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Sources of Chromium

Sources of Chromium
Sources of Chromium Chromium is a wear metal found in the coating of parts like valves, rods, rings, and bearings. Typically, increasing levels of chromium, and possibly nickel, disproportional with iron, indicate coating wear, whereas proportional increases suggest steel alloy wear. One form of proportional chromium and iron increase may arise from non-wearing parts made…
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Setting Acid Number and Base Number Limits

Setting Acid Number and Base Number Limits
Setting Acid Number and Base Number Limits There is a rule-of-thumb that oil should be condemned at double its new oil Acid Number, or at half of its new oil Base Number. The problem with this rule is that is has too many exceptions to be valid. Rather than identify the valid instances, it is…
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Sources of Molybdenum

Sources of Molybdenum
Sources of Molybdenum Molybdenum is an additive metal commonly used in friction modifier additives. Only when the molybdenum level deviates more than 25% from the new oil or reference value should a concern be raised, but the likeliest cause is mixing or topping-off with a different product. This type of friction modifier is found in…
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Understanding MPC Results

Understanding MPC Results
Understanding MPC Results According to ASTM test method D7843, Membrane Patch Colorimetry (MPC) is intended to serve as a “guide to end-users on the formation of lubricant-generated, insoluble deposits”. The issue, however, is that the results do not seem straightforward. Fundamentally, MPC is measure of the insolubles found dissolved or suspended in the fluid, and…
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What Failed Demulsibility Results Mean

What Failed Demulsibility Results Mean
What Failed Demulsibility Results Mean Demulsibility, or more correctly, water separation, is a measure of a lubricant’s ability to separate from water. Lubricants and water have a natural tendency to separate because most basestock molecules are non-polar, while water molecules are polar and will seek each other out instead of mixing with the basestock. Water…
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Sources of Silicon

Sources of Silicon
Sources of Silicon Silicon is commonly identified as a contaminant, either from dust or dirt, which must be understood to be completely different types of contaminants. Dirt has a different chemical composition than dust, though they both are silicon-based. Dirt is also made up of aluminum, with a ratio of around 3-4 times more silicon…
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