1、BSI Standards PublicationBS EN ISO 16927:2014Paints and varnishes Determination ofthe overcoatability andrecoatability of a coating (ISO16927:2014)BS EN ISO 16927:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO16927:2014.The UK participation in its prep
2、aration was entrusted to TechnicalCommittee STI/10, Test methods for paints.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctap
3、plication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 75222 3ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committ
4、ee on 28 February 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 16927 January 2014 ICS 87.040 English Version Paints and varnishes - Determination of the overcoatability and recoatability of a coating (ISO 16927:2014) Peintures et
5、vernis - valuation des possibilits dapplication dune couche supplmentaire du mme produit ou dun autre produit de peinture (ISO 16927:2014)Beschichtungsstoffe - Prfung der berarbeitbarkeit und berlackierbarkeit einer Beschichtung (ISO 16927:2014) This European Standard was approved by CEN on 6 Decemb
6、er 2013. CEN members are 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 obta
7、ined on application to the CEN-CENELEC Management Centre or to any CEN 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 CEN member into its own language and notified to the CE
8、N-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland
9、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre
10、: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 16927:2014 EBS EN ISO 16927:2014EN ISO 16927:2014 (E) 3 Foreword This document (EN ISO 16927:2014) has been prepared by Technical Committe
11、e ISO/TC 35 “Paints and varnishes” in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest
12、 by July 2014, and conflicting national standards shall be withdrawn at the latest by July 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such pate
13、nt rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
14、France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 16927:2014 has been approved by CEN as EN
15、 ISO 16927:2014 without any modification. BS EN ISO 16927:2014ISO 16927:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Sampling 25 Preparation of test coatings 26 Preparation of test 27 Procedure and evalu
16、ation . 27.1 Application of the coating material . 27.2 Observations during recoating 27.3 Tests after drying/hardening or stoving 27.4 Evaluation 38 Test report . 3Bibliography 4BS EN ISO 16927:2014ISO 16927:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide fede
17、ration 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 commi
18、ttee. 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.The procedures used to develop this document and
19、 those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part
20、 2 (see www.iso.org/directives).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. Details of any patent rights identified during the development of the
21、 document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms
22、 and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 35, Paints and varnishes, Sub
23、committee SC 9, General test methods for paints and varnishes.iv ISO 2014 All rights reservedBS EN ISO 16927:2014ISO 16927:2014(E)IntroductionThe terms “overcoatability” and “recoatability” are used differently. Hence, there are numerous different test methods. Aiming for a standardization and facil
24、itation of communication between contractor and customer, in this International Standard a test method has been prepared which determines the procedure for testing the overcoatability and/or recoatability of a coating.“Overcoatability” is applicable to the multi-coat system in manufacture, e.g. appl
25、ying a top coat to the priming coat.“Recoatability” is applicable to repairing or recoating of already completed constructions, e.g. during or immediately after installation.It was impossible to specify a suitable test method for all indicated cases and to combine them in a International Standard.Th
26、e limitation to “unaged” coatings should be understood as coatings not yet exposed to corrosion stress or similar stress which might influence the recoatability performance. In the case of arising difficulties concerning the interpretation of the term, e.g. in regard to priming coats as protection f
27、or intermediate storage or transport when it takes some time before another coating material is applied, the contracting parties should especially agree upon the approach.Note that the recoatability performance for certain coating materials might be time-dependent. Furthermore, it is recommended tha
28、t an intermediate drying/hardening should be adapted to in-practice conditions, if such a particular intermediate drying/hardening is specified or agreed before recoating.This International Standard leaves various aspects subject to agreement to a much larger extent than common in other standards. H
29、owever, achieving a wide-ranging applicability of the procedure only allowed such an approach. ISO 2014 All rights reserved vBS EN ISO 16927:2014BS EN ISO 16927:2014Paints and varnishes Determination of the overcoatability and recoatability of a coating1 ScopeThis International Standard specifies a
30、method for testing the overcoatability and recoatability of unaged single-coat or multi-coat systems using a coating material which is intended for repairing damaged areas during or after installation.Since the testing of overcoatability and recoatability can be conducted under different conditions,
