1、Designation: D 705 99 (Reapproved 2004)Standard Specification forUrea-Formaldehyde Molding Compounds1This standard is issued under the fixed designation D 705; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. 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, urea-formaldehyde molding compounds as furtherdefined in 3.1.1.2
3、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 compounds covered. There may beother requirements necessary to identify particular characteristics. Trans-fer or injection molding
4、will usually result in different physical andelectrical characteristics than compression molding.1.3 The following safety hazards caveat pertains only to thetest method portion, Section 7, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated w
5、ith its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE 2ISO 2112-1977(E) is similar but not equivalent to thisspecification. Product classification and characte
6、rization are not the same.2. Referenced Documents2.1 ASTM Standards:2D 149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 256 Test Method for Determining the Izod PendulumImpact Resistance of PlasticsD 495
7、Test 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 790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating
8、 MaterialsD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 956 Practice for Compression Molding Specimens ofAmino Molding Compounds3D 3892 Practice for Packaging/Packing of Plastics2.2 ISO Standard:ISO 2112-1977(E) PlasticsAminoplastic MouldingMate
9、rialsSpecification43. Classification3.1 The molding compounds covered by this specificationshall be designated by types, based upon their principalcharacteristics and the fillers used.3.1.1 Type 1A general purpose molding compound withalpha-cellulose filler.3.1.2 Type 2A general purpose molding comp
10、ound withcellulose filler other than alpha-cellulose.4. General Requirements4.1 The molding compounds shall be of uniform composi-tion. The apparent density, bulk factor, plasticity, particle size,and color shall be compounded as to conform to the require-ments prescribed in this specification.5. De
11、tail Requirements5.1 Test specimens molded in accordance with PracticeD 956 shall conform to the requirements prescribed in Table 1.6. Sampling6.1 A batch of molding compound shall be considered as aunit of manufacture as prepared for shipment and may consistof a blend of two or more production runs
12、.6.2 Adequate statistical sampling shall be used.7. Test Methods7.1 The properties enumerated in this specification shall bedetermined in accordance with the following methods:7.1.1 Conditioning Test SpecimensMolded test specimensshall be conditioned in accordance with Procedure B ofPractice D 618,
13、except for the tests for arc resistance anddielectric strength, where Procedure A shall be used.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.16 on ThermosettingMaterials.Current edition approved October 1, 2004. P
14、ublished December 2004. Originallyapproved in 1943. Last previous edition approved in 1999 as D 705 - 99.2For referenced 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 standar
15、ds Document Summary page onthe ASTM website.3Withdrawn 1992. Replaced by Practice D 5224.4Available 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 Bar
16、r Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.1.2 Test ConditionsTests shall be conducted in thestandard laboratory atmosphere of 23 6 1C and 50 6 2%relative humidity, unless otherwise specified in the testingmethods or in this specification.7.1.3 Specific GravityMet
17、hod A of Test Methods D 792.7.1.4 Flexural StrengthTest Methods D 790, ProcedureA,Method I, using a 6.4 by 12.7 by 127-mm bar tested parallel tomolding pressure.7.1.5 Impact Resistance (Izod)Method A of Test MethodsD 256, using a specimen measuring 12.7 by 12.7 by 63.5 mmand notched on the side para
18、llel to the direction of moldingpressure.7.1.6 Water AbsorptionTest Method D 570, using the24-h immersion procedure.7.1.7 Dielectric StrengthTest Methods D 149, except thatthe test specimens shall be compression-molded disks or plates3.2 mm in thickness.7.1.8 Arc ResistanceTest Method D 495, using t
19、ungstenrod electrodes.8. Packaging and Package Marking8.1 PackagingThe compound shall be packaged in stan-dard commercial containers, so constructed as to ensureacceptance by common or other carriers for safe transportationat the lowest rate to the point of delivery.8.2 Package MarkingShipping conta
20、iners shall bemarked with the name of the compound, type, color, and thequantity contained therein, as defined by the contract or orderunder which shipment is made, the name of the manufacturer,and the number of the contract or order.8.3 All packing, packaging, and marking provisions ofPractice D 38
21、92 shall apply to this specification.9. Keywords9.1 formaldehyde; molding compounds (thermosetting);urea-formaldehydeSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue, D 705 99,that may impact the use of this standard. (October 1, 2
22、004)(1) Five year review. Reapproval without change.Committee D20 has identified the location of selected changes to this standard since the last issue, D 705 94,that may impact the use of this standard. (November 10, 1999)(1) Editorial change to clarify scope.(2) Removed inch-pound units.(3) Delete
23、d reference to Practice D 1898 as it has beendiscontinued without replacement.(4) Revised 6.2 deleting reference to Practice D 1898.(5) Added Summary of Changes section.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
24、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 the responsible technical committee and must
25、 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 careful consideration at a meeting of ther
26、esponsible 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 International, 100 Barr Harbor Drive, PO Box C700,
27、 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).TABLE 1 Deta
28、il Requirements for Compression-Molded TestSpecimensNOTE 1ASTM Committee D20 on Plastics recognizes the existenceof two types having essentially the same physical and electrical properties.The two types are continued, however, since Type 1 has unlimited colorpossibilities, while Type 2 is limited to
29、 a relatively few dark, opaquecolors.Type 1 Type 2Specific gravity, 23/23C:min 1.45 1.45Flexural strength, min:MPa 55.2 51.7Impact resistance (Izod), min, J/m of notch 10.7 10.7Water absorption, max, weight gain, % 2.0 2.0Dielectric strength, 23C, min, kV/mm:short-time test 11.8 11.8step-by-step test 7.9 7.9Arc resistance, min, s 80 .D 705 99 (2004)2
