1、Designation: D3955 13Standard 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 revision, the year of last revision. A number in parent
2、heses 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 tests and values for elec-trical insulating varnishes, as supplied, which are suitable forthe impregnation and treatment
3、 of electrical coils and windingsapplied by dip process.1.2 Varnishes, flexible or rigid, included in this specificationare:Grade DAAir-dryGrade DOOrganic solvent containing, baking,Grade DMReactive diluent containing,Grade DSSilicone,Grade DWWater containing, andGrade DTThixotropic.1.3 The values s
4、tated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.NOTE 1This specification resembles IEC 60455 in title only. Thecontent is significantly different.2.
5、Referenced Documents2.1 ASTM Standards:2D93 Test Methods for Flash Point by Pensky-MartensClosed Cup TesterD115 Test Methods for Testing Solvent Containing Var-nishes Used for Electrical InsulationD1711 Terminology Relating to Electrical InsulationD2519 Test Method for Bond Strength of Electrical In
6、sulat-ing Varnishes by the Helical Coil TestD3056 Test Method for Gel Time of Solventless VarnishesD3145 Test Method for Thermal Endurance of ElectricalInsulating Varnishes by the Helical Coil MethodD3251 Test Method for Thermal Endurance Characteristicsof Electrical Insulating Varnishes Applied Ove
7、r Film-Insulated Magnet WireD3278 Test Methods for Flash Point of Liquids by SmallScale Closed-Cup ApparatusD4733 Test Methods for Solventless Electrical InsulatingVarnishesD4880 Test Method for Salt Water Proofness of InsulatingVarnishes Over Enamelled Magnet WireD5637 Test Method for Moisture Resi
8、stance of ElectricalInsulating VarnishesD5638 Test Method for Chemical Resistance of ElectricalInsulating Varnishes2.2 Military Specifications:3MIL-PRF-17672 Hydraulic Fluid, Petroleum, InhibitedMIL-PRF-17331 Lubricating Oil, Synthetic Base P-D-680,Dry Cleaning SolventMIL-D-16791 Detergent, General
9、Purpose, (Liquid, Non-Ionic)2.3 Other Standards:3NEMA MW1000 Magnet WireIEC 60455 Resin Based Reactive Compounds Used forElectrical Insulation3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication refer to Terminology D1711.4. Flexible or Rigid Classification4.1 This speci
10、fication covers both flexible and rigid, solvent(including water) and solventless insulating varnishes.5. Thermal Classification5.1 The thermal classification of insulating varnishes cov-ered by this specification is determined by using Test MethodsD3145 and D3251 in conjunction with 18 AWG magnet w
11、ireconforming to MW 35-C and MW 16-C in accordance withNEMA MW1000. Determine the temperature index at 20 000h.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01 on Electrical Ins
12、ulating Varnishes, Powders and Encapsulat-ing Compounds.Current edition approved April 1, 2013. Published April 2013. Originallyapproved in 1980. Last previous edition approved in 2009 as D395504 (2009).DOI: 10.1520/D3955-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcon
13、tact 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 Global Engineering Documents, 15 Inverness Way, EastEnglewood, CO 80112-5704, http:/.*A Summary of Changes section appea
14、rs at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 The thermal class is determined from the temperatureindex range as follows:Thermal Class Temperature Index Range130 130.0 to 154.9155 155.0 to 179.9180
15、180.0 to 199.9200 200.0 to 219.9220 220.0 and above6. General Specifications and Qualification Requirements6.1 All varnishes supplied under this specification mustconform to the limits outlined in Table 1, and must meet, orexceed, all specification requirements.6.2 A varnish supplied under this spec
16、ification is to bemanufactured from one specific formula and one specificprocess at one or more plants of the same company.6.3 Changes involved solely with percent nonvolatile con-tent or compatible solvent system, do not requirerequalification, if agreed upon between supplier and user.6.4 If any fo
17、rmula or process changes are desired afterqualification approval has been granted, conduct the tests inTable 1, except for thermal class.6.5 If varnishes from different suppliers are to be mixed orused in a common tank or container, determine their compat-ibility by Test Methods D115. They must be c
