1、English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 87.040!%XL2“2534115www.din.deDIN EN ISO 4628-
2、4Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 4: Assessment of degree of cracking (ISO 4628-4:2016);English version EN ISO 4628-4:2016,English translation of DIN EN ISO 4628-4:2016-07Bes
3、chichtungsstoffe Beurteilung von Beschichtungsschden Bewertung der Menge und der Gre von Schden und der Intensitt von gleichmigen Vernderungen im Aussehen Teil 4: Bewertung des Rissgrades (ISO 4628-4:2016);Englische Fassung EN ISO 4628-4:2016,Englische bersetzung von DIN EN ISO 4628-4:2016-07Peintur
4、es et vernis valuation de la dgradation des revtements Dsignation de la quantit et de la dimension des dfauts, et de lintensit des changements uniformes daspect Partie 4: valuation du degr de craquelage (ISO 4628-4:2016);Version anglaise EN ISO 4628-4:2016,Traduction anglaise de DIN EN ISO 4628-4:20
5、16-07SupersedesDIN EN ISO 4628-4:2004-01www.beuth.deDocument comprises 23 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.July 201607.16DIN EN ISO 4628-4:2016-07 2 A comma is used as the decimal marker. National foreword This d
6、ocument (EN ISO 4628-4:2016) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Beschichtung
7、s-stoffe und Beschichtungen (DIN Standards Committee Coatings and Coating Materials), Working Committee NA 002-00-07 AA Allgemeine Prfverfahren fr Beschichtungsstoffe und Beschichtungen. DIN EN ISO 4628 consists of the following parts, under the general title Paints and varnishes Evaluation of degra
8、dation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance: Part 1: General introduction and designation system Part 2: Assessment of degree of blistering Part 3: Assessment of degree of rusting Part 4: Assessment of degree of cracking Part 5: A
9、ssessment of degree of flaking Part 6: Assessment of degree of chalking by tape method Part 7: Assessment of degree of chalking by velvet method Part 8: Assessment of degree of delamination and corrosion around a scribe or other artificial defect Part 10: Assessment of degree of filiform corrosion T
10、he DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 4628-1 DIN EN ISO 4628-1 ISO 13076 DIN EN ISO 13076 Amendments This standard differs from DIN EN ISO 4628-4:2004-01 as follows: a) a lower limit for visual assessment of defects has been in
11、troduced in Table 2; b) a normative reference to ISO 13076 for illumination for the visual assessment has been added. Previous editions DIN ISO 4628-4: 1986-12 DIN EN ISO 4628-4: 2004-01 DIN EN ISO 4628-4:2016-07 3 National Annex NA (informative) Bibliography DIN EN ISO 4628-1, Paints and varnishes
12、Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 1: General introduction and designation system DIN EN ISO 13076, Paints and varnishes Lighting and procedure for visual assessments of coatings DIN EN ISO 4628-4:
13、2016-07 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4628-4 February 2016 ICS 87.040 Supersedes EN ISO 4628-4:2003 English Version Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity o
14、f uniform changes in appearance Part 4: Assessment of degree of cracking (ISO 4628-4:2016) Peintures et vernis valuation de la dgradation des revtements Dsignation de la quantit et de la dimension des dfauts, et de lintensit des changements uniformes daspect Partie 4: valuation du degr de craquelage
15、 (ISO 4628-4:2016) Beschichtungsstoffe Beurteilung von Beschichtungsschden Bewertung der Menge und der Gre von Schden und der Intensitt von gleichmigen Vernderungen im Aussehen Teil 4: Bewertung des Rissgrades (ISO 4628-4:2016) This European Standard was approved by CEN on 19 December 2015. CEN memb
16、ers 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 obtained on applicati
17、on 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 CEN-CENELEC Managem
18、ent 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, Italy, Latvia,
19、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: Avenue Marnix 1
20、7, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4628-4:2016 E EN ISO 4628-4:2016 (E) 2 Contents Page European foreword . 3 Foreword 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Asse
21、ssment 5 5 Expression of results 6 6 Test report . 7 Annex A (informative) Examples for types of cracking . 10 Bibliography . 19 DIN EN ISO 4628-4:2016-07 EN ISO 4628-4:2016 (E) 3 European foreword This document (EN ISO 4628-4:2016) has been prepared by Technical Committee ISO/TC 35 “Paints and varn
22、ishes” 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 by August 2016, and conflic
23、ting national standards shall be withdrawn at the latest by August 2016. 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 patent rights. This document
24、 supersedes EN ISO 4628-4:2003. 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 Re
25、public of Macedonia, 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 4628-4:2016 has been
26、 approved by CEN as EN ISO 4628-4:2016 without any modification. DIN EN ISO 4628-4:2016-07 ForewordISO (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 ou
27、t 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 co
28、llaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different appr
29、oval 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 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the s
