1、Designation: D 6457 08Standard Specification forExtruded and Compression Molded Rod and Heavy-WalledTubing Made from Polytetrafluoroethylene (PTFE)1This standard is issued under the fixed designation D 6457; the number immediately following the designation indicates the year oforiginal adoption or,
2、in the case of 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 specification is intended to be a means of callingout plastic product used
3、in the fabrication of end items or parts.1.2 This specification covers requirements and test methodsfor the material, dimensions, and workmanship, and the prop-erties of extruded- and compression-molded rod, and heavy-walled tube manufactured from granular unfilled PTFE resin inaccordance with Speci
4、fication D 4894.1.3 This specification covers rod and heavy-walled tubingmade wholly from polytetrafluoroethylene and produced inaccordance with good commercial practice.1.4 The properties included in this specification are thoserequired for the compositions covered. Requirements neces-sary to ident
5、ify particular characteristics important to special-ized applications are described by using the classificationsystem given in Section 4.1.5 This specification allows for the use of recycled plasticsas defined in Guide D 7209.1.6 The values stated in inch-pound units are to be regardedas the standar
6、d in all property and dimensional tables.1.7 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 appro-priate safety and health practices and determine the applica-bility of regulatory
7、 limitations prior to use.NOTE 1Although this specification and ISO 13000-1 and ISO13000-2 differ in approach or detail, data obtained using either aretechnically equivalent.2. Referenced Documents2.1 ASTM Standards:2D 374 Test Methods for Thickness of Solid Electrical Insu-lationD 638 Test Method f
8、or Tensile Properties of PlasticsD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 883 Terminology Relating to PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 1708 Test Method for Tensile Properties of Plastics byUse of Microte
9、nsile SpecimensD 3892 Practice for Packaging/Packing of PlasticsD 4000 Classification System for Specifying Plastic Mate-rialsD 4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning CalorimetryD 4894 Specification for Polytetrafluoroethylene
10、(PTFE)Granular Molding and Ram Extrusion MaterialsD 7209 Guide for Waste Reduction, Resource Recovery,and Use of Recycled Polymeric Materials and ProductsE94 Guide for Radiographic ExaminationIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System2.2 ISO S
11、tandard:3ISO 13000-1 PlasticsPolytetrafluoroethylene (PTFE)Semi-Finished ProductsPart I: Requirements and Des-ignationISO 13000-2 PlasticsPolytetrafluoroethylene (PTFE)Semi-Finished ProductsPart II: Preparation of TestSpecimens and Determination of Properties3. Terminology3.1 DefinitionsTerms are de
12、fined in accordance with Ter-minology D 883 unless otherwise specified.3.1.1 heavy-walled tubing, nan annular shape with aminimum wall thickness of116 in.3.1.2 lot, none production run or a uniform blend of twoor more production runs.3.1.3 rod, na solid cylindrical shape.3.2 AbbreviationsAbbreviatio
13、ns are in accordance withTerminology D 1600 unless otherwise indicated.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials (D20.15.12 on Fluoropolymers).Current edition approved Nov. 1, 2008.
14、 Published November 2008. Originallyapproved in 1999. Last previous edition approved in 2004 as D 6457 - 04.2For 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 stan
15、dards 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box
16、 C700, West Conshohocken, PA 19428-2959, United States.3.2.1 PTFEpolytetrafluoroethylene4. Classification4.1 Product shape and size is defined in the applicablepurchase order.4.2 This specification covers product-extruded andcompression-molded as listed in Tables 1 and 2.4.2.1 The type of PTFE shape
17、 product is categorized bytype, class, and grade as defined in Tables 1 and 2.4.2.2 Each type of PTFE shape is categorized into one of thefollowing grades:4.2.2.1 Grade 1Virgin-extruded or compression-moldedproduct made using only 100 % virgin PTFE resin.4.2.2.2 Grade 2Recycled-extruded or compressi
18、on-molded product made using any amount up to 100 % recycledPTFE plastic.4.2.3 Products can be further differentiated by propertyrequirements, as defined for three classes of PTFE products inTables 1 and 2.4.2.3.1 Class 1A type of rod or heavy-walled tubinghaving maximum physical and electrical prop
19、erties to meetrigid requirements.4.2.3.2 Class 2 (General Purpose)A type of rod orheavy-walled tubing having properties required of generalelectrical, mechanical, and chemical applications.4.2.3.3 Class 3A type of rod or heavy-walled tubing fornoncritical chemical, electrical, and mechanical applica
