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1、BRITISH STANDARD BS EN 13523-7:2001 Coil coated metals Test methods Part 7: Resistance to cracking on bending (T-bend test) The European Standard EN 13523-7:2001 has the status of a British Standard ICS 17.040.20; 25.220.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN
2、 13523-7:2001 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 March 2001 BSI 03-2001 ISBN 0 580 37260 X National foreword This British Standar
3、d is the official English language version of EN 13523-7:2001. The UK participation in its preparation was entrusted to Technical Committee STI/27, Paint systems for metallic substrates, which has the responsibility to: A list of organizations represented on this committee can be obtained on request
4、 to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the
5、BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid e
6、nquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document compr
7、ises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPEN
8、NE EUROPISCHE NORM EN 13523-7 January 2001 ICS 17.040.20; 25.220.60 English version Coil coated metals - Test methods - Part 7: Resistance to cracking on bending (T-bend test) Tles prlaques - Mthodes dessai - Partie 7: Rsistance la fissuration par pliage (essai de pliage en T) Bandbeschichtete Metal
9、le - Prfverfahren - Teil 7: Widerstandsfhigkeit gegen Rissbildung beim Biegen (T- Biegeprfung) This European Standard was approved by CEN on 30 December 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th
10、e 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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German).
11、 A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland,
12、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 200
13、1 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13523-7:2001 E Page 2 EN 13523-7:2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 139 “Paints and varnishes“, the secretariat of which is held by
14、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 July 2001, and conflicting national standards shall be withdrawn at the latest by July 2001. According to the CEN/CENELEC Internal Regulations,
15、 the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United K
16、ingdom. 1 Scope This part of EN 13523 describes the procedure for determining the resistance to cracking of an organic coating on a metallic substrate when bent through 135 to 180. The degree of adhesion may also be evaluated. Both folding and mandrel methods are considered. The folding method is mo
17、re often used for practical purposes but where more precise determinations are required, the mandrel method is recommended. The cylindrical bend method can also be used for a pass/fail decision by using an agreed mandrel. The choice of the appropriate test method is limited by the thickness and/or t
18、he hardness of the substrate. NOTE: The feasibility of the test depends on the type and thickness of the substrate. During the procedure the mandrel should not deform. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These
19、 normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated
20、 references the latest edition of the publication referred to applies (including amendments). EN 13523-0:2001 Coil coated metals Test methods Part 0: General introduction and list of test methods prEN 13523-13:1999 Coil coated metals Test methods Part 13: Resistance to accelerated ageing by the use
21、of heat EN 23270:1991 Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing (ISO 3270:1984) IEC 60454-2:1994 Specifications for pressure-sensitive adhesive tapes for electrical purposes Part 2: Methods of test 3 Terms and definitions For the purposes o
22、f this part of EN 13523, the terms and definitions given in EN 13523-0:2001 apply, together with the following. 3.1 metal thickness total thickness of the substrate including any metallic coating and excluding any organic coating. 4 Principle The coated test specimen is bent parallel to the directio
23、n of rolling through 135 to 180 over a period of 1 s to 2 s around various radii with the coating on the outside of the bend. Close contact is maintained between the test specimen and either the wedge or mandrel to ensure a uniform bend. Any bending device allowing the required smooth and uniform be
24、nding may be used. The minimum bending radius to which the specimen can be bent without cracking of the organic coating determines the resistance to cracking on bending through 135 to 180. Page 3 EN 13523-7:2001 The minimum bending radius to which the specimen can be bent without loss of adhesion de
25、termines the resistance to loss of adhesion on bending through 135 to 180. 5 Apparatus 5.1 Bending device 5.1.1 for the folding method Vice or suitable bend forming apparatus as shown in figure 1. 5.1.2 for the mandrel method Bending device, appropriate to the metal thickness, hardness, and panel si
26、ze: cylindrical mandrel: see figure 2; conical mandrel: see figure 3; conical wedge mandrel: see figure 4; the conical wedge mandrel can be driven manually (see figure 5) or pneumatically (see figure 6). 5.2 Magnifying glass 10. 5.3 Transparent pressure-sensitive adhesive tape, 25 mm wide, with an a
27、dhesion strength of (10 1) N per 25 mm width when tested in accordance with IEC 60454-2:1994. 6 Sampling See EN 13523-0:2001. Use only flat strip of such a size that the required procedure can be executed and the results obtained are representative of the end use of the material. 7 Test panels See E
28、N 13523-0:2001. Because of possible burrs, up to 5 mm on extreme edges shall be ignored during evaluation. The coating surface shall be free of oil and other foreign matter that might influence the flexibility of the coating or interfere with the observation for cracking or loss of adhesion. 8 Proce
29、dure 8.1 General Measure the resistance of the organic coating to cracking at ambient temperature. For more accurate measurements, as required for instance in the case of dispute, the temperature shall be (23 2)C and the relative humidity (50 5) %, in accordance with EN 23270:1991. The coating under
