1、Designation: D115 07 (Reapproved 2012)D115 14Standard Test Methods for TestingSolvent Containing Varnishes Used for Electrical Insulation1This standard is issued under the fixed designation D115; 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 These test methods cover tests for solvent containing varnishes primarily intended to provid
3、e electrical, mechanical, andchemical protection for electrical equipment. These test methods include tests for control and performance as follows:Procedure SectionBuild 37 41Build 38 42Dielectric Strength 42 47Dielectric Strength 43 48Drainage 25 31Drainage 26 32Flash Point 17 19Flash Point 18 20No
4、nvolatile Matter 20 24Nonvolatile Matter 21 25Oil Resistance 53 55Oil Resistance 54 56Preparation of Test Specimens 7Preparation of Test Specimens 7Specific Gravity 9 12Temperature Index 48-49Temperature Index 49 50Time of Drying 32 36Time of Drying 33 37Varnish Compatibility 50 52Varnish Compatibil
5、ity 51 53Viscosity 13 16Viscosity 13 171.2 Where the entire test method is included in this standard, the precision and bias are not known unless given in the statedmethod.1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1
6、.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. For specific haza
7、rd statements, see Section 5.NOTE 1There is no equivalent IEC standard.2. Referenced Documents2.1 ASTM Standards:2D56 Test Method for Flash Point by Tag Closed Cup TesterD93 Test Methods for Flash Point by Pensky-Martens Closed Cup TesterD149 Test Method for Dielectric Breakdown Voltage and Dielectr
8、ic Strength of Solid Electrical Insulating Materials atCommercial Power FrequenciesD202 Test Methods for Sampling and Testing Untreated Paper Used for Electrical InsulationD287 Test Method for API Gravity of Crude Petroleum and Petroleum Products (Hydrometer Method)1 These test methods are under the
9、 jurisdiction ofASTM Committee D09 on Electrical and Electronic Insulating Materials and are the direct responsibility of SubcommitteeD09.01 on Electrical Insulating Varnishes, Powders and Encapsulating Compounds.Current edition approved April 1, 2012Nov. 1, 2014. Published April 2012November 2014.
10、Originally approved in 1941. Last previous edition approved in 20072012 asD115 07.D115 07 (2012). DOI: 10.1520/D0115-07R12.10.1520/D0115-14.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume
11、 information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequat
12、ely depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM Int
13、ernational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D295 Test Methods for Varnished Cotton Fabrics Used for Electrical InsulationD374 Test Methods for Thickness of Solid Electrical Insulation (Withdrawn 2013)3D580 Specification for Greige Woven Glass Tapes
14、 and WebbingsD1475 Test Method For Density of Liquid Coatings, Inks, and Related ProductsD1638 Method of Testing Urethane Foam Isocyanate Raw MaterialsD1932 Test Method for Thermal Endurance of Flexible Electrical Insulating VarnishesD2518 Specification for Woven Glass Fabrics for Electrical Insulat
15、ion (Withdrawn 2013)3D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil TestD3145 Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil MethodD3251 Test Method for Thermal Endurance Characteristics of Electrical Insulating Va
16、rnishes Applied Over Film-InsulatedMagnet WireD3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup ApparatusD3487 Specification for Mineral Insulating Oil Used in Electrical ApparatusD5032 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin SolutionsD5
17、423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical InsulationE104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions3. Terminology3.1 Definitions:3.1.1 dielectric strengthstrength, nthe voltage gradient at which dielectric failure of
18、the insulating material occurs underspecific conditions of test.3.1.2 drainagedrainage, nof an insulating varnish, a measure of the variation in thickness from top to bottom of a varnishfilm obtained on the surface of a vertically dip coated dip-coated panel after a specified time and temperature.3.
