1、Designation: D 704 99 (Reapproved 2004)Standard Specification forMelamine-Formaldehyde Molding Compounds1This standard is issued under the fixed designation D 704; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers compression molding, thermo-setting, melamine-formaldehyde molding compounds as fur-ther defined
3、in 4.1, resin binder, with or without other resins,intimately combined with fillers, pigments, and any chemicalagents needed.1.2 The values stated in SI units are to be regarded as thestandard.NOTE 1The properties included in this specification are those re-quired to identify the types of molding co
4、mpounds covered. There may beother requirements necessary to identify particular characteristics. Thesewill be added to the specification as their inclusion becomes generallydesirable and the necessary test data and methods become available.Transfer or injection molding will usually result in differ
5、ent physical andelectrical characteristics 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 Documents2.1 ASTM Standards:2D 149 Test Method for Dielectric Breakdown Voltage
6、 andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 150 Test Methods for A-C Loss Characteristics andPermittivity (Dielectric Constant) of Solid Electrical Insu-lationD 256 Test Method for Determining the Izod PendulumImpact Resistance of PlasticsD 495 Te
7、st Method for High-Voltage, Low-Current, DryArc Resistance of Solid Electrical InsulationD 570 Test Method for Water Absorption of PlasticsD 618 Practice for Conditioning Plastics for TestingD 648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load in the Edgewise PositionD 731 Tes
8、t Method for Molding Index of ThermosettingMolding PowderD 790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating MaterialsD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 883 Terminology Relating
9、to PlasticsD 1895 Test Methods for Apparent Density, Bulk Factor,and Pourability of Plastic MaterialsD 1896 Practice for Transfer Molding Test Specimens ofThermosetting CompoundsD 3638 Test Method for Comparative Tracking Index ofElectrical Insulating MaterialsD 3795 Test Method for Thermal Flow, Cu
10、re, and BehaviorProperties of Pourable Thermosetting Materials by TorqueRheometerD 3892 Practice for Packaging/Packing of PlasticsD 5224 Practice for Compression Molding Test Specimensof Thermosetting Molding CompoundsD 6289 Test Method for Measuring Shrinkage from MoldDimensions of Molded Thermoset
11、ting Plastics2.2 ASTM Manual:Manual 7A Manual on Presentation of Data and ControlChart Analysis, Seventh Edition32.3 ISO Standard:ISO 2122-1977(E) PlasticsAminoplastic MoldingMaterialsSpecification43. Terminology3.1 DefinitionsFor definitions of technical terms pertain-ing to plastics used in this s
12、pecification see TerminologyD 883.4. 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 ASTM Committee D20 onPlastics and is the direct resp
13、onsibility of Subcommittee D20.16 on ThermosettingMaterials.Current edition approved October 1, 2004. Published December 2004. Originallyapproved in 1943. Last previous edition approved in 1999 as D 704 - 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custome
14、r 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 MNL7A.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, Ne
15、w 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 19428-2959, United States.4.1.1 Type 1General-purpose compound with cellulosefiller, available in colors, white, and black. Suit
16、able 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 3Acompound with chopped cotton-cloth filler,having greater impact strength than the other Types 1 through7
17、.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 mechanical and electric applications.4.1.6 Type 7Similar to Type 6, but with cellulose filler andimproved in
18、sert-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 stability and mechanical properties.4.1.9 Type 10A glass fiber-filled compound, with mediumimpact strength
19、.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 molding compounds are of a limited storagestability. Melamine resins advance rapidly when stored at eleva
20、tedtemperatures.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.6. Property Requirements6.1 The molding compounds covered by this specification,when molded in acco
21、rdance with Practice D 5224, shallconform to the requirements prescribed in Table 1.6.2 The required plasticity shall be agreed upon between thepurchaser and producer or supplier. Test Methods D 731 andD 3795 are suggested for measuring plasticity and rate of cure.6.3 The requirements in Table 1 sha
