1、Designation:D108200(Reapproved 2011)Standard Test Method forDissipation Factor and Permittivity(Dielectric Constant)ofMica1This standard is issued under the fixed designation D1082;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the
2、year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the dissi-pation factor and the relative permittivity of natural block
3、 micahaving thicknesses between 0.007 and 0.030 in.(0.18 and 0.77mm)and mica films or capacitor splits between 0.0008 and0.004 in.(0.02 and 0.10 mm)in thickness.1.2 The values stated in inch-pound units are to be regardedas the standard.The values in parentheses are for informationpurposes only.1.3
4、This standard does not purport to address all of thesafety problems,if any,associated with its use.It is theresponsibility 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.A specific warningstat
5、ement is given in Section 7 and 6.1.1.NOTE1Procedures for the measurement of dissipation factor andpermittivity are given in IEC Publication 60371-2,but the details of theprocedure are somewhat different from those specified in this test method.2.Referenced Documents2.1 ASTM Standards:2D150 Test Met
6、hods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD374 Test Methods for Thickness of Solid Electrical Insu-lation(Withdrawn 2013)3D748 Specification for Natural Block Mica and Mica FilmsSuitable for Use in Fixed Mica-Dielectric Capacitors2.2 IEC Pub
7、lication:Publication 60371-2 Specification for insulating materialsbased on micaPart 2:Methods of test43.Summary of Test Method3.1 Any of the techniques and apparatus set forth in TestMethods D150 may be used for measuring dissipation factorand relative permittivity of block mica or film.Select anap
8、propriate electrode system from those given in Section 5.3.2 If a relative order of magnitude of dissipation factor isdesired,the use of Method A in the Appendix of SpecificationD748 is satisfactory.4.Significance and Use4.1 The dissipation factor of natural muscovite mica,asdetermined by this test
9、method,is of practical importance as ameasure of the electrical energy lost as heat in the mica servingas the dielectric substance of capacitors,or in other applica-tions in which the electric field is applied perpendicular to theplane of cleavage.The dissipation factor is particularly impor-tant in
10、 applications using mica at radio frequencies and in someless extensive audio frequency applications.This test method issuitable for specification acceptance and dielectric-loss controltests(see the Significance and Use of Test Methods D150).4.2 Relative Permittivity(Dielectric Constant)The per-mitt
11、ivity of natural muscovite mica is a measure of its relativeability to store electrostatic energy.Since the relative permit-tivity perpendicular to the cleavage plane is fairly uniform,regardless of origin,its practical significance is mainly foridentification purposes,special uses,research,and desi
12、gn.If aloss index is desired,the value of the permittivity must beknown(see the Significance and Use of Test Methods D150).5.Apparatus5.1 For a general description of apparatus suitable formeasuring dissipation factor and relative permittivity,refer toTest Methods D150.1This test method is under the
13、 jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materialsand is the direct responsibility ofSubcommittee D09.19 on Dielectric Sheet and Roll Products.Current edition approved April 1,2011.Published April 2011.Originallyapproved in 1949.Last previous edition approved in 200
14、5 as D1082 00(2005).DOI:10.1520/D1082-00R11.2For 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 standards Document Summary page onthe ASTM website.3The last approved ver
15、sion of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Select a suitable elec
16、trode arrangement from the follow-ing:5.2.1 Steel ElectrodesThree electrodes made of stainlesssteel or nickel-plated tool steel will be required.The electrodesshall be cylindrical in shape and of a diameter sufficient toprovide the minimum specified capacitance(Note 2).Theupper and lower electrodes shall have a minimum axial lengthof12in.(12.7 mm)and the center electrode shall have amaximum length of14in.(6.35 mm).A low-resistance contactand conductor to the electrode is essential for dissipatio