heavy duty grease. Lithium Stearate Lithium 12 Hydroxy Lithium Complex Polyurea Silica Gel Sodium Soap; Aluminum Complex: n/a: I: I: I: I: C: I: B . This can change the physical and chemical structure of the grease, causing an inability to hold or release the base oil. This is especially dangerous because softened grease can run out of a bearing. May 17, 2016 #7. Polyurea greases provide load-supporting capability without degrading the thermal stability of the grease at high temperatures. Lithium complex is the thickener that is most compatible with other thickeners. The most common effect was substantial softening, however lithium grease sometimes hardened. Grease MonkeyNov 29, 2019. 2. Grease that appears milky may indicate water contamination. Most grease suppliers have data on certain grease combinations or are willing to perform the required testing for their customers, but the . Grease Material Type. In the automotive industry it is commonly used as a lubricant in wheel bearing and chassis applications. 5. There are only a few other thickeners that are not compatible with lithium complex, when using one of the Graco greases. Note: Marine grease is not compatible with white lithium grease. Lucas Marine Grease is a premium, extreme pressure, multi-purpose, heavy duty OBCS grease containing unique . Lithium complex grease, is the most widespread choice in the marketplace. Lithium based grease adheres to metal very well, has a high heat tolerance, and is water resistant making it another possibility for use with polyurethane bushings. The additives in some greases do not mix well and can cause the grease to . I would recommend purging the grease as a first step, however it may require a disassembly and cleaning before you can fix the mistake. The plateau moduli of the greases were calculated, and the mechanism of influence of consistency and temperature on the rheological properties of the greases was explained. . We have already told you the two different types of material one is a polyurea and another is lithium. Polyurea greases have a tendency to have very good water resistance, top mechanical stability and might exhibit . Its always best to clean out and replace as much as possible when switching greases. Compatibility of grease mixtures is typically categorized as follows: Compatible - The properties of the mixture are similar to those of the individual grease. 2 rating. Polyurea and Lithium don't like each other, when mixed, the grease can become pure oil and flow into the motor, leaving no lubrication for the bearing. With such a wide . Maintenance Tip article by Paul Murray. Compatibility has a lot to do with which thickeners are used in the greases. Lubrication separates rolling surfaces to reduce wear, removes excess heat generated by friction, acts as a barrier to contaminants, provides corrosion inhibition, and helps retain rolling elements during assembly. . After multiple discussions with Shell, Mobil, Texaco, and other large grease manufacturers, the consensus became clear: there should be no mixing of greases - ever. Most difficult to use in mixtures were aluminum complex, calcium complex, clay, and polyurea thickened greases. Additionally, if different greases are mixed in service, the resulting color may be a mix of the two. the two greases are miscible; The grease mix hardens, which can be devastating in, say, a central lubrication system; The grease mix softens. Mixed with a lithium or lithium complex it will more than likely cause a change in viscosity, and degrade the lithium based grease's reversability. Thickeners are molecules, polymers, or particles that are partially soluble in lubricating fluid; they arrange themselves in such a way that they impart a semi-solid consistency to the grease. Wheel bearings are not high speed. They keep recommending various lithium based greases as alternatives. U-joints are not high speed. As the various thickening agents interact, they might lead to grease hardening or oil dropout. The grease is then manufactured by solubilizing the powder at the desired . The first group is comprised of thickeners that undergo a chemical reaction to form the thickener, such as calcium sulfonates and polyureas. The portion of the grease that determines the compatibility is the thickener. It also is used lots in sealed bearing housings. This is especially dangerous because softened grease can run out of a bearing. These lubricating agents are basically oil mixed with lithium soap, usually with several additives. SHC Polyrex greases are compatible with many polyurea and lithium greases, although mixing may detract from their performance. Usually, substantial softening occurred when greases were incompatible. In the Maintenance Instructions brochure manufacturer mentionned that the motor are pregreased with polyurea mineral oil and it's compatible only with specific type of grease. Usually, substantial softening occurred when greases were incompatible. The thickener in a lubricating grease is the component that sets grease apart from fluid lubricants. It demonstrates excellent water resistance and high temperature . This is also called a hybrid thickener. One checklist I saw said polyurea conventional is not compatible but shear