08-30189225-DC.pdf
a Date: 2 December 2008 Origin: International Latest date for receipt of comments: 28 February 2009 Project no.: 2008/02860 Responsible committee: STI/10 Test methods for paints Interested committees: Title: Draft BS EN ISO 7783 Paints and varnishes - Determination of water-vapour transmission properties - Cup method Supersession information: If this document is published as a standard, the UK implementation of it will supersede BSENISO7783-1 : 2000;BSENISO7783-2 : 1999 and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 28 February 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email cservicesbsigroup.com. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsigroup.com. Direct tel: 020 8996 7218 Responsible Committee Secretary: Mr R G Tanfield (BSI) E-mail: roger.tanfieldbsigroup.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30189225 DC Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are invited and will assist in the preparation of the consequent standard. Comments submitted will be reviewed by the relevant BSI committee before sending the consensus UK vote and comments to the international secretariat, which will then decide appropriate action on the draft and the comments received. If the international standard is approved, it is possible the text will be published as an identical British Standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft® Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsigroup.com/en/Standards-and-Publications/Current-work/DPCs/ Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH. IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. DRAFT INTERNATIONAL STANDARD ISO/DIS 7783 © International Organization for Standardization, 2008 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ISO/TC 35/SC 9 Voting begins on: 2008-11-06 Secretariat: BSI Voting terminates on: 2009-04-06 Paints and varnishes Determination of water-vapour transmission properties Cup method Peintures et vernis Détermination du coefficient de transmission de la vapeur d'eau Méthode au cylindre ICS 87.040 ISO/CEN PARALLEL ENQUIRY The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject of interest to European standardization. In accordance with the ISO-lead mode of collaboration as defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS vote in ISO and formal vote in CEN. In accordance with the provisions of Council Resolution 15/1993 this document is circulated in the English language only. Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué en version anglaise seulement. To expedite distribution, this document is circulated as received from the committee secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at publication stage. Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au Secrétariat central de l'ISO au stade de publication. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI ISO/DIS 7783 ii© ISO 2008 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. 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Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI ISO/DIS 7783 © ISO 2008 All rights reserved iii Contents Page 1 Scope1 2 Normative references1 3 Terms and definitions.2 4 Principle3 5 Test assembly3 5.1 Coating material, sampling.3 5.2 Substrate for non-self-supporting coatings.3 5.3 Test cup3 5.4 Ammonium dihydrogen phosphate solution (NH4H2PO4 solution) for wet cup method4 5.5 Desiccant for dry cup method4 5.6 Sealing material.4 5.7 Test room .4 5.8 Balance.5 6 Preparation of the test 5 6.1 Preparation of test pieces.5 6.2 Determination of the thickness of the coating.6 6.3 Preparation of the cups 6 6.4 Determination of the air gap for self-supporting coatings7 7 Procedure.7 8 Expression of results7 8.1 General .7 8.2 Determination of the change in mass .8 8.3 Water-vapour transmission rate V for non-self-supporting coatings.8 8.4 Water-vapour transmission rate V for self-supporting coatings9 8.5 Water-vapour diffusion-equivalent air layer thickness sd.10 8.6 Water-vapour resistance factor µ 10 9 Precision.10 9.1 Repeatability (r) .10 9.2 Reproducibility (R) 11 10 Test report11 Annex A (informative) Derivation of calculation formulae13 Annex B (informative) Use of molten wax for sealing test assembly16 Bibliography19 Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI ISO/DIS 7783 iv © ISO 2008 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7783 was prepared by Technical Committee ISO/TC 35, General test methods for paints and varnishes, Subcommittee SC 9, and by Technical Committee CEN/TC 193, Paints and varnishes in collaboration. This second edition cancels and replaces ISO 7783-1:1999 including Technical Corrigendum 1:1998 and ISO 7783-2:1999, which have been merged and technically revised. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI ISO/DIS 7783 © ISO 2008 All rights reserved v Introduction ISO 7783 deals with the sampling and testing of paints, varnishes and related products. It describes methods for determining the water-vapour transmission of self-supporting and non-self-supporting coatings. The water-vapour transmission is not necessarily a linear function of film thickness, temperature or relative- humidity difference. A determination carried out under one set of conditions may not necessarily be comparable with one carried out under other conditions. Therefore, it is essential that the conditions of test are chosen to be as close as possible to the conditions of use. Water-vapour transmission is of greatest interest under conditions of high humidity. For this reason, the wet- cup method has been adopted as the reference method. By agreement, other procedures and conditions like the dry cup method may be used. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, South Bank University, 31/01/2009 04:03, Uncontrolled Copy, (c) BSI DRAFT INTERNATIONAL STANDARD ISO/DIS 7783 © ISO 2008 All rights reserved 1 Paints and varnishes Determination of water-vapour transmission properties Cup method 1 Scope This International Standard specifies a method for determining the water-vapour transmission of paints, varnishes, coatings, coating systems and related products. The standard supplements ISO 12572. As far as possible the procedure, the definitions and the calculations have been taken over from ISO 12572. It is recommended here to consult the procedures specified in ISO 12572 as further explanations to this standard. Water-vapour transmission is of greatest interest under conditions of high humidity. For this reason, the wet- cup method has been adopted as the reference method. By agreement, other procedures and conditions like the dry cup method may be used. A water vapour transmission rate V of more than 680 g/(m² · d) (sd of less than 0,03 m) will not be accurately quantified by the test method described in this standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1512:1991, Paints and varnishes Sampling of products in liquid or paste form ISO 1513, Paints and varnishes Examination and preparation of samples for testing ISO 2528, Sheet materials Determination of water vapour transmission rate Gravimetric (cup) method ISO 3233, Paints and varnishes Determination of percentage volume of non
