1、Designation: D 6457 04Standard 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 (e) 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 Spec
4、ification 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 iden
5、tify 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 5033.1.6 The values stated in inch-pound units are to be regardedas the standa
6、rd 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 regulator
7、y 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
8、for Tensile Properties of PlasticsD 790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating MaterialsD 792 Test Methods for Density Specific Gravity (RelativeDensity) of Plastics by DisplacementD 883 Terminology Relating to PlasticsD 1600 Terminology
9、 for Abbreviated Terms Relating toPlasticsD 1708 Test Method for Tensile Properties of Plastics byUse of Microtensile SpecimensD 1710 Specification for Polytetrafluoroethylene (PTFE)Basic Shapes, Rod, and Heavy-Walled TubingD 3892 Practice for Packaging/Packing of PlasticsD 4000 Classification Syste
10、m for Specifying Plastic Mate-rialsD 4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning CalorimetryD 4894 Specification for Polytetrafluoroethylene (PTFE)Granular Molding and Ram Extrusion MaterialsD 5033 Guide for the Development of Stand
11、ards Relating tothe Proper Use of Recycled PlasticsE94 Guide for Radiographic TestingIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System2.2 ISO Standard:3ISO 13000-1 PlasticsPolytetrafluoroethylene (PTFE)Semi-Finished ProductsPart I: Requirements and D
12、es-ignationISO 13000-2 PlasticsPolytetrafluoroethylene (PTFE)Semi-Finished ProductsPart II: Preparation of TestSpecimens and Determination of Properties3. Terminology3.1 DefinitionsTerms are defined in accordance with Ter-minology D 883 unless otherwise specified.3.1.1 heavy-walled tubing, nan annul
13、ar 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.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15
14、on ThermoplasticMaterials (D20.15.12 on Fluoropolymers).Current edition approved December 1, 2004. Published December 2004. Origi-nally approved in 1999. Last previous edition approved in 1999 as D 6457 - 99e1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custo
15、mer 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 10036.1*A Summary of Changes section appears at th
16、e end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2 AbbreviationsAbbreviations are in accordance withTerminology D 1600 unless otherwise indicated.3.2.1 PTFEpolytetrafluoroethylene4. Classification4.1 Product sh
17、ape 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 product is categorized bytype, class, and grade as defined in Tables 1 and 2.4.2.2 Each type of PTFE shape is categori
18、zed 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 compression-molded product made using any amount up to 100 % recycledPTFE plastic.4.2.3 Products can be further differentiated b
19、y 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 properties to meetrigid requirements.4.2.3.2 Class 2 (General Purpose)A type of rod orheavy-walled tubing having properties
20、 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 applications.4.3 The type, class, and grade is further differentiated basedon dimensional stability (elevated temperature excu
21、rsion 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 cell callout that includes the applicable tableof suffixes using type and specific properties.4.5 To facilitate the incorp
22、oration 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 obtained from ClassificationD 4000 as they apply.4.6 Callout DesignationA line callout system is used tospecify materia
23、ls 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 from unfilled PTFE,virgin, premium (no dimensional stability requirements orinternal examination).Cell Callout: 10111AC01
24、= 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 required.4.6.1.2 Example 2Products made from unfilled PTFE,virgin, general purpose properties, 1 in. diameter rod, maxi-mum
25、tolerance of +0.020 in. inspected for internal defect.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)DDimensi
26、onalStabilityEInternalExaminationF01 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 125 650 A or B C or Dless than
27、12 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 or D12 to 112 TBD TBD TBD TB
28、D 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 or Dover 112 2.14 1600 75 25
29、0 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 12.5. “A” indicates that the
30、product has no dimensional stability requirements. “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”
31、 indicates that product must comply with the inspection requirements given in 8.3.D6457042Cell 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
32、3.D = internal inspection required.4.6.2 These two examples illustrate how a one-line, alpha-numeric sequence can identify the product composition, com-mercial parameters and physical characteristics of extruded orcompression molded product. A space must be used as aseparator between the specificati
33、on 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. Special tolerances must benoted at the time of order and are inserted after the grade inparenthesis and preceded by a comma
34、.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 property values listed within this specifi-cations tables are to be considered minimum specificationvalues. Any requir
35、ement 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 Classification D 4000 for extruded or compression-molded products.6.2 Melting PointThe melting point of all types of rod andhe
36、avy-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 in accordance with Table 3. Measurements shall bemade in accordance with Method A of Test Methods D 374.7.2 For rod
37、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 one-half of the difference betweenthe maximum and minimum wall thickness at either end of thetube, shall not exceed 10
38、% 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, when tested in accordance with12.5, products must have maximum change in a samplediameter of 0.5 % or a maximum chang
39、e in a sample diameterof 3.0 %, or both.TABLE 2 Mechanical and Electrical Requirements of PTFE Heavy-Walled TubingType Description Grade Description Class DescriptionSpecificGravity(min)AUltimateTensileStrength, psi(min)BTensileElongation,% (min)BDielectricStrength,volts/mil(min)CDimensionalStabilit
40、yDInternalExaminationE01 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 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 D
41、3 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 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 stabi
42、lity 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 requirements.“ D” indicates that product must comply with the inspection requirements given in 8.3.TABLE 3 Diameter and Toleran
43、ce 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 0.020114 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
44、 tolerance of the next largerdiameter in this table.CThe tolerance is plus for outside diameters and minus for inside diameters.TABLE 4 Precision Summary, Tensile Strength and Elongation atBreakNOTE 1Ir= 2.8 3 CVr; IR= 2.8 3 CVRMaterialTensile StrengthMean, psi CVr,% CVR,% Ir,% IR,%Granular PTFE 480
45、1 2.79 8.85 7.81 24.78Coagulated Dispersion PTFE 4807 2.71 3.37 7.59 9.46PFA 4164 3.11 9.03 8.71 25.28FEP 4144 2.98 7.98 3.34 22.34D64570437.4 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 dimensi
46、ons shall be supplied in the unfin-ished condition, 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 or
47、light 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 blisters, cracks, wrinkles, and other surfacedefects that might impair it for general use.8.3 Internal DefectsClasses C
48、 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 defects shall be made in accor-dance with Guide E94.9. Sampling9.1 Sampling shall be statistically adequate to satisf
49、y 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 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 number 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
