Grease penetration test

We use cookies to make our website easier to use and to better understand your needs. In cases where equivalent SI conversions are not known, notes are added for clarification. The extremes, when compared in stress measurements, have differences in stiffness of percent from the high to low end of the NLGI 2 grade. Unworked - A sample that has received only minimal disturbance in being transferred from the sample can to the test cup. Base Oil Grease is formulated with up to 95 percent base oil. The magnitude of the G stresses measured for each grease was so different that an argument could be made that the greases were not the same and might be best suited for different applications. However, no regulations currently exist regarding this issue.
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Particle Quantifier Index

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Motorized Grease Worker (Double Cup) - ASTM D217

Too much water in grease may cause corrosion and bearing damage. Unlike AES, which cannot easily detect iron particles greater than 5 microns, the PQ index records all the wear particles that are magnetizable regardless of their size. Log In Sign Up Forgotten your password? Typically, a few milligrams of the sample is weighed and heated under controlled conditions. The cell is heated and pressurized with oxygen. A simple test for water resistance involves placing a thin layer of grease on a strip of glass.
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ASTM D - 17 - Standard Test Methods for Cone Penetration of Lubricating Grease

Percent Change For some tests, such as oil versus gelling agent, it is more appropriate to set values on a percentage change rather than standard deviation. Whether your business is local or global, we can ensure your products meet quality, health, environmental, safety, and social accountability standards for virtually any market around the world. Typically, a few milligrams of the sample is weighed and heated under controlled conditions. There are a number of ways to determine the presence of contaminants in a used grease sample. But how much do you know about the grease or greased bearings in your plant? The consistency of grease is controlled by the type and ratio of the gelling agent to the oil and its viscosity. By measuring the onset of the reaction in the used grease commonly called the induction point in reference to the new grease, an estimate of the oxidation stability of the grease can be made Figure 3.
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The grease was then trimmed to ensure an even edge with no undercutting of the sample. Not only can a rheometer be used to replace an arguably outdated industry test and with less sample and mess than cone penetration, but it can also be utilized with a variety of test methods to learn more about a grease. Trend Performance or Rate of Rise Setting alert values based on the rate of rise of the data, or on the slope of the curve, for a specific wear metal above a predetermined minimum threshold value can be accomplished after the initial three sets of data are entered into the database. The National Lubricating Grease Institute NLGI has established consistency numbers or grade numbers from to 6 that correspond to specified ranges of penetration numbers. A low PQ index less than 50 accompanied by a high AES iron value more than is always a sign of corrosion and rust formation.
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