1、January 2008DEUTSCHE NORM English price group 10No part of this standard 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!$K:H“1402337www
2、.din.deDDIN EN ISO 17132Paints and varnishes T-bend test (ISO 17132:2007)English version of DIN EN ISO 17132:2008-01Beschichtungsstoffe T-Biegeprfung (ISO 17132:2007)Englische Fassung DIN EN ISO 17132:2008-01www.beuth.deDocument comprises 14 pagesDIN EN ISO 17132:2008-01 2 National foreword This sta
3、ndard falls in the domain of Technical Committee CEN/TC 139 “Paints and varnishes” (Secretariat: DIN, Germany). It is identical with International Standard ISO 17132 which was prepared by ISO/TC 35/SC 9 “General test methods for paints and varnishes” (Secretariat: BSI, United Kingdom). The responsib
4、le German body involved in its preparation was the Normenausschuss Beschichtungsstoffe und Beschichtungen (Coatings and Coating Materials Standards Committee), Technical Committee NA 002-00-07 AA Allgemeine Prfverfahren fr Beschichtungsstoffe und Beschichtungen. The DIN Standards corresponding to th
5、e International Standards referred to in the EN are as follows: ISO 1513 DIN EN ISO 1513 ISO 1514 DIN EN ISO 1514 ISO 1519 DIN EN ISO 1519 ISO 1520 DIN EN ISO 1520 ISO 2808 DIN EN ISO 2808 ISO 6272-1 DIN EN ISO 6272-1 ISO 6272-2 DIN EN ISO 6272-2 ISO 6860 DIN EN ISO 6860 ISO 15528 DIN EN ISO 15528 I
6、EC 60454-2 DIN EN ISO 60454-2 (VDE 0340-2) National Annex NA (informative) Bibliography DIN EN 60454-2 (VDE 0340-2), Specification for pressure-sensitive adhesive tapes for electrical purposes Part 2: Methods of test DIN EN ISO 1513, Paints and varnishes Examination and preparation of samples for te
7、sting DIN EN ISO 1514, Paints and varnishes Standard panels for testing DIN EN ISO 1519, Paints and varnishes Bend test (cylindrical mandrel) DIN EN ISO 1520, Paints and varnishes Cupping test DIN EN ISO 2808, Paints and varnishes Determination of film thickness DIN EN ISO 6272-1, Paints and varnish
8、es Rapid-deformation (impact resistance) tests Part 1: Falling-weight test, large-area indenter DIN EN ISO 6272-2, Paints and varnishes Rapid-deformation (impact resistance) tests Part 2: Falling-weight test, small-area indenter DIN EN ISO 6860, Paints and varnishes Bend test (conical mandrel) DIN E
9、N ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17132 October 2007 ICS 87.040 English Version Paints and varnishes - T-bend test (ISO 17132:2007) Peintures et vernis - Essai de pliage en T (ISO 17132:2007) Be
10、schichtungsstoffe - T-Biegeprfung (ISO 17132:2007) This European Standard was approved by CEN on 30 September 2007. 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
11、 alteration. Up-to-date lists and bibliographical references concerning such national standards may be 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 b
12、y translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
13、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NOR
14、MUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17132:2007: EContents Page 2 EN ISO 17132:2007 (E) :Foreword . 3 Introduction 4 1 Scope . 5 2 Normative references
15、 . 5 3 Terms and definitions 5 4 Principle . 5 5 Apparatus 6 6 Sampling 6 7 Test panels 6 7.1 Substrate . 6 7.2 Preparation and coating . 6 7.3 Thickness of the coating 6 8 Procedure 6 8.1 Conditioning of the test panels . 6 8.2 Test conditions . 6 8.3 Bending 7 8.4 Evaluation 9 8.5 T-bend test as a
16、 pass/fail test . 9 9 Supplementary information . 9 10 Expression of results . 9 11 Precision . 10 11.1 General 10 11.2 Repeatability, r . 10 11.3 Reproducibility, R . 10 12 Test report 10 Annex A (informative) Correlation between the ISO rating system and other systems 11 Bibliography 12 DIN EN ISO
17、 17132:2008-01 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 “Paints and varnishes“, the secretariat of which is held by DIN. This European Standard shall be given the status o
18、f 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 April 2008. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followin
19、g countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloveni
20、a, 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. 3 EN ISO 17132:2007 (E) DIN EN ISO 17132:2008-01 Introduction This International Standard is one of five standards which speci
21、fy empirical test procedures for assessing the resistance of coatings of paints, varnishes and related 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
22、 has already been standardized in the USA (ASTM D 4145), Europe (EN 13523-7) and Japan (JIS G 3312). The 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 p
23、anel used as a spacer; the way in which the test result is expressed. In this International Standard, 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 spa
24、cer panels, have been made subject to agreement between the interested parties. 4 EN ISO 17132:2007 (E) DIN EN ISO 17132:2008-01 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 o
25、r loss 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
26、referenced 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 s
27、amples 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 electrica
28、l purposes 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 spacer
29、s of defined 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, wi
30、th the 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 5 EN ISO 17132:2007 (E
31、)DIN EN ISO 17132:2008-01 for 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 determine wh
32、ether 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 be used as g
33、uides 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 mm width when
34、 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 test panels. T
35、he 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 thickness, in m
36、icrometres, 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 conditions Unless o
37、therwise agreed, carry out the test at (23 2) C and (50 5) % relative humidity. 6 EN ISO 17132:2007 (E) DIN EN ISO 17132:2008-01 8.3 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 agreed between the interested parties
38、. 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 T-bend test around a mandrel Cl
39、amp 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 and for loss of adhesion as descri
40、bed 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 equivalent to the thickness of the
41、 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 end of a coated test panel in the
42、 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 in Figure 2, fasten the assembly
43、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 of spacers each time, to determin
44、e 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 one spacer, 2 Tpfor two spacers,
45、 etc. (see also Table A.1). 7 EN ISO 17132:2007 (E)DIN EN ISO 17132:2008-01 a) 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 vice and bend it through 90 in a smooth and uniform
46、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 sufficiently so that the surfaces on the inside of the b
47、end 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 adhesion occurs. Express the T-bend rating, Tf, as the num
48、ber 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 Table A.1). If it is agreed to use test panels in the sh
49、ape 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 8 EN ISO 17132:2007 (E) DIN EN ISO 17132:2008-01 8.4 Evaluation Examine the bend, using the magnifying glass (5.2), immediately after bending for any cracking. Disregard those parts of the bend within 5 mm of each edge of the
