ASTM D2501 Test Method for Calculation of Viscosity-Gravity Constant (VGC) of Petroleum Oils
5. Measurement of Physical Properties
5.1 Preferably, determine the kinematic viscosity at 40°C as described in Test Method D445. However, if the sample is extremely viscous or if it is otherwise inconvenient to measure the viscosity at 40°C, the viscosity at 100°C may be determined.
5.2 Determine the density at 15°C in accordance with Test Method D1298 or Test Method D4052. Equivalent results can be obtained by determining API Gravity at 60°F (15.56°C) in accordance with Test Method D287, and converting the result to density at 15°C by means of Table 3 of the Petroleum Measurement Tables (American Edition).
NOTE 1 - If it is necessary to convert a result obtained using the digital density meter to a density at another temperature, the Petroleum Measurement Tables can be used only if the glass expansion factor has been excluded.
