1、Designation:D2947/D2947M88(Reapproved 2011)1Standard Test Method forScreen Analysis of Asbestos Fibers1This standard is issued under the fixed designation D2947/D2947M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last
2、revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially corrected in February 2012.1.Scope1.1 This test method covers a dry screen analysis forasbestos fibe
3、r by means of a mechanical sieve shaker.1.2 This test method is limited in its application to Group 4and shorter chrysotile asbestos fiber samples2as defined in TestMethod D3639.However,some short amphibole asbestosfibers may be suitable for evaluation by this method.1.3 The values stated in either
4、SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 WarningBreathing of
5、 asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks for users and for those with whom they come into contact.In addition to other precautions,when working with asbestos-cement products,minimize the dust that results.For informa-tion on the safe use of chrysolt
6、ile asbestos,refer to“Safe Useof Chrysotile Asbestos:A Manual on Preventive and ControlMeasures.”31.5 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 pr
7、actices and determine the applica-bility of regulatory limitations prior to use.For specific safetyhazard,see.2.Referenced Documents2.1 ASTM Standards:4D2590 Test Method for Sampling Chrysotile AsbestosD2946 Terminology for Asbestos and AsbestosCementProductsD3639 Test Method for Classification of A
8、sbestos by Que-bec Standard TestD3879 Test Method for Sampling Amphibole Asbestos(Withdrawn 2009)5E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Summary of Method3.1 The procedure consists of screening a test
9、 specimenthrough a specified nest of sieves by means of a mechanicalsieve shaker that reproduces the circular and tapping motiongiven testing sieves in hand-sieving,but with a uniform,mechanical action,assuring more accurate and dependabletests.4.Significance and Use4.1 Test results give some indica
10、tion of the apparent fiberlength distribution in the sample tested.4.2 Sieves are ideally suited to measure particle size andparticle size distribution when all three axes of the particle areequidimensional or the particle is of spherical shape.Asbestosfibers differ considerably from these ideal con
11、ditions and,therefore,results depart from a true measure of fiber length andlength distribution.4.3 Characteristics that influence screening efficiency influ-ence test results.Among these are moisture content,degree of1This method is under the jurisdiction of ASTM Committee C17 on Fiber-Reinforced C
12、ement Productsand is the direct responsibility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved Nov.1,2011.Published February 2012.Originallyapproved in 1971.Last previous edition approved in 2006 as D2947 88(2006).DOI:10.1520/D2947_D2947M-88R11E01.2Qu
13、ebec Asbestos Mining Assn.(QAMA)standard designation of chrysotileasbestos grades.3Available from The Asbestos Institute,http:/ 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 t
14、o the standards Document Summary page onthe ASTM website.5The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 fiberization,harshness,and the tendency for fiber
15、s to clingtogether,and of short fibers and fines to cling to longer fibers.4.4 In spite of its shortcomings,this test method is particu-larly useful because of its simplicity and speed and satisfactoryreproducibility.4.5 The test is suitable for specification acceptance andmanufacturing control.5.Ap
16、paratus5.1 Sieve Shaker6for 200-mm 8-in.diameter sieves thatimpart the screening and tapping action found necessary forthis asbestos application.5.1.1 The shaker shall be mounted on a suitable firmfoundation,preferably concrete.5.1.2 The eccentric shaft shall rotate at a speed of 285 6 5r/min.The machine shall be geared to give 152 taps/min whenthe eccentric shaft rotates at 285 r/min.5.1.3 The plate supporting the nest of sieves must be set togive a clearance of 2.4 6 0.8 mm 3326132in.between t
