1、BSI Standards PublicationBS EN ISO 4624:2016Paints and varnishes Pull-off test for adhesion (ISO4624:2016)BS EN ISO 4624:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 4624:2016.It supersedes BS EN ISO 4624:2003 which is withdrawn.The UK participation
2、in its preparation 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 it
3、s correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 79682 1ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strat
4、egy Committee on 30 April 2016.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4624 April 2016 ICS 87.040 Supersedes EN ISO 4624:2003English Version Paints and varnishes - Pull-off test for adhesion (ISO 4624:2016) Peintures et vernis - E
5、ssai de traction (ISO 4624:2016) Beschichtungsstoffe - Abreiversuch zur Bestimmung der Haftfestigkeit (ISO 4624:2016) This European Standard was approved by CEN on 20 February 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving th
6、is 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 Standard exists in three official
7、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 national standards bodies of Aust
8、ria, 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, Slovakia, Slovenia, Spain, Swede
9、n, 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 means reserved worldwide for CEN
10、 national Members. Ref. No. EN ISO 4624:2016 EBS EN ISO 4624:2016EN ISO 4624:2016 (E) 3 European foreword This document (EN ISO 4624:2016) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secreta
11、riat 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 October 2016, and conflicting national standards shall be withdrawn at the latest by October 2016. Attention is drawn
12、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 4624:2003. According to the CEN-CENELEC Internal Regulations, the nationa
13、l 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, Iceland, Ireland, Italy, Latvia, Lithua
14、nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 4624:2016 has been approved by CEN as EN ISO 4624:2016 without any modification. BS EN ISO 4624:2016ISO 4624:2016(
15、E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Principle 14 Apparatus . 25 Adhesives 46 Sampling 47 Test panels 57.1 Substrate 57.2 Preparation and coating 57.3 Drying and conditioning . 57.4 Thickness of coating . 58 Procedure. 58.1 Number of determinations . 58.2 Ambient condition
16、s . 58.3 Adhesive 58.4 Test assemblies . 58.4.1 Method A: General method (using two dollies) for testing both rigid and deformable substrates 58.4.2 Method B: Method for testing from one side only, using a single dolly (suitable for rigid substrates only) 68.4.3 Method C: Method using dollies, one a
17、s a painted substrate. 78.5 Measurement 78.5.1 Breaking strength 78.5.2 Nature of the fracture 89 Calculation and expression of results . 89.1 Breaking strength . 89.2 Nature of failure . 99.3 Example . 910 Precision . 911 Test report . 9Bibliography .11 ISO 2016 All rights reserved iiiContents Page
18、BS EN ISO 4624:2016ISO 4624:2016(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 int
19、erested 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 Electrotechnic
20、al 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 docu
21、ments 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 responsib
22、le 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 for
23、 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 URL:
24、 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 4624:2002), which has been technically revised with th
25、e following changes:a) detailed information on how to avoid distortion of the substrate during the tensile test has been added;b) the three methods using one dolly or two dollies on a painted panel and two dollies, one as painted substrate, have been named methods A, B and C;c) the supplementary tes
26、t conditions previously in Annex A have been integrated in the test report.iv ISO 2016 All rights reservedBS EN ISO 4624:2016ISO 4624:2016(E)IntroductionThis International Standard is one of two standards which describe methods for assessing the adhesion of a single coating or a multi-coat system of
27、 paint, varnish or related product by measuring the minimum tensile stress necessary to detach or to rupture the coating in a direction perpendicular to the substrate.The test result is influenced not only by the mechanical properties of the system under test, but also by the nature and preparation
28、of the substrate, the method of paint application, the drying conditions of the coating, the temperature, the humidity and other factors like the type of test instrument which has been used.One other International Standard for the evaluation of adhesion characteristics is ISO 2409. ISO 2016 All righ
29、ts reserved vBS EN ISO 4624:2016BS EN ISO 4624:2016Paints and varnishes Pull-off test for adhesion1 ScopeThis International Standard specifies three methods (i.e. one dolly or two dollies on a painted panel and two dollies, one as painted substrate) for determining the adhesion by carrying out a pul
30、l-off test on a single coating or a multi-coat system of paint, varnish or related product.These test methods have been found useful in comparing the adhesion behaviour of different coatings. It is most useful in providing relative ratings for a series of coated panels exhibiting significant differe
31、nces in adhesion.The test may be applied using a wide range of substrates. Different procedures are given according to whether the substrate is deformable, for example thin metal, plastics and wood, or rigid, for example thick concrete and metal plates. To avoid distortion of the substrate during th
