1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 12137:2011Incorporating corrigendum November 2011Paints and varnishes Determination of mar r e s i s t a n c e ( I S O 1 2 1 3 7 : 2 0 1 1 )BS EN ISO 12137:2011 BRITISH
2、 STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 12137:2011. It supersedes BS EN ISO 12137-1:2006 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on t
3、his committee can be 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. BSI 2011 ISBN 978 0 580 77245 0 ICS 87.040 Compliance with a British Standard cannot confer immunity f
4、rom legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate Text affected31 December 2011 Implementation of CEN Correction Notice9 November 2011: Corrected supersessioninforma
5、tion in EN ForewordEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12137 October 2011 ICS 87.040 Supersedes EN ISO 12137-1:2006English Version Paints and varnishes - Determination of mar resistance (ISO 12137:2011) Peintures et vernis - Dtermination de la rsistance la dtrioration (ISO 12137
6、:2011) Beschichtungsstoffe - Bestimmung der Bestndigkeit gegen Verkratzen (ISO 12137:2011) This European Standard was approved by CEN on 14 October 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the sta
7、tus 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 versions (English, French, G
8、erman). 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 Austria, Belgium, Bulgaria, Croa
9、tia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, 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 STANDARDI
10、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12137:2011: E3 Foreword This document (EN ISO 12137:
11、2011) 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 of a national standard, either by publication of an id
12、entical text or by endorsement, at the latest by April 2012, and conflicting national standards shall be withdrawn at the latest by April 2012. 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 r
13、esponsible for identifying any or all such patent rights. This document supersedes EN ISO 12137-1:2006. 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, Croati
14、a, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of
15、 ISO 12137:2011 has been approved by CEN as a EN ISO 12137:2011 without any modification. BS EN ISO 12137:2011 EN ISO 12137:2011 (E)INTERNATIONAL STANDARD ISO 2011 1Paints and varnishes Determination of mar resistance 1 Scope This International Standard specifies a method for determining, using a cu
16、rved (loop-shaped or ring-shaped) stylus, the mar resistance of a single coating of a paint, varnish or related product, or the upper layer of a multicoat system. This test has been found to be useful in comparing the mar resistance of different coatings. It is most useful in providing relative rati
17、ngs for a series of coated panels exhibiting significant differences in mar resistance. This International Standard does not specify a method using a pointed stylus, two of which are specified in ISO 1518-1 and ISO 1518-2, respectively. The choice between the three methods will depend on the particu
18、lar practical problem. 2 Normative references The following 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
19、 1513, Paints and varnishes Examination and preparation of test samples 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 3 Terms and definitions F
20、or the purposes of this document, the following terms and definitions apply. 3.1 mar, n blemish on the surface of a coating, extending over a particular area of the coating and visible due to the difference in the light-reflection properties of the area affected compared with the light-reflection pr
21、operties of adjacent areas 4 Principle The product or system under test is applied at uniform thickness to flat panels of uniform surface texture. After drying/curing, the mar resistance is determined by pushing the panels beneath a curved (loop-shaped or ring-shaped) stylus which is mounted so that
22、 it presses down on the surface of the test panel at an angle of 45. The load on the test panel is increased in steps until the coating is marred. EN ISO 12137:2011 (E)BS EN ISO 12137:2011 2 ISO 2011 5 Apparatus 5.1 Instrument for determining mar resistance. A suitable instrument is shown in Figure
23、1. It consists principally of a counterbalanced beam with a small scale pan on which weights can be placed to load the stylus. The stylus is mounted at the lower end of a rod which extends down from the beam at a fixed angle of 45. The test panel is placed on a sliding table which can be pushed unde
24、r the stylus, preferably by the use of mechanical equipment. The instrument shall be designed so that tests can be performed with stylus loadings of up to 5 kg and so that the load can be increased or decreased in steps of 0,5 kg, or in steps of 0,25 kg or 0,1 kg when greater accuracy is required ne
25、ar the mar point. Key 1 counterweight 4 beam release 2 main bearing support 5 weight 3 level indicator 6 direction of test Other types of mar instrument may be used if they give similar relative ratings. For instance, the scratch apparatus specified in ISO 1518-1 is suitable with some modifications.
26、 Figure 1 Balanced-beam mar-resistance instrument BS EN ISO 12137:2011 EN ISO 12137:2011 (E) ISO 2011 35.2 Loop-shaped or ring-shaped stylus. The loop-shaped stylus shall be made of chromium-plated steel and shall be in the form of a rod of 1,6 mm diameter bent into a “U” shape with an outside radiu
27、s of (3,25 0,05) mm see Figure 2 a). In each case, the stylus shall be hardened to Rockwell HRC56 to HRC58 and its surface shall be smooth (roughness 0,05 m). 5.3 Microscope, preferably with a magnification range extending up to 50. Dimensions in millimetres a) Loop-shaped stylus b) Ring-shaped styl
28、us Figure 2 Details of styluses 6 Sampling Take a representative sample of the product to be tested (or of each product in the case of a multicoat system), as specified in ISO 15528. Examine and prepare each sample for testing, as specified in ISO 1513. BS EN ISO 12137:2011 EN ISO 12137:2011 (E)4 IS
29、O 20117 Test panels 7.1 Substrate Select the substrate from one of those specified in ISO 1514 and, where possible, in accordance with the desired practical application. The panels shall be plane and free from distortion, with a maximum thickness of about 12 mm, and 100 mm to 400 mm wide and long. 7
30、.2 Preparation and coating Prepare each test panel in accordance with ISO 1514 and then coat it by the specified method with the product or system under test. 7.3 Drying and conditioning Dry (or stove) and age, if applicable, each coated test panel according to the instructions given for the product
31、 or system under test. Before testing, condition the coated panels at (23 2) C and a relative humidity of (50 5) % for a minimum period of 16 h. The coated panels shall be stored and handled so as to avoid contamination by fingerprints and dust. NOTE Fingerprints, dust or other contamination on the
32、surface will result in a lower accuracy. 7.4 Thickness of coating Determine the thickness, in micrometres, of the dried coating by one of the procedures specified in ISO 2808. 8 Procedure 8.1 Test conditions Carry out the test at (23 2) C and a relative humidity of (50 5) %, unless otherwise agreed.
