1、Designation: D4969 17Standard 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 revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers glass fabric impregnated,coated, and sintered on both sides with PTFE to a nominalthickness of 0.318 mm (0
3、.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
4、IEEE/ASTMSI-10.NOTE 1There is no ISO standard that covers information included inthis specification. The dielectric test is mentioned in ISO 12086-2 andISO 130001 and 2.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establi
5、shed 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 Dielect
6、ric Breakdown 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 Gre
7、ige Woven 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 Electric
8、al InsulationD1424 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 Units (SI)
9、: The Modern Metric System2.2 ISO Standard:3ISO 12086-2 PlasticsFluoropolymer Dispersions andMoulding and Extrusion MaterialsPart 2: Preparation ofTest Specimens and Determination of PropertiesISO 130001 and 2 PlasticsPolytetrafluoroethylene(PTFE) Semi-Finished Products3. Terminology3.1 Definitions:
10、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 fabricPTFE-coated fabric to a thicknessof greater
11、 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 re
12、defined cells to refer tospecific aspects of this specification, as illustrated below asfollows.SpecificationStandard NumberBlockType Grade Class SpecialNotesExample: ASTM D4969-XX IV ,1This specification is under the jurisdiction of Committee D20 on Plastics and isthe direct responsibility of Subco
13、mmittee D20.15 on Thermoplastic Materials.Current edition approved Sept. 1, 2017. Published September 2017. Originallyapproved in 1989. Last previous edition approved in 2012 as D4969 07(2012).DOI: 10.1520/D4969-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
14、Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.*A Summary of Chang
15、es section appears at the end of 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 Deci
16、sion on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1For this example, the line call out would be: ASTMD4969 XX, IV , Porosity 1530 CFM, and would specifya Type IV porous produ
17、ct 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 thestandard number and the type. Separators are not neededbetween the type, grade, and class because they are, in turn,Roman numerals, Arabic
18、 digits, and uppercase letters, asprovided in Section B8 of Form and Style for ASTM Standards.Provision for “Special Notes” is included so that other infor-mation can be provided when required. An example would bein this specification where porosity would be defined as 1530CFM. When special notes ar
19、e used, they shall be preceded bya comma.5. Materials and Manufacture5.1 Glass FabricThe base material used in the manufac-ture of the products of this specification shall be a woven glassfabric produced in accordance with Specification D579.Aguideline for generally acceptable substrate fabrics for
20、thecommon thickness of PTFE/glass fabric products is given inTable 2.5.2 CoatingThe glass fabric is impregnated or coated withpolytetrafluoroethylene in accordance with SpecificationD4441. When necessary, use additives to aid the dispersion toachieve the required properties and performance of the fi
21、nalproduct.6. Physical Requirements6.1 The coating shall penetrate and adhere to the fabric andshall be substantially free of wrinkles, creases, blisters, andother imperfections.6.2 Color:6.2.1 The material will have a natural color that varies fromoff-white to dark brown when viewed by the unaided
22、eye. Theusual color is tan.6.2.2 If color is required by the customer, specify it.6.2.3 Color will be uniform from roll to roll within a lot.6.2.4 Other colors for products that contain pigments,fillers, and additives will be agreed upon between the suppliersand the customers.6.3 ThicknessThe thickn
23、ess of the glass fabric is depen-dent on glass style and percent PTFE coating. Tolerances aretypically 610 % of the finished thickness. Thickness shall betested in accordance with Test Methods D374.NOTE 2Typically, glass and coated glass products are manufactured toa weight per unit area.6.4 Breakin
24、g StrengthWhen tested in accordance withMethods D902, the breaking strength shall be at least 80 % ofthe specified value stated in Table 6 of Specification D579.NOTE 3Reduction of tensile strength is due to added heat required forcoating.6.5 Edge Tear Strength(Elmendorf) Tears shall be testedin acco
25、rdance with Test Method D1424. Tear values aredependent upon glass style and additives added to the PTFE.Typical Tear Resistant (Type 5) products exhibit two times thevalues of their counterparts. Conductive (Type 6) productsexhibit one half the values of their counterparts. Test valuesand tolerance
26、s shall be determined by the supplier and thecustomer.6.6 MassA sample shall be prepared in accordance withMethod D751. The amount of PTFE added shall be agreedupon between the customer and the supplier and shall have atolerance of 65 % of the total coated product weight.6.7 WidthsThe coated glass f
27、abric shall be furnished in thewidths and tolerances indicated in Table 3, when tested inaccordance with Method D751.TABLE 1 PTFE-Coated Glass Fabric TypesType Name General Description and Common ApplicationI Premium Smooth, defect-free, primarily used as a dielectric application, release sheet,and
28、Military Specification material.II Standard Regular-grade material primarily used for mechanical applications wheretemperature and easy-release characteristics are required.III Mechanical Regular-grade material primarily used for mechanical applications wheresmoothness is not a critical requirement.
