ASTM_D_7633_-_13.pdf

Designation:D763313Standard Test Method forCarbon BlackCarbon Content1This standard is issued under the fixed designation D7633;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 test method covers the instrumental determinationof carbon content in a carbon black sample.Values obtainedrepresent the total carbon content.1.2 The method is applicable to tread,carcass and specialtytype carbon blacks obtained from partial combustion or ther-mal decomposition processes,which typically contain 95 to100%carbon.1.3 The results of these tests can be expressed as mass%carbon.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1799 Practice for Carbon BlackSampling PackagedShipmentsD1900 Practice for Carbon BlackSampling Bulk Ship-mentsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3.Summary of Test Method3.1 In this test method,a sample is weighed in a combustionboat and the carbon content is determined by placing the boatin a tube furnace operating at 1350C in a stream of oxygenresulting in complete combustion.Carbon in the sample isoxidized to carbon dioxide.Moisture and particulates areremoved from the gas stream by traps filled with anhydrousmagnesium perchlorate.The gas stream is then passed througha cell in which carbon dioxide concentration is measured by aninfrared(IR)absorption detector at a precise wavelength in theIR spectrum.3.2 This test method is for use with commercially availablecarbon analyzers equipped to carry out the combustion andmeasurement operations automatically.3.3 The carbon analyzer must be calibrated using an appro-priate calibration standard(see 6.4).4.Significance and Use4.1 The total carbon content of a carbon black is a require-ment for the calculation and reporting of carbon dioxideemissions.It can also be used in calculations to estimate yieldof the process.5.Apparatus5.1 Analytical Balance,or equivalent,capable of a weighingsensitivity of 1 mg or better resolution.5.2 Gravity Convection Drying Oven,capable of maintain-ing 125 6 5C.5.3 Measurement Apparatus,equipped to automaticallycombust the sample and measure carbon content.5.4 Combustion tube and boat made of a suitable materialsuch as mullite,porcelain or zircon.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.3Other grades may beused,provided it is first ascertained that the reagent is of1This test method is under the jurisdiction of ASTM Committee D24 on CarbonBlack and is the direct responsibility of Subcommittee D24.66 on Environment,Health,and Safety.Current edition approved Nov.1,2013.Published December 2013.Originallyapproved in 2010.Last previous edition approved in 2010 as D7633 10b.DOI:10.1520/D7633-13.2For 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.3“Reagent Chemicals,”American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.and the United States Pharmacopeia andNational Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 sufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 Magnesium Perchlorate.6.3 Oxygen,high purity,99.9%.6.4 Calibration standard.47.Sampling7.1 Samples of candidate carbon blacks shall be taken inaccordance with Practice D1799 or D1900.8.Preparation of Apparatus8.1 Assemble the apparatus according to the manufacturersinstructions.8.2 Stabilize the furnace temperature at 1350 6 15C.8.3 Make a minimum of two determinations to condition theequipment or follow manufacturers recommendation to con-dition equipment prior to calibrating the instrument.9.Calibration9.1 Calibrate the instrument per manufacturers recommen-dation using a car