1、Designation: D 1430 03Standard 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 year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 covers polychlorot
3、rifluoroet-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 mechanical blend
4、s 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 val
5、ues 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 the standard. The
6、values given inbrackets 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 is theresponsibility
7、 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 obtained usingeither a
8、re technically equivalent.2. Referenced Documents2.1 ASTM Standards:D 150 Test Methods for A-C Loss Characteristics andPermittivity (Dielectric Constant) of Solid Electrical Insu-lation2D 618 Practice for Conditioning Plastics for Testing3D 621 Test Methods for Deformation of Plastics UnderLoad4D 79
9、2 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by Displacement3D 883 Terminology Relating to Plastics3D 1600 Terminology for Abbreviated Terms Relating toPlastics3D2117 Test Method for Melting Point of SemicrystallinePolymers by the Hot Stage Microscopy Method5D 3418
10、 Test Method for Transition Temperatures of Poly-mers by Differential Scanning Calorimetry6D 3892 Practice for Packaging/Packing of Plastics6D 4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning Calorimetry72.2 ISO Standard:8ISO 12086-1 (19
11、95) 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 classifi-cation system shall be in accordance with Terminolo
12、gy 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.3.2.2 zero strength time (ZST ), ntime measured in accor-da
13、nce with Section 10 of this classification system to check therelative molecular weight of PCTFE material.3.3 Abbreviations:AbbreviationsAbbreviated terms are inaccordance with Terminology D 1600.1This classification system is under the jurisdiction ofASTM Committee D20 onPlastics and is the direct
14、responsibility of Subcommittee D20.15 on ThermoplasticMaterials (Section D20.15.12).Current edition approved July 10, 2003. Published September 2003. Originallyapproved in 1956. Last previous edition approved in 2000 as D 1430 00.2Annual Book of ASTM Standards, Vol 10.01.3Annual Book of ASTM Standar
15、ds, Vol 08.01.4These test methods were withdrawn with no replacement in 1994. Test MethodsD 621 can be obtained from Global Engineering Documents, 15 Inverness WayEast, Englewood, CO 80112.5Discontinued; see 1993 Annual Book of ASTM Standards, Vol 08.01.6Annual Book of ASTM Standards, Vol 08.02.7Ann
16、ual Book of ASTM Standards, Vol 08.03.8Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
17、19428-2959, United States.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 classificat
18、ion 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 molding or extrusi
19、on 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 Table 1.7. Samp
20、ling7.1 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 batch. Theaverage result for the specimens tested shall conform to therequirements prescribed
21、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:9.1.1 PreformingPowder resin shall be preformed prior tomolding in the following way: Place 30 6
22、0.5 g of resin intoa 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 re
23、sin, and pre-forms 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
24、. thick,between 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 and
25、continuously 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
26、 and plasticsheet 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 sec
27、tionof 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:TABLE 1 Requirements for PCTFE Molded Test SpecimensPropertiesGroup Class Description GradeSpecificG
28、ravity,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 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
29、.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 0.0152 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.DM
30、aximum at 1112 N 250 lbf, 24 h, 70C, %.ESee 10.1.5.FSee 10.1.6.GSee 10.1.6.D143003210.1.1 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 thesta
31、ndard laboratory atmosphere of 23 6 2C 73.4 6 3.6Fand 50 6 5 % 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
32、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 rapidthermal degradation. The test for zero strength time is wellsuited to this type of control, as it is rapid, sim
33、ple, andadaptable to semiautomatic operation, and for specific 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
34、 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 at the centerline (equally distant from the ends of the 50-mm length) so thatthe notches are directly opposite each
35、other. The cross-sectional width between the notches shall be 1.19 6 0.03 mm0.047 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 th
36、e 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 of the strip. The specimen holder andweight shall be at or near room temperature (23 6 10C).Insert the weighted specim
37、ens 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 bottom of the furnace, stop thecorresponding timer. Record the time in seconds indicated oneach timer. Take the average o
38、f 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 second pair of specimens.10.1.3.5 Precision and BiasThe precision and bias datafor this test method is to be determine
39、d.10.1.4 Deformation Under LoadTest Method A of TestMethods 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 class
40、ification to the materials described in this specification 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 melti
41、ng pointsafter each sample receives a similar cooling 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 tempe
42、rature onreheating.10.1.5.1 For optical microscopy (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 p
43、ress with platensheated to a surface temperature 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 andr
44、ecrystallization. Since rapid cooling may give 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
45、. diameter has beenfound satisfactory for the 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 mater
46、ial 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 acceptanceor rejection of the lot is made. The lot-acceptance inspectionshall consist of particle size determi
47、nation.11.3 Periodic check inspection with reference 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
48、.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 average values for the lot meet the requirements of thespecification (line callout).11.5 A report of test result
49、s 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 D 3892 apply to packaging,packing, and marking of containers for plastic materials.13. Keywords13.1 fluoropolymers; PCTFE; polychlorotrifluoroethylene;zero strength timeD1430033ANNEX(Mandatory Information)A1. APPARATUS FOR ZERO STRENGTH TIME TESTA1.1 Cylindrical Brass The