32、e tensile test, it is common to use a sandwich construction. For example, for special purposes, the coating may be applied directly to the face of a test dolly.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for it
33、s application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1513, Paints and varnishes Examination and preparation of test samplesISO 1514, Paints and varnishes Standard panels for t
34、estingISO 2808, Paints and varnishes Determination of film thicknessISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testingISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling3 PrincipleThe product or system under te
35、st is applied at uniform thickness to flat panels of uniform surface texture.After drying/curing the coating system, dollies are bonded directly to the surface of the coated, cured panel using an adhesive.After curing of the adhesive, the bonded dolly assemblies are placed in a suitable tensile test
36、er. The bonded assemblies are subjected to a controlled tensile test (pull-off test), and the force required to break the coating/substrate bond is measured.To avoid possible distortion of the substrate during the tensile test, dollies with a diameter smaller than the 2 cm diameter used for steel su
37、bstrates may be used to reduce the force introduced.The test result is the tensile stress necessary to break the weakest interface (adhesive failure) or the weakest component (cohesive failure) of the test assembly. Mixed adhesive/cohesive failures may also occur.INTERNATIONAL STANDARD ISO 4624:2016
38、(E) ISO 2016 All rights reserved 1BS EN ISO 4624:2016ISO 4624:2016(E)4 Apparatus4.1 Tensile tester, suitable for carrying out the chosen procedure specified in Clause 8. The tensile stress shall be applied in a direction perpendicular to the plane of the coated substrate and shall be increased at a
39、substantially uniform rate, not greater than 1 MPa/s1)such that failure of the test assembly occurs within 90 s. Suitable designs for applying the tensile stress are shown in Figures 1 and 2.Instead of a tensile tester, other types of pull-off adhesion testers (mechanically, pneumatically, hydraulic
40、ally or hand-driven) may be used provided that they give similar results. The type of instrument shall be reported in the test report, because hand-driven/mechanical/hydraulic instruments are reported to produce widely different results.NOTE The results can be influenced by the test assembly used. F
41、urthermore, the results are not reproducible unless coaxial alignment of the tensile forces is ensured.13245Key1 support2 ball joint3 dollies4 coating5 substrateFigure 1 Example of a suitable test apparatus for the two-dolly methods described in 8.4.1 and 8.4.3 (methods A and C)1) 1 MPa/s = 1 MN/(m2
42、s).2 ISO 2016 All rights reservedBS EN ISO 4624:2016ISO 4624:2016(E)123465Key1 coating2 test piece3 dolly4 ball-and-socket sliding joint5 support (suitably designed to allow for joint assembly)6 ball-and-socket sliding jointFigure 2 Example of a suitable test apparatus for the one-dolly method descr
43、ibed in 8.4.2 (method B)4.2 Test dollies, each consisting of a steel or aluminium cylindrical-faced testing body, specifically designed to be used with the tensile tester. Each dolly has a rigid, flat face for bonding the adhesive/coating at one end and a facility for connecting the pull-off tester
44、at the other. Each dolly has a nominal diameter of 20 mm (see, however, following paragraph) and sufficient thickness to ensure freedom from distortion during the test. It is recommended that the length of each dolly is not less than half its diameter. The faces of each dolly shall be machined perpe
45、ndicular to its axis before use.Dollies with a diameter of, for example, 7 mm may be used when the method for testing adhesion from one side only is used and when there is a danger of distortion of the substrate (see 8.4.2). If dollies smaller in diameter are used, more measurements shall be made to
46、 improve the precision. When using 7 mm dollies, 10 measurements have been shown to be practicable. The diameter of the dollies shall be reported in the test report.4.3 Centering device, for ensuring proper coaxial alignment of the test assembly during the adhesion process of the two-dolly methods d
47、escribed in 8.4.1 (method A) and 8.4.3 (method C). A suitable design is shown in Figure 3.4.4 Cutting device, such as a sharp knife, for cutting through cured adhesive and the paint coating to the substrate, round the circumference of the dolly.Depending on the mechanical properties of the paint sys
48、tem (e.g. brittleness), cutting through the cured adhesive and the paint film to the substrate can have a big influence on the adhesion of the paint system. It is permitted, if specified or agreed between the interested parties, not to cut when the paint ISO 2016 All rights reserved 3BS EN ISO 4624:
49、2016ISO 4624:2016(E)systems are less than 150 m in layer thickness. If cuts around the dolly have been made, this shall be mentioned in the test report and the type of cutting tool shall also be mentioned.When using small dollies, cutting often is difficult and is normally not carried out. Experience has shown that an increasing number of small dollies has an advantage concerning precision compared to the cut combined with the 20 mm dollies.Dimensions in millimetres12Key1 test assembly aligned for adhesion process (see 4.3)2 centering pinFi
