1、BS EN ISO17132:2007ICS 87.040NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPaints and varnishes T-bend test (ISO17132:2007)This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 July 2008 BSI 2008ISBN 978 0 580
2、 56827 5Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 17132:2007National forewordThis British Standard is the UK implementation of EN ISO 17132:2007.The UK participation in its preparation was entrusted to TechnicalCommittee STI/10, Test methods for paints.A list of organizati
3、ons represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROP
4、EAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 17132October 2007ICS 87.040English VersionPaints and varnishes - T-bend test (ISO 17132:2007)Peintures et vernis - Essai de pliage en T (ISO17132:2007)Beschichtungsstoffe - T-Biegeprfung (ISO 17132:2007)This European Standard was approved by CEN on 30
5、 September 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be
6、 obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Man
7、agement Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
8、ay, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and
9、 by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 17132:2007: EBS EN ISO 17132:2007EN ISO 17132:2007 (E) 3 Foreword This document (EN ISO 17132:2007) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee CEN/TC 139
10、“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 April 2008, and conflicting national standards shall be withdrawn at the latest by
11、April 2008. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irel
12、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 17132:2007 has been approved by CEN as a EN ISO 17132:2007 without any modification. BS EN ISO 1
13、7132:2007ISO 17132:2007(E) ISO 2007 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 3 Terms and definitions .1 4 Principle1 5 Apparatus .2 6 Sampling.2 7 Test panels .2 7.1 Substrate 2 7.2 Preparation and coating2 7.3 Thickness of the coating.2 8 Pr
14、ocedure .2 8.1 Conditioning of the test panels 2 8.2 Test conditions 2 8.3 Bending.3 8.4 Evaluation.5 8.5 T-bend test as a pass/fail test.5 9 Supplementary information5 10 Expression of results 5 11 Precision.6 11.1 General6 11.2 Repeatability, r .6 11.3 Reproducibility, R.6 12 Test report 6 Annex A
15、 (informative) Correlation between the ISO rating system and other systems 7 Bibliography 8 BS EN ISO 17132:2007ISO 17132:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies
16、). 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 committee. International organizations, governmental and no
17、n-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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Par
18、t 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting
19、 a vote. 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. ISO 17132 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
20、SC 9, General test methods for paints and varnishes. BS EN ISO 17132:2007ISO 17132:2007(E) ISO 2007 All rights reserved vIntroduction This International Standard is one of five standards which specify empirical test procedures for assessing the resistance of coatings of paints, varnishes and related
21、 products to cracking and/or detachment from the substrate under different conditions of deformation. The other International Standards are ISO 1519, ISO 1520, ISO 6272 and ISO 6860. The T-bend test has already been standardized in the USA (ASTM D 4145), Europe (EN 13523-7) and Japan (JIS G 3312). T
22、he test methods in these standards are basically the same, but differ from each other in details such as whether the coated test panel is folded back on itself or is bent round a mandrel or a test panel used as a spacer; the way in which the test result is expressed. In this International Standard,
23、the basic contents common to the US, European and Japanese standards have been adopted, but details in which the US, European and Japanese standards differ, in particular the use of a mandrel or spacer panels, have been made subject to agreement between the interested parties. BS EN ISO 17132:2007BS
24、 EN ISO 17132:2007INTERNATIONAL STANDARD ISO 17132:2007(E) ISO 2007 All rights reserved 1Paints and varnishes T-bend test 1 Scope This International Standard describes a method of evaluating the flexibility and adhesion of an organic coating on a metallic substrate by observing the cracking or loss
25、of adhesion when a coated test panel is bent. The method can be used to confirm whether paints, varnishes or related products meet a given test requirement in a pass/fail test, or to determine the minimum bending diameter at which cracking does not occur. 2 Normative references The following referen
26、ced documents are indispensable for the application of this document. 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 samples
27、for testing ISO 1514, Paints and varnishes Standard panels for testing ISO 2808, Paints and varnishes Determination of film thickness ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling IEC 60454-2, Specification for pressure-sensitive adhesive tapes for electrical purpo
28、ses Part 2: Methods of test 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 T-bend test test designed to determine the flexibility of a paint coating by bending a coated test panel through 180 3.2 T-bend rating minimum number of spacers of de
29、fined thickness around which a coated test panel can be bent (or, if bent around a mandrel, the number of spacers equivalent to the diameter of the mandrel) without cracking or loss of adhesion (flaking) of the coating occurring 4 Principle Coated panels are bent back on themselves to 180, with the
30、coated surface on the outside of the bend, at progressively less severe radii of curvature, the radii of curvature being defined by spacers or mandrels. After bending, each panel is examined with a magnifying glass for cracking of the coating and by a tape pull-off test BS EN ISO 17132:2007ISO 17132
