ASTM D1430-2017 Standard Classification System for Polychlorotrifluoroethylene (PCTFE) Plastics《聚三氟氯乙烯(PCTFE)塑料的标准分类系统》.pdf

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1、Designation: D1430 17Standard Classification System forPolychlorotrifluoroethylene (PCTFE) Plastics1This standard is issued under the fixed designation D1430; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio

2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This classification system covers polychlor

3、otrifluoroeth-ylene (PCTFE) plastics that consist of at least 90 % chlorotri-fluoroethylene and are suitable for extrusion and for compres-sion and injection molding. Additional components allow forchemical modifications, such as co-monomers, but notcolorants, fillers, plasticizers, or mechanical bl

4、ends with otherresins. This classification system does not cover recycledPCTFE materials.1.2 The physical and electrical properties of parts molded orextruded from PCTFE molding compounds vary with thecrystalline content obtained during processing and subsequentannealing. Accordingly, the numerical

5、values listed in Table 1apply only to the test specimens molded in accordance withSection 8. These values are not applicable as design criteria tosemi-finished and finished parts prepared and annealed underother conditions.1.3 The values stated in SI units as detailed in IEEE/SI-10are to be regarded

6、 as the standard. The values given inparentheses are for information only.1.4 The following precautionary statement pertains only tothe test methods portion, Section 10, of this classificationsystem: This standard does not purport to address all of thesafety concerns, if any, associated with its use

7、. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1Although this classification system and ISO 12086-1 (1995)and ISO 12086-2 (1995) differ in approach or detail, da

8、ta obtained usingeither are technically equivalent.2. Referenced Documents2.1 ASTM Standards:2D150 Test Methods for AC Loss Characteristics and Permit-tivity (Dielectric Constant) of Solid Electrical InsulationD618 Practice for Conditioning Plastics for TestingD621 Test Methods for Deformation of Pl

9、astics Under Load(Withdrawn 1994)3D792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3418 Test Method for Transition Temperatures and En-thalpies of Fusion

10、 and Crystallization of Polymers byDifferential Scanning CalorimetryD3892 Practice for Packaging/Packing of PlasticsD4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning CalorimetryD4895 Specification for Polytetrafluoroethylene (PTFE)Resin

11、Produced From DispersionD7194 Specification for Aerospace Parts Machined fromPolychlorotrifluoroethylene (PCTFE)D7211 Specification for Parts Machined from Polychlorotri-fluoroethylene (PCTFE) and Intended for General UseIEEE/SI-10 Standard for Use of the International System ofUnits (SI): The Moder

12、n Metric System2.2 ISO Standard:4ISO 12086-1 (1995) PlasticsFluoropolymer Dispersionsand Moulding and Extrusion Materials, Part 11This classification system is under the jurisdiction ofASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials (Se

13、ction D20.15.12).Current edition approved March 1, 2017. Published March 2017. Originallyapproved in 1956. Last previous edition approved in 2016 as D1430 11(2016).DOI: 10.1520/D1430-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceas

14、tm.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 Institute (ANSI), 25 W. 43rd St.,4th Floor, New

15、 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 StatesThis international standard was developed in accordance with internationally recognize

16、d principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1ISO 12086-2 (1995) PlasticsFluoropolymer Dispersionsand Moulding and

17、 Extrusion Materials, Part 23. Terminology3.1 Definitions:3.1.1 Definitions of terms used in this classification systemshall be in accordance with Terminology D883.3.1.2 lot, none production run or uniform blend of two ormore production runs.3.2 Definitions of Terms Specific to This Standard:3.2.1 p

18、reforming, na process to compress the materialunder pressure in a mold to form a preform.3.2.2 zero strength time (ZST ), ntime measured in accor-dance with Section 10 of this classification system to check therelative molecular weight of PCTFE material.3.3 Abbreviations:3.3.1 Abbreviated terms are

19、in accordance with Terminol-ogy D1600.4. Classification4.1 PCTFE materials in powders and pellets are classifiedinto one group. The group is subdivided into classes based onchemical composition. These classes are subdivided intogrades as shown in the Basic Property Table (Table 1).An example of this

20、 classification system is given as follows:Group 01 = PCTFEClass 1 = homopolymerGrade 2 = having properties per Table 1 (Grade 2)4.1.1 To facilitate incorporation of future material the“other” category for group (01), class (0), and grade (0) areshown in Table 1.5. General Requirements5.1 The moldin

