ASTM_E_130_-_08.pdf

Designation:E 130 08Standard Practice forDesignation of Shapes and Sizes of Graphite Electrodes1This standard is issued under the fixed designation E 130;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a number of specific graphiteelectrode shapes and sizes that are useful in spectrochemicalanalysis.1.2 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.2.Referenced Documents2.1 ASTM Standards:2E 135 Terminology Relating to Analytical Chemistry forMetals,Ores,and Related Materials3.Terminology3.1 For definitions of terms used in this practice,refer toTerminology E 135.3.2 Definitions of Terms Specific to This Standard:3.2.1 preforma descriptive word applied to a commer-cially produced spectroscopic electrode which is purified aftermachining.4.Summary of Practice4.1 The practice classifies electrodes by application andprovides dimensional specifications.5.Significance and Use5.1 This practice is intended as a reference for spectro-chemical methods that utilize graphite electrodes.Methodsshould employ and reference one of the electrode shapes in thispractice,but if this is not possible,the method should includeelectrode specifications for the specific shape used.5.2 This practice should be referred to in a method byincluding a statement such as the following in the section onReagents and Materials:Graphite ElectrodesThe electrode(s)shall be of high-purity graphite and conform to type(s)(insert designation fromthis method)as depicted in Practice E 130.6.Classes6.1 Seven classes of graphite electrodes are designated asfollows:6.1.1 Class CCounter Electrodes,for use opposite thespecimen or opposite the electrode that contains the specimen.6.1.2 Class SSpecimen Electrodes,for use with liquid orparticulate specimens.Thin-wall cups allow faster burn off ofgraphite and faster consumption of the specimen.Undercutcups provide greater heating of the specimen.6.1.3 Class PSpecimen Electrodes,for use with noncon-ducting specimens or with specimens that require a center postthat tends to stabilize the excitation.6.1.4 Class PCPorous Cup Electrodes,for use with liquidspecimens only.6.1.5 Class DSpecimen Electrodes,of disk shape for usewith liquid specimens.6.1.6 Class VC and VCEVacuum Cups and SpecimenElectrodes,consisting of a tubular graphite electrode overwhich is positioned a tetrafluorethylene(TFE)cup which holdsa liquid specimen.6.1.7 Class DCPElectrodes,for use as anodes on direct-current plasma spectrometers.7.Dimensions7.1 The dimensions of the electrodes of the various classesare given in Fig.1.Unless exceptions are indicated,thefollowing tolerances apply:1This practice is under the jurisdiction of ASTM Committee E01 on AnalyticalChemistry for Metals,Ores and Related Materials and is the direct responsibility ofSubcommittee E01.20 on Fundamental Practices.Current edition approved May 1,2008.Published May 2008.Originallyapproved in 1957.Last previous edition approved in 2003 as E 130 87(2003).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.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Copyright ASTM International Provided by IHS under license with ASTM Licensee=Ohio State University/5967164005 Not for Resale,03/02/2012 21:04:22 MSTNo reproduction or networking permitted without license from IHS-,-,-6mm6in.Outside diameter0.050.002Length0.410.016Cavity,inside diameter0.080.003Cavity,depth0.080.003Neck,outside diameter0.130.005Neck,location0.130.005Neck,length0.130.005Concentricity,total indicator reading:Holes under 12.7 mm(0.5 in.)deepand undercuts0.130.005Holes over 12.7 mm(0.5 in.)deep0.250.010Rotating disks,inside diameter0.030.001Rotating disks,thickness0.130.005Boiler caps,inside diameter0.020.001Porous cups,bottom thickness:Under 25.4 mm(1 in.)long+0.05+0.0020.000.000Over 25.4 mm(1 in.)long+0.08+0.0030.000.000Angle60.57.2 Certain methods,such as those employing carrier dis-tillation techniques,may require closer tolerances than thosespecified in 7.1.The following special tolerances will beexceptions to the normal tolerances when the suffix(X)is usedalong with the class designation.For example,S-12(X)desig-nates the following exceptions to the normal tolerances:6mm6in.Cavity,inside diameter0.010.0005Cavity,depth0.050.002Neck,outside diameter0.050.002Neck,location0.080.003Neck,length0.080.003Rod,outside diameter0.030.0018.Keywords8.1 graphite electrodes;spectrometric analysisE 130 082Copyright ASTM International Prov