22、ll 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 practicable, and the range of test results must always bereported. For all other tests, a single
23、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 the molding compound and themolded part, as well as mold design, molding process, and moldingconditi
24、ons, also influence test results.NOTE 6A method for determining 99 % confidence limits is given inManual 7A.7. Sampling7.1 A batch or lot shall be considered as a unit of manufac-ture and may consist of a blend of two or more production runsof compound.7.2 Adequate statistical sampling shall be used
25、.8. Test Specimen Preparation8.1 Where molded specimens are required, Practice D 5224shall be followed as applicable (Note 7). Molds shall beconstructed in accordance with Practice D 1896.NOTE 7Some melamine compounds may not feed, plasticize, or moldsatisfactorily at the designated temperatures of
26、Practice D 5224. 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, store and condi-tion the samples as described in Test Method D 731.9.2 Condition molded test spec
27、imens in accordance withProcedure B of Practice D 618.9.3 Conduct all testing in the Standard Laboratory Atmo-sphere as specified in Practice D 618, unless otherwise speci-fied in the referenced test methods or in this specification.10. Test Methods10.1 Determine the properties enumerated in this sp
28、ecifica-tion in accordance with the following methods:10.1.1 Bulk FactorTest Methods D 1895, using the ap-propriate method for the compound involved.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
29、gravity, 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
30、 40.0 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 7
31、0 180 180 180 180 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.D 704 99 (2004)210.1.2 Speci
32、fic GravityMethod A of Test Methods D 792.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 AbsorptionTest Method D 570, 24-h immer-sion procedure.10.1.4 Impact Resistance (Izod)Method
33、 A of Test Meth-ods D 256, using a 12.7 by 12.7 by 63.5-mm bar.10.1.5 Flexural StrengthMethod I, Procedure A of TestMethods D 790, using a 6.4 by 12.7 by 127-mm bar, testedparallel to molding pressure.10.1.6 Deflection TemperatureTest Method D 648,atafiber stress of 1.82 MPa on a 12.7 by 12.7 by 127
34、-mm bar,loaded perpendicular to molding pressure at a 102-mm span.10.1.7 Dielectric StrengthTest Methods D 149, usingspecimens 3.2 by 102 mm or larger, tested under transformeroil between cylindrical brass electrodes 25.4 mm in diameter,with edges next to specimen rounded to a radius of 3.2 mm anda
35、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-time test determines the initial voltage for thestep-by-step test.10.1.8 Permittiv
36、ity and Dissipation FactorTest MethodD 150, using a 3.2 by 102-mm specimen for all frequencies upto and including 1 MHz.10.1.9 Arc ResistanceTest Method D 495, using tungstenelectrodes.10.1.10 ShrinkageTest Method D 6289.10.1.11 Comparative Tracking Index (CTI)Test MethodD 3638.11. Packaging and Pac
37、kage Marking11.1 All packing, packaging, and marking provisions ofPractice D 3892 shall apply to this specification.12. Keywords12.1 formaldehyde; melamine-formaldehyde; molding com-pounds (thermosetting)SUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this specific
38、ation since the last issue,D 704 - 99, that may impact the use of this specification. (October 1, 2004)(1) Five year review. Reapproval without change.Committee D20 has identified the location of selected changes to this specification since the last issue,D 704 - 94, that may impact the use of this
39、specification. (November 10, 1999)(1) Editorial change to clarify scope in 1.1.(2) Removed inch-pound units throughout.(3) Deleted references to Practice D 1898 as Practice D 1898has been discontinued with no replacement.(4) Practice D 647 has been replaced by Practice D 1896;Method D 955 has been r
40、eplaced by Practice D 6289; and,Practice D 956 has been replaced by Practice D 5224.(5) Revised 6.1, 6.3, 7.2, 8.1 and Notes 6 and 7 reflectingdiscontinued and replacement standards.(6) Added Summary of Changes.ASTM International takes no position respecting the validity of any patent rights asserte
41、d 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 revision at any time by th
42、e 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 comments will receive
43、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 copyrighted by ASTM Internat
44、ional, 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).D 704 99 (2004)3
