1、Designation: D5638 14D5638 18Standard 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, the year of last
2、 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 This test method covers the mechanical performance of insulating varnishes after exposure to various chemicals.1.2 The va
3、lues 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 to establish appropriate
4、 safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use. See 7.1.NOTE 1There is no IEC/ISO equivalent.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestab
5、lished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D2519 Test Method for Bond Strength of Electrical Insulating Va
6、rnishes by the Helical Coil 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. Sig
7、nificance and Use5.1 This 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-mLcontainers of suitable material and desi
8、gn for containing the chemicals to 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.1 This test method is under th
9、e jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of SubcommitteeD09.01 on Electrical Insulating Varnishes, Powders and Encapsulating CompoundsProducts.Current edition approved Nov. 1, 2014Nov. 1, 2018. Published November 2014Nove
10、mber 2018. Originally approved in 1994. Last previous edition approved in 20102014as D5638 05 (2010).D5638 14. DOI: 10.1520/D5638-14.10.1520/D5638-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Stand
11、ardsvolume 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
12、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 appears at the end of this standardCopyrigh
13、t ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Test Specimen8.1 Prepare a minimum of five test specimens for each chemical solution to be tested and a minimum of five to determineunconditioned bond strength in accordance with Test Method
14、D2519 using a wire mutually agreed upon by supplier and user.9. 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
15、 in Test Method D2519 at standard laboratory conditions.23 6 2C and less than 55 % RH. Test conditioned specimens within 15 min of removal from container to minimize any changein bond strength after exposure. Rinse conditioned specimens with water and pat dry when water soluble chemicals were used f
16、orconditioning. Otherwise wipe specimens to remove excess 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 (p
17、ounds-force) of unconditioned coils,10.1.5 Average bond 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 formu
18、la below.%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 activity has beenplanned to develop such information.11.2 BiasTh
19、is 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 location of selected changes to this standard since the
20、last issue (D5638 05(2010)D5638 14) that may impact the use of this standard. (Approved Nov. 1, 2014Nov. 1, 2018.)(1) Revised Subsection 8.19.2.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of t
21、his 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 and must be reviewed every five y
22、ears 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 of theresponsible technical commi
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24、28-2959,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:/ 182