21、g or extrusion material shall be of uniformcomposition and so compounded as to conform to the require-ments of this classification system.6. Detail Requirements6.1 Test specimens prepared in accordance with Section 9shall conform to the requirements prescribed for the particulartype and grade in Tab

22、le 1.6.2 For finished PCTFE parts made from resin meetingGroup 01, Class 1, Grade 3 requirements, and intended foraerospace use, detail requirements given in SpecificationD7194 shall be followed.6.3 For finished PCTFE parts made from resin Group 01,Class 1, Grade 0, 1, 2, or 3 requirements, and inte

23、nded forgeneral use, detail requirements given in Specification D7211shall be followed.7. Sampling7.1 Sampling shall be statistically adequate to satisfy therequirements of 11.4.8. Number of Tests8.1 One set of test specimens as prescribed in Section 9shall be considered sufficient for testing each

24、batch. Theaverage result for the specimens tested shall conform to therequirements prescribed in this classification system.9. Specimen Preparation9.1 Test specimens shall be cut from compression-moldedsheets 1.58 6 0.08 mm (0.062 6 0.003 in.) thick, preparedfrom the resins in the following manner:T

25、ABLE 1 Requirements for PCTFE Molded Test SpecimensPropertiesGroup Class Description GradeSpecificGravity,A23/23CZeroStrengthTime, sBDeformationUnderLoadC,DMeltingPoint,CEDielectric ConstantF, max Dissipation FactorG, maxKhz MHz KHz MHz01 1 homopolymer 1 2.10-2.15 100-199 10 210-220 2.70 2.50 0.030

26、0.0122 2.10-2.15 200-299 10 210-220 2.70 2.50 0.030 0.0123 2.10-2.15 300-450 10 210-220 2.70 2.50 0.030 0.01202 modifiedhomopolymer 1 2.10-2.12 100-199 15 200-210 2.70 2.50 0.030 0.0122 2.10-2.12 200-299 15 200-210 2.70 2.50 0.030 0.01203 copolymer 1 2.08-2.10 100-199 20 190-200 2.70 2.50 0.035 0.01

27、52 2.07-2.10 200-299 25 190-200 2.70 2.50 0.035 0.01500 otherASee 10.1.7.BSee 10.1.3.CSee 10.1.4.DMaximum at 1112 N (250 lbf), 24 h, 70C, %.ESee 10.1.5.FSee 10.1.6.GSee 10.1.6.D1430 1729.1.1 PreformingPowder resin shall be preformed prior tomolding in the following way: Place 30 6 0.5 g of resin int

28、oa 57-mm (2.25-in.) diameter positive-pressure compressionmold and compress the material at room temperature into apreform having a density of 1.4 to 1.5 g/cm3.Apressure of 68.9MPa (10 000 psi) will satisfactorily accomplish the densifica-tion.9.1.2 MoldingPelletized resin, granular resin, and pre-f

29、orms of powder resin shall be molded in the following way:Place the preform prepared in accordance with 9.1.1 or 30 60.5 g of pelletized or granular resin on a 0.63-mm (0.025-in.)thick chrome-plated metal plate and cover with a similar plate.Place spacers, 1.91 6 0.03 mm (0.075 6 0.001 in.) thick,be

30、tween the chrome-plated metal plates and far enough apartso that they do not interfere with the flow of the resin duringmolding. Place the plates, with spacers and resin in place,between the platens of the press, the platens having beenheated to a surface temperature of 265 6 5C. Close andcontinuous

31、ly load the platens, following the rate of melting sothat the plates reach the stops within 3 min after closing thepress. Then apply sufficient pressure for 3 min more to mold asheet of the required thickness. Immediately after completionof the pressing, relieve the load, remove the plates and plast

32、icsheet together, and at once quench them in cold water (15 65C) for 5 min, supporting the sandwich in a vertical positionin the water. Then strip the 1.58 6 0.08-mm (0.062 60.003-in.) thick sheet from the metal plates. This sheet will beapproximately 75 cm2. Cut specimens from the center sectionof

33、each sheet, discarding any imperfectly molded edges.10. Test Methods10.1 The properties enumerated in this classification systemshall be determined in accordance with the following testmethods:10.1.1 ConditioningFor those tests where conditioning isrequired, the molded test specimens shall be condit

34、ioned inaccordance with Procedure A of Practice D618.10.1.2 Test ConditionsTests shall be conducted in thestandard laboratory atmosphere of 23 6 2C (73.4 6 3.6F)and 50 6 5 % relative humidity unless otherwise specified inthe test methods or in this classification system.10.1.3 Zero Strength Time (ZS

