1、Designation: D 4969 07Standard Specification forPolytetrafluoroethylene(PTFE) Coated Glass Fabric1This standard is issued under the fixed designation D 4969; 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 (e) 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
3、 (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
4、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:2D 123 Terminology Relating to TextilesD 149 Test Method for Dielectric Breakdown Volt
5、age andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD 374 Test Methods for Thickness of Solid Electrical Insu-lationD 579 Specification for Greige Woven Glass FabricsD 618 Practice
6、 for Conditioning Plastics for TestingD 737 Test Method for Air Permeability of Textile FabricsD 751 Test Methods for Coated FabricsD 883 Terminology Relating to PlasticsD 902 Test Methods for Flexible Resin-Coated Glass Fab-rics and Glass Fabric Tapes Used for Electrical InsulationD 1424 Test Metho
7、d for Tearing Strength of Fabrics byFalling-Pendulum Type (Elmendorf) ApparatusD 3892 Practice for Packaging/Packing of PlasticsD 4441 Specification for Aqueous Dispersions of Polytet-rafluoroethyleneIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System3
8、2.2 ISO Standard:4ISO 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 DefinitionsDefinitions of terms relati
9、ng to plasticsused in this specification shall be in accordance with Defini-tions D 883. Definitions of terms relating to textiles used in thisspecification shall be in accordance with Terminology D 123.3.1.1 structural fabricPTFE-coated fabric to a thicknessof greater than 0.381 mm (0.015 in.).3.1.
10、2 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 tospecif
11、ic 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: ASTM D4969 XX, IV , Porosity 1530 CFM, and would specify aType IV porous product which is referenced
12、 in Table 1 with nograde 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,1This specification is under the jurisdictio
13、n of Committee D20 on Plastics and isthe direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.Current edition approved March 1, 2007. Published March 2007. Originallyapproved in 1989. Last previous edition approved in 2002 as D 4969 02.2For referenced ASTM standards, visit the AST
14、M 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 ASTM International, 100 Barr Harbor Drive, West Consho-hocken, PA 194284Available from Ame
15、rican National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.1*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.Roman numerals, Arabic digits,
16、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 are used, t
17、hey should 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 D 579.Aguideline for generally acceptable substrate fabrics for thecomm
18、on thickness of PTFE/glass fabric products is given inTable 2.5.2 CoatingThe glass fabric is impregnated or coatedwith polytetrafluoroethylene in accordance with SpecificationD 4441. When necessary, use additives to aid the dispersion toachieve the required properties and performance of the finalpro
19、duct.6. Physical Requirements 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
20、 by the unaided 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, fill-ers, and additives will be agreed upon between the suppliersand the customers.6.3 T
21、hicknessThe thickness 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 D 374.NOTE 2Typically, glass and coated glass products are manufacturedto a weight per un
22、it area.6.4 Breaking StrengthWhen tested in accordance withMethods D 902, the breaking strength shall be at least 80 % ofthe specified value stated in Table 6 of Specification D 579.NOTE 3Reduction of tensile strength is due to added heat required forcoating.6.5 Edge Tear Strength(Elmendorf) Tears s
23、hall be testedin accordance with Test Method D 1424. 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. Te
24、st valuesand tolerances shall be determined by the supplier and thecustomer.6.6 MassA sample shall be prepared in accordance withMethod D 751. 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 W
25、idthsThe coated glass fabric shall be furnished inthe widths and tolerances indicated in Table 3, when tested inaccordance with Method D 751.6.8 ConductivityFor Type 6 material, conductivity shallbe tested in accordance with Test Methods D 257, using theFlat Metal Plate Method, and a comparison brid
26、ge. Materialshall be deemed conductive when the resistivity is below 106V/square.6.9 Dielectric BreakdownType I only.6.9.1 Dielectric Breakdown VoltageWhen tested in accor-dance with Test Methods D 149 and Methods D 902, with a14-in. electrode, the dielectric breakdown voltage for thevarious thickne
27、ss shall be as specified in Table 4.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 Military Specification material.II Standard Regular-grade material primarily used
28、 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.IV Porous Permeable material, with a range of porosity primarily used as a releas
29、e 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 Acceptable Substrate Fabrics for Common Thicknessof PTFE Glass Fabric ProductsPTFE
30、/Glass Fabrics Thickness.Generally Acceptable WovenGlass 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, 1
31、142TABLE 3 Widths of PTFE-Coated Glass FabricNominal 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)D49690726.9.2 Dielectric Breakd
32、own After HeatingAfter 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
33、40 to 80 m (36 to 72 yd).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 weightbare glass weighttotal weight3 100 (1)where:total we
34、ight = as calculated in 6.6 of this specifica-tion.bare glass weight = as specified in Table 6 of SpecificationD 579.6.12 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
35、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 determinedbetween the
36、 customer and the supplier.6.13 Porosity, Type IV MaterialPorosity shall be mea-sured in accordance with Test Method D 737.6.13.1 Porosity values and tolerances shall be determinedbetween the customer and the supplier.7. Sampling7.1 Sampling shall be statistically adequate to satisfy therequirements
37、 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 Conditions8.1 C
38、onditioningBecause of the nature of these materials,conditioning has little merit; however, if conditioning isdesired, use Procedure A of Method D 618 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 to
39、79F) 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 these proper-tie
40、s, these test methods must be used to ensure 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 sh
41、all 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 bemarked with
42、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 PracticeD 3892 shall apply to this specification.11. Keywords11.1 dispersion; fluorocarbon; fluoropoly
43、mers; polymercoating; polytetrafluoroethylene; 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) 4700
44、0.054 (0.010) 52000.356 (0.014) 7500AOnly Type 1 is applicable.D4969073SUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue(D 4969 - 02) that may impact the use of this standard. (March 1, 2007)(1) Revised Note 1.ASTM International tak
45、es no position respecting the validity 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 re
46、sponsibility.This standard is subject to 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 addres
47、sed 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 th
48、e address shown below.This standard is 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).D4969074