20、tions.4.3 The type, class, and grade is further differentiated basedon dimensional stability (elevated temperature excursion test)and internal defect requirements.4.4 Classification D 4000 also is used to describe extrudedor compression molded products not included in Tables 1 and2 by means of a cel
21、l callout that includes the applicable tableof suffixes using type and specific properties.4.5 To facilitate the incorporation of future or specialmaterials not covered by Tables 1 and 2, the “as specified”category (00) for type, class, and grade is shown in the tablewith the basic properties to be
22、obtained from ClassificationD 4000 as they apply.4.6 Callout DesignationA line callout system is used tospecify materials in this specification. The system uses pre-defined cells to refer to specific aspects of this specificationillustrated as follows:4.6.1 Examples:4.6.1.1 Example 1Product made fro
23、m unfilled PTFE,virgin, premium (no dimensional stability requirements orinternal examination).Cell Callout: 10111AC01 = product made from PTFE in accordance with Table 1.1 = unfilled PTFE type.1 = gradevirgin.1 = premium class product.A = no dimensional stability required.C = no internal exam requi
24、red.TABLE 1 Mechanical and Electrical Requirements of PTFE RodType Description Grade Description Class DescriptionSize Rangein.ASpecificGravity(min)BUltimateTensileStrength,psi (min)CTensileElongation,% (min)DDielectricStrength,volts/mil(min)DDimensionalStabilityEInternalExaminationF01 Unfilled PTFE
25、 1 virgin 1 premium less than12 2.14 2000 150 700 A or B C or D12 to 112 2.15 2100 175 750 A or B C or Dover 112 2.15 2200 200 800 A C or D2 general purpose less than12 2.12 1700 100 600 A or B C or D12 to 112 2.13 1800 125 650 A or B C or Dless than12 2.14 1900 150 700 A C or D3 noncritical less th
26、an12 2.12 1400 50 250 A or B C or D12 to 112 2.13 1500 75 250 A or B C or Dover 112 2.14 1600 75 250 A C or D0 as specified - - - - - A or B C or D01 Unfilled PTFE 2 recycled 1 premium less than12 TBD TBD TBD TBD A or B C or D12 to 112 TBD TBD TBD TBD A or B C or Dover 112 TBD TBD TBD TBD A C or D2
27、general purpose less than12 TBD TBD TBD TBD A or B C or D12 to 112 TBD TBD TBD TBD A or B C or Dless than12 TBD TBD TBD TBD A C or D3 noncritical less than12 TBD TBD TBD TBD A or B C or D12 to 112 TBD TBD TBD TBD A or B C or Dover 112 2.14 1600 75 250 A D0 other none - - - - A or B C or D00 Other PT
28、FE 1 virgin 0 as specified none - - - - A or B C or D2 recycled 0 as specified none - - - - A or B C or D0 as specified 0 as specified none - - - - A or B C or DAOne inch equals 25.4 mm.BSee 12.2.CSee 12.3.DSee 12.4.ESee 12.5. “A” indicates that the product has no dimensional stability requirements.
29、 “B” indicates that product must comply with dimensional stability requirements in7.3. This requirement applies only to rod that is under 25.4 mm 1 in. in diameter.FSee 12.6. “C” indicates that the product has no internal inspection requirements. “D” indicates that product must comply with the inspe
30、ction requirements given in 8.3.D64570824.6.1.2 Example 2Products made from unfilled PTFE,virgin, general purpose properties, 1 in. diameter rod, maxi-mum tolerance of +0.020 in. inspected for internal defect.Cell Callout: 10112BD1 = product made from PTFE in accordance with Table 1.01 = unfilled ty
31、pe.1 = virgin grade product.2 = general purpose class requirements.B = dimensional tolerances in accordance with Table 3.D = internal inspection required.4.6.2 These two examples illustrate how a one-line, alpha-numeric sequence identifies the product composition, commer-cial parameters and physical
32、 characteristics of extruded orcompression molded product. A space must be used as aseparator between the specification number and the typedesignation. No separators are needed between type, class, andgrade. When special notes are to be included, such informationshould be preceded by a comma. Specia
33、l tolerances must benoted at the time of order and are inserted after the grade inparenthesis and preceded by a comma.5. Ordering Information5.1 All shapes covered by this specification shall be orderedusing the proper callout designation (see 4.6).6. Physical Property Requirements6.1 The physical p
34、roperty values listed within this specifi-cations tables are to be considered minimum specificationvalues. Any requirement for specific test data for a givenproduction lot must be specified at the time of order. Physicalproperties for products not yet included in Table 1 are specifiedusing Classific
