1、Designation:C1121/C1121M04(Reapproved 2015)Standard Test Method forTurner and Newall(T and N)Wet-Length Classification ofAsbestos1This standard is issued under the fixed designation C1121/C1121M;the number immediately following the designation indicates the yearof original adoption or,in the case of
2、 revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the operation of the Turner andNewall(T and N)wet sieving classifier for asb
3、estos,2and aprocedure for the determination of fiber length distribution andfines(defined in Terminology D2946)content of milled asbes-tos fiber(74 m 200 mesh)sieve described in SpecificationE11.1.2 For purposes of estimating length distribution,the test islimited to samples free from excessive quan
4、tities of non-fibrous particles or contaminants.Quantities exceeding 0.05 gretained in any given length fractions are considered excessive.1.3 For comparisons between different fiber grades,onlythose specimens which have approximately the same degree offiberization as determined by Test Methods D275
5、2/D2752Mwill give completely meaningful results.1.4 This test method is not applicable to ultrafine grades ofasbestos powders which contain little or no fibers retained ona 74-m 200 mesh sieve.This method is restricted to QuebecStandard3grades 4A to 7D inclusive as determined by TestMethod D3639/D36
6、39M.NOTE1This is an alternative procedure to Test Method D2589/D2589M.1.5 The values stated in either 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.Combi
7、ningvalues from the two systems may result in non-conformancewith the standard.1.6 WarningBreathing of 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 wit
8、h asbestos-cement products,minimize the dust that results.For informa-tion on the safe use of chrysoltile asbestos,refer to“Safe Useof Chrysotile Asbestos:A Manual on Preventive and ControlMeasures.”41.7 This standard does not purport to address all of thesafety concerns,if any,associated with its u
9、se.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.For a specifichazard statement,see 1.6.2.Referenced Documents2.1 ASTM Standards:5D2589/D2589M Test Method for McNett W
10、et Classificationof Dual Asbestos FiberD2590/D2590M Test Method for Sampling Chrysotile As-bestosD2752/D2752M Test Methods for Air Permeability of As-bestos FibersD2946 Terminology for Asbestos and AsbestosCementProductsD3639/D3639M Test Method for Classification of Asbestosby Quebec Standard TestD3
11、879 Test Method for Sampling Amphibole Asbestos(Withdrawn 2009)6E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods2.2 Other Standard:Quebec Asbestos Mining Association(QAMA)StandardDesignation of Chrysotile Asbest
12、os Grades31This test method is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct responsibility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved July 1,2015.Published July 2015.Originally approvedin 1989.
13、Last previous edition approved in 2009 as C1121 04(2009)1.DOI:10.1520/C1121_C1121M-04R15.2The apparatus is supplied,on a non-profit basis,as a service to the asbestosindustry by TAF International,Bowdon House,Ashburton Rd.W,Trafford Park,Manchester M170RQ,England.3Available from the Asbestos Institu
14、te,1300 Sherbrooke St.West,Suite 412,Montreal QC,Canada H3A 2M8.4Available 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 to the standards Do
15、cument Summary page onthe ASTM website.6The 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 3.Terminology3.1 DefinitionsRefer to Terminology D2946.4.Summary of
16、 Test Method4.1 A weighed specimen of asbestos fiber is dispersed inwater and the dispersion is allowed to flow by gravity througha series of superposed screens which rotate in a horizontalplane.The suspension flows through successively finer screenswhich retain the oversized fibers.The rotation of the screensdistributes the incoming fiber suspension throughout thevessel,and the swirling motion created by the incoming jet ofwater maintains the fibers in suspension and ensures that theyall encoun
