ASTM_D_1677_-_02_2011.pdf

Designation:D167702(Reapproved 2011)Standard Methods forSampling and Testing Untreated Mica Paper Used forElectrical Insulation1This standard is issued under the fixed designation D1677;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the 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 These methods cover procedures for sampling andtesting untreated mica paper to be used as an electricalinsulator or as a constituent of a composite material used forelectrical insulating purposes.1.2 The procedures2appear in the following order:ASTMMethodProceduresSectionsReferencesApparent Density12.Aqueous Extract Conductivity32 and 33D202Conditioning4D685Dielectric Strength16 19D149Impregnation Time20 24D202Moisture Content26 28D644Roll Quality25.Sampling3.Tensile Strength13 15D828Thickness6 10D374Weight11D646Weight Variability29 31.1.3 The values stated in inch-pound units are to be regardedas the standard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD202 Test Methods for Sampling and Testing UntreatedPaper Used for Electrical InsulationD374 Test Methods for Thickness of Solid Electrical Insu-lation(Withdrawn 2013)4D644 Test Method for Moisture Content of Paper andPaperboard by Oven Drying(Withdrawn 2010)4D646 Test Method for Mass Per Unit Area of Paper andPaperboard of Aramid Papers(Basis Weight)D685 Practice for Conditioning Paper and Paper Productsfor TestingD828 Test Method for Tensile Properties of Paper andPaperboard Using Constant-Rate-of-ElongationApparatus(Withdrawn 2009)4D1711 Terminology Relating to Electrical Insulation3.Sampling3.1 Sample in accordance with the requirements set forth inTest Methods D202.3.2 Make the tests for physical properties on each sampleinsofar as the specimens are of sufficient width.3.3 Untreated mica papers are,in general,quite fragile andfriable.At all times during the operations of sampling,conditioning,specimen preparation,and testing,great caremust be taken to prevent flexing and tearing,and to minimizeabrasion of particles from the surfaces.The test values may besignificantly and adversely affected if these precautions are nottaken.4.Conditioning4.1 Condition samples in accordance with Practice D685,except that samples should remain in the conditioned air for notless than 16 h prior to the tests.4.2 The following physical tests shall be made in theconditioned atmosphere:thickness,weight,tensile strength,dielectric strength,and impregnation.5.Precision and Bias5.1 Due to the range of types and grades,and nonuniformnature of commercially available mica papers,no statement1These methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.19 on Dielectric Sheet and Roll Products.Current edition approved April 1,2011.Published April 2011.Originallyapproved in 1959.Last previous edition approved in 2007 as D1677 02(2007).DOI:10.1520/D1677-02R11.2The test methods for other properties will be added in accordance with standardASTM procedures as their need becomes generally desirable.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 can be made about the precision of these methods when usedon these materials.Neither can a statement about bias be madebecause of the unavailability of standard reference materials.Nevertheless,these methods serve to distinguish basic,relativedifferences in properties,and variations in quality among micapapers used in electrical insulation.THICKNESS AND THICKNESS VARIATION6.Terminology Definition6.1 thickness,nof an electrical insulating material,theperpendicular distance between the two surfaces of interest,determined in accordance with a standard method.7.Significance and Use7.1 Accurate determination of thickness is important foridentification purposes.Thickness is related to weight and mustbe known in order to calculate apparent density and thedielectric strength.7.2 Thickness variation affects the quality of roll windingand is useful in judging the uniformity of