1、BSI Standards PublicationBS EN ISO 4628-7:2016Paints and varnishes Evaluation of degradation ofcoatings Designation ofquantity and size of defects,and of intensity of uniformchanges in appearancePart 7: Assessment of degree of chalking byvelvet methodBS EN ISO 4628-7:2016 BRITISH STANDARDNational fo
2、rewordThis British Standard is the UK implementation of EN ISO 4628-7:2016. It supersedes BS EN ISO 4628-7:2003 which iswithdrawn. 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
3、 obtained on request 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 86613 5 ICS 87.040 Compliance
4、 with a British Standard 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 EUROPENN
5、E EUROPISCHE NORM EN ISO 4628-7 February 2016 ICS 87.040 Supersedes EN ISO 4628-7:2003English 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 7: Assessment of degree of chalki
6、ng by velvet method (ISO 4628-7:2016) 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 7: valuation du degr de farinage selon la mthode du morceau de velours (ISO 4628-
7、7:2016) Beschichtungsstoffe - Beurteilung von Beschichtungsschden - Bewertung der Menge und der Gre von Schden und der Intensitt von gleichmigen Vernderungen im Aussehen - Teil 7: Bewertung des Kreidungsgrades nach dem Samtverfahren (ISO 4628-7:2016) This European Standard was approved by CEN on 19
8、December 2015. 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 b
9、e obtained 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
10、the CEN-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, I
11、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management C
12、entre: Avenue Marnix 17, 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 4628-7:2016 EBS EN ISO 4628-7:2016EN ISO 4628-7:2016 (E) 3 European foreword This document (EN ISO 4628-7:2016) has been prepared by
13、Technical Committee 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 endorsem
14、ent, at the latest by August 2016, and conflicting 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 identifyin
15、g any or all such patent rights. This document supersedes EN ISO 4628-7:2003. 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,
16、 Denmark, Estonia, Finland, Former Yugoslav Republic 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. Endorseme
17、nt notice The text of ISO 4628-7:2016 has been approved by CEN as EN ISO 4628-7:2016 without any modification. BS EN ISO 4628-7:2016ISO 4628-7:2016(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Materials . 26 Assessment . 27 Test report . 3Bibliography 5 I
18、SO 2016 All rights reserved iiiContents PageBS EN ISO 4628-7:2016ISO 4628-7:2016(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 throug
19、h 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 collaborat
20、es 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 approval cri
21、teria 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 subject o
22、f 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 trade nam
23、e 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 Technica
24、l 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 method for paints and varnishes.This second edition cancels and replaces the first edition (ISO 4628-7:
25、2003), which has been technically revised with the following changes:a) the pictorial reference standard for numerical chalking ratings 1 to 5 have been copied fromISO 4628-6:2011;b) a normative reference to ISO 13076 for illumination for the assessment has been added.ISO 4628 consists of the follow
26、ing parts, under the general 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: Assessm
27、ent of degree of rusting 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 ot
28、her artificial defect Part 10: Assessment of degree of filiform corrosioniv ISO 2016 All rights reservedBS EN ISO 4628-7:2016INTERNATIONAL STANDARD ISO 4628-7:2016(E)Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform ch
29、anges in appearance Part 7: Assessment of degree of chalking by velvet method1 ScopeThis part of ISO 4628 specifies a method suitable, in particular, for rating the degree of chalking on white or coloured exterior coatings and coating systems on rough surfaces (i.e. those having a roughness greater
30、than segment 4 of the reference comparator G as described in ISO 8503-1).The test method specified can also be used for the assessment of the degree of chalking of coatings and coating systems on smooth surfaces, but the method specified in ISO 4628-6:2011 is preferable for this purpose.The test met
31、hod is applicable to coatings and coating systems on mineral substrates, e.g. fibre cement, brick, concrete, and renderings, independent of the structure of the surface. The method can be used quite effectively by experienced operators and is recommended for laboratory use as well as for on-site eva
