ASTM D6040-2018 Standard Guide to Standard Test Methods for Unsintered Polytetrafluoroethylene (PTFE) Extruded Film or Tape.pdf

1、Designation: D6040 12D6040 18Standard 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

2、 revision, 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 evaluating unsintered extruded films or tapes man

3、ufactured from polytetra-fluoroethylene.1.2 The values stated in SI units as detailed in IEEE/ASTM SI 10, are to be regarded as standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to

4、establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.NOTE 1This test method is equivalent to ISO 12086-2:2006 in the measurement of tensile properties, specific gravity, and dielectric constant. Theseare

5、in ISO 12086-2:2006, sections 8.2.2, 10.6 and 8.1.1. It is not equivalent to ISO 12086-2:2006 in any other measurement or section1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the

6、Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Mat

7、erials atCommercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance of Insulating MaterialsD374D374/D374M Test Methods for Thickness of Solid Electrical Insulation (

8、Metric) D0374_D0374MD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD882 Test Method for Tensile Properties of Thin Plastic SheetingD883 Terminology Relating to PlasticsD1711 Terminology Relating to Electrical InsulationD3776D3776/D3776M Test Methods

9、for Mass Per Unit Area (Weight) of FabricF335 Terminology Relating to Electrostatic Imaging (Withdrawn 2017)3F412 Terminology Relating to Plastic Piping SystemsIEEE/ASTM SI 10 Standard for Use of the International System of Units (SI): The Modern Metric System2.2 ISO Standard:ISO 12086-2:2006 Plasti

10、csFluoropolymer Dispersions and Moulding and Extrusion MaterialsPart 2: Preparation of TestSpecimens and Determination of Properties43. Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Test Methods D257 and Terminologies D883 and D1711, unless otherwise specified.1 This guide is u

11、nder the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.Current edition approved Aug. 1, 2012Dec. 1, 2018. Published September 2012December 2018. Originally approved in 1996. Last previous edition approved in 20062012

12、as D6040 - 06.D6040 - 12. DOI: 10.1520/D6040-12.10.1520/D6040-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM webs

13、ite.3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.This document is not an ASTM standard and is intended only to provide the user of

14、 an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as pub

15、lished by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.2 apparent density, nthe weight per unit volume of a materia

16、l including voids inherent in the material as tested, seeTerminology F412.3.1.3 lot, none production run, or uniform blend of two or more 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

17、slit from the finished film.3.2.3 volume resistivity, nthe volume resistance (in ohm-centimetres) between opposite faces of a material where the valuesare obtained by the measure of resistance to electrical current between electrodes placed in contact with the opposing surfaces ofthe sample (see Ter

18、minology F335).4. Test Specimens4.1 The number of test specimens shall be in accordance with the requirements of the individual test methods.5. Conditioning5.1 Condition the tape for 4 h and conduct tests at the standard laboratory temperature of 23 6 2C 73.4(73.4 6 3.6F,3.6F),unless otherwise speci

19、fied in the test methods or required in a specification. Since the tape or film does not absorb water, themaintenance of constant humidity during testing is not important.6. Width6.1 Determine width measurements using a steel scale having divisions at a minimum of 0.5-mm (164-in.-in.) intervals.6.2

20、Test at least one specimen from each lot.6.3 Each test specimen shall be approximately 450 mm 18 in.(18 in.) in length. Place the specimens on 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 Repor

21、t the average width in millimetres or inches(or inches) plus the maximum and minimum values if they are requiredby a specification.7. Thickness7.1 Measure thickness of the tape and film in accordance with Test Methods D374D374/D374M. Test Method D shall be thepreferred method. The force on the foot

22、shall not exceed 300 g. Test Method B shall not be used as the film is compressible, andthere is no restraint on how much compression is used.NOTE 2Alternate methods and equipment are permitted based on documented agreement between producer and buyer.7.2 Report:7.2.1 Report the average thickness to

23、the nearest 0.0025 mm 0.0001 in.(0.0001 in.) plus the maximum and minimum, ifspecified.7.2.2 Report the test method from Test Methods D374D374/D374M if other than Test Method D is used.8. Tensile Properties8.1 Determine tensile strength and elongation in accordance with Test Methods D882. Calculate

