1、Designation: D6040 12Standard Guide toStandard Test Methods for UnsinteredPolytetrafluoroethylene (PTFE) Extruded Film or Tape1This standard is issued under the fixed designation D6040; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the year 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 guide identifies test methods to use in evaluatingunsintered extruded films or tapes manufactured
3、 from polytet-rafluoroethylene.1.2 The values stated in SI units as detailed in IEEE/ASTMSI 10, are to be regarded as standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish a
4、ppro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1This test method is equivalent to ISO 12086-2:2006 in themeasurement of tensile properties, specific gravity, and dielectric constant.These are in ISO 12086-2:2006, sections 8.2.2, 1
5、0.6 and 8.1.1. It is notequivalent to ISO 12086-2:2006 in any other measurement or section2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for A
6、C Loss Characteristics and Permit-tivity (Dielectric Constant) of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD374 Test Methods for Thickness of Solid Electrical Insu-lationD792 Test Methods for Density and Specific Gravity (Rela-tive Density)
7、of Plastics by DisplacementD882 Test Method for Tensile Properties of Thin PlasticSheetingD883 Terminology Relating to PlasticsD1711 Terminology Relating to Electrical InsulationD3776 Test Methods for Mass Per Unit Area (Weight) ofFabricF335 Terminology Relating to Electrostatic ImagingF412 Terminol
8、ogy Relating to Plastic Piping SystemsIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System2.2 ISO Standard:ISO 12086-2:2006 PlasticsFluoropolymer Dispersionsand Moulding and Extrusion MaterialsPart 2: Prepara-tion of Test Specimens and Determination of
9、Properties33. Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Test Methods D257and Terminologies D883 and D1711, unless otherwise speci-fied.3.1.2 apparent density, nthe weight per unit volume of amaterial including voids inherent in the material as tested, seeTerminology F412.3.
10、1.3 lot, none production run, or uniform blend of two ormore production runs.3.2 Definitions of Terms Specific to This Standard:3.2.1 film, nfull-width material received as finished film.3.2.2 tape, nmaterial that has been slit from the finishedfilm.3.2.3 volume resistivity, nthe volume resistance (
11、in ohm-centimetres) between opposite faces of a material where thevalues are obtained by the measure of resistance to electricalcurrent between electrodes placed in contact with the opposingsurfaces of the sample (see Terminology F335).4. Test Specimens4.1 The number of test specimens shall be in ac
12、cordancewith the requirements of the individual test methods.5. Conditioning5.1 Condition the tape for 4 h and conduct tests at thestandard laboratory temperature of 23 6 2C 73.4 6 3.6F,1This guide is under the jurisdiction of ASTM Committee D20 on Plastics andis the direct responsibility of Subcomm
13、ittee D20.15 on Thermoplastic Materials.Current edition approved Aug. 1, 2012. Published September 2012. Originallyapproved in 1996. Last previous edition approved in 2006 as D6040 - 06. DOI:10.1520/D6040-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custome
14、r 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 Changes sect
15、ion appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1unless otherwise specified in the test methods or required in aspecification. Since the tape or film does not absorb water, themaintenance of const
16、ant humidity during testing is not impor-tant.6. Width6.1 Determine width measurements using a steel scalehaving divisions at a minimum of 0.5-mm 164-in. intervals.6.2 Test at least one specimen from each lot.6.3 Each test specimen shall be approximately 450 mm 18in. in length. Place the specimens o
17、n a hard smooth surface.Measure the width perpendicular to the edge of the steel scale,at three approximately equally spaced points along the length.6.4 Report the average width in millimetres or inches plusthe maximum and minimum values if they are required by aspecification.7. Thickness7.1 Measure
18、 thickness of the tape and film in accordancewith Test Methods D374. Test Method D shall be the preferredmethod. The force on the foot shall not exceed 300 g. TestMethod B shall not be used as the film is compressible, andthere is no restraint on how much compression is used.NOTE 2Alternate methods
19、and equipment are permitted based ondocumented agreement between producer and buyer.7.2 Report:7.2.1 Report the average thickness to the nearest 0.0025 mm0.0001 in. plus the maximum and minimum, if specified.7.2.2 Report the test method from Test Methods D374 ifother than Test Method D is used.8. Te
20、nsile Properties8.1 Determine tensile strength and elongation in accordancewith Test Methods D882. Calculate tensile strength and per-centage elongation from the values at the maximum load.NOTE 3Unsintered PTFE does not exhibit a clean break as is normalfor most thin plastic sheeting.NOTE 4In some i
