1、Designation: C 899 79 (Reapproved 2007)Standard Practice forUse of Metric Units of Measure for Reporting Properties ofRefractory Materials1(COMMITTEE C-8 SUPPLEMENT TO E 380)This standard is issued under the fixed designation C 899; the number immediately following the designation indicates the year
2、 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice presents the units to be employed forrepo
3、rting the properties of refractories, such as density, crush-ing stress, modulus of rupture, tensile stress, thermal conduc-tivity, and permeability.1.2 For convenience, a table of conversion factors betweeninch-pound units and SI units is included.2. Referenced Documents2.1 ASTM Standards:2E 380 Pr
4、actice for Use of the International System of Units(SI) (the Modernized Metric System)2.2 ISO Standard:ISO 1000 SI Units and Recommendations for the Use ofTheir Multiples and of Certain Other Units33. Significance and Use3.1 This practice is provided to facilitate comparison ofphysical and mechanica
5、l 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.Itisrecommended that SI prefixes be selected for u
6、se 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:MultiplicationFactor Prefix Symbol109106gigamegaGM103102kilohectoAkh101101dekaAdeciAdad102103centiA
7、millicm106109micronanonATo be avoided where practical.3.3 The conversion factors, which have been selected fortheir general utility in the refractories industry, have been takenfrom Standard E 380, where possible. For uniformity, theyhave been presented to four decimal places. In use, theconverted v
8、alues should be rounded to the same number ofsignificant figures as in the original value.4. Standard Units4.1 Densitygrams per cubic centimetre (g/cm3).4.2 Energy or work joules (J) or megajoules (MJ).4.3 Massgrams (g), kilograms (kg), or megagrams (Mg).4.4 Permeability is currently expressed in da
9、rcys. 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 E 380. Until an SI unitof permeability is adopted, expre
10、ss permeability in darcys.4.5 Powerwatts (W) or kilowatts (kW).4.6 Pressure or stressmegapascals (MPa) (preferred). Forstress less than 1 MPa, kilopascals (kPa) may be used.NOTE 1Included are bending, crushing, shear, and tensile stress,modulus of rupture, and elastic modulus.4.7 Thermal conductivit
11、ywatts per metre kelvin (W/mK).4.8 Thermal expansion coeffcient change in length perunit length per kelvin.5. Conversion Factors5.1 Converson FactorsSee Table 1.6. Keywords6.1 metric; practice; properties; refractory1This practice is under the jurisdiction ofASTM Committee C08 on Refractoriesand is
12、the direct responsibility of Subcommittee C08.92 , the The Joseph E.Kopanda Subcommittee for Editorial, Terminology and Classification.Current edition approved Oct. 1, 2007. Published November 2007. Originallyapproved in 1979. Last previous edition approved in 2002 as C 899 79 (2002).2For referenced
13、 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.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.
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17、onsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, We
18、st Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 899 79 (2007)2
