ASTM_C_562_-_15.pdf

Designation:C56215An American National StandardStandard Test Method forMoisture in a Graphite Sample1This standard is issued under the fixed designation C562;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 test method provides a practical determination forthe percentage of moisture in a graphite sample.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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:2C561 Test Method for Ash in a Graphite Sample3.Terminology3.1 Definitions:3.1.1 moisture content,npercentage content by weight ofvolatile moisture present in the graphite specimen that has beenexposed to ambient conditions.4.Significance and Use4.1 This test method is applicable only for determination ofthe volatile moisture content resulting from adsorption of watervapor from the atmosphere,and is not intended to giverepresentative moisture data for graphite that has been exposedto liquid water contamination.5.Interferences5.1 Final weights(and therefore percent moisture values)may be influenced by the following:5.1.1 Type and condition of desiccant.5.1.2 Ambient relative humidity at the time of the test.5.1.3 Timing and procedure for moving samples from des-iccator to the balance.5.1.4 Adsorptivity of the graphite sample relative to theadsorptivity of the desiccant used.5.1.5 Residency time in the desiccator.6.Apparatus6.1 Alumina Ceramic or Platinum Crucible or Dish,suit-able for holding sample(subsequently called sample holder).6.2 Analytical Balance,capable of weighing to 60.0002 g.6.3 Drying Oven,air convection type,capable of beingcontrolled to 110 C 6 2 C.6.4 Desiccator,charged with indicating desiccant.7.Sampling7.1 Samples may be solid or particulate.Solid bodies maybe sampled by removing one or more solid pieces from thebody by,for example,sawing,turning,milling,or fracturing.Particulate samples may be generated from solid bodies bydrilling,using a carbide drill to minimize contamination,or byother crushing and grinding methods.8.Procedure8.1 Tare a dried sample holder using an analytical balance.Weigh a 25 g to 50 g sample into the tared sample holder andreweigh both.(Perform all weighings to a precision of60.002 g.)8.2 Place the sample holder containing the sample in adrying oven maintained at 110 C 6 2 C for 2 h.Removefrom the oven and immediately place in the desiccator.Whenthe sample has reached room temperature,remove from thedesiccator and weigh immediately.8.3 Repeat the procedure prescribed in 8.2 until a constantweight of 60.002 g is achieved.8.4 The dried sample may be reserved for ash determina-tion.(See Test Method C561.)1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.F0 on Manufactured Carbon and Graphite Products.Current edition approved Oct.1,2015.Published November 2015.Originallyapproved in 1965.Last previous edition approved in 2010 as C562 91(2010)1.DOI:10.1520/C0562-15.2For 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.*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 States1 9.Calculation9.1 Calculate the percentage of moisture content as follows:Moisture,%5B 2 C!/B 2 A!#3100where:A=weight of sample holder,B=weight of sample holder and sample,andC=weight of sample holder and dried sample.10.Report10.1 The report shall include the following information:10.1.1 Proper identification of the sample,and10.1.2 Results obtained from at least two moisturedeterminations,and their average.11.Precision and Bias311.1 The precision of this test method was determinedduring a round-robin test among four laboratories testingsamples split from a common sample which was ground to passa No.60(250 m)sieve.This sampling method was used forthe round robin to minimize variations among samples pro-vided to participating laboratories.11.2 On this sample the mean,standard deviation betweenlaboratories and standard deviation within laboratories were,respectively:Mean0.0155%Between laboratories0.0143%Within laborato