31、 this International Standard only specifies one procedure and indicates the basic parameters.The existing single-coat or multi-coat system is indicated as coating A and the new single-coat or multi-coat system as coating B. The same applies analogously for the respective coating materials.2 Normativ
32、e referencesThe following documents, in whole or in part, are normatively referenced is this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including all amendments).appl
33、ies.ISO 1513, Paints and varnishes Examination and preparation of test samplesISO 1514, Paints and varnishes Standard panels for testingISO 1520, Paints and varnishes Cupping testISO 2409, Paints and varnishes Cross-cut testISO 2808, Paints and varnishes Determination of film thicknessISO 2813, Pain
34、ts and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85ISO 2815, Paints and varnishes Buchholz indentation testISO 3668, Paints and varnishes Visual comparison of the colour of paintsISO 9117-5, Paints and varnishes Drying tests Part 5: Modified Bandow-Wolff tes
35、tISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1recoatabilityability of a film of a coating material to accept a further coat of the same coating material3.2overcoa
36、tabilityability of a film of a coating material to accept a coat of a different coating materialINTERNATIONAL STANDARD ISO 16927:2014(E) ISO 2014 All rights reserved 1BS EN ISO 16927:2014ISO 16927:2014(E)4 SamplingTake a representative sample of the coating material to be tested as specified in ISO
37、15528. Examine each sample in accordance with ISO 1513 and prepare for further testing.For testing completed coatings take samples in a manner so they are valid as representative samples.5 Preparation of test coatingsAs the substrate of coating A, use the material for which the coating material is i
38、ntended.Clean and degrease the substrate in accordance with ISO 1514.Apply and aftertreat, if applicable, coating A as agreed.6 Preparation of testSlightly dry-grind (or down to the substrate, respectively) 1/3 or 2/3 of the surfaces of air-drying coatings after reaching degree of drying 6 in accord
39、ance with ISO 9117-5 and oven-dried coatings after taking from the oven and cooling down to room temperature, using 400 grade abrasive paper. The last third will not be ground.When coating A consists of several layers and these layers are included in the testing of recoatability, additional test pan
40、els, on which the coating is being ground down to the respective layer, shall be produced.Clean the surfaces with a smooth brush or cloth after grinding.Precisely measure the film thickness of coating A before and after grinding in accordance with one of the methods specified in ISO 2808.7 Procedure
41、 and evaluation7.1 Application of the coating materialImmediately after cleaning coating A, apply and dry/harden the coating material B as agreed.Precisely measure the film thickness of coatings A and B after drying in accordance with one of the methods specified in ISO 2808.7.2 Observations during
42、recoatingObserve during recoating and during drying time (see 7.3), if surface defects occur, e.g. swelling, lifting of the film, rippling, wetting defects, colour changes, on the ground or unground surfaces and on the edges of the test panels. Report the time when such defects are first observed.7.
43、3 Tests after drying/hardening or stoving7.3.1 GeneralConduct the tests in accordance with 7.3.2 to 7.3.6 on air-drying coatings after reaching degree of drying 6 in accordance with ISO 9117-5 and on oven-drying coatings after 12 h after taking from the oven at the earliest. In both cases conduct th
44、e tests on the ground as well as on the unground surfaces of the test panels. Additional tests, e.g. for blistering and cracking or with particular stress, shall be specifically agreed.2 ISO 2014 All rights reservedBS EN ISO 16927:2014ISO 16927:2014(E)7.3.2 Cross-cut testConduct the cross-cut test i
45、n accordance with ISO 2409.NOTE 1 For filled surfaces a cross-cut test is inappropriate.NOTE 2 The adhesion between the coatings is often deteriorated when exposed to moisture.7.3.3 Buchholz indentation testConduct the Buchholz indentation test in accordance with ISO 2815.7.3.4 Cupping testConduct t
46、he cupping test in accordance with ISO 1520.NOTE For certain coating systems (e.g. using meagre fillers or thick film fillers) a cupping test is uninformative.7.3.5 GlossMeasure the gloss in accordance with ISO 2813.7.3.6 ColourDetermine any resulting colour change in accordance with ISO 3668, if no
47、t otherwise agreed.7.4 EvaluationDetermine the outcome of the test by comparing the results for the test panels with those from panels with only one coating.8 Test reportThe test report shall contain at least the following information:a) the type and identification of coating materials A and B;b) a
48、reference to this International Standard (ISO 16927:2014);c) the material (material number, if applicable), surface properties and pre-treatment of the substrate;d) the processing of the coating materials (e.g. spraying), drying/hardening conditions (e.g. 20 min at 140 C or 48 h air-dried at 23 C an
49、d 50 % relative humidity) and drying/hardening time until grinding coating A;e) the film thickness of the ground and unground surfaces of coating A and the coatings A and B, in micrometres;f) the results of the test according to 7.2, indicating the period of time until the defects occur, depending on type of defect in seconds, minutes, or hours;g) the results of the tests according to 7.4;h) any deviations, by agreement or otherwise, of test conditions specified in this International Standard;i) any unusual features (anomalie