35、ation D 4000 for extruded or compression-molded products.6.2 Melting PointThe melting point of all types of rod andheavy-walled tubing shall be 327 6 10C when tested inaccordance with 12.7.7. Dimensions, Mass, and Permissible Variations7.1 The dimensions and tolerances of heavy-walled tubingshall be
36、 in accordance with Table 3. Measurements shall bemade in accordance with Method A of Test Methods D 374.7.2 For rod and heavy-walled tubing, center-less-grind theoutside diameter to meet the tolerance given in Table 3.7.2.1 EccentricityThe eccentricity of the heavy-walledtubing, when measured as on
37、e-half of the difference betweenthe maximum and minimum wall thickness at either end of thetube, shall not exceed 10 % of the nominal wall thickness. Thenominal wall thickness is one-half the difference between thenominal outside diameter and the nominal inside diameter.7.3 As indicated in Table 1,
38、when tested in accordance with12.5, products must have maximum change in a samplediameter of 0.5 % or a maximum change in a sample diameterof 3.0 %, or both.7.4 Products shall be produced within commercial toler-ances and with the lowest stress levels for machined parts asdelineated in Table 3.7.5 T
39、ubular bar dimensions shall be supplied in the unfin-ished condition, unless otherwise specified at time of order,sufficient to finish to the nominal dimension ordered.TABLE 2 Mechanical and Electrical Requirements of PTFE Heavy-Walled TubingType Description Grade Description Class DescriptionSpecif
40、icGravity(min)AUltimateTensileStrength, psi(min)BTensileElongation,% (min)BDielectricStrength,volts/mil(min)CDimensionalStabilityDInternalExaminationE01 Unfilled PTFE 1 virgin 1 premium 2.15 2000 150 750 A or B C or D2 general purpose 2.15 1800 130 650 A or B C or D3 noncritical 2.14 1600 100 325 A
41、or B C or D0 as specified -2 recycled 1 premium 2.14 1500 140 700 A or B C or D2 general purpose 2.14 1400 120 600 A or B C or D3 noncritical 2.13 1300 80 250 A or B C or D0 as specified -0 as specified 0 as specified AorBCorD00 As specified 1 virgin 0 as specified -2 recycled 0 as specified AorBCor
42、D0 as specified 0 as specified -ASee 12.2.BSee 12.3.CSee 12.4.DSee 12.5. “A” indicates that the product has no dimensional stability requirements. “B” indicates that product must comply with dimensional stability requirements in7.3.ESee 12.6.“ C” indicates that the product has no internal inspection
43、 requirements.“ D” indicates that product must comply with the inspection requirements given in 8.3.TABLE 3 Diameter and Tolerance for PTFE Rod and Heavy-Walled TubingNominal Diameter orOutside Diameter, in.A,BTolerance, in.A,C116 0.00518 0.007316 0.00914 0.01238 0.01212 0.01458 0.01634 0.0171 0.020
44、114 0.025112 0.030134 0.0352 0.035214 0.040212 0.0453 0.045AOne inch equals 25.4 mm.BIntermediate diameters shall conform to the tolerance of the next largerdiameter in this table.CThe tolerance is plus for outside diameters and minus for inside diameters.D64570838. Workmanship, Finish and Appearanc
45、e8.1 ColorClass 1 shall be white to translucent withoccasional spots. Class 2 typically are white to light gray orlight brown. For Class 3, occasional small gray, brown, orblack spots shall not be considered cause for rejection.8.2 FinishThe rod or heavy-walled tubing shall be freefrom surface blist
46、ers, cracks, wrinkles, and other surfacedefects that might impair it for general use.8.3 Internal DefectsClasses C and D either shall be freeof all macroscopic voids, cracks, and foreign inclusions, or thelocation of such defects shall be marked or identified clearly.The examination for internal def
47、ects shall be made in accor-dance with Guide E94.9. Sampling9.1 Sampling shall be statistically adequate to satisfy therequirements of this specification.10. Number of Tests10.1 Routine lot inspection shall consist of all the criteriaspecified in the applicable product tables.10.2 The criteria liste
48、d in these product tables and defini-tions are sufficient to establish conformity of the sheet, plate,rod, or tubular bars to this specification. When the number oftest specimens is not stated in the test method, make a singledetermination. If more than single determinations and separateportions of
49、the same sample are made, the results shall beaveraged. The final result shall conform to the requirementsprescribed in this specification.11. Test Conditions11.1 Conditioning of SpecimensThe specification valuesand dimensions are based on conditioning techniques outlinedin Procedure A of Practice D 618.11.2 Standard TemperatureThe tests shall be conducted atthe standard laboratory temperature of 23 6 1C 73.4 61.8F. Since the rod or heavy-walled tubing does not absorbwater, the maintenance of const
