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