1、Designation: C562 91 (Reapproved 2010)1An 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
2、 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 Department of Defense.1NOTEUpdated units of measure throughout
3、 the standard editorially in May 2010.1. Scope1.1 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
4、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 Standa
5、rds:2C561 Test Method for Ash in a Graphite Sample3. Significance and Use3.1 This test method is feasible only for the volatile mois-ture present on the graphite due to adsorption from theatmosphere and is not intended to give representative moisturedata for graphite that has been exposed to liquid
6、watercontamination.4. Interferences4.1 Final weights (and therefore percent moisture values)may be influenced by the following:4.1.1 Type and condition of desiccant.4.1.2 Ambient relative humidity at the time of the test.4.1.3 Timing and procedure for moving samples from des-iccator to the balance.4
7、.1.4 Adsorptivity of the graphite sample relative to theadsorptivity of the desiccant used.4.1.5 Residency time in the desiccator.5. Apparatus5.1 Alumina Ceramic or Platinum Crucible or Dish, suit-able for holding sample (subsequently called sample holder).5.2 Analytical Balance, capable of weighing
8、 to 60.0002 g.5.3 Drying Oven, air convection type, capable of beingcontrolled to 110 6 2C.5.4 Desiccator, charged with indicating desiccant.6. Sampling6.1 Samples may be solid or particulate. Solid bodies maybe sampled by removing one or more solid pieces from thebody by, for example, sawing, turni
9、ng, 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.7. Procedure7.1 Tare a dried sample holder using an analytical balance.Weigh a 25 to 50-g sample into the tared samp
10、le holder andreweigh both. (Perform all weighings to a precision of60.002 g.)7.2 Place the sample holder containing the sample in adrying oven maintained at 110 6 2C for 2 h. Remove from theoven and immediately place in the desiccator. When the samplehas reached room temperature, remove from the des
11、iccator andweigh immediately.7.3 Repeat the procedure prescribed in 7.2 until a constantweight of 60.002 g is achieved.7.4 The dried sample may be reserved for ash determina-tion. (See Test Method C561.)8. Calculation8.1 Calculate the percentage of moisture as follows:Moisture, % 5 B 2 C!/B 2 A!# 3
12、100where:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.F0 on Manufactured Carbon and Graphite Products.Current edition approved May 1, 2010. Published May 2010. Originallyapproved in 1965. Las
13、t previous edition approved in 2005 as C56291(2005). DOI:10.1520/C0562-91R10E01.2For 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
14、onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.A = weight of sample holder,B = weight of sample holder and sample, andC = weight of sample holder and dried sample.9. Report9.1 The report shall include the followin
15、g information:9.1.1 Proper identification of the sample, and9.1.2 Results obtained from at least two moisture determi-nations, and their average.10. Precision and Bias310.1 The precision of this test method was determinedduring a round-robin test among four laboratories testingsamples split from a c
16、ommon 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.10.2 On this sample the mean, standard deviation betweenlaboratories and standard deviation within laboratories w
17、ere,respectively:Mean 0.0155%Between laboratories 0.0143%Within laboratories 0.0037%10.3 No bias was noted during the round-robin test; how-ever, the method is empirical and there is no suitable referencematerial that can be used to determine the bias of this testmethod.11. Keywords11.1 carbon; grap
18、hite; moistureASTM 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 su
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21、e ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the
22、 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C05-1008.C562 91 (2010)12
