1、Designation:D299/D299M04(Reapproved 2017)Standard Specification forAsbestos Yarns1This standard is issued under the fixed designation D299/D299M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in pa
2、rentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers asbestos yarns having a mini-mum of 75%
3、asbestos fiber by mass,excluding the mass ofother inorganic reinforcing strands which may be present.1.2 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 i
4、ndependently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 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 oth
5、er precautions,when working with 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.”21.4 The following safety hazards caveat pertains only to thetest meth
6、ods,Section 13,described in this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory lim
7、ita-tions prior to use.See 1.3 for a specific safety hazardstatement.1.5 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-me
8、ndations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD861 Practice for Use of the Tex System to Designate LinearDensity of Fib
9、ers,Yarn Intermediates,and YarnsD1118 Test Method for Magnetic Rating of Asbestos Fiberand Asbestos TextilesD1423 Test Method for Twist in Yarns by Direct-CountingD1918 Test Method for Asbestos Content of Asbestos Tex-tilesD2100 Specification for Asbestos Textiles Used for Electri-cal Insulating Pur
10、posesD2260 Tables of Conversion Factors and Equivalent YarnNumbers Measured in Various Numbering SystemsD2946 Terminology for Asbestos and AsbestosCementProducts3.Terminology3.1 For definitions of other textile terms used in thisspecification,refer to Terminology D123.For asbestos terms,refer to Ter
11、minology D2946.3.2 Definitions:3.2.1 asbestos,n1.generala group of impure silicateminerals occurring in fibrous form.2.textilethe hydrousmagnesiumsilicateserpentinemineraldesignatedaschrysotile,and having the empirical formula Mg3Si2O5(OH)4.3.2.2 asbestos yarn construction number,na system ofnumbers
12、 designed to show the construction,namely,the cut ofthe single yarn,the number of plies,and whether reinforce-ments are present.3.2.2.1 DiscussionYarns up to 9-cut,inclusive,have3-digit construction numbers;the first digit indicates the cut,the second digit the number of plies,and the third digit,th
13、enumber of reinforcements.Yarns of 10-cut and over have4-digit construction numbers;the first 2 digits indicate the cut,the third digit,the number of plies,and the fourth digit,the1This specification is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct
14、 responsibility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved June 1,2017.Published July 2017.Originally approvedin 1928.Last previous edition approved in 2009 as D299/D299M 04(2009)1.DOI:10.1520/D0299_D0299M-04R172Available from The Asbestos Instit
15、ute,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 Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C7
16、00,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 number of reinforcements.Yarns containing reinforcement are designated by the yarnconstruction number followed by the description of the
