ASTM D2502 Test Method for Estimation of Molecular Weight (Relative Molecular Mass) of Petroleum Oils From Viscosity Measurements
3. Summary of Test Method
3.1 The kinematic viscosity of the oil is determined at 100 and 210°F (37.78 and 98.89°C). A function "H" of the 100°F viscosity is established by reference to a tabulation of H function versus 100°F viscosity. The H value and the 210°F viscosity are then used to estimate the molecular weight from a correlation chart.
4. Significance and Use
4.1 This test method provides a means of calculating the mean molecular weight (relative molecular mass) of petroleum oils from another physical measurement.
4.2 Molecular weight (relative molecular mass) is a fundamental physical constant that can be used in conjunction with other physical properties to characterize hydrocarbon mixtures.
