1、BSI Standards PublicationBS EN ISO 4628-4:2016Paints and varnishes Evaluation of degradation ofcoatings Designation ofquantity and size of defects,and of intensity of uniformchanges in appearancePart 4: Assessment of degree of crackingBS EN ISO 4628-4:2016 BRITISH STANDARDNational forewordThis Briti
2、sh Standard is the UK implementation of ISO 4628-4:2016. It supersedes BS EN ISO 4628-4:2003 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on reques
3、t to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 86611 1 ICS 87.040 Compliance with a British Sta
4、ndard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM E
5、N ISO 4628-4 February 2016 ICS 87.040 Supersedes EN ISO 4628-4:2003English Version Paints 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
6、) 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 (ISO 4628-4:2016) Beschichtungsstoffe - Beurteilung von Beschichtungsschden - Bewe
7、rtung 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 members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
8、late 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 the CEN-CENELEC Management Centre or to any CEN member. This European S
9、tandard 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 Management Centre has the same status as the official versions. CEN members are the
10、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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
11、 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 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any
12、 means reserved worldwide for CEN national Members. Ref. No. EN ISO 4628-4:2016 EBS EN ISO 4628-4:2016EN 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 varnishes“ in collaboration with Technical Committee CEN/
13、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 conflicting national standards shall be withdrawn at the lat
14、est 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 supersedes EN ISO 4628-4:2003. According to the CEN-
15、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, France, Germany, Greece, Hungary
16、, 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 approved by CEN as EN ISO 4628-4:2016 without any mo
17、dification. BS EN ISO 4628-4:2016ISO 4628-4:2016(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Assessment . 15 Expression of results 26 Test report . 3Annex A (informative) Examples for types of cracking . 6Bibliography .15 ISO 2016 All rights reserved iiiContents Page
18、BS EN ISO 4628-4:2016ISO 4628-4:2016(E)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 out through ISO technical committees. Each member body
19、 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 Electrotec
20、hnical 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 approval criteria needed for the different types of ISO
21、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 subject of patent rights. ISO shall not be held respo
22、nsible 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 trade name used in this document is information given
23、 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 Technical Barriers to Trade (TBT) see the following
24、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 (ISO 4628-4:2003), which has been technically revised w
25、ith 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 general title Paints and varnishes Evaluation of degra
26、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
27、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 corrosioniv
28、 ISO 2016 All rights reservedBS EN ISO 4628-4:2016INTERNATIONAL STANDARD ISO 4628-4:2016(E)Paints 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 cracking1 ScopeThis par
29、t 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 and size of defects and the intensity of changes in appearance of coatings and outlines the general principles of t
30、he 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 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are ind
31、ispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) appliesISO 13076, Paints and varnishes Lighting and procedure for visual assessments of coatings3 Terms and definitio
32、nsFor 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 AssessmentAssess the quantity of cracking by reference to Table 1 and using as example Figure 1 or Figure 2, depending
33、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 (“anisotropic” substrates). Other forms of cracking occur, but the principles of assessing the quantity remain the
34、same. ISO 2016 All rights reserved 1BS EN ISO 4628-4:2016ISO 4628-4:2016(E)Table 1 Rating scheme for designating the quantity of cracksRating Quantity of cracks0 none, i.e. no detectable cracks1 very few, i.e. small, barely significant number of cracks2 few, i.e. small but significant number of crac
35、ks3 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 size of cracksRating Size of cracks0 not visible under 10 magnification1 only visible under ma
36、gnification 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 wide5 very large cracks generally more than 1 mm wideaTypically, defects larger than 0,2 mm are
37、 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 possible, indicate the depth of cracking by reference to the level in the coating system to whic
38、h 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 coat, the underlying coat(s) being substantially unaffected;c) cracks which penetrate the whole
39、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, together with the depth of cracking (a, b, or c), shown in Figures 1 and 2 together with the approxim
40、ate 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) are substantially unaffected, report the result as cracking; degree of cracking 2(S3)b.If neces
41、sary, the assessment may be amplified in words, for example “cracking in one preferential direction” and by using the descriptions given in Annex A.2 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)6 Test reportThe test report shall contain at least the following information:a) al
42、l 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
43、assessment was carried out;f) any unusual features (anomalies) observed during the assessment;g) the date of the examination. ISO 2016 All rights reserved 3BS EN ISO 4628-4:2016ISO 4628-4:2016(E)a) Quantity (density) 1 b) Quantity (density) 2 c) Quantity (density) 3d) Quantity (density) 4 e) Quantit
44、y (density) 5Figure 1 Cracking without preferential direction (panels of area 100 cm2to 200 cm2)4 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)a) Quantity (density) 1 b) Quantity (density) 2 c) Quantity (density) 3d) Quantity (density) 4 e) Quantity (density) 5Figure 2 Cracking
45、 in one preferential direction (for example due to brush marks or wood grain) (panels of area 100 cm2to 200 cm2) ISO 2016 All rights reserved 5BS EN ISO 4628-4:2016ISO 4628-4:2016(E)Annex A (informative) Examples for types of crackingASTM American Society for Testing and MaterialsTNO Nederlandse Org
46、anisatie voor Toegepast Natuurwetenschappelijk Onderzoek (Netherlands Organization for Applied Scientific Research)ASTM 8TNO 2TNO 4ASTM 6TNO 6ASTM 4ASTM 2TNO 8Figure A.1 Irregular6 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)ASTM 8TNO 2ASTM 6TNO 4ASTM 2TNO 8ASTM 4TNO 6Figure A
47、.2 Long line ISO 2016 All rights reserved 7BS EN ISO 4628-4:2016ISO 4628-4:2016(E)ASTM 6TNO 4ASTM 8TNO 2ASTM 2TNO 8TNO 6ASTM 4Figure A.3 Short parallel8 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)TNO 2ASTM 8ASTM 4TNO 6TNO 4ASTM 6ASTM 2TNO 8Figure A.4 Switch ISO 2016 All right
48、s reserved 9BS EN ISO 4628-4:2016ISO 4628-4:2016(E)ASTM 6TNO 4ASTM 2TNO 8TNO 6ASTM 4ASTM 8TNO 2Figure A.5 Crow foot10 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)TNO 2ASTM 8ASTM 6TNO 4ASTM 2TNO 8ASTM 4TNO 6Figure A.6 Mosaic ISO 2016 All rights reserved 11BS EN ISO 4628-4:2016I
49、SO 4628-4:2016(E)ASTM 8TNO 2ASTM 6TNO 4ASTM 2TNO 8TNO 6ASTM 4Figure A.7 Shrinkage12 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)ASTM 8TNO 2TNO 4ASTM 6TNO 6ASTM 4ASTM 2TNO 8Figure A.8 Short, random ISO 2016 All rights reserved 13BS EN ISO 4628-4:2016ISO 4628-4:2016(E)TNO 8ASTM 2TNO 6ASTM 4ASTM 8TNO 2ASTM 6TNO 4Figure A.9 Sigmoid14 ISO 2016 All rights reservedBS EN ISO 4628-4:2016ISO 4628-4:2016(E)Bibliography1 ISO 4628-1, Paints
