1、Designation: D705 99 (Reapproved 2012)Standard Specification forUrea-Formaldehyde Molding Compounds1This standard is issued under the fixed designation D705; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers compression moldingthermosetting, urea-formaldehyde molding compounds as fur-ther defined in 3.1.1.2 The
3、 values stated in SI units are to be regarded as thestandard.NOTE 1The properties included in this specification are those requiredto identify the types of molding compounds covered. There may be otherrequirements necessary to identify particular characteristics. Transfer orinjection molding will us
4、ually result in different physical and electricalcharacteristics 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 with its
5、 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 characterizatio
6、n are not the same.2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD495 Test Meth
7、od for High-Voltage, Low-Current, Dry ArcResistance of Solid Electrical InsulationD570 Test Method for Water Absorption of PlasticsD618 Practice for Conditioning Plastics for TestingD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD
8、792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD956 Practice for Compression Molding Specimens ofAmino Molding Compounds (Withdrawn 1992)3D3892 Practice for Packaging/Packing of Plastics2.2 ISO Standard:ISO 2112-1977(E) PlasticsAminoplastic MouldingM
9、aterialsSpecification43. 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 c
10、ompound 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.
11、 Detail Requirements5.1 Test specimens molded in accordance with PracticeD956 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 ru
12、ns.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:1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcomm
13、ittee D20.16 on ThermosettingMaterials.Current edition approved Dec. 1, 2012. Published December 2012. Originallyapproved in 1943. Last previous edition approved in 2004 as D705 - 99(2004). DOI:10.1520/D0705-99R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM C
14、ustomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute (ANSI), 2
15、5 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 States17.1.1 Conditioning Test SpecimensMolded test specimenssha
16、ll be conditioned in accordance with Procedure B ofPractice D618, except for the tests for arc resistance anddielectric strength, where Procedure A shall be used.7.1.2 Test ConditionsTests shall be conducted in thestandard laboratory atmosphere of 23 6 1C and 50 6 2%relative humidity, unless otherwi
17、se specified in the testingmethods or in this specification.7.1.3 Specific GravityMethod A of Test Methods D792.7.1.4 Flexural StrengthTest Methods D790, Procedure A,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
18、256, using a specimen measuring 12.7 by 12.7 by 63.5 mmand notched on the side parallel to the direction of moldingpressure.7.1.6 Water AbsorptionTest Method D570, using the 24-himmersion procedure.7.1.7 Dielectric StrengthTest Methods D149, except thatthe test specimens shall be compression-molded
19、disks or plates3.2 mm in thickness.7.1.8 Arc ResistanceTest Method D495, using tungstenrod 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 transportat
20、ionat the lowest rate to the point of delivery.8.2 Package MarkingShipping containers shall be markedwith the name of the compound, type, color, and the quantitycontained therein, as defined by the contract or order underwhich shipment is made, the name of the manufacturer, and thenumber of the cont
21、ract or order.8.3 All packing, packaging, and marking provisions ofPractice D3892 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 t
22、he last issue,D705 99(2004), that may impact the use of this standard. (December 1, 2012)(1) Five year review. Reapproval without change.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this sta
23、ndard 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 be reviewed every five years an
24、dif 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 theresponsible technical committee,
25、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, West Conshohocken, PA 19428-295
26、9,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
27、 may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Detail 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, h
28、owever, since Type 1 has unlimited colorpossibilities, while Type 2 is limited to 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 .D705 99 (2012)2
