Iso vg 46 classes

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If you accept cookies from external media, accessing these contents no longer requires giving manual consent. Reference ISO Dynamic viscosities are usually measured under high shear conditions, for example, the cone on plate or cylinder viscometer in which the viscous shear torque is measured between two cylinders. The physical principle of measurement is based on the rate at which a fluid flows under gravity through a capillary tube.

With the viscosity known at two reference temperatures the viscosity can be calculated for intermediate temperatures using the interpolation function of Ubbelohde-Walther, which is adopted by ASTM D The first number 15W refers to the viscosity grade at low temperatures W from winter , whereas the second number 40 refers to the viscosity grade at high temperature. Note that the presence of any yield stress detectable by this method constitutes a failure regardless of viscosity.

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