1、Designation: D4969 07 (Reapproved 2012)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
2、of last revision. 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 nominalthickn
3、ess of 0.318 mm (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 uni
4、ts as detailed in 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 2.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD149 Test Method for Dielectric B
5、reakdown 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-lationD579 Specification for Greige Woven Glass FabricsD618
6、 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 Fab-rics and Glass Fabric Tapes Used for Electrical InsulationD1424 Test M
7、ethod 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): The Modern Metric Syste
8、m2.2 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:3.1.1 Definitions of term
9、s 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 than 0.381 mm (0.015 in.
10、).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 redefined cells to refer to
11、specific aspects of this specification, as illustrated below asfollows.SpecificationStandard NumberBlockType Grade Class SpecialNotesExample: ASTM D4969-XX IV ,For this example, the line call out would be: ASTMD4969 XX, IV , Porosity 1530 CFM, and would specifya Type IV porous product which is refer
12、enced 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 digits, and uppe
13、rcase letters, as1This specification is under the jurisdiction of Committee D20 on Plastics and isthe direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.Current edition approved April 1, 2012. Published June 2012. Originallyapproved in 1989. Last previous edition approved in 200
14、7 as D4969 07. DOI:10.1520/D4969-07R12.2For 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 standards Document Summary page onthe ASTM website.3Available from Americ
15、an National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.provided in Se
16、ction 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 are used, they should be preceded bya comma.5. Mat
17、erials 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 thecommon thickness of PTFE/glass fabric produc
18、ts is given inTable 2.5.2 CoatingThe glass fabric is impregnated or coatedwith polytetrafluoroethylene in accordance with SpecificationD4441. When necessary, use additives to aid the dispersion toachieve the required properties and performance of the finalproduct.6. Physical Requirements Physical Re
19、quirements6.1 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 eye. Theusual color is ta
20、n.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, fill-ers, and additives will be agreed upon between the suppliersand the customers.6.3 ThicknessThe thickness of the glass fabric
21、 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 manufacturedto a weight per unit area.6.4 Breaking StrengthWhen tested i
22、n 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 accordance with Test Method
23、 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 tolerances shall be determined b
24、y 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 fabric shall be furnishe
25、d inthe widths and tolerances indicated in Table 3, when tested inaccordance with Method D751.6.8 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
26、resistivity is below 106V/square.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.TABLE 1 PTFE-C
27、oated Glass Fabric TypesType Name General Description and Common ApplicationI Premium Smooth, defect-free, primarily used as a dielectric application, release sheet,and Military Specification material.II Standard Regular-grade material primarily used for mechanical applications wheretemperature and
28、easy-release characteristics are required.III Mechanical Regular-grade material primarily used for mechanical applications wheresmoothness is not a critical requirement.IV Porous Permeable material, with a range of porosity primarily used as a release sheet inmolding.V Tear resistant Smooth, flexibl
29、e, and tear-resistant material for mechanical applications requiringflexible materials.VI Conductive Regular-grade material primarily used for static discharge.TABLE 2 Acceptable Substrate Fabrics for Common Thicknessof PTFE Glass Fabric ProductsPTFE/Glass Fabrics Thickness.Generally Acceptable Wove
30、nGlass Fabrics 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, 21160.203 (0.008) 125, 1528, 76280.254 (0.010) 128, 1528, 76280.356 (0.014) 141, 1142TABLE 3 Widths of PTFE-Coated Glass FabricNomin
31、al Widths Tolerancesmm (in.) mm (in.)3.17 to 12.7 (18 to 12) 0.397 (6164)12.7 to 38.1 (12 to 12) 0.794 (6132)38.1 to 76.2 (112 to 3) 1.587 (6116)76.2 to 305 (3 to 12) 1.411 (618)305 or greater (12 or greater) 6.35 (614)D4969 07 (2012)26.9.2 Dielectric Breakdown After HeatingAfter exposureto a temper
32、ature 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 (36 to 72 yd).6.11 Percent PTFE
33、When 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 weightbare glass weighttotal weight3 100 (1)where:total weight = as calculated in 6.6 of this specif
34、ica-tion.bare glass weight = as specified in Table 6 of SpecificationD579.6.12 Smoothness, Type I MaterialSmoothness shall betested using a profilometer, or equivalent, capable of measuringthe average roughness to the nearest microinch.6.12.1 Three samples shall be measured across the width ata 45 a
35、ngle 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 determinedbetween the customer and the supplier.6.13 Porosity, T
36、ype 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 therequirements of 9.1.7.2 A random sample of roll or sheet
37、 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 Conditions8.1 ConditioningBecause of the nature of these ma
38、terials,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 23 6 3C (68 to79F) and relative humidity of 50 to 70 %.9. C
39、onformance9.1 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 these proper-ties, these test methods must be used to ensure
40、consistency inmeasurements and comparisons between and among suppliersand users.9.2 Upon request, a manufacturers certification that thematerial was manufactured and tested in accordance with thisspecification together with a report of the test results shall befurnished.10. Packaging and Package Mar
41、king10.1 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 bemarked with the name of the material, type, thickness, an
42、dquantity 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; fluoropolymers; polymercoating; polytetrafluoroethylene;
43、 PTFE; PTFE coated glassfabricTABLE 4 Electrical Properties of PTFE-Coated Glass FabricATypeThicknessDielectricBreakdownmm (in.) Volts, minType 1 0.051 (0.002) 10000.076 (0.003) 25000.102 (0.004) 33000.127 (0.005) 39000.152 (0.006) 43000.203 (0.008) 47000.054 (0.010) 52000.356 (0.014) 7500AOnly Type
44、 1 is applicable.D4969 07 (2012)3SUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue (D4969 - 02)that may impact the use of this standard. (March 1, 2007)(1) Revised Note 1.ASTM International takes no position respecting the validity
45、of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly 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 t
46、o revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, 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.
47、 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
48、copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D4969 07 (2012)4
