EN 60068-2-45-1992 en Basic Safety Publication - Environmental testing Part 2 Test methods Test XA and guidance immersion in cleaning solvents (Incorporates Amendment A1 1993)《环境试验.pdf

1、BRITISH STANDARD BS EN 60068-2-45: 1993 IEC68-2-45: 1980 Incorporating Amendment Nos.1 and 2 Environmental testing Part2.1: Tests Test XA and guidance Immersionincleaning solvents This Part should be read in conjunction with BS2011-1.1 General and guidance The European Standard EN60068-2-45:1992 has

2、 the status of a BritishStandard UDC621.3:620.193.44BSEN60068-2-45:1993 This British Standard, having been prepared under the directionof the GeneralElectrotechnical Engineering Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 31 August1981 BSI 06-

3、1999 The following BSI references relate to the work on this standard: Committee reference GEL/15 Draft for comment78/27908 DC ISBN 0 580 12272 7 Amendments issued since publication Amd. No. Date of issue Comments 7553 April 1993 8014 November 1993 Indicated by a sideline in the marginBSEN60068-2-45

4、:1993 BSI 06-1999 i Contents Page National foreword ii Foreword 2 1 Scope 3 2 Object 3 3 Types of test solvents and conditions 3 4 Initial measurements 3 5 Conditioning 3 6 Recovery 4 7 Final measurements 4 8 Information to be given in the relevant specification 4 Appendix A Guide to test XA 5 Appen

5、dix B Suitable apparatus for boiling solvent test 8 Annex ZA (normative) Other international publications quotedinthisstandardwith the references of the relevant European publications Inside back coverBSEN60068-2-45:1993 ii BSI 06-1999 National foreword This British Standard has been prepared under

6、the direction of the General Electrotechnical Engineering Standards Committee and is identical with IEC Publication68-2-45:1980 “Basic environmental testing procedures Part2:Tests Test XA and guidance: Immersion in cleaning solvents”, published by the International Electrotechnical Commission (IEC).

7、 In 1992 the European Committee for Electrotechnical Standardization (CENELEC) accepted IEC 68-2-45:1980 together with the corrigendum issued in1981 as European Standard EN 60068-2-45:1992. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN 60068-2-45

8、 and any reference to BS 2011-2.1XA should be read as a reference to BS EN 60068-2-45. This standard has been prepared as a result of international discussions in which the UK took an active part. In1993 the European Committee for Electrotechnical Standardization (CENELEC) accepted Amendment No.1:19

9、93 to IEC68-2-45:1980 as amendment A1 to EN60068-2-45:1992. Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British

10、 Standards. The committee responsible for this standard has reviewed the provisions of IEC653:1979 (for which there is no corresponding British Standard) and has decided that it is acceptable for use in conjunction with this British Standard. NOTETextual error. In3.2.1 of the English text of IEC68-2

11、-5 the temperature value23 5 C was incorrectly printed as23+5C. The error has been corrected in this British Standard and has been reported to IEC in a proposal to amend the IEC text. Additional information. BS2011-2.1R:1976 “Resistance to fluids”, is unaffected by the publication of test XA. All Pa

12、rts of BS2011 are listed in BSI Sectional List26 (SL26), which is usually revised annually. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not

13、 of itself confer immunity from legal obligations. Cross-references International standard Corresponding British Standard ISO817:1974 BS4580:1970 Number designation of organic refrigerants (Technically equivalent) ISO4046:1978 BS3203:1979 Glossary of paper, board, pulp and related terms (Identical)

14、Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment tabl

15、e on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60068-2-45 August1992 +A1July 1993 UDC621.3:620.193.44 Supersedes HD323.2.45 S1:1988 Descriptors: Electricity, components, cleaning, de-greasing with solvents, cleaning solvents, procedures, components specifications wri

16、ting English version Basic Safety Publication Environmental testing Part2:Test methods Test XA and guidance: immersionincleaning solvents (includes amendment A1:1993) (IEC68-2-45:1980+corrigendum1981) Publication fondamentale de scurit Essais denvironnement Deuxime partie: Essais EssaiXA et guide: I

