1、Designation: C838 96 (Reapproved 2010)1C838 16 An American National StandardStandard Test Method forBulk Density of As-Manufactured Carbon and GraphiteShapes1This standard is issued under the fixed designation C838; the number immediately following the designation indicates the year oforiginal adopt
2、ion 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 NOTEUpdated units of measurement throughout the standard editorially in May 2010.1.
3、 Scope Scope*1.1 This test method covers the determination of the density of as-manufactured carbon and graphite from measurements ofmass and dimensions at room temperature.1.2 This test method is applicable to boronated carbon and graphite.1.3 This test method is not applicable to carbon- and graph
4、ite-containing materials that are thermally unstable at or belowtemperatures of 200C.200 C.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This standard does not purport to address all of the safety concerns, if any, a
5、ssociated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C559 Test Method for Bulk Density by Physical Measurement
6、s of Manufactured Carbon and Graphite Articles3. Terminology3.1 Definitions of Terms Specific to This Standard:Definitions:3.1.1 bulk density, nin carbon and graphite technology, the mass of a unit volume including both permeable and impermeablevoids (and boron compounds in the case of boronated car
7、bon or boronated graphite) present in the material at room temperature.4. Significance and Use4.1 This test method provides a means of determining bulk density on as-manufactured logs, blocks, or shaped articles.4.2 This test method is suitable for manufacturing control and acceptance specifications
8、.4.3 Test Method C559 may be used when a higher degree of accuracy is required.5. Test Specimens5.1 Logs or BlocksMay be measured and weighed as-manufactured or after rough ends have been squared by machining. Thestock shall preferably have been indoors after heat treatment; if there is doubt that t
9、he piece is dry, weigh, dry, and reweigh it.Repeat, if necessary, until there is less than 0.1 % weight loss. The drying temperature should be from 110110 C to 200C.200 C.5.2 Shaped ArticlesOther than right circular cylinders or rectangular parallelepipeds may be measured, and a correction madefor t
10、he cavities or protuberances if the specimen volume can be determined within 0.5 % (see 6.2).1 This test method is under the jurisdiction of Committee D02 on Petroleum Products Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.F0 on Manufactured Carbon and Gr
11、aphite Products.Current edition approved May 1, 2010Jan. 1, 2016. Published May 2010February 2016. Originally approved in 1980. Last previous edition approved in 20052010 asC838 96 (2005).(2010)1. DOI: 10.1520/C0838-96R10E01.10.1520/C0838-16.2 For referencedASTM standards, visit theASTM website, www
12、.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of wha
13、t changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the
14、 official document.*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 States16. Procedure6.1 Logs or BlocksMeasure as-manufactured on the diameter or cross section at two differen
15、t locations, taking care to avoiddistortions. Take four length measurements on cylinders 90 apart on the periphery of the circular end faces. On rectangular pieces,make four length measurements, two each along opposite faces. Make additional measurements, if needed, to determine a validmean for each
16、 dimension. Make dimensional and mass measurements with equipment accurate to 0.5 %.NOTE 1Corrections of mass measurements for buoyancy effects in air are generally negligible for the accuracy obtained.6.2 Shaped ArticlesMake dimensional and mass measurements with equipment accurate to 0.5 %.7. Calc
17、ulation7.1 Calculate the bulk density as follows:D 5MVwhere:D = density, kg/m3,M = mass, kg, andV = volume, m3.7.2 Calculate to three significant figures.8. Report8.1 Report the following:8.1.1 Type, source, grade, geometry, and whether the specimen is as-manufactured or machined.8.1.2 Densities of
18、the individual specimens and the averages.8.1.3 On shaped articles, other than right circular cylinders or rectangular parallelepipeds, the amount of volume correction andmethod of calculation used in 5.2.9. Precision and Bias39.1 Precision:9.1.1 Amachined steel mass and an unmachined graphite bille
19、t, both right circular cylinders, were circulated to five laboratories.Each laboratory utilized two independent observers, each making a replicate set of measurements. Also, each laboratory wasinstructed to use normal industrial practice, that is, no special calibration or precaution. The data were
20、tested against the nullhypothesis (no difference between labs) and the random effects model for between-laboratory variance.9.1.2 Measurements on dimensions satisfied the null hypothesis with a pooled coefficient of variation of 0.25 % for thecalculated volume. Masses, and hence densities, did not s
21、atisfy the null hypothesis. Within-laboratory coefficient of variation ondensity was 0.28 % and between-laboratory coefficient was 0.81 %. Although the between-laboratory data indicated a bias,subsequent rechecking failed to identify such.9.1.3 These precision measures represent normal industrial pr
22、actice and do not indicate the precision attainable under controlledconditions.9.2 BiasNo statement on bias is derivable since the tests were performed with normal industrial practices and procedures.10. Keywords10.1 boronated; bulk; carbon; density; graphite; gravimetric; physicalSUMMARY OF CHANGES
23、Subcommittee D02.F0 has identified the location of selected changes to this standard since the last issue(C838 96 (2010)1) that may impact the use of this standard. (Approved Jan. 1, 2016.)(1) Revised Section 3, Terminology.3 Supporting data have been filed at ASTM International Headquarters and may
24、 be obtained by requesting Research Report RR:C05-1002.C838 162ASTM 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
25、 patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited
26、either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fa
27、ir 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, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this st
28、andard 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ Corrections of mass measurements for buoyancy effects in air are generally negligible for the accuracy obtained.C838 163
