ASTM_C_899_-_79_2018.pdf

Designation:C89979(Reapproved 2018)Standard Practice forUse of Metric Units of Measure for Reporting Properties ofRefractory Materials1(COMMITTEE C08 SUPPLEMENT TO E380)This standard is issued under the fixed designation C899;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.1.Scope1.1 This practice presents the units to be employed forreporting the properties of refractories,such as density,crush-ing stress,modulus of rupture,tensile stress,thermalconductivity,and permeability.1.2 For convenience,a table of conversion factors betweeninch-pound units and SI units is included.1.3 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ASTM Standards:2E380 Practice for Use of the International System of Units(SI)(the Modernized Metric System)(Withdrawn 1997)32.2 ISO Standard:4ISO 1000 SI Units and Recommendations for the Use ofTheir Multiples and of Certain Other Units3.Significance and Use3.1 This practice is provided to facilitate comparison ofphysical and mechanical properties of refractory materials byestablishing uniform presentation of data.3.2 Units have been chosen,where possible,to result innumbers of magnitude familiar in the refractories industry,thatis,g/cm3rather than the SI preferred unit kg/m3.It isrecommended that SI prefixes be selected for use with the unitssuch that the resulting numerical values lie between 0.1 and1000.For most properties,the prefixes kilo(k)and mega(M)are preferred.Other prefixes are given in the following table:MultiplicationFactorPrefixSymbol109gigaG106megaM103kilok102hectoAh101dekaAda101deciAd102centiAc103millim106micro109nanonATo be avoided where practical.3.3 The conversion factors,which have been selected fortheir general utility in the refractories industry,have been takenfrom Practice E380,where possible.For uniformity,they havebeen presented to four decimal places.In use,the convertedvalues should be rounded to the same number of significantfigures as in the original value.4.Standard Units4.1 DensityGrams per cubic centimetre(g/cm3).4.2 Energy or WorkJoules(J)or megajoules(MJ).4.3 MassGrams(g),kilograms(kg),or megagrams(Mg).4.4 Permeability is currently expressed in darcys.One darcyis a flow of 1.00 cm3/s of a fluid of 1 centipoise(cP)viscositythrough a 1-cm cube of the material being measured under apressure differential of 1 atmosphere.Thus,a darcy is not an SIunit.No permeability units are given in Practice E380.Until anSI unit of permeability is adopted,express permeability indarcys.4.5 PowerWatts(W)or kilowatts(kW).4.6 Pressure or StressMegapascals(MPa)(preferred).Forstress less than 1 MPa,kilopascals(kPa)may be used.1This practice is under the jurisdiction ofASTM Committee C08 on Refractoriesand is the direct responsibility of Subcommittee C08.92 The Joseph E.KopandaSubcommittee for Editorial,Terminology,and Classification.Current edition approved Oct.1,2018.Published October 2018.Originallyapproved in 1979.Last previous edition approved in 2013 as C899 79(2013).DOI:10.1520/C0899-79R18.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright 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 Technical Barriers to Trade(TBT)Committee.1 NOTE1Included are bending,crushing,shear and tensile stress,modulus of rupture,and elastic modulus.4.7 Thermal ConductivityWatts per metre kelvin(W/mK).4.8 Thermal Expansion CoeffcientChange in length perunit length per kelvin.5.Conversion Factors5.1 Converson FactorsSee Table 1.6.Keywords6.1 metric;practice;properties;refractoryASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such