1、Designation: D704 99 (Reapproved 2012)Standard Specification forMelamine-Formaldehyde Molding Compounds1This standard is issued under the fixed designation D704; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. 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 specification covers compression molding
3、,thermosetting, melamine-formaldehyde molding compoundsas further defined in 4.1, resin binder, with or without otherresins, intimately combined with fillers, pigments, and anychemical agents needed.1.2 The values stated in SI units are to be regarded as thestandard.NOTE 1The properties included in
4、this specification are those requiredto identify the types of molding compounds covered. There may be otherrequirements necessary to identify particular characteristics. These will beadded to the specification as their inclusion becomes generally desirableand the necessary test data and methods beco
5、me available. Transfer orinjection molding will usually result in different physical and electricalcharacteristics than compression molding.NOTE 2ISO 2122-1977(E) is similar but not equivalent to thisspecification. Product classification and characterization are not equiva-lent.2. Referenced Documen
6、ts2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity (Dielectric Constant) of Solid Electrical InsulationD256 Test Methods
7、for Determining the Izod PendulumImpact Resistance of PlasticsD495 Test Method for High-Voltage, Low-Current, Dry ArcResistance of Solid Electrical InsulationD570 Test Method for Water Absorption of PlasticsD618 Practice for Conditioning Plastics for TestingD648 Test Method for Deflection Temperatur
8、e of PlasticsUnder Flexural Load in the Edgewise PositionD731 Test Method for Molding Index of ThermosettingMolding PowderD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD792 Test Methods for Density and Specific Gravity (Rela-tive
9、 Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1895 Test Methods for Apparent Density, Bulk Factor, andPourability of Plastic MaterialsD1896 Practice for Transfer Molding Test Specimens ofThermosetting CompoundsD3638 Test Method for Comparative Tracking Index ofElectrical
10、 Insulating MaterialsD3795 Test Method for Thermal Flow, Cure, and BehaviorProperties of Pourable Thermosetting Materials by TorqueRheometerD3892 Practice for Packaging/Packing of PlasticsD5224 Practice for Compression Molding Test Specimens ofThermosetting Molding CompoundsD6289 Test Method for Mea
11、suring Shrinkage from MoldDimensions of Molded Thermosetting Plastics2.2 ASTM Manual:Manual 7 Manual on Presentation of Data and Control ChartAnalysis, 8th Edition32.3 ISO Standard:ISO 2122-1977(E) PlasticsAminoplastic MoldingMaterialsSpecification43. Terminology3.1 DefinitionsFor definitions of tec
12、hnical terms pertain-ing to plastics used in this specification see Terminology D883.4. Classification4.1 The molding compounds covered by this specificationshall be designated by types, based upon their principalcharacteristics and the fillers used.1This specification is under the jurisdiction of A
13、STM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.16 on ThermosettingMaterials.Current edition approved Dec. 1, 2012. Published December 2012. Originallyapproved in 1943. Last previous edition approved in 2004 as D704 - 99(2004). DOI:10.1520/D0704-99R12.2For reference
14、d ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from ASTM International Headquarters. Request MNL78TH.4Available
15、 from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New 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 States14.1.
16、1 Type 1General-purpose compound with cellulosefiller, available in colors, white, and black. Suitable for general,mechanical, and electrical applications.4.1.2 Type 2A mineral- and flock-filled compound forindustrial uses involving elevated-temperature and electricalapplications.4.1.3 Type 3A compo
17、und with chopped cotton-cloth filler,having greater impact strength than the other Types 1 through7.4.1.4 Type 5Unreinforced molding compound with hightranslucency, particularly suited for small pearlescent mold-ings.4.1.5 Type 6A wood-filled compound for general indus-trial uses involving mechanica
18、l and electric applications.4.1.6 Type 7Similar to Type 6, but with cellulose filler andimproved insert-holding properties.4.1.7 Type 8A glass-fiber-reinforced compound with highimpact strength and good electrical properties.4.1.8 Type 9Short-fiber, glass-filled compound with gooddimensional stabili
19、ty and mechanical properties.4.1.9 Type 10A glass fiber-filled compound, with mediumimpact strength.4.1.10 Type 11A glass-filled, chopped strand compoundwith extremely high impact strength and good arc resistance.4.1.11 Type 12A fabric-filled compound with mediumimpact strength.NOTE 3Melamine moldin
20、g compounds are of a limited storagestability. Melamine resins advance rapidly when stored at elevatedtemperatures.5. Ordering Information5.1 The order for the compound shall specify name, type,color, and plasticity.NOTE 4Compounds with a higher bulk factor than specified in Table1 may be available.
