1.1 This test method covers the measurement of dynamic viscosity and density for the purpose of derivation of kinematic viscosity of petroleum liquids, both transparent and opaque. The kinematic viscosity, ν, in this test method is derived by dividing the dynamic viscosity, η, by the density, ρ, obtained at the same test temperature. This test method also calculates the temperature at which petroleum liquids attain a specified kinematic viscosity using Practice D341.
1.2 The result obtained from this test method is dependent upon the behavior of the sample and is intended for application to liquids for which primarily the shear stress and shear rate are proportional (Newtonian flow behavior).
1.3 The range of kinematic viscosity covered by this test method is from
0.5 mm2 /s to 1000 mm2 /s in the temperature range between –40 °C to 120 °C; however the precision has been determined only for fuels and oils in the range of
ASTM D7945-21a Referenced Document
ASTM D1655 Standard Specification for Aviation Turbine Fuels
ASTM D2162 Standard Test Method for Basic Calibration of Master Viscometers and Viscosity Oil Standards
ASTM D341 Standard Test Method for Viscosity-Temperature Charts for Liquid Petroleum Products
ASTM D445 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity)
ASTM D6300 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
ASTM D6708 Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material*, 2024-03-01 Update
ASTM D7566 Standard Specification for Aviation Turbine Fuel Containing Synthesized Hydrocarbons*, 2023-10-01 Update
ISO 5725 Precision of test methods; Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests
ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories [Standard in French]
ASTM D7945-21a history
2023ASTM D7945-23 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2021ASTM D7945-21a Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2021ASTM D7945-21 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2020ASTM D7945-20a Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2020ASTM D7945-20 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2016ASTM D7945-16 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2015ASTM D7945-15 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
2014ASTM D7945-14 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer