1、Designation:D213197(Reapproved 2008)1Standard Classification forNatural Muscovite Mica Splittings1This standard is issued under the fixed designation D2131;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A n
2、umber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the determination of muscovitemica splittings of standard commercial grades and specifies themaximum allowable phy
3、sical defects for each grade.It isapplicable to commercially available natural muscovite micasplittings regardless of the basic color of the mica or its source.1.2 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.1.3 This
4、 standard is very similar to ISO 6386.It is expectedthat materials would be classified identically using the criteriaof either standard.The grades shown under“ASTM GradeNo.”in Table 1 and Table 2 are shown under“Old Grade No.”in ISO 6386-1981.2.Referenced Documents2.1 ASTM Standards:2D351 Classifica
5、tion for Natural Muscovite Block Mica andThins Based on Visual QualityD1711 Terminology Relating to Electrical Insulation2.2 ISO Publications:ISO 6386-1981 Muscovite Mica SplittingsGrading andVisual Classification33.Terminology3.1 For definitions relating to mica and for terms applicableto this stan
6、dard,refer to Terminology D1711,and Classifica-tion D351.4.Classification4.1 Mica splittings are classified by size,form,and visualquality and properties.4.2 Thirteen grades,based on size and form,are describedas given in Table 1.4.3 Within the grades,up to thirteen categories of visualquality may b
7、e separately specified,as listed in Section 6.Notall of the visual quality categories are available in all grades.5.Physical Properties5.1 Natural muscovite mica splittings shall meet the sizerequirements specified in Table 1.Classification D351,Table 1and Fig.1,define more completely the areas and
8、minimumdimensions that define the size grades,and which should beused in conjunction with Table 1 of this specification.5.2 There shall not be more than the maximum allowabletotal defects specified in Table 2 based on percentage weight.Such defects shall not lie predominantly in any one category.5.3
9、 There shall not be more of any single defect than thepercentages specified where a specific percentage is allowedfor such defect.5.4 There shall not be any foreign matter included amongthe splittings.6.Visual Quality6.1 Where specified,the visual quality shall conform to thedescription of the visua
10、l category specified,as given inClassification D351:6.1.1 V-1Clear,6.1.2 V-2Clear and Slightly Stained,6.1.3 V-3Fair Stained,6.1.4 V-4Good Stained,6.1.5 V-5Stained A Quality,6.1.6 V-5.1Stained D351 Quality,6.1.7 V-6Stained B Quality,6.1.8 V-7Heavy Stained,6.1.9 V-8Densely Stained,6.1.10 V-9Black Dot
11、ted,6.1.11 V-10Black Spotted,6.1.12 V-11Black Stained,and6.1.13 V-12Black/Red Stained6.2 Refer to Classification D351 for a complete descriptionof the visual quality categories.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is
12、 the direct responsibility ofSubcommittee D09.19 on Dielectric Sheet and Roll Products.Current edition approved May 1,2008.Published July 2008.Originally approvedin 1962.Last previous edition approved in 2003 as D2131 97(2003).DOI:10.1520/D2131-97R08E01.2For referenced ASTM standards,visit the ASTM
13、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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.
14、ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 TABLE 1 Requirements for Size and Average Thickness of SplittingsNOTE1Splittings shall not be of the minimum area specified,but shall contain a fair proportion of sizes throughout t
15、he range specified.NOTE2The areas specified do not refer to the total area of the splittings but to the usable rectangular size that each grade will produce.For example,Grade 5 splittings should be large enough to provide rectangular pieces measuring 112by 2,3 by 2,2 by 213in.,etc.ASTM GradeFormSize
16、,in.2AMinimumDimension of Us-ableRectangle,in.BThickness of 10Splittings,in.B4Bookform6 to 10,excl112(38)0.006 to0.009,inclC5Bookform3 to 6,excl1(25)0.006 to0.009,inclC512Bookform2Dto 3,excl78(22)0.006 to0.009,inclC6Bookform1 to 2,excl34(19)0.0006to0.010,inclC4Loose with powder6 to 10,excl112(38)0.006 to0.009,incl5Loose with powder3 to 6,excl1(25)0.006 to0.009,incl512Loose with powder112to 3,excl78(22)0.007 to0.010,incl6Loose with powder1 to 112,excl34(19)0.007 to0.010,incl6-1stLooseAt least 70%