35、T)The zero strength time ofPCTFE plastics shall be determined in accordance with theprocedure described in the following paragraphs:10.1.3.1 Significance and UseControl of molecularweight of these polymers is necessary because the fabricatingtemperatures are very high and close to the point of rapid

36、thermal degradation. The test for zero strength time is wellsuited to this type of control, as it is rapid, simple, andadaptable to semiautomatic operation, and for specific PCTFEresins correlates with molecular weight.10.1.3.2 ApparatusCylindrical brass thermostat and ac-cessory equipment as specif

37、ied in Annex A1.10.1.3.3 Test StripFrom the molded sheet prepared inaccordance with Section 9 cut two strips 50 mm (2 in.) long,4.8 mm (316 in.) wide, and 1.58 6 0.08 mm (0.062 6 0.003 in.)thick, using the sample cutter. With the notching punch makea V-notch in both sides of the strips approximately

38、 at the centerline (equally distant from the ends of the 50-mm length) so thatthe notches are directly opposite each other. The cross-sectional width between the notches shall be 1.19 6 0.03 mm(0.047 6 0.001 in.), and the sides of each notch shall form anangle of 90 6 0.5 with each other.Alternative

39、ly, cut and notchthe test strips in one operation with a test specimen punchmounted in an arbor press. Dimensions of the finished test stripare shown in Fig. A1.1.10.1.3.4 ProcedureInsert one end of each notched stripinto a specimen holder (Fig. A1.1) and clip a weight of 7.5 60.1 g on the other end

40、 of the strip. The specimen holder andweight shall be at or near room temperature (23 6 10C).Insert the weighted specimens into the furnaces, which shall beat a temperature of 250 6 1C, and start the timers at themoment of insertion.As each specimen breaks and the attachedweight drops through the bo

41、ttom of the furnace, stop thecorresponding timer. Record the time in seconds indicated oneach timer. Take the average of these two readings as the zerostrength time for the duplicate specimens. If the differencebetween the two measurements exceeds 10 % of the average,reject these readings and test a

42、 second pair of specimens.10.1.3.5 Precision and BiasThe precision and bias datafor this test method is to be determined.10.1.4 Deformation Under LoadTest Method A of TestMethods D621. With 1112-N (250-lbf) load at 70 6 1C,except that it is acceptable for deformations to exceed 25 %.NOTE 2Experiment

43、al data have shown that at 1112-N (250-lbf) loadand 70C, the test for deformation under load is applicable for the purposeof classification to the materials described in this specification beyond25 % deformation.10.1.5 Melting PointThe melting point shall be deter-mined by differential scanning calo

44、rimetry (DSC) (see TestMethod D4591).10.1.5.1 For DSC measurements, the test procedure shallfollow that of the procedure section of Test Method D4591,with the exception that the reported melt temperature is thatobtained upon reheating the sample after an initial melting andrecrystallization.10.1.6 D

45、issipation Factor and Dielectric ConstantTestMethods D150.NOTE 3A disk of approximately 50-mm (2-in.) diameter has beenfound satisfactory for the test.10.1.7 Specific GravityTest Method A of Test MethodsD792. The liquid used shall be n-heptane. The average of thespecificgravity of three test specime

46、ns shall be reported.11. Inspection and Certification11.1 Inspection and certification of the material suppliedwith reference to a specification based on this classificationsystem shall be for conformance to the requirements specifiedherein.11.2 Lot-acceptance shall be the basis on which acceptanceo

47、r rejection of the lot is made. The lot-acceptance inspectionshall consist of particle size determination.11.3 Periodic check inspection with reference to a specifi-cation based on this classification system shall consist of theD1430 173tests for all requirements of the material under the specifica-

48、tion. Inspection frequency shall be adequate to ensure thematerial is certifiable in accordance with 11.4.11.4 Certification shall be that the material was manufac-tured by a process in statistical control, sampled, tested, andinspected in accordance with this classification system, andthat the aver

49、age values for the lot meet the requirements of thespecification (line callout).11.5 A report of test results shall be furnished when re-quested. The report shall consist of results of the lot-acceptanceinspection for the shipment and the results of the most recentperiodic-check inspection.12. Packaging and Package Marking12.1 The provisions of Practice D3892 apply to packaging,packing, and marking of containers for plastic materials.13. Keywords13.1 fluoropolymers; PCTFE; polychlorotrifluoroethylene;zero strength timeANNEXA1. APPARATUS FOR ZER