MOLECULAR WEIGHT OF PETROLEUM OILS: ASTM D2502
EXPLANATION
This test method calculates molecular weight of petroleum oils from kinematic viscosity measurements at 100 and 210° F. It is applicable to samples with molecular weights in the range from 250 to 700 and is intended for use with average petroleum fractions. It should not be applied indiscriminately for oils that represent extremes of composition or possess an exceptionally narrow molecular weight range.
TEST SUMMARY
Kinematic viscosity (Test Method ASTM D445) of the sample is measured at 100 and 210° F, and then using the tables provided, the molecular weight is calculated.
TEST PRECISION
This test method has a repeatability of 3 and a reproducibility of 25 g/mol.
The bias is not known.
