ASTM_D_2161_-_20.pdf

Designation:D216120Standard Practice forConversion of Kinematic Viscosity to Saybolt UniversalViscosity or to Saybolt Furol Viscosity1This standard is issued under the fixed designation D2161;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript 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.Scope*1.1 This practice2covers the conversion tables and equa-tions for converting kinematic viscosity in mm2/s at anytemperature to Saybolt Universal viscosity in Saybolt Univer-sal seconds(SUS)at the same temperature and for convertingkinematic viscosity in mm2/s at 122 F and 210 F(50 C and98.9 C)to Saybolt Furol viscosity in Saybolt Furol seconds(SFS)at the same temperatures.Kinematic viscosity values arebased on water being 1.0034 mm2/s(cSt)at 68 F(20 C).1.2 If a method other than Test Method D445 is used togenerate the kinematic viscosity data,apply appropriaterelative-bias correction factors as found in the precision sectionof that method,before performing the calculations of thispractice.NOTE1The equations in D2161 were originally empirically derivedusing data from both D445 and the Saybolt viscometer method.Therefore,it is conceivable that an error could result if the kinematic viscosities usedare not bias-corrected to D445 results.It is recommended that kinematicviscosity be reported in millimetres squared per second,instead of SayboltUniversal Seconds(SUS)or Saybolt Furol Seconds(SFS).This method isbeing retained for the purpose of calculation of kinematic viscosities fromSUS and SFS data that appear in past literature.One millimetre squaredper second(mm2/s)equals one centistoke(cSt),which is another unitcommonly found in older literature.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forreference information purposes only.The SI unit of kinematicviscosity is mm2/s.1.3.1 ExceptionFahrenheit temperature units are used inthis practice because they are accepted by industry for the typeof legacy conversions described in this practice.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D2270 Practice for Calculating Viscosity Index from Kine-matic Viscosity at 40 C and 100 CD7042 Test Method for Dynamic Viscosity and Density ofLiquids by Stabinger Viscometer(and the Calculation ofKinematic Viscosity)3.Summary of Practice3.1 The Saybolt Universal viscosity equivalent to a givenkinematic viscosity varies with the temperature at which thedetermination is made.The basic conversion values are thosegiven in Table 1 for 100 F.The Saybolt Universal viscosityequivalent to a given kinematic viscosity at any temperaturemay be calculated as described in 4.3.Equivalent values at210 F are given in Table 1 for convenience.3.2 The Saybolt Furol viscosity equivalents are tabulated inTable 3 for temperatures of 122 F and 210 F only.1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.07 on Flow Properties.Current edition approved Dec.1,2020.Published January 2021.Originallyapproved in 1963,replacing former D446 and D666.Last previous edition approvedin 2019 as D2161 19.DOI:10.1520/D2161-20.2This practice,together with Practice D2270,replaces Compilation of ASTMViscosity Tables for Kinematic Viscosity Conversions.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization T