1、Designation: D5642 16Standard Test Method forSealed Tube Chemical Compatibility Test1This standard is issued under the fixed designation D5642; 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
2、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 procedures for evaluating theinteraction of electrical insulation components used, or in-tended to be used, in electrica
3、l insulation systems.1.2 This test method is useful for determining compatibilitybut additional testing will potentially be required for someapplications.1.3 This test method also provides useful information aboutthe behavior of selected insulating materials when compared toa reference value as oppo
4、sed to a reference system.1.4 This test method does not cover systems which operatein liquids or gases other than air.1.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesa
5、fety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. See also 8.2.4,8.3.1 and 8.3.2.12. Referenced Documents2.1 ASTM Standard
6、s:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD1676 Test Methods for Film-Insulated Magnet WireD1711 Terminology Relating to Electrical Insulation3. Terminology3.1 Definitions:3.1.1 magnet wireSee Te
7、rminology D1711 for the defini-tion of this term.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging test, na process of exposure, to a specified setof conditions for a defined period of time, which results in anirreversible change in one or more physical, chemical,electrical, or thermal
8、characteristics of a material.3.2.2 candidate system, nthe proposed electrical insula-tion system to be evaluated.3.2.3 electrical insulation system, nan intimate combina-tion of insulating materials with conductors, as used in elec-trical equipment.3.2.4 insulation system class, na standardized des
9、ignationof the temperature capability of the electrical insulation sys-tem. It is expressed by both numbers and letters as follows:System Class105 (A)120 (E)130 (B)155 (F)180 (H)200 (N)220 (R)240 (S)3.2.5 reference system, nan electrical insulation systemwhich has been previously evaluated and found
10、 acceptable.3.2.6 twisted pair, nfilm-insulated round magnet wire thathas been prepared in accordance with Test Methods D1676.4. Summary of Test Method4.1 Acombination of specific materials is sealed in a limitedspace and subjected to a specific elevated temperature for aspecified time. Following th
11、is exposure the dielectric break-down voltage of the insulated conductors is used as a basis forjudging the compatibility of the candidate system.5. Significance and Use5.1 This test method is useful for evaluating a combinationof materials for potential use in an electrical insulation system.6. App
12、aratus6.1 Oven, capable of maintaining the required exposuretemperature within 63 C.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.17 on Fire and Thermal Properties.Current edition
13、 approved Nov. 1, 2016. Published November 2016. Originallyapproved in 1994. Last previous edition approved in 2009 as D5642 09. DOI:10.1520/D5642-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStand
14、ards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Glass Tubes with inside volu
15、me not exceeding 900 mLthat can be sealed. Two general types are described as follows:6.2.1 Flanged High Temperature Glass Tubes which aredesigned to be sealed with metal rings and gaskets arepreferred.6.2.2 Glass Tubes, which can be fusion sealed after theaddition of all materials are acceptable al
16、ternatives.6.3 Gasket Materials for use with tubes described in 6.2.1.6.3.1 Type TFE (Tetrafluoroethylene) or FEP (Perfluoroeth-ylene Propylene) Fluorocarbon.6.3.2 Hexafluoropropylenevinylidene fluoride elastomercan be used for exposure temperatures not exceeding 155 C.6.4 Apparatus in conformance w
17、ith Test Method D149 tomeasure dielectric breakdown voltage.7. Material Specimens7.1 The specific list of materials to be tested is to beestablished by agreement between interested parties.7.2 Represent each of the non-metallic components of theelectrical insulation system, with the exception of an
18、impreg-nating varnish and insulated conductors, with a specimenhaving a minimum mass of 250 mg.7.3 Insulated Conductor Specimens:7.3.1 Use film insulated magnet wire twisted pairs con-structed in accordance with Test Methods D1676;18AWGheavy build is preferred.7.3.2 For conductors not suitable for c
19、onstructing twistedpairs, use specimens having a minimum length of 200 mm.NOTE 1An example of conductors not suitable for constructingtwisted pairs is fibrous wrapped conductors. They shall be represented asdescribed in 7.3.2.7.4 Apply impregnating varnish to the insulated conductorsand cure per man
20、ufacturers recommendations.8. Procedures8.1 Tube Loading and Sealing:8.1.1 Clean and dry tubes as needed prior to use.8.1.2 Prepare one tube with the materials that represent thereference system. Insert all materials as specified in Section 7into the tube. For each magnet wire type insert a minimum
21、offive twisted pairs or three straight lengths prepared in accor-dance with Section 7.NOTE 2It is acceptable to place a stainless steel screen as a barrier torestrict physical contact of the insulated conductors from the othermaterials in the tube, to avoid damage to the insulated conductorspecimens
22、.8.1.3 Prepare one tube for each candidate system in thesame manner in which the reference system tube was prepared.8.1.4 Condition each unsealed tube and its contents for 1 hat 105 C. The purpose of this procedure is to minimize themoisture content of all materials in the tube. It is an acceptablep
23、rocedure to condition materials outside the tube to allowsufficient drying prior to 8.1.2 and 8.1.3. Concurrently condi-tion tubes and gaskets.8.1.5 Certain materials, including but not limited to hygro-scopic papers, require additional conditioning to remove mois-ture. If agreed upon by interested
24、parties, the use of highertemperatures and times for drying is acceptable. Select a timeand temperature that do not cause loss of other volatilematerials or cause thermal decomposition.8.1.6 Seal tubes within 3 min after conditioning, and leaktest immediately thereafter in accordance with 8.1.6.2.8.
25、1.6.1 Seal flanged glass tubes by applying a sufficienttorque to ensure a seal that is leak free.Atorque of 3.4 Nm (30inch-pounds) in increments of 0.56 Nm (5 inch-pounds),alternating between bolts to tighten evenly and securely hasbeen found acceptable for this purpose.8.1.6.2 Check glass tubes for
26、 leaks using the followingprocedure: Submerge the still warm tubes into room tempera-ture tap water for a minimum of 2 min. Observe the tubes afterthey have reached room temperature for condensation on theinner walls. Condensation is a result of leakage.8.1.6.3 Do not use tubes that exhibit leakage.
27、8.2 Aging:8.2.1 Place the tubes into an oven that is at room tempera-ture.8.2.2 Apply power to the oven and allow it to attain theaging temperature.8.2.2.1 Place sealed tubes into a heated oven but be awarethat the thermal shock will cause stresses that have thepotential to result in cracking of the
28、 glass tubes. Do not use anytubes that crack as a result of such treatment.8.2.3 The aging temperature shall be 25C greater than thenumerical insulation system class of the reference system.8.2.4 After a minimum of 336 h exposure to the agingtemperature, remove the tubes from the oven.As an alternat
29、ive,to reduce the extent of thermal shock, turn off the power to theoven and allow the oven and tubes to cool to room temperature.(Warning Use protective equipment including safetyglasses or face shield and high temperature gloves whenhandling heated glass tubes. It is feasible that glass tubes will
30、shatter upon being subjected to thermal shock.)8.3 Procedures for Testing:8.3.1 Open the tubes within 72 h of the completion of aging.Remove the insulated conductor specimens. (WarningUseadequate ventilation when opening the tubes. It is likely thatfumes emitted from the tube will be toxic.)8.3.2 De
31、termine the dielectric breakdown voltage of twistedpair conductors in accordance with Test Methods D1676.8.3.2.1 Warning It is feasible that lethal voltages will bepresent during this test. It is essential that the test apparatus,and all associated equipment potentially electrically connectedto it,
32、be properly designed and installed for safe operation.Solidly ground all electrically conductive parts that any personmight come in contact with during the test. Provide means foruse at the completion of any test to ground any parts which:were at high voltage during the test; have the potential to h
33、aveacquired an induced charge during the test; have the potentialto retain a charge even after disconnection of the voltagesource. Thoroughly instruct all operators in the proper way toconduct tests safely. When making high voltage tests, particu-larly in compressed gas or in oil, it is feasible tha
34、t the energyreleased at breakdown will be suffcient to result in fire,explosion, or rupture of the test chamber. Design testequipment, test chambers, and test specimens so as to minimizeD5642 162the possibility of such occurrences and to eliminate thepossibility of personal injury.8.3.3 For straight
35、 conductor specimens prepare electrodesby applying 6 mm wide thin metal foil to the center of a 13 mmwide, 75 mm long strip of pressure sensitive tape. Apply twoelectrodes at right angles to each specimen at intervals approxi-mately13 the length of the specimen and wrap smoothly andfirmly around the
36、 specimen a minimum of 1 and12 completeturns, with the metal surface of the foil in contact with theinsulation.8.3.4 If necessary, modify the electrode configuration asnecessary for specific applications: Such modification shall beas agreed between interested parties.8.3.5 Record the results.9. Inte
37、rpretation of Results9.1 For each type of conductor taken from each tube,calculate the average of at least five dielectric breakdownvoltage values using all of the dielectric breakdown voltagesobtained. The criteria to be used for eliminating any onedielectric breakdown voltage value from the calcul
38、ation of theaverage is to be determined by agreement between interestedparties prior to testing.9.2 A comparison of the average dielectric breakdownvoltage values obtained for the conductor specimens takenfrom the candidate and reference tubes is the basis fordetermining the compatibility of the mat
39、erials in a candidatesystem. The maximum acceptable difference between theaverage values shall be established by agreement betweeninterested parties.10. Report10.1 Report the following information:10.1.1 Designation and description of the reference andcandidate system including all components,10.1.2
40、 Pre-conditioning or drying conditions,10.1.3 Aging temperature, and10.1.4 Length of exposure time.10.1.5 For each type of conductor taken from each tube,10.1.5.1 Individual dielectric breakdown voltage values,and10.1.5.2 Average dielectric breakdown voltage value.11. Precision and Bias11.1 No state
41、ment is made about either the precision or biasof this test method since the result merely states whether thereis conformance to the criteria for acceptability defined in termsof this test method.12. Keywords12.1 chemical compatibility; electrical insulation system;sealed tubeSUMMARY OF CHANGESCommi
42、ttee D09 has identified the location of selected changes to this standard since the last issue(D5642 09) that may impact the use of this standard. (Approved Nov. 1, 2016.)(1) Revised 1.2, 1.3, 8.1.5, 8.2.2.1, 8.2.4, 8.3.1, 8.3.2.1, and8.3.4 to remove non-mandatory language (“may” and“should”).ASTM I
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44、ely 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 reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand
45、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 feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on
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