18、ompatible, bothin the liquid and solid state, with the varnish currently beingused in the system.6.6 Varnishes containing silicone in any portion, must notbe mixed with non-silicone varnishes.6.7 The qualification requirements of the varnish shall be asmutually agreed upon between supplier and user,
19、 with tests tobe performed in accordance with the appropriate methods, andlimits as shown in Table 1.6.8 Preconditioning: Grade DA Varnishes OnlyPrecondition all Grade DA varnish specimens, both flexibleand rigid, in air at room temperature for seven days prior tocarrying out dielectric strength and
20、 bond strength tests shownin Table 1.7. Hazards7.1 It is unsafe to use varnish at temperatures above theflash point without adequate ventilation, especially if thepossibility exists that flames or sparks are present. Storevarnish in sealed containers.8. Sampling8.1 Obtain varnish samples and appropr
21、iate thinner eitherfrom the manufacturer or directly from shipping containerssupplied from the manufacturer. It is also acceptable to obtainsuitable samples from material in process. It is important thatnew, or thoroughly cleaned sampling containers be used. It isacceptable to obtain suitable sample
22、s by any of a number ofprocedures commonly used in the industry. Normally, thesample is simply poured from the shipping container. Thesample container shall have a tight fitting cover to minimize theloss of solvents. A dipping ladle is an acceptable choice, or, ifit is desirable to obtain a sample f
23、rom various levels, useappropriate sampling techniques.8.2 The quantity of sample is that required as indicated in9.1.9. Quality Conformance Tests9.1 General RequirementsFrom each batch of varnish,take a 2-qt (2-L) sample and test. The values must meet thelimits listed for specification requirements
24、 shown in Table 1,oras agreed upon between supplier and user.9.2 Inspection and Preparation for DeliverySelectsamples and inspect to verify conformance with the require-ments in Section 6.10. Keywords10.1 varnish, air-dry; varnish, electrical; varnish, silicone;varnish, solvent containing; varnish,
25、thixotropic; varnish, watercontainingD3955 132TABLE 1 Specification RequirementsGradeASTMTest 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-C
26、D3251 and D3145 Class 155 for both wire types and both test methods180 MW 35-C 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 bot
27、h wire types and both test methodsDielectric strength, V/mil, min, onmetal panelsD115/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 (
28、minimum pounds)over 18 AWGMW 16-C or MW 35-CD2519Flexible at 77F/300F (25C/150C)5/0 10/1 10/1 6/0.5 20/1 15/2Rigid at 77F/300F (25C/150C)NAA20/3 25/4 NA 25/3 30/5Salt water proofness D4880over MW 35-C or MW 16-C 100B100B100B100B100B100BMoisture resistance D5637percent retained, min 50 50 50 50 50 50
29、Chemical resistance D5638minimum percent retained after 168 h at 73F (23C)Hydraulic fluidC50 50 50 50 50 50Lubricating oilD50 50 50 50 50 50Cleaning fluidE50 50 50 50 50 50Distilled water 50 50 50 50 50 50Detergent solutionF50 50 50 50 50 50Storage life, months minG12126666Viscosity (cps at 77F (25C
30、) D115/D4733 801200 1001200 1001300 80240 1001300 15 000H5000IThixotropic 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.
31、3 0.5 0.8 1.1Flash point (F (C), min) D93/D3278 73 (23)J73 (23)J200 (93)J73 (23)J194 (90)J200 (93)JDrying time (h at F (C) max D115 3at230 (110)2at300 (150)NA 6 at390 (200)2at300 (150)NAVariation in gel time (% of reportedvalue)D3056 NA NA 10.0 NA NA 10.0ANot applicable.BPassing is defined as 7 of 9
32、 specimens still passing at specified time.CIn accordance with MIL-PRF-17672.DIn accordance with MIL-PRF-17331.EIn accordance with P-D-6801,1,2-trichloro 1,2,2-trifluoroethane.FDetergent per MIL-D-16791, non-ionic detergent (1 lb per 214 gal water).GAs warranted by the manufacturer.HMaximum at 2 r/m
33、in.IMaximum at 20 r/min.JOr as agreed to by supplier and user.D3955 133SUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this specification since the last issue,D395504(2009), that may impact the use of this specification. (Approved April 1, 2013)(1) Changes made in
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37、mittee 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 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:/ 134
