1、Designation: D3955 04 (Reapproved 2009)D3955 13 An American National StandardStandard Specification forElectrical Insulating Varnishes1This standard is issued under the fixed designation D3955; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 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 Scope*1.1 This specification covers the tests and values for electrical insulating varnishes, as s
3、upplied, which are suitable for theimpregnation and treatment of electrical coils and windings applied by dip process.1.2 Varnishes, flexible or rigid, included in this specification are:Grade DAAir-dryGrade DOOrganic solvent containing, baking,Grade DMReactive diluent containing,Grade DSSilicone,Gr
4、ade DWWater containing, andGrade DTThixotropic.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.NOTE 1This specification resembles I
5、EC 60455 in title only. The content is significantly different.2. Referenced Documents2.1 ASTM Standards:2D93 Test Methods for Flash Point by Pensky-Martens Closed Cup TesterD115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical InsulationD1711 Terminology Relating to Electri
6、cal InsulationD2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil TestD3056 Test Method for Gel Time of Solventless VarnishesD3145 Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil MethodD3251 Test Method for Thermal Endur
7、ance Characteristics of Electrical Insulating Varnishes Applied Over Film-InsulatedMagnet WireD3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup ApparatusD4733 Test Methods for Solventless Electrical Insulating VarnishesD4880 Test Method for Salt Water Proofness of Insulating Va
8、rnishes Over Enamelled Magnet WireD5637 Test Method for Moisture Resistance of Electrical Insulating VarnishesD5638 Test Method for Chemical Resistance of Electrical Insulating Varnishes2.2 Military Specifications:3MIL-PRF-17672 Hydraulic Fluid, Petroleum, InhibitedMIL-PRF-17331 Lubricating Oil, Syn
9、thetic Base P-D-680, Dry Cleaning SolventMIL-D-16791 Detergent, General Purpose, (Liquid, Non-Ionic)2.3 Other Standards:3NEMA MW1000 Magnet WireIEC 60455 Resin Based Reactive Compounds Used for Electrical Insulation1 This specification is under the jurisdiction of ASTM Committee D09 on Electrical an
10、d Electronic Insulating Materials and is the direct responsibility of SubcommitteeD09.01 on Electrical Insulating Varnishes, Powders and Encapsulating Compounds.Current edition approved Oct. 1, 2009April 1, 2013. Published February 2010April 2013. Originally approved in 1980. Last previous edition a
11、pproved in 20042009 asD395504. 04 (2009). DOI: 10.1520/D3955-04R09.10.1520/D3955-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary pa
12、ge on the ASTM website.3 Available from Global Engineering Documents, 15 Inverness Way, East Englewood, CO 80112-5704, http:/.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. Becau
13、seit may not be technically possible to adequately 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 appear
14、s at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 DefinitionsFor definitions of terms used in this specification refer to Terminology D1711.4. Flexible or Rigid Classification4.1 This speci
15、fication covers both flexible and rigid, solvent (including water) and solventless insulating varnishes.5. Thermal Classification5.1 The thermal classification of insulating varnishes covered by this specification is determined by using Test Methods D3145and D3251 in conjunction with 18 AWG magnet w
16、ire conforming to MW 35-C and MW 16-C in accordance with NEMAMW1000. Determine the temperature index at 20 000 h.5.2 The thermal class is determined from the temperature index range as follows:Thermal Class Temperature Index Range130 130.0 to 154.9155 155.0 to 179.9180 180.0 to 199.9200 200.0 to 219
17、.9220 220.0 and above6. General Specifications and Qualification Requirements6.1 All varnishes supplied under this specification must conform to the limits outlined in Table 1, and must meet, or exceed,D3955 132all specification requirements.6.2 A varnish supplied under this specification is to be m
18、anufactured from one specific formula and one specific process at oneor more plants of the same company.6.3 Changes involved solely with percent nonvolatile content or compatible solvent system, do not require requalification, ifagreed upon between supplier and user.TABLE 1 Specification Requirement
19、sGradeASTMTest MethodMinimum Thermal ClassClassType of MagnetWire Overwhich Varnish isAppliedDA DO DM DS DW DT130 MW 35-C andMW 16-CD3251 and D3145 Class 130 for both wire types and both test methods155 MW 35-C andMW 16-CD3251 and D3145 Class 155 for both wire types and both test methods180 MW 35-C
20、andMW 16-CD3251 and D3145 Class 180 for both wire types and both test methods200 MW 35-C andMW 16-CD3251 and D3145 Class 200 for both wire types and both test methods220 MW 35-C andMW 16-CD3251 and D3145 Class 220 for both wire types and both test methodsDielectric strength, V/mil, min, onmetal pane