32、luation.NOTE 1 When a reference to this test method is included in specifications, the test conditions (i.e. weathering method and substrate) have to be agreed between the interested parties.NOTE 2 The method described in this part of ISO 4628 is a relative ranking method and is therefore not suitab
33、le for use in agreements between parties. See, however, the Note to Table 1.NOTE 3 Refer to ISO 4628-1 for the designation system for quantity and size of defects and the intensity of changes in appearance of coatings, as well as general principles of the system.2 Normative referencesThe following d
34、ocuments, 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) applies.ISO 13076, Paints and v
35、arnishes Lighting and procedure for visual assessments of coatings3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1chalkingappearance of a loosely adherent fine powder on the surface of a film arising from the degradation of one or more of its co
36、nstituents4 PrincipleLoosely adherent powder is removed from the coating under test, using a suitable fabric. The degree of chalking is assessed with reference to a rating scale. ISO 2016 All rights reserved 1BS EN ISO 4628-7:2016ISO 4628-7:2016(E)5 Materials5.1 Fabric, as agreed between the interes
37、ted parties, to rub against the surface being tested. Black wool felt, velvet, and velveteen have proven particularly effective for light coatings and a white fabric for dark coatings.6 AssessmentCarry out the assessment under good illumination, as specified in ISO 13076.Carry out the assessment in
38、duplicate, unless otherwise agreed.Using the index finger, press the fabric against the coating being tested with firm pressure. Rotate the fabric once through an angle of 180. Remove the fabric and assess the degree of chalking under diffuse light in reference to the rating scheme shown in Table 1.
39、A mechanical apparatus should be preferred if comparable results are obtained; the coating may also be wiped once with the fabric.Table 1 Rating scheme for designating the degree of chalking (derived from ISO 4628-1:2016, Table 3)Rating Degree of chalking0 unchanged, i.e. no perceptible chalking1 ve
40、ry slight, i.e. just perceptible chalking2 slight, i.e. clearly perceptible chalking3 moderate, i.e. very clearly perceptible chalking4 considerable, i.e. pronounced chalking5 severe, i.e. intense chalkingNOTE If specified or agreed, a simpler rating system can be used. However, in such cases, the m
41、eanings of the ratings in this table which are used shall not be changed in order to avoid confusion.Examples of pictorial standards for assessing the degree of chalking are given in Figure 1. The figure is obtained with the tape method specified in ISO 4628-6:2011, but the degrees of chalking 1 to
42、5 are comparable to those specified in this part of ISO 4628.The amount of powder may vary over a given area. Therefore, the test shall be carried out at an average location on the coating. On large surfaces, the assessment shall be made at several locations, and the mean and range reported.Ratings
43、obtained with coatings exposed to natural weathering shall be treated with caution, as dirt from the atmosphere deposited on the surface can give abnormally high values of the degree of chalking.2 ISO 2016 All rights reservedBS EN ISO 4628-7:2016ISO 4628-7:2016(E)NOTE The right-hand end of each tape
44、 corresponds to chalking rating of 0.Figure 1 Pictorial reference standards for numerical chalking ratings 1 to 57 Test reportThe test report shall contain at least the following information:a) all details necessary to identify the coating tested;b) a reference to this part of ISO 4628, i.e. ISO 462
45、8-7;c) the type of surface examined, its size and, if appropriate, its location; ISO 2016 All rights reserved 3BS EN ISO 4628-7:2016ISO 4628-7:2016(E)d) the numerical rating of the degree of chalking in accordance with Clause 6 (mean value, range, andnumber of assessments);e) all details necessary t
46、o identify the fabric used;f) whether the result was obtained using the index finger or a particular apparatus (details to beindicated);g) details of any deviation from the procedure specified;h) any unusual features (anomalies) observed during the assessment;i) the date of the examination.4 ISO 201
47、6 All rights reservedBS EN ISO 4628-7:2016ISO 4628-7:2016(E)Bibliography1 ISO 4628-1, 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 system2 ISO 462
48、8-6, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 6: Assessment of degree of chalking by tape method3 ISO 8503-1, Preparation of steel substrates before application of paints and related
49、 products Surface roughness characteristics of blast-cleaned steel substrates Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces ISO 2016 All rights reserved 5This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards
