1、Designation: D 784 03An American National StandardStandard Specification forOrange Shellac and Other Indian Lacs for ElectricalInsulation1This standard is issued under the fixed designation D 784; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the requirements and methodsof test for three types and four grad
3、es of orange 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 a
4、re not covered by this specifica-tion.NOTE 1ISO Specifications 561 and 562 cover shellac. However,the equivalency of the ISO specification to this standard is unknown.Direct reference to the ISO standards may be made if it is necessary todetermine equivalency.2. Referenced Documents2.1 ASTM Standard
5、s:2D 29 Test Methods for Sampling and Testing Lac ResinsD 411 Test Methods for Shellac Used for Electrical Insula-tionD 1711 Terminology Relating to Electrical Insulation2.2 ISO Standards:561 ShellacSpecificationsPart 1: Hand-Made Shellac3562 ShellacSpecificationsPart 2: Machine-MadeShellac33. Termi
6、nology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminology D 1711.4. Ordering Information4.1 Orders 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 conta
7、iner, and4.5 Total quantity.5. Description of Materials5.1 Type I is the commercial rosin-free grade of orangeflake shellac. Type II customarily occurs in the form of circulardisks about 76 mm (3 in.) in diameter and 3 mm (18 in.) inthickness and is known to the trade as pure button lac. Type IIIis
8、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 admixture 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
9、Methods7.1 Determine the material sampled and the propertiesenumerated in this specification in accordance with TestMethods D 29 and D 411.8. Certification8.1 When specified in the purchase order or contract, aproducers or suppliers certification shall be furnished to thepurchaser that the material
10、complies with the requirements ofthis specification. A report of the test results shall be furnishedwhen specified in the purchase order or contract.9. Packaging and Package Marking9.1 Packaging and marking shall be as agreed upon betweenthe purchaser and the supplier.10. Keywords10.1 bonded mica pa
11、per; bonded mica splittings; button lac;garnet lac; lac; orange flake shellac1This 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 En
12、capsu-lating Compounds.Current edition approved Dec. 1, 2003. Published January 2004. Originallyapproved in 1961. Last previous edition approved in 1999 as D 784 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Bo
13、ok of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Association, 11 W. 42nd St., NewYork, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unit
14、ed States.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 r
15、ights, 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 andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for addition
16、al standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the AS
17、TM 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 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the abo
18、veaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Requirements for Orange Shellac and Other LacsType IType II Type IIIGrade A Grade B Grade C Grade DMatter insoluble in specified hot solvents, max, % 1.00 1.25 1.5
19、0 3.00 1.00 0.50Iodine number, max 15.0 15.0 15.0 15.0 15.0 18.0Moisture, max, % 2.0 2.0 2.0 2.0 2.0 2.0Wax, max, % 5.5 5.5 5.5 5.5 5.5 3.5Orpiment, max, % (native arsenic trisulfide) 0.03 0.03 0.03 0.2 0.03 0.03Matter soluble in water, max, % 0.5 0.5 0.5 0.5 0.5 0.5Ash, max, %Rosin1.0none1.0none1.0
20、none1.0none0.5none0.5.Color when specified, the color shall be no darker than that of a sample agreed upon by thepurchaser and the sellerAPolymerization time at 150 61C when specified, shall be within the maximum-minimum range agreed upon by thepurchaser and the sellerFlow test at 100 61C when speci
21、fied, shall be within the maximum-minimum range agreed upon by thepurchaser and the sellerAAAttention is called to the fact that the purchaser and the seller must agree upon one of the two methods for determining (1) color for Type 1, appearing in Test MethodsD 29 and (2) flow test in Test Methods D 411.D784032
