1、Designation:D78408AnAmerican National StandardStandard Specification forOrange Shellac and Other Indian Lacs for ElectricalInsulation1This standard is issued under the fixed designation D784;the number immediately following the designation indicates the year oforiginal adoption or,in the case of rev
2、ision,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.Scope*1.1 This specification covers the requirements and methodsof test for three types and four grades of orange
3、shellac andother lacs,typically used as bonding agents for mica splittingsand reconstituted mica paper and as coating for other materials,as follows:1.1.1 Type IOrange Flake Shellac,Grades A,B,C,and D,1.1.2 Type IIButton Lac,and1.1.3 Type IIIGarnet Lac.1.2 Stick-lac and seed-lac are not covered by t
4、his specifica-tion.NOTE1ISO Specifications 561 and 562 cover shellac.However,theequivalency of the ISO specification to this standard is unknown.Referdirectly to the ISO standards to determine equivalency.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses
5、 are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.2.Referenced Documents2.1 ASTM Standards:2D29 Test Methods for Sampling and Testing Lac Resins(Withdrawn 2005)3D411 Test Methods for Shellac Used for Electrical Insula-tionD1711 T
6、erminology Relating to Electrical Insulation2.2 ISO Standards:561 ShellacSpecificationsPart 1:Hand-Made Shellac4562 ShellacSpecificationsPart 2:Machine-Made Shel-lac43.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1711.4.Ordering Information4.1 Or
7、ders for material covered by this specification shallinclude the following:4.2 Lot number and suppliers designation,4.3 Type and grade,4.4 Quantity in each bag or container,and4.5 Total quantity.5.Description of Materials5.1 Type I is the commercial rosin-free grade of orangeflake shellac.Type II cu
8、stomarily occurs in the form of circulardisks about 76 mm(3 in.)in diameter and 3 mm(18in.)inthickness and is known to the trade as pure button lac.Type IIIis dark garnet in color and is known to the trade as pure garnetlac.Garnet lac is manufactured in admixture with rosin and asa dewaxed lac.The a
9、dmixture and dewaxed lac are not coveredby this specification.6.Properties6.1 The material shall conform to the requirements pre-scribed in Table 1.7.Test Methods7.1 Determine the material sampled and the propertiesenumerated in this specification in accordance with TestMethods D29 and D411.8.Certif
10、ication8.1 When specified in the purchase order or contract,aproducers or suppliers certification shall be furnished to thepurchaser that the material complies with the requirements ofthis specification.A report of the test results shall be furnishedwhen specified in the purchase order or contract.1
11、This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01 on Electrical Insulating Varnishes,Powders and Encapsulat-ing Compounds.Current edition approved May 1,2008.Published June 2008.O
12、riginallyapproved in 1961.Last previous edition approved in 2003 as D784 03.DOI:10.1520/D0784-08.2For 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 S
13、ummary page onthe ASTM website.3The last approved version 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,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standar
14、dCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesNOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information19.Packaging and Package Marking9.
15、1 Packaging and marking shall be as agreed upon betweenthe purchaser and the supplier.10.Keywords10.1 bonded mica paper;bonded mica splittings;button lac;garnet lac;lac;orange flake shellacSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this specification since the
16、 last issue,D784 03,that may impact the use of this specification.(Approved May 1,2008)(1)Revised Note 1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin 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 respons