table version is. Different thickener systems can react with each other to modify the physical and chemical structure resulting in the inability to hold or release the base oil. Mixing greases in a system can cause issues with thickener systems reacting with each other. By far the most popular greases worldwide are lithium base greases with a market share of more than 75 percent. I have found a chart that shows lithium complex grease and shear-stable grease as compatible. In either case, your bearings, shafts, joints or other moving parts could be left unprotected, open to corrosion, prone to wear or apt to complete failure. Mixing incompatible greases can have dire consequences. Lithium complex grease works well with most other greases except bentonite clay, barium complex, and conventional polyurea. Aluminum . A polyurea-based grease is an excellent grease for electric motors; however, this thickener is incompatible with most other thickeners. Lithium grease is the most commonly used lubricating grease around the globe - accounting for 75% of lubricating applications across all industries. Mobil Delvac Xtreme is an extra high performance EP grease . It's been common knowledge not to mix lithium and polyurea grease. Some manufacturers don't recommend mixing one brand of polyurea . For calcium sulfonate grease, it is not uncommon for their scores to change by less than 20 units. Sodium grease is formulated by mixing soda soap with additives and base oils. Grease compatibility (See Table 1). The rheological properties of lithium grease and polyurea grease at different temperatures and consistencies were determined with a rotary rheometer. Such mixture provides solid shear stability, high dropping point, excellent rust protection, and good lubrication, but has poor water resistance and oxidation stability. thickener, base oils and additives yields a grease with excellent load carrying capabilities and rust protection. Incompatible - The properties of the mixture are significantly different than those of the individual greases. The reason being, some polyurea thickeners are completely compatible with lithium and lithium complex thickeners, while others are incompatible. A number of things can happen when two different greases are mixed: Nothing, i.e. of the grease. Non-soaps are split into two main categories. It is quite easy for a plant where strict guidance is not given or Below that will be a comment that says if not using the preferred greases to be sure to use a general all-purpose grease with an NLGI grade No. These powders are generated by solvent extraction of the base oil from the polyurea thickener formed in the first manufacturing step. Lubrication grease is a mixture of oil and soap or another thickener. Polyurea grease us a range of greases with a polyurea thickener, particularly adapted to high temperatures and high speeds . Even if it means a few extra purge cycles. Follow We used Unirex ep grease for our motor and fan bearing and unirex is lithium base. Mobil Delvac Xtreme Service Lithium Greases . This depends on whether the thickener and/or the base oil can mix with each other. Besides, it can offer you long-term performance and ideal for high load-bearing applications. There are many types of grease, but can you mix grease? Proper bearing lubrication is key to keeping your motor running correctly. Lithium : 1: 1: 1 : 1: 1 . Don't Mix Grease, but Change If Needed A significant portion of grease lubrication failures can be attributed to mixing greases in a system without taking into consideration compatibility. 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. A NLGI 2 grade grease is the most commonly used in electric motor applications. Even using moly in motor oil is common. Many major motor oil brands have some moly in them, as does the Schaeffer I use. The most incompatible were aluminum complex, calcium complex, clay and polyurea-thickened greases. The reason being, some polyurea thickeners are completely compatible with lithium and lithium complex thickeners, while others are incompatible. Recently, polyurea grease manufacture has been simplified by the use of commercially available polyurea powders. . Polyurea Grease Polyurea is a multi purpose grease that is well suited for long-service use. Types of Wheel Bearing Grease Calcium-based grease has high water resistance but only moderate heat resistance. The Lithium Grease is a high viscosity formula that is not going to drip or run. Soap thickened greases consist of simple, mixed and complex soaps. Alternative grease. Most difficult to use in mixtures were aluminum complex, calcium complex, clay, and polyurea thickened greases. In our manuals, as well as many others out there, the section about lubrication states: "mixing of greases should be kept to a minimum.". Complex soap thickener. Additionally, what is the difference between . Perhaps one of the most common inadvertent mixing of greases occurs when a Lithium Complex grease, commonly specified or used as a factory fill in bearings in fans and pumps, meets up with a Polyurea grease, often used in electric motors. Considering this, what is the best grease for electric motors? The Shell Gadus ranges include multipurpose greases that can help to simplify your product inventory, as well as speciality greases, including advanced polyurea synthetic products designed . What's you take? Properties of Lithium Grease and Polyurea Grease with Different Consistencies. They tend to be very temperature tolerant, non-corrosive and adhere nicely to metal surfaces. Lithium complex and calcium sulfonate grease both have the advantage of being compatible with each other and many other types of conventional grease lubricants. 