30、ubject 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 document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any t
31、rade 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 and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the
32、Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.This third edition cancels and replaces the second edition (IS
33、O 4628-4:2003), which has been technically revised with the following changes:a) lower limit for visual assessment of defects has been introduced in Table 2;b) a normative reference to ISO 13076 for illumination for the assessment has been added.ISO 4628 consists of the following parts, under the ge
34、neral title Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance: Part 1: General introduction and designation system Part 2: Assessment of degree of blistering Part 3: Assessment of degree of rustin
35、g Part 4: Assessment of degree of cracking Part 5: Assessment of degree of flaking Part 6: Assessment of degree of chalking by tape method Part 7: Assessment of degree of chalking by velvet method Part 8: Assessment of degree of delamination and corrosion around a scribe or other artificial defect P
36、art 10: Assessment of degree of filiform corrosion4EN ISO 4628-4:2016 (E) DIN EN ISO 4628-4:2016-07 1 ScopeThis part of ISO 4628 specifies a method for assessing the degree of cracking of coatings by comparison with pictorial standards.ISO 4628-1 defines the system used for designating the quantity
37、and size of defects and the intensity of changes in appearance of coatings and outlines the general principles of the system. This system is intended to be used, in particular, for defects caused by ageing and weathering, and for uniform changes such as colour changes, for example yellowing.2 Normat
38、ive referencesThe following documents, in whole or in part, are normatively referenced in 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 any amendments) ap
39、pliesISO 13076, Paints and varnishes Lighting and procedure for visual assessments of coatings3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1degree of crackingrating characterizing cracks in a coating in terms of quantity, size, and depth4 Asse
40、ssmentAssess the quantity of cracking by reference to Table 1 and using as example Figure 1 or Figure 2, depending on the type of cracking.NOTE Figure 1 shows cracking without preferential direction and Figure 2 shows cracking in one preferential direction, which occurs with substrates such as wood
41、(“anisotropic” substrates). Other forms of cracking occur, but the principles of assessing the quantity remain the same.5EN ISO 4628-4:2016 (E) DIN EN ISO 4628-4:2016-07 Table 1 Rating scheme for designating the quantity of cracksRating Quantity of cracks0 none, i.e. no detectable cracks1 very few,
42、i.e. small, barely significant number of cracks2 few, i.e. small but significant number of cracks3 moderate number of cracks4 considerable number of cracks5 dense pattern of cracksIf specified, assess the average size of the cracks in accordance with Table 2.Table 2 Rating scheme for designating the
43、 size of cracksRating Size of cracks0 not visible under 10 magnification1 only visible under magnification up to 102 just visible with normal corrected vision (up to 0,2 mm)a3 clearly visible with normal corrected vision (larger than 0,2 mm up to 0,5 mm)4 large cracks, larger than 0,5 mm up to 1 mm
44、wide5 very large cracks generally more than 1 mm wideaTypically, defects larger than 0,2 mm are visible with normal corrected vision.Where the test area exhibits cracks of various sizes, quote as the size rating that of the largest cracks which are numerous enough to be typical of the test area.If p
45、ossible, indicate the depth of cracking by reference to the level in the coating system to which the cracks penetrate. A distinction is made between three main types of failure by cracking:a) surface cracks which do not fully penetrate the top coat (i.e. checking);b) cracks which penetrate the top c
46、oat, the underlying coat(s) being substantially unaffected;c) cracks which penetrate the whole coating system.Carry out the assessment under good illumination, as specified in ISO 13076.5 Expression of resultsExpress the numerical ratings of the quantity and, if specified, size of the cracks, togeth
47、er with the depth of cracking (a, b, or c), shown in Figures 1 and 2 together with the approximate dimensions of the area concerned, or its proportion to the total area, expressed as a percentage.For example, for quantity 2, size 3 with the cracks penetrating the top coat and the underlying coat(s)
48、are substantially unaffected, report the result as cracking; degree of cracking 2(S3)b.If necessary, the assessment may be amplified in words, for example “cracking in one preferential direction” and by using the descriptions given in Annex A.6EN ISO 4628-4:2016 (E) DIN EN ISO 4628-4:2016-07 6 Test
49、reportThe test report shall contain at least the following information:a) all details necessary to identify the coating examined;b) a reference to this part of ISO 4628, i.e. ISO 4628-4;c) the type of surface examined, its size and, if appropriate, its location;d) the result of the examination in accordance with Clause 5;e) an indication of the illumination under which the assessment was carried out;f) any unusual features (anomalies) observed during