21、ndustries elongation at material rupture is importantto process control. In such cases it is permissible to include thisinformation as well when agreed to between producer and buyer.8.2 Randomly select five specimens per lot and test.8.3 Report:8.3.1 Report the average tensile strength and the minim
22、umand maximum values in megapascals (MPa) (pound-force persquare inch (psi).8.3.2 Report the average percentage elongation at maximumload and the minimum and maximum values.9. Specific Gravity (Relative Density)9.1 Determine specific gravity in accordance with TestMethod A of Test Methods D792. Othe
23、r equipment shown togive comparable results may be used.NOTE 5Test Methods D792 can generally be used as PTFE film ortape typically exhibits hydrophobic characteristics.NOTE 6Especially useful for this test, has been the electronicdensimeter, Model ED-120 T.4NOTE 7A volume method (apparent density)
24、may be used providingthat the testing error is held to less than one third of the total allowablevariance. Calculate the density as follows:D 5 Wg/V (1)where:D = apparent density of the specimen, g/cm3,Wg= weight of specimen, g, andV = volume of specimen, cm3.9.2 Test one specimen for each lot.10. R
25、esidual Extrusion Aids or Other VolatileComponents10.1 Determine the percentage of volatile material using aminimum 35-gram sample and test temperature 218 6 5C(425 6 10F), and test for 1.5 hours. Allow sample to cool fora minimum of 30 minutes in an environment that preventscondensation. Calculate
26、the loss using the pre and post-heatedsample weights and a 0.0001 gram analytical balance.NOTE 8Commercially available equipment designed to performvolatile testing is acceptable in place of this test method.10.2 Test one specimen for each lot.11. Dielectric Constant11.1 This test method covers the
27、determination of relativepermittivity of electrical insulating materials and should beperformed in accordance with Test Methods D150 using amicroelectrode system at a frequency of 1 MHz.NOTE 9The results are offered as proof of consistency of lot to lot ofmaterial that usually is to be processed fur
28、ther. The processing may resultin significant change in the dielectric constant. The test results, therefore,are used primarily to ensure product uniformity of the film or tape asreceived.11.2 Test one specimen per lot.12. Volume Resistivity12.1 Perform the test in accordance with Test MethodsD257.N
29、OTE 10The results are offered as proof of consistency of lot to lot ofmaterial that usually is to be processed further. The processing may resultin significant change in the dielectric constant. The test results, therefore,are used primarily to ensure product uniformity of the film or tape asreceive
30、d.12.2 Randomly select one specimen per lot and test.13. Dielectric Breakdown Voltage13.1 Determine the dielectric breakdown voltage in accor-dance with Test Method A, Short Time Test of Test MethodsD149.13.2 Randomly select five specimens per lot and test.4The sole source of supply of the apparatus
31、 known to the committee at this timeis Testing Machines, Inc., 400 Bayview Avenue, Amityville, NY 11701. If you areaware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Your comments will receive careful consideration at a meetingof the responsible tech
32、nical committee,1which you may attend.D6040 12213.3 The voltage rate of rise shall be 500 V/s.13.4 Perform the test in air at standard laboratory conditionsunless otherwise specified.13.5 Use Type 3 electrodes as described in Table 1 of TestMethod D149 shall be used.13.6 Give special attention to th
33、e hazards listed in TestMethods D149.NOTE 11Dielectric breakdown voltage may not be applicable to sometapes due to width constraints.14. Unit Weight14.1 Determine unit weight in accordance with Test Meth-ods D3776.14.2 Randomly select one specimen per lot and test.15. Keywords15.1 dielectric breakdo
34、wn voltage; dielectric constant; elon-gation; lubricated PTFE; paste extruded PTFE; PTFE; specificgravity; tensile properties; unsintered PTFE; virgin; volatiles;volume resistivitySUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue, D
35、6040 - 06,that may impact the use of this standard. (August 1, 2012)(1) Removed reference to withdrawn standard D2288 from 2.1.(2) Revised wording in 10.1 and added Note 8.(3) Added Note 2, and re-numbered subsequent notes.(4) Corrected spelling of hydrophobic in revised Note 5.ASTM International ta
36、kes 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 r
37、esponsibility.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 addre
38、ssed 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 t
39、he 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6040 123
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