21、lsD115/D4733Conditioned 24 h at 23Cand 50 % RH1500 2000 1500 1800 2000 1500Conditioned 24 h at 23Cand 96 % RH975 1500 1125 1350 1500 1125Conditioned 24 h at 23Cin deionized water900 1500 1125 1350 1500 1125Bond strength (minimum pounds)over 18 AWGMW 16-C or MW 35-CD2519Flexible at 77F/300F (25C/150C
22、)5/0 10/1 10/1 6/0.5 20/1 15/2Rigid at 77F/300F (25C/150C)NAA 20/3 25/4 NA 25/3 30/5Salt water proofness D4880over MW 35-C or MW 16-C 100B 100B 100B 100B 100B 100BMoisture resistance D5637percent retained, min 50 50 50 50 50 50Chemical resistance D5638minimum percent retained after 168 h at 73F (23C
23、)Hydraulic fluidC 50 50 50 50 50 50Lubricating oilD 50 50 50 50 50 50Cleaning fluidE 50 50 50 50 50 50Distilled water 50 50 50 50 50 50Detergent solutionF 50 50 50 50 50 50Storage life, months minG 12 12 6 6 6 6Viscosity (cps at 77F (25C) D115/D4733 801200 1001200 1001300 80240 1001300 15 000H5000IT
24、hixotropic index, min D4733 NA NA NA NA NA 1.1% Nonvolatile matter, min D115 30 40 NA 40 35 NAVariation in specific gravity/density(% of reported value)D115/D4733 1.0 1.0 1.0 1.0 1.0 1.0Build as received (mils, min) D115/D4733 0.9 0.9 0.3 0.5 0.8 1.1Flash point (F (C), min) D93/D3278 73 (23)J 73 (23
25、)J 200 (93)J 73 (23)J 194 (90)J 200 (93)JDrying time (h at F (C) max D115 3 at230 (110)2 at300 (150)NA 6 at390 (200)2 at300 (150)NAVariation in gel time (% of reportedvalue)D3056 NA NA 10.0 NA NA 10.0A Not applicable.B Passing is defined as 7 of 9 specimens still passing at specified time.C In accor
26、dance with MIL-PRF-17672.D In accordance with MIL-PRF-17331.E In accordance with P-D-6801,1,2-trichloro 1,2,2-trifluoroethane.F Detergent per MIL-D-16791, non-ionic detergent (1 lb per 214 gal water).G As warranted by the manufacturer.H Maximum at 2 r/min.I Maximum at 20 r/min.J Or as agreed to by s
27、upplier and user.D3955 1336.4 If any formula or process changes are desired after qualification approval has been granted, conduct the tests in Table 1,except for thermal class.6.5 If varnishes from different suppliers are to be mixed or used in a common tank or container, determine their compatibil
28、ityby Test Methods D115. They must be compatible, both in the liquid and solid state, with the varnish currently being used in thesystem.6.6 Varnishes containing silicone in any portion, must not be mixed with non-silicone varnishes.6.7 The qualification requirements of the varnish shall be as mutua
29、lly agreed upon between supplier and user, with tests to beperformed in accordance with the appropriate methods, and limits as shown in Table 1.6.8 Preconditioning: Grade DA Varnishes OnlyPrecondition all Grade DA varnish specimens, both flexible and rigid, in airat room temperature for seven days p
30、rior to carrying out dielectric strength and bond strength tests shown in Table 1.7. Hazards7.1 It is unsafe to use varnish at temperatures above the flash point without adequate ventilation, especially if the possibilityexists that flames or sparks are present. Store varnish in sealed containers.8.
31、 Sampling8.1 Obtain varnish samples and appropriate thinner either from the manufacturer or directly from shipping containers suppliedfrom the manufacturer. Suitable samples may also be obtained It is also acceptable to obtain suitable samples from material inprocess. It is important that new, or th
32、oroughly cleaned sampling containers be used. The sample may be obtained It is acceptableto obtain suitable samples by any of a number of procedures commonly used in the industry. Normally, the sample is simply pouredfrom the shipping container. The sample container shouldshall have a tight fitting
33、cover to minimize the loss of solvents.Adippingladle may be used, is an acceptable choice, or, if it is desirable to obtain a sample from various levels, use appropriate samplingtechniques.8.2 The quantity of sample is that required as indicated in 9.1.9. Quality Conformance Tests9.1 General Require
34、mentsFrom each batch of varnish, take a 2-qt (2-L) sample and test.The values must meet the limits listedfor specification requirements shown in Table 1, or as agreed upon between supplier and user.9.2 Inspection and Preparation for DeliverySelect samples and inspect to verify conformance with the r
35、equirements inSection 6.10. Keywords10.1 varnish, air-dry; varnish, electrical; varnish, silicone; varnish, solvent containing; varnish, thixotropic; varnish, watercontainingSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this specification since the last issue,D39
36、5504(2009), that may impact the use of this specification. (Approved April 1, 2013)(1) Changes made in 8.1.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 th
37、at 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 responsible technical committee and must be reviewed every five years andif not revised, either reappr
38、oved 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 careful consideration at a meeting of theresponsible technical committee, which you may attend. If you fe
39、el 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 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual rep
40、rints (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 ASTM website (www.astm.org/COPYRIGHT/).D3955 134
