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Magnesium (Mg) -- element number 12 on the periodic table of the elements. In the context of oil analysis magnesium can be present as a contaminant in various sampled components and the origins can be from such sources as: oil additives, hard water and road dust just to name a few. Magnetic -- a separator that uses a magnetic field to attract and hold ferromagnetic particles. Magnetic filter -- a filter element that, in addition to its filter medium, has a magnet or magnets incorporated into its structure to attract and hold ferromagnetic particles. Magnetic plug -- strategically located in the flow stream to collect a representative sample of wear debris circulating in the system: for example, engine swarf, bearing flakes, and fatigue chunks. The rate of buildup of wear debris reflects degradation of critical surfaces. Manifold -- a filter assembly containing multiple ports and integral relating components which services more than one fluid circuit. Manifold filter -- a filter in which the inlet and outlet port axes are at right angles, and the filter element axis is parallel to either port axis. Media migration -- material passed into the effluent stream composed of the materials making up the filter medium. Medium -- the porous material that performs the actual process of filtration. The plural of this word is "media". Metal oxides -- oxidized ferrous particles which are very old or have been recently produced by conditions of inadequate lubrication. Trend is important. Micrometre (µm) -- See Micron. Micron -- a unit of length equal to one millionth of a metre or one 25,000th of an inch. Contaminant size is usually described in microns. Relatively speaking, a grain of salt is about 60 microns and the eye can see particles to about 40 microns. Many hydraulic filters are required to be efficient in capturing a substantial percentage of contaminant particles as small as 5 microns. A micron is also known as a micrometre, and exhibited as µm Microscope method -- a method of particle counting which measures or sizes particles using an optical microscope. Mineral oil -- oil derived from a mineral source, such as petroleum, as opposed to oils derived from plants and animals. Miscible -- capable of being mixed in any concentration without separation of phases; e.g., water and ethyl alcohol are miscible. Molybdenum (Mo) -- element number 42 on the periodic table of the elements. In the context of oil analysis molybdenum can be present as a wear metal in various sampled components and the origins can be from such sources as: alloy steel, rings, and extreme pressure oil additives just to name a few. Moly -- Molybdenum disulfide, a solid lubricant and friction reducer, colloidally dispersed in some oils and greases. Motor -- a device which converts fluid power into mechanical force and motion. It usually provides rotary mechanical motion. Multigrade oil -- an oil meeting the requirements of more than one SAE viscosity grade classification, and may therefore be suitable for use over a wider temperature range than a single-grade oil. Multipass or recirculation test -- filter performance tests in which the contaminated fluid is allowed to recirculate through the filter for the duration of the test. Contaminant is usually added to the test fluid during the test. The test is used to determine the Beta-Ratio (q.v.) of an element. myLab -- online oil analysis management software system designed by the Fluid Life Corporation. Naphthenic -- a type of petroleum fluid derived from naphthenic crude oil characterized by a high portion of cyclo-paraffinic structures and in some cases by the absence of wax molecules. Typically naphthenic base oils have exceptional cold temperature properties (low pour points) due to the lack of wax, however have a generally poor viscosity index. Needle bearing -- a rolling type of bearing containing rolling elements that are relatively long compared to their diameter. Neoprene rubber -- a synthetic rubber (chloroprene polymer) with excellent resistance to weather, oil, chemicals and flame. Neutralization number -- a measure of the total acidity or basicity of an oil; this includes organic or inorganic acids or bases or a combination thereof. Newtonian fluid -- a fluid with a constant viscosity at a given temperature regardless of the rate of shear. Single-grade oils are Newtonian fluids. Multigrade oils are NON-Newtonian fluids because viscosity varies with shear rate. Nickel (Ni) -- element number 28 on the periodic table of the elements. In the context of oil analysis nickel can be present as a wear metal in various sampled components and the origins can be from such sources as: hardened steels, stainless steels and plating just to name a few. Nitration -- nitration products are formed during the fuel combustion process in internal combustion engines. Most nitration products are formed when an excess of oxygen is present. These products are highly acidic, form deposits in combustion areas and rapidly accelerate oxidation. Nitrile rubber (NBR) -- synthetic rubber made by the copolymerization of butadiene and acrylonitrile. It resists heat, oil, and fuels. Also called Buna-N NLGI -- National Lubricating Grease Institute - trade association whose main interest is grease and grease technology. NLGI is best known for its system of rating greases by penetration. NLGI grades -- a simplified system developed by the NLGI for rating the consistency of greases. Nominal filtration rating -- an arbitrary micrometer value indicated by a filter manufacturer. Due to lack of reproducibility this rating is deprecated. Non-Newtonian fluid -- fluid, such as a grease or a polymer-containing oil (e.g., multi-grade oil), in which shear stress is not proportional to shear rate. Nonwoven medium -- a filter medium composed of a mat of fibers.
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