17、mmersion dans les solvants de nettoyage (inclut lamendement A1:1993) (CEI68-2-45:1980) Umweltprfungen Teil2: Prfungen Prfung XA und Leitfaden: Tauchen in flssige Reinigungsmittel (enthltnderungenA1:1993) (IEC68-2-45:1980) This European Standard was approved by CENELEC on1992-06-16. CENELEC members a

18、re bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to

19、 the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has th

20、e same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Com

21、mittee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1992 Copyright reserved to CENELEC members Ref. No. EN60068-2-45:1992+A1:1993 EEN60068-2-45:1992 BSI 0

22、6-1999 2 Foreword As a consequence of the IEC-CENELEC Agreement, HD323.2.45 S1:1988 (IEC68-2-45:1980) with its corrigendum of September1981 was submitted to the CENELEC voting procedure for conversion into a European Standard. The text of the International Standard was approved by CENELEC as EN60068

23、-2-45 on1992-06-16. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard,Annex ZA is normative. Foreword to amendment A1 The text of document50(CO)257, as prepared by IEC technical committee50, Environmental testing, was submitted to t

24、he IEC-CENELEC parallel vote in January1992. The reference document was approved by CENELEC as A1 to EN60068-2-45 on6 July1993. The following dates were fixed: latest date of publication of an identical national standard (dop)1993-09-01 latest date of withdrawal of conflicting national standards (do

25、w)1993-09-01 latest date of publication ofan identical national standard (dop)1994-07-01 date of withdrawal of conflicting national standards (dow) 1994-07-01EN60068-2-45:1992 BSI 06-1999 3 1 Scope This standard comprises a test procedure whereby specimens to be tested are immersed in a certain solv

26、ent at a specified temperature and for a specified time. If required by the relevant specification, after immersion and drying, specimens shall be rubbed with cotton wool or wrapping tissue paper. Guidance on the test is given in the appendix. 2 Object To determine the effects of prescribed cleaning

27、 solvents on electronic components and other parts suitable to be mounted on printed boards when subjected to immersion in the cleaning solvents stated below. NOTEThis test is not intended to simulate the effects of handling. 3 Types of test solvents and conditions 3.1 Solvents Three commonly used s

28、olvents are specified for the purpose of this test. NOTESuccessful compliance with this test does not imply resistance to other solvents. 3.1.1 A mixture of1,1,2-trichlorotrifluoroethane, 70 5% by weight and2-propanol (isopropyl alcohol),30 5% by weight. Commercially available grades (industrial use

29、) shall be used. NOTE 11,1,2-trichlorotrifluoroethane will be hereinafter referred to as R113, in accordance with ISO/R817:1974. NOTE 2The above mixture is obtainable as a finished product from suppliers of chemicals. WARNING:The component1,1,2-trichlorotrifluoroethane is hazardous to the environmen

30、t; therefore this solvent shall not be used where the solvent specified in sub-clause3.1.2 is adequate. 3.1.2 Propan-2-ol (isopropyl alcohol) industrial use shall be used whenever possible. NOTEThis solvent is obtainable as a finished product from suppliers of chemicals. 3.1.3 Demineralized or disti

31、lled water having a resistivity of not less than5007m corresponding to a conductivity of2mS/m. NOTEIn technically justified cases other solvents similar in activity to the recommended ones may be used as prescribed in the relevant specifications. 3.2 Test conditions 3.2.1 Solvent temperatures For th

32、e solvent specified in Sub-clause3.1.1, one of the following temperatures shall be chosen: 1) 23 5 C 48.6C to50.5C (boiling temperature). NOTEThe temperatures48.6C to50.5C are the boiling points at the composition limits of the R113/2-propanol (isopropyl alcohol) mixture when carrying out a complete

33、 reflux at101.3kPa (1013 mbar). The normal boiling point is49.2C. For the solvent specified in Sub-clause3.1.2, the temperature to be applied is: 55 5 C NOTEFor other solvents (see note of Sub-clause3.1.2), the temperature shall be23 5C or the boiling temperature as specified in the relevant specifi

34、cation. 3.2.2 Duration of immersion 5 0.5 min, in every case. 4 Initial measurements If the test is made to determine the superficial effects on marking, encapsulation, coating, etc., the specimen shall be visually inspected. If the test is made to determine the effects on the characteristics of the