33、 8.2 Preparation for the test Ensure that the instrument is level, and place it so that the end with the weight pan is nearest the operator. In the case of the instrument shown in Figure 1, the beam release switch will now be on the operators right. Insert the stylus in the holder and tighten the cl
34、amping screw. Both sides of the loop-shaped stylus can be used. Examine the stylus periodically to ensure that it has a smooth surface without any scratches. If the contacting surface is worn, turn the loop over. When both sides are worn, replace the loop by a new one. If the ring-shaped stylus is u
35、sed, examine it periodically in the same way and, when the contact point is worn, rotate it so that an unworn area is in contact with the panel. When all the ring is worn, replace it by a new one. Adjust the main bearing support so that the beam is balanced in the horizontal plane when the stylus is
36、 just touching the panel surface. The alignment of the beam shall be such that the middle of the stylus is over the centreline of the sliding table. Raise the beam and lock it in the raised position. Clean the stylus, if necessary, with a clean cloth or lint-free paper. BS EN ISO 12137:2011 EN ISO 1
37、2137:2011 (E) ISO 2011 58.3 Determination Place a test panel up against the stop on the sliding table. Place a weight on the scale pan, starting at a weight somewhat less than that expected to cause marring of the paint surface. Release the beam slowly and carefully (it is very important to carry ou
38、t this operation with great care). Immediately after the stylus has come to rest on the coating, push the sliding table towards the far end of the instrument (i.e. away from the operator) at a rate of about 3 mm/s to 6 mm/s for a distance of 75 mm at least. Inspect the coating for marring under a su
39、itable magnification or with the naked eye. If no marring occurs with the initial load, continue the test, using larger loads, in test areas that do not overlap, increasing the load in 0,5 kg increments until marring does occur. If marring occurs with the initial load, continue the test using smalle
40、r loads, decreasing the load in 0,5 kg decrements until the coating is no longer marred. Determine which type of defect is involved. The defects are defined as follows: a) Plastic deformation: the permanent indentation of the surface with or without any surface blemish or cohesive fracture. b) Surfa
41、ce blemish: a superficial surface effect caused by a difference in the scattering of light between the line of test and the adjacent surface. c) Surface scratch: a continuous cut or gouge through the surface. d) Cohesive fracture: a visible surface break or rupture. e) Combinations of the above. NOT
42、E In some cases, one of these types of defect might be of particular importance. When the critical load (that at which marring just occurs) has been approximately located, repeat the test five times at each of the following three loadings: 0,5 kg above the critical load, 0,5 kg below the critical lo
43、ad and at the critical load. To obtain higher accuracy, smaller increments and decrements may be used (e.g. 0,25 kg or 0,1 kg). For each load at or near the critical load, record the number of times the coating was marred. The minimum load which causes marring is that load at which at least two of t
44、he five determinations resulted in marring of the coating. 9 Precision No relevant precision data are currently available. 10 Test report The test report shall contain at least the following information: a) all details necessary to identify the product tested; b) a reference to this International St
45、andard (ISO 12137:2011); BS EN ISO 12137:2011 EN ISO 12137:2011 (E)6 ISO 2011c) all details on preparation of the test panels, including 1) the material (including thickness) and surface preparation of the substrate (see 7.1), 2) the method of application of the test coating to the substrate (see 7.
46、2), 3) the duration and conditions of drying (or stoving) and ageing (if applicable) of the coating before testing (see 7.3), 4) the thickness, in micrometres, of the dry coating and method of measurement in accordance with ISO 2808, and whether it is a single coating or a multicoat system (see 7.4)
47、; d) the temperature and relative humidity during the test, if different from those specified in 8.1; e) the type of apparatus used; f) the type of stylus used; g) the size of the increment/decrement used in the region of the critical load; h) whether marring was assessed using the naked eye or a mi
48、croscope and, if a microscope was used, the magnification setting at which it was used; i) the test results: 1) a description of those of the elements of marring defined in 8.3 which actually occurred (not all will necessarily occur), 2) the minimum load at which each of these elements of marring oc
49、curred; j) any deviation from the test method specified; k) any unusual features (anomalies) observed during the test; l) the date of the test. BS EN ISO 12137:2011 EN ISO 12137:2011 (E) ISO 2011 7Bibliography 1 ISO 1518-1, Paints and varnishes Determination of scratch resistance Part 1: Constant-loading method 2 ISO 1518-2, Paints and varnishes Determination of scratch resistance Part 2: Variable-loading method BS EN ISO 12137:2011 EN ISO 12137:2011 (E)This page deliberately left blankThis page deliberately le