1) Lithium greases, or soap-based greases - white in appearance and comprised of fatty acids and salts. Figure 12 shows the average value of th ree friction experiments. PU greases generally perform acceptably for low to medium boundary applications such as yours NO HAND eyeofthetiger Joined Nov 18, 2017 Messages 768 Location South Carolina Jul 5, 2020 #6 After multiple discussions with Shell, Mobil, Texaco, and other large grease manufacturers, the consensus became clear: there should be no mixing of greases - ever. A typical grease compatibility chart is shown in Figure 1. 0. polyurea vs lithium greaseomaha steaks potatoes au gratin copycat recipe . In our manuals, as well as many others out there, the section about lubrication states: "mixing of greases should be kept to a minimum.". Viscosity: 0.00004, 0.000655 m²/s. Inquiry More. The JD writeup says "Compatible with most other types of grease" but no mention . We did a project last year and installed 20 new motors. Every grease was incompatible with at least one other grease. They may react together and cause a separation of the base oil or oils from the thickeners of the two greases. The second group is a dispersion of particles in oil that includes silica, organo-clays . Safe to say that I won't be letting either one touch my machine as they aren't using the grease that is recommended per the tech manual. "They can cause each one to lose their oil and dry out," said Hamilton. Lithium and polyurea greases cannot be mixed. The only classes that are incompatible with a lithium complex and calcium sulfonate grease are traditional polyurea-based grease and bentonite clay grease. If your grease undergoes color change while in service, it could be an indication that it has reached or is almost at its condemning limit. Extreme Pressure Lithium Base Grease. #Lubricants. Is lithium complex grease compatible with calcium sulfonate? Due to its drawbacks, sodium grease is now mostly used for lubrication of rolling contact bearings. The most common grease used by maintenance departments has a lithium base. 2) Polyurea greases - byproducts of resin compounds, amines and isocyanate. I was under the impression hat mixing lithium base with polyurea base was a no-no. Mixing grease, though, could be disastrous. The tribological and wear properties of the two greases were measured by . Coatings 2022, 12, 527. . These thickeners have an advantage over simple soap because of their better high-temperature properties. These greases exhibit a median life of about three to five times better than the lithium based greases. Lithium-based grease is water resistant and has a high tolerance for extreme temperatures. fashion internships in miami for high school students soles for christ clothing northwest laporte hospital. Oxidation (5) - The onset of oxidation can be measured with several tests. 07430 960994, paul keith davis married amy thomas, park homes for sale knowle sands, bridgnorth santiniketanpolytechnic@gmail.com calcium sulfonate grease Posted on 5 June, 2022 at 8:14 pm by The end result The test results are shown in Figure 1. Mixing incompatible lubricants may result in the separation of base oil and additives. Normally a synthetic base, long laster. lithium grease and polyurea grease on bearing steel/c arbon steel friction pairs were meas- ured. Maintenance Tip article by Paul Murray. #food grade lubricants. And that means they will hold up under pressure, for longer, than lithium greases. More than 50% of all bearing failure is due to . I only have the top of the line JD Polyurea (not much more than the others) and purchased a chipper that made a comment about polyurea and lithium greases incompatibilitu. These are the most common thickeners used in grease. 1295/1297 4051 1498/1499 1298/1299 4622 5180/5182 4070/4071 4072 This mixture makes for much higher tolerance to heat for longer . Mixing of polyurea and lithium complex grease caused the oil to run out of the grease leaving only the thickeners to do the lubricating. . That 280 Grade 2 grease may only change to a score of 295 or 300 instead of 310. Lastly, white lithium grease is a multipurpose grease that resists corrosion and repels water. Marine Grease . Operating temperature: 40 °C - 100 °C. Lucas Heavy Duty Mining and Construction Grease is a smooth, dark gray, lithium complex grease fortified with 5% molybdenum disulfide to provide excellent shock loading protection in the most adverse operating conditions. Many different types of chemical compounds can be . Most grease suppliers have data on certain grease combinations or are willing to perform the required testing for their customers, but the . One of the additives commonly used in lithium grease is .

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