1、Designation: D 1430 03 (Reapproved 2008)Standard Classification System forPolychlorotrifluoroethylene (PCTFE) Plastics1This standard is issued under the fixed designation D 1430; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This classification system c
3、overs polychlorotrifluoroet-hylene (PCTFE) plastics that consist of at least 90 % chlorot-rifluoroethylene and are suitable for extrusion and for com-pression and injection molding. The remaining 10 % mayinclude chemical modifications, such as co-monomers, but notcolorants, fillers, plasticizers, or
4、 mechanical blends 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,
5、the numerical values listed in Table 1apply only to the test specimens molded in accordance withSection 8.These values may not be applicable as design criteriato parts prepared and annealed under other conditions.1.3 The values stated in SI units as detailed in IEEE/ASTMSI 10 are to be regarded as t
6、he 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. It
7、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, data ob
8、tained usingeither are technically equivalent.2. Referenced Documents2.1 ASTM Standards:2D 150 Test Methods for AC Loss Characteristics and Per-mittivity (Dielectric Constant) of Solid Electrical Insula-tionD 618 Practice for Conditioning Plastics for TestingD 621 Test Methods for Deformation of Pla
9、stics UnderLoad3D 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 toPlasticsD2117 Test Method for Melting Point of SemicrystallinePolymers by the Hot Stage Microsc
10、opy Method3D 3418 Test Method for Transition Temperatures and En-thalpies of Fusion and Crystallization of Polymers byDifferential Scanning CalorimetryD 3892 Practice for Packaging/Packing of PlasticsD 4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by Differe
11、ntialScanning Calorimetry2.2 ISO Standard:4ISO 12086-1 (1995) PlasticsFluoropolymer Dispersionsand Moulding and Extrusion Materials, Part 1ISO 12086-2 (1995) PlasticsFluoropolymer Dispersionsand Moulding and Extrusion Materials, Part 23. Terminology3.1 DefinitionsDefinitions of terms used in this cl
12、assifi-cation system shall be in accordance with Terminology D 883.3.1.1 lot, none production run or uniform blend of two ormore production runs. D 48953.2 Definitions of Terms Specific to This Standard:3.2.1 preforming, na process to compress the materialunder pressure in a mold to form a preform.3
13、.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.1This classification system is under the jurisdiction ofASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D
14、20.15 on ThermoplasticMaterials (Section D20.15.12).Current edition approved April 1, 2008. Published July 2008. Originallyapproved in 1956. Last previous edition approved in 2003 as D 1430 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at se
15、rviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn4Available 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
16、appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.3 Abbreviations:AbbreviationsAbbreviated terms are inaccordance with Terminology D 1600.4. Classification4.1 PCTFE materials in powders and pellets
17、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 classification system is given as follows:Group 01 = PCTFEClass 1 = homopolymerGrade 2 = having p
18、roperties 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 molding or extrusion material shall be of uniformcomposition and so compounded as to conform to the requ
19、ire-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 Table 1.7. Sampling7.1 Sampling shall be statistically adequate to satisfy therequirements of 11.4.8.
20、 Number of Tests8.1 One set of test specimens as prescribed in Section 9shall be considered sufficient for testing each 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 f
21、rom compression-moldedsheets 1.58 6 0.08 mm (0.062 6 0.003 in.) thick, preparedfrom the resins in the following manner:9.1.1 PreformingPowder resin shall be preformed prior tomolding in the following way: Place 30 6 0.5 g of resin intoa 57-mm (2.25-in.) diameter positive-pressure compressionmold and
22、 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-forms of powder resin shall be molded in the following way:Place th
23、e 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,between the chrome-plated metal plates and far enough apartso that t
24、hey 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 andcontinuously load the platens, following the rate of melting sothat the plat
25、es 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 plasticsheet together, and at once quench them in cold water (15 65C) f
26、or 5 min, supporting the sandwich in a vertical positionin the water. Then strip the 1.58 6 0.08-mm (0.062 6TABLE 1 Requirements for PCTFE Molded Test SpecimensPropertiesGroup Class Description GradeSpecificGravity,A23/23CZeroStrengthTime, sBDeformationUnderLoadC,DMeltingPoint,CEDielectric ConstantF
27、, 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 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-
28、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 0.0152 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.D 1430 03 (2008
