ASTM D7945-16

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of the standard as published by ASTM is to be considered the official document.
Designation: D7945 − 15 D7945 − 16
Standard Test Method for
Determination of Dynamic Viscosity and Derived Kinematic
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Viscosity of Liquids by Constant Pressure Viscometer
This standard is issued under the fixed designation D7945; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
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).
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1.3 The range of kinematic viscosity covered by this test method is from 0.5 mm /s to 1000 mm /s in the temperature range
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between –40 °C to 120 °C; however the precision has been determined only for fuels and oils in the range of 2.06 mm /s to 476
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mm /s at 40 °C and 1.09 to 107 mm /s at 100 °C (as stated in Section 12 on Precision and Bias). For jet fuels, the precision of
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kinematic viscosity has been determined in the range of 2.957 mm /s to 5.805 mm /s at –20 °C and 5.505 mm /s to 13.03 mm /s
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at –40 °C (as stated in Section 12 on Precision and Bias), and the precision of the temperature at 12 mm /s (cSt) has been
determined in the range of –38.3 °C to –58.1 °C (as stated in Section 13 on Precision and Bias). The precision has only been
determined for those materials, viscosity ranges, and temperatures as indicated in Section 12 on Precision and Bias. The test
method can be applied to a wider range of materials, viscosity, and temperature. For materials not listed in Section 12 on Precision
and Bias, the precision and bias may not be applicable.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
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2.1 ASTM Standards:
D341 Practice for Viscosity-Temperature Charts for Liquid Petroleum Products
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D1655 Specification for Aviation Turbine Fuels
D2162 Practice for Basic Calibration of Master Viscometers and Viscosity Oil Standards
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
D6708 Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport
to Measure the Same Property of a Material
D7566 Specification for Aviation Turbine Fuel Containing Synthesized Hydrocarbons
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2.2 ISO Standards:
ISO 5725 Accuracy (Trueness and Precision) of Measurement Methods and Results
ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories
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This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.07 on Flow Properties.
Current edition approved July 1, 2015June 1, 2016. Published July 2015July 2016. Originally published in 2014. Last previous edition approved in 20142015 as
D7945 – 14.D7945 – 15. DOI: 10.1520/D7945-15.10.1520/D7945-16.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
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