30、 test shall always be at the outside of the bend. The bending shall be carried out over a period of 1 s to 2 s. The bends shall be examined with the magnifying glass (5.2) immediately after bending. NOTE: If necessary, a second inspection may be agreed after a specified ageing (see, for example, prE
31、N 13523-13:1999) of either the flat material before bending or the bend itself. The adhesion can also be evaluated as follows: Remove two complete laps from a reel of the adhesive tape (5.3) and discard. Remove an additional length at a steady rate and cut a piece, approximately 75 mm long. Place th
32、e centre of the tape along the length of the bend and smooth the tape into place over for a distance of at least 20 mm either side with a finger. To ensure good contact with the coating, rub the tape firmly with a fingertip. The colour of the coating seen through the tape is a useful indication of o
33、verall contact. Within 5 min of applying the tape, remove the tape by holding the free end and pulling it off steadily in 0,5 s to 1 s at an angle that is as close as possible to 60 to the panel. In cases of dispute, one of the following test methods shall be agreed between the interested parties. P
34、age 4 EN 13523-7:2001 8.2 Methods for practical (industrial) use 8.2.1 Folding method The apparatus (5.1.1) shall be firmly secured near the edge of a bench, so that the handle can be operated freely. The test specimen shall be firmly clamped between the jaws of the device or vice, with the painted
35、surface to be evaluated facing downwards, or, in the case of the vice, facing the operator. The handle operating the bending plate shall be lifted smoothly over a period of 1 s to 2 s. This operation shall be repeated with the test specimen being examined immediately after each bend, with the magnif
36、ying glass (5.2). In the instance of a vice being used where no bending plate is available, even pressure shall be applied with both thumbs, to ensure a smooth and uniform bending operation (see figure 7). NOTE: This method can result in peaking of the bend. Therefore, for more precise results one o
37、f the other methods should be used. 8.2.2 Mandrel method The test specimen shall be placed on an appropriate thick and flexible rubber mat, the painted surface facing towards the rubber. Either by hand or pneumatically, either the cylindrical mandrels in decreasing radius-order or the conical wedge
38、mandrel (see figures 4, 5 and 6) shall be pressed deep enough into the rubber to ensure the proper deformation of the test specimen, with the bending parallel to the direction of rolling. For cylindrical bends mandrels having radii from 0,5 mm to 5 mm, with steps of 0,5 mm, shall be used. For a 0T-b
39、end a mandrel of radius 0,5 mm shall be used, and the resulting bend totally bent flat. 8.3 Method for laboratory purposes The coated panel shall be inserted in the apparatus in such a way that a smooth cylindrical or conical bending through 135 to 180 can be achieved. Any device that allows such a
40、smooth and uniform bending within a period of 1 s to 2 s may be used. A few examples are given in figures 1, 2 and 3. For cylindrical bends mandrels having radii from 0,5 mm to 5 mm, with steps of 0,5 mm, shall be used. For a 0T-bend a mandrel of radius 0,5 mm shall be used, and the resulting bend t
41、otally bent flat. The cylindrical bend method can also be used for a pass/fail decision by using an agreed mandrel. NOTE: The feasibility of the test depends on the type and thickness of the substrate. During the procedure the mandrel should not deform. 9 Expression of results The result shall be th
42、e minimum bending radius to which the test specimen can be bent without cracking or without loss of adhesion, expressed in T, rounded upwards to the nearest half T, for example “T no loss of adhesion“ or “1T no cracking“. See figure 7. For cylindrical bendings: Tcyl Minimum mandrel radius Metal thic
43、kness For conical bendings: Tcon Minimum mandrel radius Metal thickness NOTE: The T-expression as defined in this part of EN 13523 differs from that explained in ASTM A 4145- 83 where values are twice as high. 10 Precision Precision data are curently not available. Page 5 EN 13523-7:2001 11 Test rep
44、ort The test report shall contain at least the following information: a)all details necessary to identify the product tested, including substrate used, type of paint used, coating thickness; b)a reference to this part of EN 13523 (EN 13523-7); c)the method used: cylindrical (cyl.) or conical (con.),
45、 practical (P) or laboratory (L) test; d)the bending device used; e)the results of the test, as indicated in clause 9, specifying cracking or loss of adhesion as appropriate; f)any deviation from the test method specified; g)the date of the test. Page 6 EN 13523-7:2001 Bend forming apparatus Test pr
46、ocedure Bend forming apparatus Key A Apparatus jaws B Bending plate C Clamping screws D Test specimen 1 Direction of movement Figure 1 - Practical test (P) folding method Page 7 EN 13523-7:2001 Figure 2 - Laboratory test (L) cylindrical bend Page 8 EN 13523-7:2001 Figure 3 - Laboratory test (L) coni
47、cal bend Dimensions in millimeters NOTE: In this conical wedge mandrel, the distance between each increase of 1 mm radius is 45 mm. This distance should always be equal to or larger than 30 mm so that eventual creep of cracks does not substantially influence the test results. Figure 4 - Conical wedg
48、e mandrel Page 9 EN 13523-7:2001 Figure 5 - Practical test (P) handdriven apparatus Page 10 EN 13523-7:2001 Schematic diagram of mechanical test equipment Key 1 wedge 2 test specimen 3 rubber 4 pneumatic cylinder 6 bar Figure 6 - Practical test (P) pneumatically driven Page 11 EN 13523-7:2001 Key A
49、vice jaws B test specimen C thumb 1 direction of movement 2 T bends ECCA 3 correct 4 incorrect 5 rolling direction of coil Figure 7 - T-bend test Page 12 EN 13523-7:2001 Bibliography EN 1396:1996Aluminium and aluminium alloys Coil coated sheet and strip for general applications Specifications EN 10169-1:1996Continuously organic coated (coil coated) steel flat products Part 1: General information (definitions, materials, tolerances, test methods) ENV 10169-2:1999Continuously organic coated (coil coated) stee
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