1、Designation: D6457 08 (Reapproved 2013)Standard Specification forExtruded and Compression Molded Rod and Heavy-WalledTubing Made from Polytetrafluoroethylene (PTFE)1This standard is issued under the fixed designation D6457; the number immediately following the designation indicates the year oforigin
2、al adoption or, 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. Scope1.1 This specification is intended to be a means of callingout plasti
3、c product used 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 inaccord
4、ance with Specification D4894.1.3 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
5、-sary to identify 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 D7209.1.6 The values stated in inch-pound units are to be regardeda
6、s the standard 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
7、of regulatory 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:2D374 Test Methods for Thickness of Solid Electrical Insu-lation (Withd
8、rawn 2013)3D638 Test Method for Tensile Properties of PlasticsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD1708 Test Method for Tensile Properties of
9、 Plastics by Useof Microtensile SpecimensD3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic Materi-alsD4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning CalorimetryD4894 Specification for Po
10、lytetrafluoroethylene (PTFE)Granular Molding and Ram Extrusion MaterialsD7209 Guide for Waste Reduction, Resource Recovery, andUse of Recycled Polymeric Materials and ProductsE94 Guide for Radiographic ExaminationIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units (SI): The Modern M
11、etric System2.2 ISO Standard:4ISO 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 De
12、finitions:3.1.1 Terms are defined in accordance with TerminologyD883 unless otherwise specified.3.1.2 heavy-walled tubing, nan annular shape with aminimum wall thickness of116 in.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcom
13、mittee D20.15 on ThermoplasticMaterials (D20.15.12 on Fluoropolymers).Current edition approved May 1, 2013. Published May 2013. Originallyapproved in 1999. Last previous edition approved in 2008 as D6457 - 08. DOI:10.1520/D6457-08R13.2For referenced ASTM standards, visit the ASTM website, www.astm.o
14、rg, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards
15、 Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.*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 States13.1.3 lot, none production run or a u
16、niform blend of twoor more production runs.3.1.4 rod, na solid cylindrical shape.3.2 Abbreviations:3.2.1 Abbreviations are in accordance with TerminologyD1600 unless otherwise indicated.3.2.2 PTFEpolytetrafluoroethylene4. Classification4.1 Product shape and size is defined in the applicablepurchase
17、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 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
18、1Virgin-extruded or compression-moldedproduct made using only 100 % virgin PTFE resin.4.2.2.2 Grade 2Recycled-extruded or compression-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 class
19、es of PTFE products inTables 1 and 2.4.2.3.1 Class 1A type of rod or heavy-walled tubinghaving maximum physical and electrical properties to meetrigid requirements.4.2.3.2 Class 2 (General Purpose)A type of rod or heavy-walled tubing having properties required of general electrical,mechanical, and c
20、hemical applications.4.2.3.3 Class 3A type of rod or heavy-walled tubing fornoncritical chemical, electrical, and mechanical applications.4.3 The type, class, and grade is further differentiated basedon dimensional stability (elevated temperature excursion test)and internal defect requirements.4.4 C
21、lassification D4000 also is used to describe extruded orcompression molded products not included in Tables 1 and 2by means of a cell callout that includes the applicable table ofsuffixes using type and specific properties.4.5 To facilitate the incorporation of future or specialmaterials not covered
22、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 obtained from ClassificationD4000 as they apply.4.6 Callout DesignationA line callout system is used tospecify materials in this specification. The system uses pre-defin
23、ed cells to refer to specific aspects of this specificationillustrated as follows:TABLE 1 Mechanical and Electrical Requirements of PTFE RodType Description Grade Description Class DescriptionSize Rangein.ASpecificGravity(min)BUltimateTensileStrength,psi (min)CTensileElongation,% (min)DDielectricStr
24、ength,volts/mil(min)DDimensionalStabilityEInternalExaminationF01 Unfilled PTFE 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 12
25、5 650 A or B C or Dless than12 2.14 1900 150 700 A C or D3 noncritical less than12 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
26、or D12 to 112 TBD TBD TBD TBD A or B C or Dover 112 TBD TBD TBD TBD A C or D2 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
27、or Dover 112 2.14 1600 75 250 A D0 other none - - - - A or B C or D00 Other PTFE 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 1
28、2.5. “A” indicates that the product has no dimensional stability requirements. “B” indicates that product must comply with dimensional stability requirements in 7.3.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
