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Designation: D 2161 – 93 (Reapproved 1999)e2

An American National Standard

Standard Practice for

Conversion of Kinematic Viscosity to Saybolt Universal Viscosity or to Saybolt Furol Viscosity1
This standard is issued under the fixed designation D 2161; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of lastrevision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

e1 NOTE—Tables 1 and 3 were corrected editorially in June 2000. e2 NOTE—Table 1 headings and Eqs. 5 and 8 were corrected editorially in August 2000.1. Scope 1.1 This practice2 covers the conversion tables and equations for converting kinematic viscosity in centistokes (cSt) at any temperature to Saybolt Universal viscosity in Saybolt Universal seconds (SUS) at the same temperature and for converting kinematic viscosity in centistokes at 122 and 210°F to Saybolt Furol viscosity in Saybolt Furol seconds (SFS) at the same temperatures.Kinematic viscosity values are based on water being 1.0038 mm2/s (cSt) at 68°F (20°C).
NOTE 1—A fundamental and preferred method for measuring kinematic viscosity is by use of kinematic viscometers as outlined in Test Method D 445. It is recommended that kinematic viscosity be reported in centistokes, instead of Saybolt Universal Seconds (SUS) or Saybolt Furol Seconds (SFS). Thus this method is beingretained for the purpose of calculation of kinematic viscosities from SUS and SFS data which appear in past literature. One centistokes equals one millimetre squared per second (mm2/s).

determination is made. The basic conversion values are those given in Table 1 for 100°F. The Saybolt Universal viscosity equivalent to a given kinematic viscosity at any temperature may be calculated as describedin 4.3. Equivalent values at 210°F are given in Table 1 for convenience. 3.2 The Saybolt Furol viscosity equivalents are tabulated in Table 3 for temperatures of 122°F and 210°F only. 3.3 Examples for using the tables are given in Appenix X1. 4. Significance and Use 4.1 At one time the petroleum industry relied on measuring kinematic viscosity by means of the Saybolt viscometer, and expressingkinematic viscosity in units of Saybolt Universal, Seconds (SUS) and Saybolt Furol, Seconds (SFS). This practice is now obsolete in the petroleum industry. 4.2 This practice establishes the official equations relating SUS and SFS to the SI kinematic viscosity units, mm2/s. 4.3 This practice allows for the conversion between SUS and SFS units and SI units of kinematic viscosity. 5. Procedure forConversion to Saybolt Universal Viscosity 5.1 Convert kinematic viscosities between 1.81 and 500 mm2/s (cSt) at 100°F, and between 1.77 and 139.8 mm 2/s (cSt) at 210°F, to equivalent Saybolt Universal seconds directly from Table 1 (see Appendix X1, Example 1).
NOTE 2—Obtain viscosities not listed, but which are within the range given in Table 1, by linear interpolation (see Appendix X1, Example 2).1.2 The SI unit of kinematic viscosity, mm2/s, and temperature in degrees Fahrenheit are the standard in this practice. 2. Referenced Documents 2.1 ASTM Standards: D 445 Test Method for Kinematic Viscosity of Transparent and Opague Liquids3 D 2270 Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 and 100°C3 3. Summary of Practice 3.1 The Saybolt Universal viscosityequivalent to a given kinematic viscosity varies with the temperature at which the
1 This practice is under the jurisdication of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.07 on Flow Properties. Current edition approved March 15, 1993. Published July 1993. Originally published as D 2161 – 63, replacing former D 446 and D 666. Last...
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