1、Designation:D299/D299M04(Reapproved 2009)1Standard 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 p
2、arentheses 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.1NOTEUnits information was corrected editorially in March 2010.1.Scope1.1 T
3、his specification covers asbestos yarns having a mini-mum of 75%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 m
4、ay 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.1.3 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks for users a
5、nd 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 chrysoltile asbestos,refer to“Safe Useof Chrysotile Asbestos:A Manual on Preventive and ControlMeasures.”21.4 T
6、he following safety hazards caveat pertains only to thetest methods,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 h
7、ealthpractices and determine the applicability of regulatory limita-tions prior to use.See 1.3 for a specific safety hazardstatement.2.Referenced Documents2.1 ASTM Standards:3D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD861 Practice for Use of the
8、Tex System to Designate LinearDensity of Fibers,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
9、Textiles Used for Electri-cal Insulating PurposesD2260 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 Term
10、inology D123.For asbestos terms,refer to Terminology 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
11、yarn construction number,na system ofnumbers 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 digi
12、t the number of plies,and the third digit,thenumber of reinforcements.Yarns of 10-cut and over have1This specification is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Productsand is the direct responsibility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Access
13、ories.Current edition approved Nov.1,2009.Published March 2010.Originallyapproved in 1928.Last previous edition approved in 2004 as D299 041.DOI:10.1520/D0299_D0299M-04R09E012Available from The Asbestos Institute,http:/ referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cus
14、tomer 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 C700,West Conshohocken,PA 19428-2959.United States1 4-digit construction numbers;the first 2
15、digits indicate the cut,the third digit,the number of plies,and the fourth digit,thenumber of reinforcements.Yarns containing reinforcement are designated by the yarnconstruction number followed by the description of thereinforcing strands.Examples:No.1010 yarn10-cut,single,no reinforcementNo.1420 y
16、arn14-cut,2-ply,no reinforcementNo.931 yarn9-cut,3-ply,1 reinforcement(as specified)When wire is the reinforcement the cut indicates the yardsper pound of asbestos yarn only(mass of the wire not in-cluded).When the reinforcement is other than wire,the cutindicates the yards per pound of the complete assembly.3.2.3 atmosphere for testing asbestos textiles,nair main-tained at a relative humidity of 50 6 2%at 21 6 1C.3.2.4 cut(asbestos),nthe number of 100-yd lengths/lb453.6 g of asbestos yarn.3.2.4