21、6. Property Requirements6.1 The molding compounds covered by this specification,when molded in accordance with Practice D5224, shall con-form to the requirements prescribed in Table 1.6.2 The required plasticity shall be agreed upon between thepurchaser and producer or supplier. Test Methods D731 an
22、dD3795 are suggested for measuring plasticity and rate of cure.6.3 The requirements in Table 1 shall be considered asminimum or maximum average values. Individual test resultsmay vary 610 % from the average, in most cases (Note 5). Inthe case of arc resistance, all test results must be averaged,when
23、 practicable, and the range of test results must always bereported. For all other tests, a single result beyond the range offour times the estimated standard deviation must be discarded,retests made, and the resulting value substituted for thediscarded value (Note 6).NOTE 5The moisture content of th
24、e molding compound and themolded part, as well as mold design, molding process, and moldingconditions, also influence test results.NOTE 6A method for determining 99 % confidence limits is given inManual 7.7. Sampling7.1 A batch or lot shall be considered as a unit of manufac-ture and may consist of
25、a blend of two or more production runsof compound.7.2 Adequate statistical sampling shall be used.8. Test Specimen Preparation8.1 Where molded specimens are required, Practice D5224shall be followed as applicable (Note 7). Molds shall beconstructed in accordance with Practice D1896.NOTE 7Some melami
26、ne compounds may not feed, plasticize, or moldsatisfactorily at the designated temperatures of Practice D5224. In suchcases the recommendation of the manufacturer shall be followed.9. Conditioning9.1 Measure the plasticity on compounds in the “as re-ceived” condition. However, for referee tests, sto
27、re and condi-tion the samples as described in Test Method D731.9.2 Condition molded test specimens in accordance withProcedure B of Practice D618.TABLE 1 Requirements for Compression-Molded Test SpecimensAPropertyTypes12 35 6 78910112Bulk factor, max 2.7 3.0 . . 2.9 . . 4.0 5.0 10.0 14.0Specific gra
28、vity, max 1.60 1.80 1.60 1.55 1.60 1.55 2.00 1.90 2.20 2.00 1.55Water absorption, max, weight 0.40 0.25 0.60 0.35 0.60 0.60 0.20 0.15 0.20 0.20 0.50gain %Impact resistance, min, J/m of notch 13.3 16.0 29.4 7.5 16.0 16.0 170.8 32.0 48.0 1066 53.3Flexural strength, min, MPa 68.9 51.0 82.7 65.5 44.8 40
29、.0 68.9 96.5 82.7 137.8 96.5Deflection temperature, min, C 177 168 162.7 148.8 166 166 204 196 166 204 202Dielectric strength, min, S/S, kV/mm 9.8 9.8 3.9 . 7.9 7.9 6.7 9.45 9.06 . 6.89Dissipation factor, max,1 MHz0.05 0.060 . . 0.055 . . 0.02 0.02 . 0.07Arc resistance, min, s 120 180 125 . 180 70 1
30、80 180 180 180 140Shrinkage, max, m/m 0.008 0.006 0.005 0.012 0.008 0.008 0.003 0.004 0.003 0.004 0.005CTI, min, V 500 . 600 . 400 . . . . 700 .AThe values shown herein were obtained under specified conditions. Any other conditions may significantly alter these values.D704 99 (2012)29.3 Conduct all
31、testing in the Standard Laboratory Atmo-sphere as specified in Practice D618, unless otherwise specifiedin the referenced test methods or in this specification.10. Test Methods10.1 Determine the properties enumerated in this specifica-tion in accordance with the following methods:10.1.1 Bulk FactorT
32、est Methods D1895, using the appro-priate method for the compound involved.10.1.2 Specific GravityMethod A of Test Methods D792.A 3.2 by 51-mm disk is a recommended specimen for com-pounds containing long-fiber fillers that are subject to resin-squeeze-out and flow under pressure.10.1.3 Water Absorp
33、tionTest Method D570, 24-h immer-sion procedure.10.1.4 Impact Resistance (Izod)Method A of Test Meth-ods D256, using a 12.7 by 12.7 by 63.5-mm bar.10.1.5 Flexural StrengthMethod I, Procedure A of TestMethods D790, using a 6.4 by 12.7 by 127-mm bar, testedparallel to molding pressure.10.1.6 Deflectio
34、n TemperatureTest Method D648,atafiber stress of 1.82 MPa on a 12.7 by 12.7 by 127-mm bar,loaded perpendicular to molding pressure at a 102-mm span.10.1.7 Dielectric StrengthTest Methods D149, usingspecimens 3.2 by 102 mm or larger, tested under transformeroil between cylindrical brass electrodes 25
35、.4 mm in diameter,with edges next to specimen rounded to a radius of 3.2 mm anda length of 25.4 mm. The rate of rise for the short-time testshall be 0.5 kV/s (Note 8). For the step-by-step test theincrement of voltage increase shall be 2 kV and shall beapplied for a period of 1 min.NOTE 8The short-t
36、ime test determines the initial voltage for thestep-by-step test.10.1.8 Permittivity and Dissipation FactorTest MethodD150, using a 3.2 by 102-mm specimen for all frequencies upto and including 1 MHz.10.1.9 Arc ResistanceTest Method D495, using tungstenelectrodes.10.1.10 ShrinkageTest Method D6289.1
37、0.1.11 Comparative Tracking Index (CTI)Test MethodD3638.11. Packaging and Package Marking11.1 All packing, packaging, and marking provisions ofPractice D3892 shall apply to this specification.12. Keywords12.1 formaldehyde; melamine-formaldehyde; molding com-pounds (thermosetting)SUMMARY OF CHANGESCo
38、mmittee D20 has identified the location of selected changes to this specification since the last issue,D704 - 99(2004), that may impact the use of this specification. (December 1, 2012)(1) Five year review. Reapproval without change.ASTM International takes no position respecting the validity of any
39、 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 such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revi
40、sion 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 invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your
41、comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyri
42、ghted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this 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/).D704 99 (2012)3
