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Category Archives: Data Interpretation

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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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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Sources of Barium

Sources of Barium Barium was a detergent additive metal found in natural gas engine oils, but is no longer allowed in products manufactured in North America due to toxicity concerns Greases, though, continue to use barium in the form of a thickener system. Machines with greased seals or those having undergone recent maintenance may exhibit…
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Sources of Zinc

Sources of Zinc Zinc is an additive metal found in all anti-wear (AW) additive packages. Only when the zinc level deviates more than 25% from the new oil or reference value should a concern be raised, but the likeliest cause if mixing or topping-off with a different product. The zinc level in AW oils is…
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Sources of Phosphorus

Sources of Phosphorus Phosphorus is an additive metal found in all anti-wear (AW) and extreme pressure (EP) additive packages. Only when the phosphorus level deviates more than 25% from the new oil or reference value should a concern be raised, but the likeliest cause if mixing or topping-off with a different product. AW oils can…
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Sources of Magnesium

Sources of Magnesium Magnesium is an additive metal commonly used in detergent additives. Only when the magnesium level deviates more than 25% from the new oil or reference value should a concern be raised, but the likeliest cause if mixing or topping-off with a different product. With normal and expected additive depletion due to usage,…
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