35、 specimen, the relevant specification may also require electrical and/or mechanical measurements. 5 Conditioning The relevant specification shall prescribe which of the following methods is to be used. 5.1 Method 1 (with rubbing) The specimens shall be completely immersed in one of the solvents spec

36、ified in Sub-clause3.1 at one of the temperatures given in Sub-clause3.2.1 and for the time given in Sub-clause3.2.2. After removal of the specimen from the solvent, the specimen shall be allowed to dry for at least5 min. Then the marking area shall be rubbed with cotton wool or with wrapping tissue

37、 paper to determine the durability of the marking. The detail specification shall indicate the rubbing material to be used. Ten strokes, five in each of two opposite directions, shall be applied over the marking area with a force of5 0.5N over an area of about1cm 2and at a rate of about two strokes

38、per second. A recommmended test jig is described in Sub-clauseA.2.3 of Appendix A. New cotton wool or wrapping tissue paper shall be used for each specimen to be tested. 1) See note in national foreword.EN60068-2-45:1992 4 BSI 06-1999 NOTECommercially available cotton wool, e.g.as supplied for medic

39、al purposes, may be used. Wrapping tissue paper as specified in Sub-clause6-86 of ISO Standard4046:1978 may be used. This publication describes the paper as: “thin, soft, relatively tough paper generally intended for packaging delicate articles, its substance being between12g/m 2and25g/m 2 ”. Commer

40、cially available soft tissue paper handkerchiefs are also suitable. 5.2 Method 2 (without rubbing) The specimen shall be completely immersed in one of the solvents specified in Sub-clause3.1 at one of the temperatures given in Sub-clause3.2.1 and for the time given in Sub-clause3.2.2. 6 Recovery If

41、final electrical and/or mechanical measurements are required, the specimen shall remain under standard atmospheric conditions for testing for not less than1h and not more than2h or for a period as prescribed in the relevant specification, after removal from the solvent. 7 Final measurements If the t

42、est is made to determine the superficial effects on marking, encapsulation, coating, etc., the specimen shall be visually inspected. If the test is made to determine the effects on the performed characteristics of the specimen the relevant specification may also require electrical and/or mechanical

43、measurements. 8 Information to be given in the relevant specification When this test is included in the relevant specification, the following details shall be given as far as they are applicable: 8.1 Solvent to be used (Sub-clause3.1). 8.2 Solvent temperature (Sub-clause3.2.1). 8.3 Initial measureme

44、nts, if any (Clause4). 8.4 Conditioning, Method1 or Method2 (Clause5). 8.5 Rubbing material cotton wool or tissue paper (Sub-clause5.1). 8.6 Recovery time, if different from1h to2h (Clause6). 8.7 Final measurements (Clause7). 8.8 Acceptance criteria: 8.8.1 for superficial effects; 8.8.2 for electric

45、al and/or mechanical parameters.EN60068-2-45:1992 BSI 06-1999 5 Appendix A Guide to test XA A.1 General Many components or parts to be mounted on printed boards will be subjected to solvent cleaning processes. To simulate effects of such cleaning operations and to verify the resistance of components

46、 or parts to solvents, test XA shall be applied. The test contains two methods: 1) To determine the superficial effects on marking, encapsulation, coating, etc. 2) To determine the effects on the characteristics of the specimen. The test should not be applied until at least48h after marking as some

47、marking inks cure by atmospheric reaction. A.2 Cleaning A.2.1 Basic considerations: methods, solvents Soldered printed circuits, i.e.boards plus components, can be cleaned in different ways. In many cases total immersion of printed circuits in certain solvents is required. In those cases components

48、on boards have to withstand a short-time immersion in the relevant cleaning solvent. Generally the cleaning solvent used depends on the soldering flux chosen. A.2.1.1 Printed circuits fluxed with colophony based fluxes These circuits may be cleaned effectively by fluorocarbon/alcohol mixtures as wid

49、ely used and commercially available under different trade names. To remove fluxes and flux residues, circuits are normally: immersed in a cold solvent (at ambient temperature), or immersed in a boiling solvent, or successively immersed in a cold and a boiling solvent. A.2.1.2 Printed circuits fluxed with water-soluble fluxes These circuits are cleaned by warm water spraying or by immersion in warm water. A.2.2 Choice of test solvents and test conditions A.2.2.1 Solvents To remove colophony based fluxes and