1、Designation:D2752/D2752M88(Reapproved 2019)Standard Test Methods forAir Permeability of Asbestos Fibers1This standard is issued under the fixed designation D2752/D2752M;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.1.Scope1.1 These test methods cover the measurement of therelative degree of openness or degree of fiberization of milledasbestos fiber by
3、 air permeability instruments.1.2 Method A is the recommended procedure and describesa determination by means of the Rapid SurfaceArea apparatus.This test method is limited to fibers with an effective surfacearea in the range from 10 to 250 dm2/g 490 to 12 000 ft2/lb.1.3 Method B is an alternative p
4、rocedure and covers the useof the Dyckerhoff apparatus.This test method is limited tofibers within the range from 10 to 600 Dyckerhoff seconds.1.4 Only those asbestos specimens which are of similarspecific gravities will bear strict comparison by these airpermeability methods since differences in de
5、nsity result inspecimens being tested under different conditions of porosity.1.5 Samples containing excessive quantities of nonfibrousparticles or contaminants will not give reliable or meaningfulresults.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as sta
6、ndard.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.1.7 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products prese
7、nt 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 chrysotile asbestos,refer to“Safe Use ofChrysotile:A Manual on Preventiv
8、e and Control Measures.”21.8 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,health,and environmental practices and deter-mine the applicability of regulatory limi
9、tations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization
10、TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D2590 Test Method for Sampling Chrysotile AsbestosD3879 Test Method for Sampling Amphibole Asbestos(Withdrawn 2009)4E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Pr
11、ecision and Bias inASTM Test Methods2.2 Other Standard:5NNN-P-1475B Federal Specification for Paper,Filter,Ana-lytical3.Summary of Test Methods3.1 In both test methods the resistance to air flow of acompressed specimen of fixed weight and volume is deter-mined.3.2 Test Method A:3.2.1 The apparatus i
12、s arranged so that the total resistance toair flow remains equal to a fixed hydraulic pressure head.Totalresistance includes the resistance of the specimen and thepressure drop across a calibrated capillary tube of knownresistance.The contribution of the specimen to total resistanceis measured on a
13、manometer calibrated in specific surface areaunits.1These test methods are under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and are the direct responsibility of Subcommit-tee C17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved April 15,201
14、9.Published May 2019.Originallyapproved in 1968.Last previous edition approved in 2011 as D2752 88(2011)1.DOI:10.1520/D2752_D2752M-88R19.2Available from The Asbestos Institute,http:/ referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For
15、Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.5Available from the Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20402.Copyri
16、ght ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.2 Optional calibration of the manometer in equivalentDyckerhoff seconds,which