24、tensile strength and percentageelongation from the values at the maximum load.NOTE 3Unsintered PTFE does not exhibit a clean break as is normal for most thin plastic sheeting.NOTE 4In some industries elongation at material rupture is important to process control. In such cases it is permissible to i

25、nclude this informationas 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 minimum and maximum values in megapascals (MPa) (pound-force per squareinch (psi).8.3.2 Report the average percent

26、age elongation at maximum load and the minimum and maximum values.9. Specific Gravity (Relative Density)9.1 Determine specific gravity in accordance with Test Method A of Test Methods D792. Other equipment shown to givecomparable results may be used.NOTE 5Test Methods D792 can generally be used as P

27、TFE film or tape typically exhibits hydrophobic characteristics.D6040 182NOTE 6Especially useful for this test, has been the electronic densimeter, Model ED-120 T.5NOTE 7Avolume method (apparent density) may be used providing that the testing error is held to less than one third of the total allowab

28、le variance.Calculate the density as follows:D 5Wg /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. Residual Extrusion Aids or Other Volatile Components10.1 Determine the percentage of volatile m

29、aterial using a minimum 35-gram sample and test temperature 218 6 5C (425 610F), and test for 1.5 hours. Allow sample to cool for a minimum of 30 minutes in an environment that prevents condensation.Calculate the loss using the pre and post-heated sample weights and a 0.0001 gram analytical balance.

30、NOTE 8Commercially available equipment designed to perform volatile 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 determination of relative permittivity of electrical insulating materials and should be p

31、erformedin accordance with Test Methods D150 using a microelectrode system at a frequency of 1 MHz.NOTE 9The results are offered as proof of consistency of lot to lot of material that usually is to be processed further. The processing may result insignificant change in the dielectric constant. The t

32、est results, therefore, are used primarily to ensure product uniformity of the film or tape as received.11.2 Test one specimen per lot.12. Volume Resistivity12.1 Perform the test in accordance with Test Methods D257.NOTE 10The results are offered as proof of consistency of lot to lot of material tha

33、t usually is to be processed further. The processing may result insignificant change in the dielectric constant. The test results, therefore, are used primarily to ensure product uniformity of the film or tape as received.12.2 Randomly select Test one specimen per lot and test.lot.13. Dielectric Bre

34、akdown Voltage13.1 Determine the dielectric breakdown voltage in accordance with Test Method A, Short Time Test of Test Methods D149.13.2 Randomly select five specimens per lot and test.13.3 The voltage rate of rise shall be 500 V/s.13.4 Perform the test in air at standard laboratory conditions unle

35、ss otherwise specified.13.5 Use Type 3 electrodes as described in Table 1 of Test Method D149 shall be used.13.6 Give special attention to the hazards listed in Test Methods D149.NOTE 11Dielectric breakdown voltage may not be applicable to some tapes due to width constraints.14. Unit Weight14.1 Dete

36、rmine unit weight in accordance with Test Methods D3776D3776/D3776M.14.2 Randomly select Test one specimen per lot and test.lot.15. Keywords15.1 dielectric breakdown voltage; dielectric constant; elongation; lubricated PTFE; paste extruded PTFE; PTFE; specificgravity; tensile properties; unsintered

37、PTFE; virgin; volatiles; volume resistivity5 The sole source of supply of the apparatus known to the committee at this time is Testing Machines, Inc., 400 Bayview Avenue, Amityville, NY 11701. If you are awareof alternative suppliers, please provide this information toASTM International Headquarters

38、.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,1 which you may attend.D6040 183SUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue, D6040 - 06,that may impact the use of this stand

39、ard. (August(December 1, 2012)2018)(1) Removed reference to withdrawn standard D2288 from 2.1.(1) RevisedAmended wording in 10.112.2 and added14.2Note 8.(2) AddedRemoved Note 2, andvolume resistivity re-numbered subsequent notes.from Terminology section.(4) Corrected spelling of hydrophobic in revis

40、ed Note 5.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 expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such r

41、ights, 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 comments are invited either for revision of this standard or for additiona

42、l 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 AST

43、M 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 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 184