1、Designation:D496917(Reapproved 2022)Standard Specification forPolytetrafluoroethylene(PTFE)Coated Glass Fabric1This standard is issued under the fixed designation D4969;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、 revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers glass fabric impregnated,coated,and sintered on both sides with PTFE to a nominalthickness of 0.318 m
3、m(0.015 in.)or less.1.2 The PTFE-coated glass fabric is for electrical,chemical,and mechanical uses.1.3 The PTFE-coated glass fabric of this specification doesnot pertain to structural fabric,single-sided PTFE coatings,ormaterials used for laminates.1.4 The values stated in SI units as detailed in I
4、EEE/ASTMSI-10.NOTE1There is no ISO standard that covers information included inthis specification.The dielectric test is mentioned in ISO 12086-2 andISO 13000-1 and-2.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establish
5、ed in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD149 Test Method for Dielectric Br
6、eakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD374 Test Methods for Thickness of Solid Electrical Insu-lation(Metric)D0374_D0374MD579 Specification for Greige Wove
7、n Glass FabricsD618 Practice for Conditioning Plastics for TestingD737 Test Method for Air Permeability of Textile FabricsD751 Test Methods for Coated FabricsD883 Terminology Relating to PlasticsD902 Test Methods for Flexible Resin-Coated Glass Fabricsand Glass Fabric Tapes Used for Electrical Insul
8、ation(Withdrawn 2020)3D1424 Test Method for Tearing Strength of Fabrics byFalling-Pendulum(Elmendorf-Type)ApparatusD3892 Practice for Packaging/Packing of PlasticsD4441 Specification for Aqueous Dispersions of Polytetra-fluoroethyleneIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Uni
9、ts(SI):The Modern Metric System2.2 ISO Standard:4ISO 12086-2 PlasticsFluoropolymer Dispersions andMoulding and Extrusion MaterialsPart 2:Preparation ofTest Specimens and Determination of PropertiesISO 13000-1and-2 PlasticsPolytetrafluoroethylene(PTFE)Semi-Finished Products3.Terminology3.1 Definition
10、s:3.1.1 Definitions of terms relating to plastics used in thisspecification shall be in accordance with Definitions D883.Definitions of terms relating to textiles used in this specifica-tion shall be in accordance with Terminology D123.3.1.2 structural fabric,nPTFE-coated fabric to a thick-ness of g
11、reater than 0.381 mm(0.015 in.).3.1.3 lot,none production run or a uniform blend of twoor more production runs.4.Classification4.1 There shall be six types of PTFE-coated glass fabrics asdescribed in Table 1.4.2 Use a one-line system to specify materials covered bythis specification.The system uses
12、redefined cells to refer tospecific aspects of this specification,as illustrated below asfollows.1This specification is under the jurisdiction of Committee D20 on Plastics and isthe direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.Current edition approved May 1,2022.Published
13、May 2022.Originallyapproved in 1989.Last previous edition approved in 2017 as D4969 17.DOI:10.1520/D4969-17R22.2For 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 standa
14、rds Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end o
15、f this standardCopyright 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 theDevelopmen
16、t of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1SpecificationStandard NumberBlockTypeGradeClassSpecialNotesExample:ASTM D4969-XXIV,For this example,the line call out would be:ASTMD4969 XX,IV ,Porosity 1530 CFM,and would specifya Type IV porous product which is referenced in Table 1 withno grade or class since these subcategories do not appear in thisspecification.A comma is used as the separator between the