1、Designation: D3308 12Standard Specification forPTFE Resin Skived Tape1This standard is issued under the fixed designation D3308; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses ind
2、icates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification covers skived tape in thicknessesfrom 0.013 to 6.35 mm (0.0
3、005 to 0.250 in.) manufactured byskiving (Note 1) from PTFE resin molding and extrusionmaterials.NOTE 1Skiving is the process of continuously shaving a film on alathe from the outer surface to the core of a molded cylindrical tube ofmaterial.NOTE 2Abbreviations have been approved from Terminology D1
4、600.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are for informa-tion only.1.3 The following hazard caveat pertains only to the testmethod portion, Section 8, of this specification: This standarddoes not purport to address all of the safety
5、 concerns, if any,associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.NOTE 3This specification and ISO 13000-1 and ISO 13000-2 differ inapproach or deta
6、il, and data obtained using either may not be technicallyequivalent.2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD374 Test Methods for Thickness of Solid Elec
7、trical Insu-lationD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD882 Test Method for Tensile Properties of Thin PlasticSheetingD883 Terminology Re
8、lating to PlasticsD1389 Test Method for Proof-Voltage Testing of Thin SolidElectrical Insulating MaterialsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3892 Practice for Packaging/Packing of PlasticsD4894 Specification for Polytetrafluoroethylene (PTFE)Granular Molding and Ram Extrusi
9、on Materials2.2 ISO Standards:ISO 13000-1 PlasticsPolytetrafluorethylene (PTFE) Semi-Finished Products Part 1: Requirements and Designation3ISO 13000-2 PlasticsPolytetrafluorethylene (PTFE)Semi-Finished Products Part 2: Preparation of Specimensand Determination of Properties33. Terminology3.1 Defini
10、tions:Definitions are in accordance with Terminology D883 unlessotherwise specified.3.2 Definitions of Terms Specific to this Standard:3.2.1 lot, nOne production run, or a uniform blend of twoor more production runs.3.2.2 film, nfull-width material received as finished film.3.2.3 Mil, n11000 (0.001)
11、 of an inch.4. Classification4.1 This specification covers four types of PTFE resinskived tape:4.1.1 Type IPremium; normally used for exactingelectrical, mechanical, or chemical applications.4.1.2 Type IIGeneral purpose; for electrical, mechanical,and chemical applications not requiring premium mate
12、rial.4.1.3 Type IIICommercial; for non-critical chemical,electrical, and mechanical applications.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials (Section D20.15.12).Current edition approv
13、ed Aug. 1, 2012. Published September 2012. Originallyapproved in 1974. Last previous edition approved in 2006 as D3308 - 06. DOI:10.1520/D3308-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards
14、 volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute, 25 W. 43rd St., 4thFloor, New York, NY 10036.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Driv
15、e, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.4 Type IVUtility; having no electrical requirements,and with mechanical properties at lower level.4.2 Types I, II, III, and IV may be subdivided into twogrades in accordance with the base resin used as follows:4.2.1 Grade 1Made only
16、 from virgin resin.4.2.2 Grade 2May be made using reprocessed resin, or amixture of virgin and reprocessed resin.4.3 A one-line system may be used to specify materialscovered by this specification. The system uses predefined cellsto refer to specific aspects of this specification, as illustratedbelo
17、w:SpecificationStandard Number : Type :Grade : Class : SpecialBlock : : : : Notes: ,Example: Specification D3308 06 I 2 . .For this example, the line callout would be: SpecificationD3308 06, I2, Oil and would specify a skived tape that has allof the properties listed for that Type and Grade, in thea
18、ppropriate specified properties, tables, or both, in the specifi-cation identified.Acomma is used as the separator between theStandard number and the Type. Separators are not neededbetween the Type and Grade, because they are, in turn, Romannumerals and Arabic digits.4Provision for “Special Notes” i
19、sincluded so that other information can be provided whenrequired. This example would be premium PTFE tape withoutspecial requirements. When Special Notes are used, theyshould be preceded by a comma.5. Physical Requirements5.1 The tape shall be made from unpigmented PTFE resin.5.2 The length and widt
20、h of the roll shall be as agreed uponbetween the purchaser and the seller. Width tolerances shall bein accordance with Table 1.5.3 The melting point for all types of tape shall be 327 610C (621 6 18F).5.4 The thickness tolerances for skived tape shall be asshown in Table 2.5.5 Tensile strength and e