31、:2007(E) 2 ISO 2007 All rights reservedfor loss of adhesion of the coating. The minimum diameter to which the test panel can be bent without cracking or loss of adhesion, i.e. when failures no longer occur, is taken as the T-bend rating. Visual examination with a magnifying glass can also be used to
32、 determine whether there is any loss of adhesion. 5 Apparatus 5.1 Vice, with flat and smooth jaws. This is used to hold one end of the test piece firmly in place at the start of the bending test. If the test panel is not bent around itself, a series of bending mandrels with smoothly rounded ends may
33、 be used as guides around which the test panel is bent (see Figure 1). By agreement between the interested parties, one or more uncoated panels may also be used as mandrels. 5.2 Magnifying glass, 5 to 10 magnification. 5.3 Adhesive tape, with an adhesive strength between 6 N/25 mm width and 10 N/25
34、mm width when determined in accordance with IEC 60454-2. 6 Sampling Take a representative sample of the product to be tested, as described in ISO 15528. Examine and prepare each sample for testing, as described in ISO 1513. 7 Test panels 7.1 Substrate Unless otherwise agreed, use rectangular steel t
35、est panels. The panel surfaces shall be plane. 7.2 Preparation and coating Unless otherwise agreed, prepare each test panel in accordance with ISO 1514 before coating it using the specified application method (see Clause 9) and drying, curing or stoving. 7.3 Thickness of the coating Determine the th
36、ickness, in micrometres, of the dry coating by one of the procedures given in ISO 2808. 8 Procedure 8.1 Conditioning of the test panels Unless otherwise agreed, condition the coated test panels for at least 16 h at (23 2) C and (50 5) % relative humidity before carrying out the test. 8.2 Test condit
37、ions Unless otherwise agreed, carry out the test at (23 2) C and (50 5) % relative humidity. BS EN ISO 17132:2007ISO 17132:2007(E) ISO 2007 All rights reserved 38.3 Bending 8.3.1 General The bending shall be performed in accordance with one of the procedures given in 8.3.2, 8.3.3 and 8.3.4, as agree
38、d between the interested parties. Unless otherwise agreed, the bend shall be across the direction of rolling of the panel, except for coil coatings in which case the test panel shall be bent parallel to the direction of rolling. No bends shall be made closer than 10 mm to the jaws of the vice. 8.3.2
39、 T-bend test around a mandrel Clamp a coated test panel and a mandrel in the vice. Then bend the panel 180 around the mandrel (see Figure 1) in a smooth and uniform manner with the coated side of the panel on the outside of the bend. Figure 1 Bending around a mandrel Examine the bend for cracking an
40、d for loss of adhesion as described in 8.4. Repeat the bending procedure, using a new test panel and a different size of mandrel each time, to determine the minimum mandrel thickness at which no cracking or loss of adhesion occurs. Express the T-bend rating, Tm, as the number of panel thicknesses eq
41、uivalent to the thickness of the narrowest mandrel around which the test panel could be bent without cracking or loss of adhesion occurring, reporting the result as 1 Tmfor one panel thickness, 2 Tmfor two panel thicknesses, etc. (see also Table A.1). 8.3.3 T-bend test with spacer panels Clamp one e
42、nd of a coated test panel in the vice and bend it with the coated side of the panel on the outside of the bend. Remove the panel from the vice and bend it further with the fingers until it can be placed in the vice again. Insert one or more uncoated panels as spacers inside the bent panel as shown i
43、n Figure 2, fasten the assembly in the vice and bend it quickly to an angle of 180. Each spacer panel shall have the same thickness as the test panel. Examine the bend for cracking and loss of adhesion as described in 8.4. Repeat the bending procedure, using a new test panel and a different number o
44、f spacers each time, to determine the smallest number of spacers at which no cracking or loss of adhesion occurs. Express the T-bend rating, Tp, as the minimum number of spacers around which the test panel could be bent without cracking or loss of adhesion occurring, reporting the result as 1 Tpfor
45、one spacer, 2 Tpfor two spacers, etc. (see also Table A.1). BS EN ISO 17132:2007ISO 17132:2007(E) 4 ISO 2007 All rights reserveda) 1 Tpb) 2 TpFigure 2 Bending with spacers 8.3.4 T-bend test with test panel repeatedly folded back on itself (folding method) Clamp one end of a coated test panel in the
46、vice and bend it through 90 in a smooth and uniform manner with the coated side of the panel on the outside of the bend. Continue to bend the panel until the bent end can be inserted in the jaws of the vice (see Figure 3). Tighten the vice to complete the 180 bend. Take care to tighten the vice suff
47、iciently so that the surfaces on the inside of the bend are as closely in contact as possible. Examine the bend for cracking and loss of adhesion as described in 8.4. If cracking or loss of adhesion has occurred, repeat the bending procedure, as shown in Figure 3, until no cracking or loss of adhesi
48、on occurs. Express the T-bend rating, Tf, as the number of bends, after the initial bend, which could be made in the test panel before no cracking or loss of adhesion occurred, reporting the result as 0 Tffor no bends after the initial one, 1 Tffor one bend after the initial one, etc. (see also Tabl
49、e A.1). If it is agreed to use test panels in the shape of a right-angled triangle, the lengths of two sides should preferably be equal and in the range 10 cm to 15 cm. This shape leaves part of each bend exposed for later examination and for a permanent record. a) 0 Tfb) 1 Tfc) 2 Tfd) 3 Tfe) 4 TfFigure 3 Folding method BS EN ISO 17132:2007ISO 17132:2007(E) ISO 2007 All rights reserved 58.4 Evaluation Examine the bend, using the magnifying glass (5.2), immediately after bending for any cracking. Disregar
