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