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Viscosity chemistry means9/11/2023 ![]() ![]() Widely used materials are, for example, olefin copolymers (OCP), polyalkyl methacrylates (PAMA), poly isobutylene (PIB), styrene block polymers, methylmethacrylate (MMA), polybutadiene rubber (PBR), cis-polyisoprene. ![]() VI modifiers are normally used in multi-grade engine oils, gear oils and automatic transmission fluids, power steering fluids, hydraulic fluids and greases. This method is considered obsolete by ASTM and replaced by ASTM D2270. This is the method that determines the viscosity index of lubricating oils. Viscosity index means that it measures the change in viscosity with temperature – a high viscosity index indicates a small viscosity change of a petroleum product with changes in temperature. The viscosity of oil usually decreases as the temperature increases. For user reference, 1 mm 2/s = 10 -6m 2/s = 1 cSt.ĪSTM D567 Method for Calculation of Viscosity Index from Viscosity at 100✯ and 210✯. ![]()
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