29、inspection requirements. “D” indicates that product must comply with the inspection requirements given in 8.3.D6457 08 (2013)24.6.1 Examples:4.6.1.1 Example 1Product made from unfilled PTFE,virgin, premium (no dimensional stability requirements orinternal examination).Cell Callout: 10111AC01 = produ
30、ct 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 required.4.6.1.2 Example 2Products made from unfilled PTFE,virgin, general purpose properties, 1 in. diameter rod, maxi-mum toleran
31、ce of +0.020 in. inspected for internal defect.Cell Callout: 10112BD1 = product made from PTFE in accordance with Table 1.01 = unfilled type.1 = virgin grade product.2 = general purpose class requirements.B = dimensional tolerances in accordance with Table 3.D = internal inspection required.4.6.2 Th
32、ese two examples illustrate how a one-line, alpha-numeric sequence identifies the product composition, commer-cial parameters and physical characteristics of extruded orcompression molded product. A space must be used as aseparator between the specification number and the typedesignation. No separat
33、ors are needed between type, class, andgrade. When special notes are to be included, such informationshould be preceded by a comma. Special 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 covere
34、d by this specification shall be orderedusing the proper callout designation (see 4.6).6. Physical Property Requirements6.1 The physical property values listed within this specifi-cations tables are to be considered minimum specificationvalues. Any requirement for specific test data for a givenprodu
35、ction lot must be specified at the time of order. Physicalproperties for products not yet included in Table 1 are specifiedusing Classification D4000 for xtruded or compression-moldedproducts.6.2 Melting PointThe melting point of all types of rod andheavy-walled tubing shall be 327 6 10C when tested
36、 inaccordance with 12.7.7. Dimensions, Mass, and Permissible Variations7.1 The dimensions and tolerances of heavy-walled tubingshall be in accordance with Table 3. Measurements shall bemade in accordance with Method A of Test Methods D374.7.2 For rod and heavy-walled tubing, center-less-grind theout
37、side diameter to meet the tolerance given in Table 3.7.2.1 EccentricityThe eccentricity of the heavy-walledtubing, when measured as one-half of the difference betweenthe maximum and minimum wall thickness at either end of thetube, shall not exceed 10 % of the nominal wall thickness. TheTABLE 2 Mecha
38、nical and Electrical Requirements of PTFE Heavy-Walled TubingType Description Grade Description Class DescriptionSpecificGravity(min)AUltimateTensileStrength, psi(min)BTensileElongation,% (min)BDielectricStrength,volts/mil(min)CDimensionalStabilityDInternalExaminationE01 Unfilled PTFE 1 virgin 1 pre
39、mium 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 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 spec
40、ified -0 as specified 0 as specified AorBCorD00 As specified 1 virgin 0 as specified -2 recycled 0 as specified AorBCorD0 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 co
41、mply with dimensional stability requirements in 7.3.ESee 12.6.“ C” indicates that the product has no internal inspection 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 Diame
42、ter orOutside Diameter, in.A,BTolerance, in.A,C116 0.00518 0.007316 0.00914 0.01238 0.01212 0.01458 0.01634 0.0171 0.020114 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 larger diameterin this table.
43、CThe tolerance is plus for outside diameters and minus for inside diameters.D6457 08 (2013)3nominal wall thickness is one-half the difference between thenominal outside diameter and the nominal inside diameter.7.3 As indicated in Table 1, when tested in accordance with12.5, products must have maximu
44、m 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 Tubular bar dimensions shall be supplied in the unfin-ished co
45、ndition, unless otherwise specified at time of order,sufficient to finish to the nominal dimension ordered.8. Workmanship, Finish, and Appearance8.1 ColorClass 1 shall be white to translucent withoccasional spots. Class 2 typically are white to light gray orlight brown. For Class 3, occasional small
46、 gray, brown, orblack spots shall not be considered cause for rejection.8.2 FinishThe rod or heavy-walled tubing shall be freefrom surface blisters, cracks, wrinkles, and other surfacedefects that might impair it for general use.8.3 Internal DefectsClasses C and D either shall be free ofall macrosco
47、pic voids, cracks, and foreign inclusions, or thelocation of such defects shall be marked or identified clearly.The examination for internal defects shall be made in accor-dance with Guide E94.9. Sampling9.1 Sampling shall be statistically adequate to satisfy therequirements of this specification.10
48、. Number of Tests10.1 Routine lot inspection shall consist of all the criteriaspecified in the applicable product tables.10.2 The criteria listed 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 n
49、umber oftest specimens is not stated in the test method, make a singledetermination. If more than single determinations and separateportions of 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 D618.11.2 Standard TemperatureThe tests shall be conducted atthe