29、)20.003-in.) thick sheet from the metal plates. This sheet will beapproximately 75 cm2. Cut specimens from the center sectionof each sheet, discarding any imperfectly molded edges.10. Test Methods10.1 The properties enumerated in this classification systemshall be determined in accordance with the f
30、ollowing testmethods:10.1.1 ConditioningFor those tests where conditioning isrequired, the molded test specimens shall be conditioned inaccordance with Procedure A of Practice D 618.10.1.2 Test ConditionsTests shall be conducted in thestandard laboratory atmosphere of 23 6 2C (73.4 6 3.6F)and 50 6 5
31、 % relative humidity unless otherwise specified inthe test methods or in this classification system.10.1.3 Zero Strength Time (ZST)The zero strength timeof PCTFE plastics shall be determined in accordance with theprocedure described in the following paragraphs:10.1.3.1 Significance and UseControl of
32、 molecularweight of these polymers is necessary because the fabricatingtemperatures are very high and close to the point of rapidthermal 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 specif
33、ic PCTFEresins correlates with molecular weight.10.1.3.2 ApparatusCylindrical brass thermostat and ac-cessory equipment as specified 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 (
34、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 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 s
35、hall 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.Alternatively, 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
36、 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 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 temperatur
37、e of 250 6 1C, and start the timers at themoment of insertion.As each specimen breaks and the attachedweight drops through the bottom 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 th
38、e duplicate specimens. If the differencebetween the two measurements exceeds 10 % of the average,reject these readings and test a 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 Test
39、Methods D 621. With 1112-N (250-lbf) load at 70 6 1C,except that permissible deformations may exceed 25 %.NOTE 2Experimental 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 spe
40、cification beyond25 % deformation.10.1.5 Melting PointThe melting point shall be deter-mined either by optical microscopy (see Test Method D2117)or differential scanning calorimetry (DSC) (see Test MethodD 4591). Both test methods give equivalent melting pointsafter each sample receives a similar co
41、oling history from themelt. Since rapid cooling may give a poor birefringence signal(see Note 3, Test Method D2117) and a broad, poorly definedmelt temperature, a sufficiently slow cooling rate should beselected to give a sharp, well-defined melt temperature onreheating.10.1.5.1 For optical microsco
42、py (see Test Method D2117),the sample shall be a portion of the compression-molded sheetprepared in accordance with the sampling section which hasbeen remolded to a film 0.01 to 0.04 mm (0.4 to 1.6 mils) thickbetween the chrome-plated metal plates in a press with platensheated to a surface temperatu
43、re of 265 6 5C.10.1.5.2 For DSC measurements, the test procedure shallfollow that of the procedure section of Test Method D 4591,with the exception that the reported melt temperature is thatobtained upon reheating the sample after an initial melting andrecrystallization. Since rapid cooling may give
44、 a broad, poorlydefined melt temperature, a sufficiently slow cooling rateshould be selected to give a sharp, well-defined temperature onreheating.10.1.6 Dissipation Factor and Dielectric ConstantTestMethods D 150.NOTE 3A disk of approximately 50-mm (2-in.) diameter has beenfound satisfactory for th
45、e test.10.1.7 Specific GravityTest Method A of Test MethodsD 792. The liquid used shall be n-heptane. The average of thespecificgravity of three test specimens shall be reported.11. Inspection and Certification11.1 Inspection and certification of the material suppliedwith reference to a specificatio
46、n based on this classificationsystem shall be for conformance to the requirements specifiedherein.11.2 Lot-acceptance shall be the basis on which acceptanceor rejection of the lot is made. The lot-acceptance inspectionshall consist of particle size determination.11.3 Periodic check inspection with r
47、eference to a specifi-cation based on this classification system shall consist of thetests for all requirements of the material under the specifica-tion. Inspection frequency shall be adequate to ensure thematerial is certifiable in accordance with 11.4.11.4 Certification shall be that the material
48、was manufac-tured by a process in statistical control, sampled, tested, andinspected in accordance with this classification system, andthat the average 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 re
49、port shall consist of results of the lot-acceptanceinspection for the shipment and the results of the most recentperiodic-check inspection.D 1430 03 (2008)312. Packaging and Package Marking12.1 The provisions of Practice D 3892 apply to packaging,packing, and marking of containers for plastic materials.13. Keywords13.1 fluoropolymers; PCTFE; polychlorotrifluoroethylene;zero strength timeANNEX(Mandatory Information)A1. APPARATUS FOR ZERO STRENGTH TIME TESTA1.1 Cylindrical Brass ThermostatA1.1.1 Acylindrical brass thermostat, Fig.A1.1, 127 mm
