1、Designation: D7471 09 (Reapproved 2014)Standard Specification forCPT-Fluoropolymer Molding and Extrusion Materials1This standard is issued under the fixed designation D7471; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、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 covers copolymers ofchlorotrifluoroethylene, perfluoroalkoxy, and tetrafluoroethyl-ene and are s
3、uitable for extrusion, compression, and injectionmolding.1.2 This specification does not cover blended materials anddoes not cover recycled materials.1.3 The values stated in SI units as detailed in IEEE/ASTMSI-10 are to be regarded as the standard. The values given inparentheses are for information
4、 only.1.4 The following safety hazards caveat pertains only to thetest method portion, Section 11, of this specification.Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate
5、safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE 1There is no known ISO equivalent to this standard.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of Plastics
6、D792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1238 Test Method for Melt Flow Rates of Thermoplasticsby Extrusion PlastometerD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3418 Test Method for Tran
7、sition Temperatures and En-thalpies of Fusion and Crystallization of Polymers byDifferential Scanning CalorimetryD3892 Practice for Packaging/Packing of PlasticsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsIEEE/ASTM SI-10 Use of the International System of Units(SI): The
8、Modem Metric System3. Terminology3.1 GeneralThe terminology given in Terminology D883is applicable to this specification.3.2 Definitions:3.3 lot, none production run or a uniform blend of two ormore production runs.3.4 GeneralThe abbreviated terms given in TerminologyD1600 are applicable to this spe
9、cification.4. Classification4.1 This specification covers one type of fluoropolymersupplied in pellet form classified according to their meltingpoint. The resins of each type are divided into four gradesaccording to their melt flow rate.4.2 An one-line system shall be used to specify materialscovere
10、d by this specification. The system uses predefined cellsto refer to specific aspects of this specification, as illustrated asfollows:Specification _Standard Number : Type : Grade : SpecialBlock : : : Notes: :,:Example: Specification D7471 - 09, I2For this example, the line callout shall be, Specifi
11、cationD7471 09, I2 and shall specify a fluoropolymer that has all ofthe properties listed for that type and grade in the appropriatespecified properties, or tables, or both, in the specificationidentified. A comma is used as the separator between thestandard number and the type. Separators are not n
12、eededbetween the group and grade.35. General Requirements5.1 The material shall be of uniform composition and soprepared as to conform to the requirements of this specifica-tion.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcomm
13、ittee D20.15 on ThermoplasticMaterials.Current edition approved March 1, 2014. Published March 2014. Originallyapproved in 2009. Last previous edition approved in 2009 as D7471 09. DOI:10.1520/D7471-09R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer S
14、ervice at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3See the ASTM Form and Style Manual, available from ASTM Headquarters.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, P
15、A 19428-2959. United States15.2 The material described in this specification shall be freeof foreign matter to such a contamination level as shall beagreed upon between the purchaser and the seller.6. Performance Requirements6.1 The average test result of the lot shall conform to therequirements pre
16、scribed in Table 1 when tested by the proce-dures specified herein. Table 1 lists those tests of specificgravity and tensile properties requiring a specimen molded asdescribed in Section 8.7. Sampling7.1 The materials shall be sampled in accordance with anadequate statistical sampling program.8. Spe
17、cimen Preparation8.1 Prepare a molded sheet 1.5 6 0.3 mm (0.06 6 0.01 in.)thick. Use a picture-frame-type chase having a suitableblanked-out section and thickness to produce the desired sheet.Use clean aluminum foil, 0.13 to 0.18 mm (0.005 to 0.007 in.)thick, in contact with the resin. Spraying a hi
18、gh-temperaturemold release agent on the aluminum foil will help prevent thefoil from sticking to the sheet. Use steel molding plates at least1.0 mm (0.040 in.) thick and have an area adequate to cover thechase.8.2 Lay down and smoothly cover one plate with a sheet ofaluminum foil. Place the mold cha
19、se on top of this assembly.Place within the mold chase sufficient molding material toproduce the required sheet in such manner that the polymercharge is a mound in the middle of the chase. Place a secondsheet of aluminum foil on top of the granules and add the topmold plate. Place the assembly in a
20、compression molding presshaving platens that have been heated to 320 6 5C (608 69F).8.3 Bring the press platens to incipient contact with themold assembly. Hold for 2 to 4 min without pressure. Applyapproximately 1 MPa (145 psi) and hold for 1 to 1.5 min. Thenapply 2 to 4 MPa (290 to 580 psi) and ho
21、ld for 1 to 1.5 min.Maintain the press at 320 6 5C (608 6 9F) during thesesteps. Remove the assembly from the press and place betweentwo 20 6 7-mm (0.75 6 0.25-in.) steel plates whose tempera-ture is less than 40C (104F).8.4 When the sheet is cool enough to touch about 50 to 60C(122 to 140F), remove
22、 aluminum foil from the sheet. (If thesheet is allowed to cool to room temperature, the aluminum foilcannot be pulled free.)9. Conditioning9.1 For tests of specific gravity and tensile properties,condition the molded test specimens in accordance withProcedure A of Practice D618 for a period of at le
23、ast 4 h priorto test. The other tests require no conditioning.9.2 Conduct tests at the standard laboratory temperature of23 6 2C (73.4 6 3.6F) for determination of specific gravityand tensile properties only. Since this resin does not absorbwater, the maintenance of constant humidity during testing
