Lubricants of a given ASTM or BSI grade are slightly more viscous than lubricants of the corresponding ISO grade. Viscosity grade numbers of the ISO are the same as those of ASTM (The American Society of Testing and Materials) and BSI (British Standards Institution), with the difference that the viscosities for the ISO grades are measured at 40 ☌, while those of the ASTM and BSI are measured at 100 ☏ (37.8 ☌). Viscosity table/chart as per ISO 3448 for industrial fluids. The ISO system is primarily used for hydraulic oil, industrial oils, such as turbine oils, compressor oils and others. ISO VG are based on kinematic viscosity of the lube oil/fluid at 40☌. The higher viscosity index of a hydraulic oil, the less the viscosity changes or the greater the temperature range in which this hydraulic oil can be used. ISO viscosity classification system or ISO Viscosity grades also called ISO VG contains 18 viscosity grades. Lubricant viscosity performs a prime role against friction and wear. Settled in 1975 by a joint committee of International Standards Organization (ISO), American Society for Testing and Materials (ASTM), Society for Tribologists and Lubrication Engineers (STLE), British Standards Institute (BSI), and Deutsches Institute for Normung (DIN). A viscosity grades classification or standard known as the ISO VG (International Standards Organization Viscosity Grade). For engine oil check SAE J300 and SAE J306 for gear oils. ISO-VG (Viscosity Grade) classes apply only for industrial lubricating oils. Industrial fluids kinematic viscosity according to ISO 3448, DIN 51519
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