19、1.3 flash pointpoint, nthe lowest temperature of the specimen, corrected to a pressure of 760 mm Hg (101.3 kPa), at whichapplication of an ignition source causes any vapor from the specimen to ignite under specified conditions of test.3.1.4 nonvolatile mattermatter, nin insulating varnish, that port
20、ion of a varnish which is not volatilized when exposed tospecified conditions; the value obtained is not necessarily equal to the calculated solids incorporated during compounding.3.1.4.1 DiscussionFor example, the theoretical chemical solids are often assumed to be the solid phase materials incorpo
21、rated in the varnish at thetime of compounding. Many of these solid phase intermediate materials will lose volatile fractions due to the specified conditionsof the nonvolatile matter procedure. An example is phenolic resin.3.1.5 oil resistanceresistance, nof insulating varnish, a measure of the rete
22、ntion of properties after exposure to a specifiedoil under specified conditions of test.3.1.6 time of dryingdrying, nof insulating varnish, the time required for a film of varnish to dry to a tackfree state underspecified conditions.3.2 Definitions of Terms Specific to This Standard:3.2.1 build, nof
23、 an insulating varnish on copper, the average thickness of varnish film on one side of a copper panel that hasreceived a single coat of the varnish applied and measured under specified conditions.3.2.2 build, nof an insulating varnish on glass cloth, the average overall thickness of strips of glass
24、cloth that have receivedtwo dips of the varnish applied and measured under specified conditions.3.2.3 tack free, tack-free, adjcondition when a varnish has reached the point that the surface can be touched lightly withouta sensation of stickiness.3.2.4 varnish, air-drying, na liquid resin system tha
25、t forms a dry, tack free tack-free coating, without the application of heat,either through evaporation of solvent or by reaction with atmospheric oxygen.3.2.5 varnish, baking, na liquid resin system that forms a dry, tack free tack-free coating when exposed to elevatedtemperatures.4. Significance an
26、d Use4.1 ControlThe following tests are useful for control purposes during the manufacture and use of varnishes, and fordetermining the uniformity of batches:4.1.1 Specific gravity,3 The last approved version of this historical standard is referenced on www.astm.org.D115 1424.1.2 Viscosity,4.1.3 Fla
27、sh point, and4.1.4 Nonvolatile matter by weight.4.2 PerformanceThe following tests are useful for determining the performance of varnishes during application and use:4.2.1 Drainage,4.2.2 Time of drying,4.2.3 Build,4.2.4 Dielectric strength,4.2.5 Thermal endurance,4.2.6 Varnish compatibility,4.2.7 Sa
28、lt water proofness, and4.2.8 Oil resistance.5. Hazards5.1 WarningDo not use varnish at temperatures above the flash point when inadequate ventilation,ventilation and thepossibility of flames or sparks exist. Store varnish in sealed containers. The precautions shall also apply to the handling of ther
29、eagents and solvents called for herein.6. Sampling6.1 For all tests the sample shall be taken from a representative lot of the varnish under study. To avoid skin formation andescape of solvents, protect the sample by keeping it at room temperature in a nearly filled, tightly sealed container.7. Prep
30、aration of Test Specimens7.1 Selection of SubstrateThe selection of the substrate is determined in part by application and in part by thermal class. Twotypes of substrates may be used: copper strip or glass cloth. Copper strip is generally not used for applications over 180C(356F)(356F), due to oxid
31、ation.7.2 Copper Base: Base7.2.1 For tests that are to be performed upon the varnish as a film on a copper base, copper strips 38 mm (112 in.) in width,200 mm (8 in.) in length, and 0.127 6 0.08 mm (0.005 6 0.0003 in.) in thickness shall be used, unless otherwise specified.Measure the thickness of t
32、hese strips to the nearest 0.002 mm (0.0001 in.). Clean the strips with a suitable solvent (Note 2), thenpolish thoroughly with No. 000 steel wool. Wipe the strips free of any fingerprints or metal particles with the solvent and a lint-freecloth. If the strips are not to be used immediately, they sh
33、ould be kept stored in a noncorrosive varnish solvent.NOTE 2Xylene and denatured alcohol (1:1) have been found to be suitable cleaning solvents. V.M. dielectric strength; drainage; flash point; nonvolatile matter; oil resistance; solvent varnish; specific gravity;temperature index; time of drying; v
34、arnish; varnish compatibility; viscositySUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to these test methods this standard since the lastissue, issue (D115 02D115 07 (2012),) that may impact the use of these test methods. (Approvedthisstandard. (November 1, May 1, 20
35、07)2014.)(1) Added new 3.2.3 and renumbered subsequent paragraphs.(1) Removed references to withdrawn Methods D1638.(2) Revised Section 14.(3) Added Section 15.(4) Revised Sections 16 and 17.(1) Revised 14.1.ASTM International takes no position respecting the validity of any patent rights asserted i
36、n 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 r
37、esponsible 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 additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive care
38、ful 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 ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Internationa
39、l, 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 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1412