29、IV Porous Permeable material, with a range of porosity primarily used as a release sheet inmolding.V Tear resistant Smooth, flexible, and tear-resistant material for mechanical applications requiringflexible materials.VI Conductive Regular-grade material primarily used for static discharge.TABLE 2 A
30、cceptable Substrate Fabrics for Common Thickness ofPTFE Glass Fabric ProductsPTFE/Glass Fabrics Thickness.Generally Acceptable Woven GlassFabrics Style Numbermm (in.)0.051 (0.002) 104, 1060.076 (0.003) 108, 10800.102 (0.004) 112, 113, 21130.127 (0.005) 116, 1165, 2116, 21650.152 (0.006) 116, 1165, 2
31、1160.203 (0.008) 125, 1528, 76280.254 (0.010) 128, 1528, 76280.356 (0.014) 141, 1142, 3781TABLE 3 Widths of PTFE-Coated Glass FabricNominal Widths Tolerancesmm (in.) mm (in.)3.17 to 12.7 (18 to 12) 0.397 (164)12.7 to 38.1 (12 to 112) 0.794 (132)38.1 to 76.2 (112 to 3) 1.587 (116)76.2 to 305 (3 to 12
32、) 1.411 (18 )305 or greater (12 or greater) 6.35 (14 )D4969 1726.8 ConductivityFor Type 6 material, conductivity shallbe tested in accordance with Test Methods D257, using the FlatMetal Plate Method, and a comparison bridge. Material shallbe deemed conductive when the resistivity is below 106/square
33、.6.9 Dielectric BreakdownType I only.6.9.1 Dielectric Breakdown VoltageWhen tested in accor-dance with Test Methods D149 and Methods D902, with a14-in. electrode, the dielectric breakdown voltage for thevarious thickness shall be as specified in Table 4.6.9.2 Dielectric Breakdown After HeatingAfter
34、exposureto a temperature of 150C (302F) for 12 h, the average valueof five samples shall be not less than 80 % of the valuedetermined before exposure.6.10 LengthThe length of the products of this specifica-tion shall be furnished in rolls or in sheets. Typical roll lengthsare 40 to 80 m (43.7 to 87.
35、5 yd) and 16 to 65 m (17.5 to 71.1yd).6.11 Percent PTFEWhen required in the purchase orderor contract, the supplier shall provide the ratio by weight of thefluoropolymer coating to the total weight of the finishedproduct using the following formula:total weight 2 bare glass weighttotal weight3100 (1
36、)where:total weight = as calculated in 6.6 of this specifica-tion.bare glass weight = as specified in Table 6 of SpecificationD579.6.12 Smoothness, Type I Material Smoothness shall betested using a profilometer, or equivalent, capable of measuringthe average roughness to the nearest microinch.6.12.1
37、 Three samples shall be measured across the width ata 45 angle to the weave. The length of measurement shall begreater than12 in.6.12.2 Record the reading from each measurement. Averagethe recorded results and report the average value in micro-inches. Smoothness values and tolerances shall be determ
38、inedbetween the customer and the supplier.6.13 Porosity, Type IV MaterialPorosity shall be mea-sured in accordance with Test Method D737.6.13.1 Porosity values and tolerances shall be determinedbetween the customer and the supplier.7. Sampling7.1 Sampling shall be statistically adequate to satisfy t
39、herequirements of 9.1.7.2 A random sample of roll or sheet shall be selected fromeach lot for visual, dimensional, and weight inspection.7.3 Visual InspectionAt least ten yards of the roll selectedin accordance with 7.2 shall be unwound and inspected forcompliance with 6.1.8. Conditioning and Test C
40、onditions8.1 ConditioningBecause of the nature of these materials,conditioning has little merit; however, if conditioning isdesired, use Procedure A of Method D618 for a period of 4 hprior to test.8.2 Test ConditionsUnless otherwise specified, conducttests at the standard laboratory temperature of 2
41、3 6 3C (68 to79F) and relative humidity of 50 to 70 %.9. Conformance9.1 Due to the various suppliers and customer requirements,color, thickness, breaking strength, edge tear, conductivity,percent PTFE, smoothness, and porosity can not be realisticallyspecified in a table. However, when measuring the
42、seproperties, these test methods must be used to ensure consis-tency in measurements and comparisons between and amongsuppliers and users.9.2 Upon request, a manufacturers certification that thematerial was manufactured and tested in accordance with thisspecification together with a report of the te
43、st results shall befurnished.10. Packaging and Package Marking10.1 PackagingThe materials shall be packaged in stan-dard commercial containers constructed so as to ensure accep-tance by common carrier, unless otherwise specified in thecontract or order.10.2 Package MarkingShipping containers shall b
44、emarked with the name of the material, type, thickness, andquantity contained therein. Each roll or package of sheets shallbe marked to designate type and lot number.10.3 All packaging and marking provisions of PracticeD3892 shall apply to this specification.11. Keywords11.1 dispersion; fluorocarbon
45、; fluoropolymers; polymercoating; polytetrafluoroethylene; PTFE; PTFE coated glassfabricTABLE 4 Electrical Properties of PTFE-Coated Glass FabricATypeThickness Dielectric Breakdownmm (in.) Volts, minType 1 0.051 (0.002) 10000.076 (0.003) 25000.102 (0.004) 33000.127 (0.005) 39000.152 (0.006) 43000.20
46、3 (0.008) 47000.054 (0.010) 52000.356 (0.014) 7500AOnly Type 1 is applicable.D4969 173SUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue(D4969 - 07(2012) that may impact the use of this standard. (September 1, 2017)(1) Added style 37
47、81 to Table 2.(2) Fixed typo in line 2 of Table 3. Read as12 in. not 1-12 in.(3) Added additional typical length to 6.10.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expres
48、sly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,
49、 either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International,