21、longation shall meet the require-ments shown in Table 3.5.6 The requirements for specific gravity shall be as shownin Table 3.5.7 The minimum required values for dielectric strength S(V/mil), shall be computed for applicable thicknesses ofmaterials in accordance with the following formulas, where t
22、isthe thickness of the tape in mils.Type I: S = 1000 times square root of (20/t)Type II (thickness $0.003 in.): S = 840 times square root of(20/t)Type II (thickness 3.175 0.1250 0.254 0.0100D3308 122NOTE 4Use of alternate methods or equipment for the measurementof thickness is permitted with agreeme
23、nt between producer and buyer.8.1.5 Tensile PropertiesDetermine the tensile strength andpercentage elongation at break in accordance with Test MethodD638, for tapes or films 1.0 mm (0.04 in.) thick or greater,using Type I specimen at 20 in./min 6 10 %. For tapes or filmsless than 1.0 mm (0.04 in.) t
24、hick, determine the tensile strengthand percentage elongation at break in accordance with TestMethod D882.8.1.6 Dielectric StrengthDetermine the dielectric strengthin accordance with Test Methods D149 using the short timetest. Use air as the test medium for tapes up to and including0.254 mm (0.010 i
25、n.) in thickness. For tapes greater than 0.254mm (0.010 in.) thick, or where specimen configuration couldresult in flashover or partial discharge (corona) during the test,the test medium shall be oil. Use three specimens in determin-ing the dielectric strength of each lot of tape.”NOTE 5Dielectric v
26、alues obtained in oil is a requirement for thelaminate industry. Therefore, it is necessary to test dielectric strength in oilwhen requested by these customers. Values obtained when testing thinskived tape in oil are significantly different than those obtained using theair method.8.1.7 Specific Grav
27、ityDetermine the specific gravity ontwo specimens in accordance with Method A of Test MethodsD792.Add 2 drops of a wetting agent (liquid detergent or othersurfactant) to the water in order to reduce the surface tensionand ensure complete wetting of the sample.8.1.8 Electrical FlawsUse Test Method D1
28、389 for thedetermination of electrical flaws.9. Inspection9.1 Inspection and certification of the material supplied withreference to a specification based on this classification systemshall be for conformance to the requirements specified herein.9.2 Lot-acceptance shall be the basis on which accepta
29、nceor rejection of the lot is made. Lot-acceptance testing shallconsist of the tests seen in Section 89.3 Periodic check inspection with reference to a specifica-tion based on this classification system shall consist of the testsfor all requirements of the material under the specification.9.4 Certif
30、ication shall be that the material was manufacturedby a process in statistical control, sampled, tested, and in-spected in accordance with this classification system, and thatthe average values for the lot meet the requirements of thespecification (line callout).9.5 A report of test results shall be
31、 furnished when re-quested. The report shall consist of results of the lot-acceptanceinspection for the shipment and the results of the most recentperiodic-check inspection.10. Packaging and Marking10.1 PackagingThe material shall be packaged in stan-dard commercial containers so constructed as to e
32、nsure accep-tance by common or other carriers for safe transportation at thelowest rate to the point of delivery, unless otherwise specifiedin the contract or order.10.2 MarkingShipping containers shall be marked withthe name of the material, type, size, and quantity containedtherein. Each roll of t
33、ape shall be marked to designate type,grade, and lot number. The marking will be, preferably, on thecore.10.3 All packing, packaging, and marking provisions ofPractice D3892 shall apply to this specification.10.4 Packaging and marking requirements defined by thepurchaser shall take precedence over t
34、he above.11. Keywords11.1 fluorocarbon polymer; fluoropolymers; granular PTFE;polytetrafluoroethylene; PTFE; PTFE basic shapes; PTFE film;PTFE skived tapeSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue (D3308 -06) that may impact
35、the use of this standard. (August 1, 2012)(1) Reworded 5.8.(2) Added Note 4, and re-numbered Note 5.(3) Reworded 8.1.8.TABLE 3 Mechanical Requirements for Skived TapeTypeTensile Strength,AminElongation,min,%SpecificGravityMPa psiI 27.58 4000 300 2.14 to 2.19II 19.31 2800 200 2.14 to 2.19III 11.00 16
36、00 75 2.14 minIV 9.66 1400 50 2.14 minATape 6.35 mm (14 in.) or wider.D3308 123ASTM 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 expressly advised that determination of the vali
37、dity 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, either reapproved or withdrawn. Your comm
38、ents 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
39、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, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple c
40、opies) 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/).D3308 124
