Whether thin or thick, the viscosity of a modern lubricant is accurately adjusted nowadays to suit its intended use. The viscosity of this paste was, however, altered in Roman times, for example with honey. “Viscous” therefore originally meant “sticky like birdlime”. Glue used to be extracted from the mistletoe for catching birds. The concept takes its name from the typically gooey sap that comes from mistletoe berries (viscum). Nearly all physical media and foodstuffs have a specific viscosity. Thin lubricating oils are mostly deemed to have low viscosity and thick lubricating oils are deemed to have high viscosity.īut viscosity isn’t just measured for lubricating oils or paints and adhesives. And the lower the viscosity, the thinner the oil. The higher the viscosity, the thicker the oil. Viscosity nowadays means a measurement of the flowability of a lubricating oil or hydraulic fluid. Several modern devices have been installed in the laboratory just for determining viscosity alone. OELCHECK principally assesses viscosity in oil samples at 40☌ and 100☌ and calculates the viscosity index from this. Since it can change when an oil is being used, it is one of the most fascinating and extensive topics in lubricant analytics. It is also dependent on temperature and can be infl uenced by special additives. It plays the decisive role in the choice of accompanying lubricant as it describes its fl uid characteristics. Viscosity is the most important physical characteristic of an oil. Shop by ISO VG 100, AGMA 3, SAE 30 Oil category below.The single most important physical characteristic of any oil If you need any help determining which oil may work best for your machine, please call us at 1-85. viscosity) these oils demonstrate.Ĭlick here to view or print the Comparative Viscosity Chart. These numbers refer to the standard testing mechanisms used to determine how much resistance to flow (i.e. AGMA 3 lubricants have a minimum viscosity of 90 mPa.s and a maximum viscosity of 110 mPa.s. SAE 30W oil has a minimum high-temperature kinematic viscosity of 9.3 mm 2/s (cSt). In the case of ISO VG 100 oil, those numbers are 90.0 cSt and 110.0 cSt, respectively. The midpoint is derived by taking the average of both the minimum and maximum kinematic viscosities. ISO VG 100 oil has a midpoint kinematic viscosity of 100 mm 2/s, also referred to as centistokes (cSt). ISO VG 100/SAE 30/AGMA 3 lubricants for industrial and (few) automotive applications are commonly employed in hydraulic systems, moderately-loaded and heavily-loaded gearboxes, food industry machinery, slide ways, and some air and gas compressors. In other words, these oil classifications are interchangeable in their applications - however, it is best to consult OEM specifications to determine which lubricant specification is recommended for use. Some oils that may be classified as ISO VG 100 oil may also be classified as an AGMA 3 and/or SAE 30 oil. Naturally, this specification is most often reserved for automotive lubricants, however, there are also SAE Gear Oils. SAE stands for the Society of Automotive Engineers. AGMA stands for the American Gear Manufacturers Association - this specification is dedicated to gear oils. This classification is almost exclusively limited to industrial lubricants. ISO VG stands for International Standards Organization Viscosity Grade.
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