ASTM D341-20e1

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
´1
Designation: D341 − 20
Standard Practice for
Viscosity-Temperature Equations and Charts for Liquid
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Petroleum or Hydrocarbon Products
This standard is issued under the fixed designation D341; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1
ε NOTE—Editorially removed adjunct information in August 2020.
multiple temperatures is applicable to D341. Some examples are given
1. Scope*
below.
1.1 This practice covers kinematic viscosity-temperature
D445 Test Method for Kinematic Viscosity of Transparent
equations and charts (see Figs. 1-3), which are a convenient
and Opaque Liquids (and Calculation of Dynamic Viscos-
means to ascertain the kinematic viscosity of a petroleum oil or
ity)
liquid hydrocarbon at any temperature within a limited range,
D7042 Test Method for Dynamic Viscosity and Density of
provided that the kinematic viscosities at two temperatures are
Liquids by Stabinger Viscometer (and the Calculation of
known.
Kinematic Viscosity)
1.2 The charts are designed to permit petroleum oil kine- D7279 Test Method for Kinematic Viscosity of Transparent
and Opaque Liquids by Automated Houillon Viscometer
matic viscosity-temperature data to plot as a straight line. The
charts have been derived from the equations shown in Section
3. Method Limitations
5.The charts here presented provide a significant improvement
in linearity over the charts previously available under Method
3.1 Warning—The charts should be used only in that range
D341 – 03. This increases the reliability of extrapolation to
inwhichthehydrocarbonorpetroleumfluidsarehomogeneous
higher temperatures.
liquids. The suggested range is thus between the cloud point at
low temperatures and the initial boiling point at higher tem-
1.3 The values provided in SI units are to be regarded as
peratures. The charts provide improved linearity in both low
standard.
kinematic viscosity and at temperatures up to 340 °C (approxi-
1.3.1 Exception—The values given in parentheses are pro-
mately 650 °F) or higher. Some high-boiling point materials
vided for information only.
can show a small deviation from a straight line as low as
1.4 This international standard was developed in accor-
280 °C (approximately 550 °F), depending on the individual
dance with internationally recognized principles on standard-
sample or accuracy of the data. Reliable data can be usefully
ization established in the Decision on Principles for the
plotted in the high temperature region even if it does exhibit
Development of International Standards, Guides and Recom-
some curvature. Extrapolations into such regions from lower
mendations issued by the World Trade Organization Technical
temperatures will lack accuracy, however. Experimental data
Barriers to Trade (TBT) Committee.
taken below the cloud point or temperature of crystal growth
will generally not be of reliable repeatability for interpolation
2. Referenced Documents
or extrapolation on the charts. It should also be emphasized
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2.1 ASTM Standards:
that fluids other than hydrocarbons will usually not plot as a
straight line on these charts.
NOTE 1—Any ASTM standard that measures kinematic viscosity at
3.2 These charts are derived from the equations shown in
Section 5 and are applicable over the following ranges:
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This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
Fig. 1 0.30 cSt to 20 000 000 cSt and –70 °C to 370 °C
Products, Liquid Fuels, and Lubricants and are the direct responsibility of
Fig. 2 1.50 cSt to 200 000 cSt and –40 °C to 150 °C
Subcommittee D02.07 on Flow Properties.
Fig. 3 0.18 cSt to 7.0 cSt and –70 °C to 370 °C
Current edition approved May 1, 2020. Published June 2020. Originally
approved in 1932. Last previous edition approved in 2017 as D341 – 17. DOI:
4. Procedure for Use of the Charts
10.1520/D0341-20E01.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1 Plot two known kinematic viscosity-temperature points
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
onthechart.Drawasharplydefinedstraightlinethroughthem.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. A point on this line, within the range defined in Section 3,
*A Summary of Changes section appears at the end of this standard
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