24、isnot necessary. Conduct tests for melt flow rate and meltingpoint under ordinary laboratory conditions.10. Packaging and Package Marking10.1 PackagingThe material shall be packaged in stan-dard commercial containers so constructed as to ensure accep-tance by common or other carriers for safe transp
25、ortation to thepoint of delivery unless otherwise specified in the contract ororder.10.2 MarkingShipping containers shall be marked withthe name of the material, type, grade, and quantity therein.10.3 All packing, packaging, and marking provisions ofPractice D3892 shall apply to this specification.1
26、1. Test Methods11.1 Melt Flow Rate:11.1.1 Principle of Test MethodThe melt flow rate shall bedetermined at 297 6 1C using Procedure A or B described inTest Method D1238. The extrusion plastometer to be used isdescribed in Test Method D1238 modified by use of corrosionresistant alloy for the barrel l
27、ining, orifice, piston tip, andorifice securing device. Use pellets or pieces of approximatelythe same size cut from molded or extruded forms. Strips about6mm(14 in.) by 76 mm (3 in.) long also load readily into thebarrel. Refer to Table 2 or Table 3 of Test Method D1238 forthe amount of charge whic
28、h shall be adjusted accordingly withmelt density of CPT being used. Usually the charge amount is5 to 15 g. Flow rate shall be measured using a load of 10,000g for Type I Grades 1 and 2, and 5000 g for Type I Grades 3and 4. Collect five successive cuts for the manual method.11.1.2 Precision and BiasP
29、recision and bias for this testmethod are to be determined by round-robin testing.11.2 Specific GravityDetermine the specific gravity of aspecimen approximately 25 by 38 mm (1 by 1.5 in.) blanked orcut from the molded plaque (see Section 8) in accordance withthe procedures described in Test Methods
30、D792.Add two dropsof a wetting agent to the water in order to reduce the surfacetension and ensure complete wetting of the specimen.TABLE 1 Detail RequirementsType IGrade 1 2 3 4Specificgravity,min: 2.12 2.12 2.12 2.12max: 2.17 2.17 2.17 2.17Melting point,C,min: 235 235 235 235max: 255 255 255 255Fl
31、ow rate,g/10 min,min: 1A4A7B20Bmax: 4A15A20B40BTensilestrength,min,:MPa 25 22.75 20.68 20.68psi 3625 3300 3000 3000Elongation,min, %:300 275 260 250AMeasured with 10,000 g load.BMeasured with 5000 g loadD7471 09 (2014)211.3 Melting Point:11.3.1 Melting Characteristics by Thermal AnalysisUsedifferent
32、ial scanning calorimetry (DSC) as described in TestMethod D3418 for this determination. For specificationpurposes, the test shall be run on a 10 6 2-mg specimen cutfrom a pellet of the resin as sold or received. The heating rateshall be run at 10 6 1C (18 6 1.8F)/min to 330C (626F).Two peaks during
33、the initial melting test are observed occa-sionally. In this case, the peak temperatures shall be reported asTlfor the lower temperature and Tufor the upper temperature.The peak temperature of the peak largest in height shall bereported as the melting point if a single value is required. If apeak te
34、mperature is difficult to discern from the curves, that is,if the peak is rounded rather than pointed, straight lines shall bedrawn tangent to the sides of the peak. The temperaturecorresponding to the point where these lines intersect beyondthe peak shall be taken as the peak temperature.11.4 Tensi
35、le Properties:11.4.1 Cut five specimens with the microtensile die shownin Fig. 1 of Test Method D1708. The die shall be of thesteel-rule or solid metal type of curvature of 5 6 0.5-mm (0.26 0.02-in.) type. Determine the tensile properties in accor-dance with the procedures described in Test Method D
36、638except that the specimens used shall be as detailed above, theinitial jaw separation shall be 22.2 6 0.13 mm (0.875 6 0.005in.), and the speed of testing shall be 50 6 5 mm/min (2 6 0.2in./min). Clamp the specimens with essentially equal lengths ineach jaw. Determine the elongation from the chart
37、, expressingit as a percentage of the initial jaw separation.12. Number of Tests12.1 One set of test specimens as prescribed in Section 11shall be considered sufficient for testing each sample. Theaverage result of the samples tested shall conform to therequirements of this specification.13. Certifi
38、cation and Inspection13.1 Inspection and certification of the material suppliedwith reference to this specification shall be for conformance tothe requirements specified herein.13.2 Lot-acceptance inspection shall be the basis on whichacceptance or rejection of the lot is made. The lot-acceptanceins
39、pection shall consist of melt flow rate and melting point.13.3 Periodic-check inspection with reference to a specifi-cation shall consist of the tests for all requirements of thematerial under the specification. Inspection frequency shall beadequate to ensure the material is certifiable in accordanc
40、e with13.4.13.4 Certification shall be that the material was manufac-tured by a process in statistical control, sampled, tested and thatthe average values for the lot meet the requirements of thespecification.13.5 ReportsWhen specified in the purchase order orcontract, a report of the test results s
41、hall be furnished. Thereport shall consist of results of the lot-acceptance inspectionfor the shipment.14. Keywords14.1 chlorotrifluoroethylene copolymer; copolymer ofchlorotrifluoroethylene, perfluoroalkoxy, and tetrafluoroethyl-ene; CPT copolymer; CTFE copolymer; ethylene copolymer;perfluoroaloxy
42、copolymer; PFAcopolymer; tetrafluoroethylenecopolymer; TFE copolymerASTM 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
43、 such patent rights, and the riskof infringement of such rights, 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 in
44、vited either for revision of this standard or for additional 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 receive
45、d a fair hearing you shouldmake your views known to the ASTM 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 t
46、his 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/).D7471 09 (2014)3
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