1、Designation: D5638 05 (Reapproved 2010)D5638 14Standard Test Method forChemical Resistance of Electrical Insulating Varnishes1This standard is issued under the fixed designation D5638; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, 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 test method covers the mechanical performance of insulating varnishes after exposure to vari
3、ous chemicals.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 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
4、to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. See 7.1.NOTE 1There is no IEC/ISO equivalent.2. Referenced Documents2.1 ASTM Standards:2D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Co
5、il Test3. Terminology3.1 See Test Method D2519.4. Summary of Test Method4.1 Flexural strength tests are made on varnish-treated helical coils to determine the force required to break the coil underspecified conditions both before and after exposure to liquid chemicals.5. Significance and Use5.1 This
6、 test method is useful for the evaluation of insulating varnish performance in chemical exposure.6. Apparatus6.1 Tensile Testing MachineSee Test Method D2519.6.2 Test FixtureSee Test Method D2519.6.3 Chemical ContainersSealable 1000 mL 1000-mL containers of suitable material and design for containin
7、g the chemicalsto be used.7. Safety Precautions7.1 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. Test Specimen8.1 Prepare a minimum of five t
8、est specimens for each chemical solution to be tested and a minimum of five to determineunconditioned bond strength in accordance with Test Method D2519 using a wire mutually agreed upon by supplier and user.1 This test method is under the jurisdiction of ASTM Committee D09 on Electrical and Electro
9、nic Insulating Materials and is the direct responsibility of SubcommitteeD09.01 on Electrical Insulating Varnishes, Powders and Encapsulating Compounds.Current edition approved May 1, 2010Nov. 1, 2014. Published September 2010November 2014. Originally approved in 1994. Last previous edition approved
10、 in 2005 2010as D5638D5638 05 (2010).05. DOI: 10.1520/D5638-05R10. 10.1520/D5638-14.2 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
11、ge 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 adequately depict all changes accurately, ASTM recommends that
12、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 International, 100 Barr Harbor Drive, PO Box C700, West Con
13、shohocken, PA 19428-2959. United States19. Procedure9.1 Condition a minimum of five test specimens in each chemical. Chemicals, test temperature, and conditioning time aremutually agreed upon by supplier and user.9.2 Test specimens both conditioned and unconditioned as described in Test Method D2519
14、 at standard laboratory conditions.Test conditioned specimens within 15 min of removal from container to minimize any change in bond strength after exposure.Rinse conditioned specimens with water and pat dry when water soluble chemicals were used for conditioning. Otherwise wipespecimens to remove e
15、xcess chemical.10. Report10.1 Report the following information:10.1.1 Description of varnish,10.1.2 Identification of wire used,10.1.3 Cure time and temperature and number of dips used to prepare the coils,10.1.4 Average bond strength in newtons (pounds-force) of unconditioned coils,10.1.5 Average b
16、ond strength in newtons (pounds-force) of conditioned coils,10.1.6 Description of chemical, exposure temperature, and exposure time to which the specimens were subjected, and10.1.7 Percent retention of bond strength after conditioning per the formula below.Percent Retained Bond Strength5 Average Bon
17、d Strength fconditionedgAverage Bond Strength funconditionedg 3100%Retained Bond Strength5 Average Bond Strength fconditionedgAverage Bond Strength funconditionedg 310011. Precision and Bias11.1 PrecisionNo information has been presented toASTM upon which to base a statement of precision. No activit
18、y has beenplanned to develop such information.11.2 BiasThis test method has no bias because the value for chemical resistance is determined solely in terms of this testmethod.12. Keywords12.1 bond strength; chemical resistance; helical coils; varnishSUMMARY OF CHANGESCommittee D09 has identified the
19、 location of selected changes to this standard since the last issue (D5638 05(2010) that may impact the use of this standard. (Approved Nov. 1, 2014.)(1) Revised Subsection 8.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item ment
20、ionedin 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 responsible technical committee
21、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 careful consideration at a meeting
22、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 International, 100 Barr Harbor Drive, PO Bo
23、x 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:/ 142
