1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 6272-2:2011Paints and varnishes Rapid-deformation (impact resistance) testsPart 2: Falling-weight test, small-area indenter (ISO 6272-2:2011)BS EN ISO 6272-2:2011 BRITI
2、SH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 6272-2:2011. It supersedes BS EN ISO 6272-2:2006,which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e S T I / 1 0 , T e s t m e t h o d s f o r p a i n t s
3、.A list of organizations represented on this 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 68539 2 ICS 87.040 Compliance with a
4、British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2011.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
5、ISO 6272-2 August 2011 ICS 87.040 Supersedes EN ISO 6272-2:2006English Version Paints and varnishes - Rapid-deformation (impact resistance) tests - Part 2: Falling-weight test, small-area indenter (ISO 6272-2:2011) Peintures et vernis - Essais de dformation rapide (rsistance au choc) - Partie 2: Ess
6、ai de chute dune masseavec pntrateur de surface rduite (ISO 6272-2:2011) Beschichtungsstoffe - Prfung der Widerstandsfhigkeit bei schlagartiger Verformung (Schlagfestigkeit) - Teil 2: Prfung durch fallendes Gewichtsstck, kleine Prfflche (ISO 6272-2:2011) This European Standard was approved by CEN on
7、 13 August 2011. 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 alteration. Up-to-date lists and bibliographical references concerning such national standards may
8、 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, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified t
9、o the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lux
10、embourg, 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 NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All ri
11、ghts of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6272-2:2011: EBS EN ISO 6272-2:2011 EN ISO 6272-2:2011 (E) 3 Foreword This document (EN ISO 6272-2:2011) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collabo
12、ration 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 identical text or by endorsement, at the latest by February 2012, and conflicting national s
13、tandards shall be withdrawn at the latest by February 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 responsible for identifying any or all such patent rights. This document supersedes E
14、N ISO 6272-2:2006. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungar
15、y, 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 ISO 6272-2:2011 has been approved by CEN as a EN ISO 6272-2:2011 without any modific
16、ation. BS EN ISO 6272-2:2011ISO 6272-2:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Principle1 4 Apparatus.2 5 Reagents.2 6 Sampling.2 7 Test panels.2 8 Procedure.4 9 Precision.5 10 Test report5 BS EN ISO 6272-2:2011ISO 6272-2:2011(E) iv ISO 20
17、11 All rights reservedForeword ISO (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 interested in a
18、 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 Electrotechnical Commissio
19、n (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical co
20、mmittees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting 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 no
21、t be held responsible for identifying any or all such patent rights. ISO 6272-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes. This second edition cancels and replaces the first edition (ISO 6272-2:2002), which h
22、as been technically revised. The main technical changes are: a) all non-SI units have been deleted; b) the definition has been deleted because the term “impact” is incorrect for this test; c) a figure showing the test apparatus has been added; d) the test is no longer carried out at a specified rela
23、tive humidity; instead, the relative humidity is simply recorded but the test has to be completed within a specified length of time after conditioning the test panels; e) a pin-hole detector is no longer used to detect holes in the coating under test; f) the precision data have been deleted because
24、the method is slightly different from the ASTM method to which the precision data applied; g) the supplementary test conditions (formerly Annex A) have been incorporated in the test report. ISO 6272 consists of the following parts, under the general title Paints and varnishes Rapid-deformation (impa
25、ct resistance) tests: Part 1: Falling-weight test, large-area indenter Part 2: Falling-weight test, small-area indenter BS EN ISO 6272-2:2011INTERNATIONAL STANDARD ISO 6272-2:2011(E) ISO 2011 All rights reserved 1Paints and varnishes Rapid-deformation (impact resistance) tests Part 2: Falling-weight
26、 test, small-area indenter 1 Scope This part of ISO 6272 describes a method for evaluating the resistance of a dry film of paint, varnish or related product to cracking or peeling from a substrate when it is subjected to a deformation caused by a falling weight, dropped under standard conditions, ac
27、ting on a small-area spherical indenter. NOTE The terms “impact” and “impact resistance” are used in the title and text of this part of ISO 6272, but an important characteristic of the apparatus used is that it should produce rapid deformation rather than a true impact. Because of the poor reproduci
28、bility of this test method, the method should be restricted to testing in only one laboratory when the results are expressed as numerical values. Interlaboratory agreement is improved when ranking is used in place of numerical values. 2 Normative references The following referenced documents are ind
29、ispensable 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 test samples ISO 1514, Paints
30、 and varnishes Standard panels for testing ISO 2808, Paints and varnishes Determination of film thickness ISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing ISO 13076, Paints and varnishes Lighting and procedure for visual assessments ISO
31、15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3 Principle The coating under test is applied to suitable thin metal panels. After the coatings have cured, a standard weight is dropped a distance so as to strike an indenter that deforms the coating and the substrate. The
32、 test can be carried out with the coated side of the panel facing upwards (i.e. towards the falling weight and indentor) or downwards (i.e. away from the weight and indentor). By gradually increasing the distance the weight drops, the point at which failure occurs can be determined. Films generally
33、fail by cracking, which is made more visible by the use of a magnifier or, on steel, by the application of a copper sulfate solution. BS EN ISO 6272-2:2011ISO 6272-2:2011(E) 2 ISO 2011 All rights reserved4 Apparatus 4.1 Falling-weight apparatus (see Figure 1), consisting basically of a vertical tube
34、 to guide a cylindrical weight that is dropped on an indenter resting on the test panel and including the components described in 4.1.1 to 4.1.4. 4.1.1 Guide tube, 0,6 m to 1,2 m long, mounted vertically on a baseplate. A slot is cut lengthwise on one side of the tube to act as a guide for a cylindr
35、ical weight that fits inside the tube. Graduations are marked in millimetres along the slot. The base is constructed so that a thin flat panel can be inserted 50 mm below the tube. 4.1.2 Weight, consisting of a metal cylinder made to fit inside the guide tube. A pin is fitted into one side of the we
36、ight to act as a guide by riding in the slot in the tube, to serve as a handle by which the weight can be raised and released and to indicate the height in millimetres. The mass of the weight is either (1 000 10) g or (2 000 20) g. To avoid excessive friction and to ensure accurate guidance, the dif
37、ference between the inner diameter of the guide tube and the outer diameter of the falling weight shall be (1 0,2) mm. 4.1.3 Indenter, made of hardened steel (55 HRC to 60 HRC), with a mass of (150 15) g and with a hemispherical head having a diameter of either (12,7 0,06) mm or (15,9 0,06) mm. The
38、head rests on the test panel and the indenter is held vertically by a guide ring. To avoid excessive friction and to ensure accurate guidance, the difference between the inner diameter of the guide ring and the outer diameter of the indenter shall be (0,1 0,05) mm. 4.1.4 Panel support, consisting of
39、 a steel fixture with a cylindrical hole of diameter (16,3 0,1) mm centred under the indenter to support the test panel. 4.2 Viewing lens, with a magnification of 10. 5 Reagents 5.1 Acidified copper sulfate (CuSO4) solution, prepared by dissolving 10 g of CuSO45 H2O in 90 g of hydrochloric acid, c(H
40、CI) = 1,0 mol/l. 6 Sampling Take a representative sample of the coating material to be tested (or of each product in the case of a multi-coat system), as described in ISO 15528. Examine and prepare each sample for testing, as described in ISO 1513. 7 Test panels 7.1 Substrate The substrate shall be
41、metal, conforming to the requirements of ISO 1514. The panels shall be planar, free from distortion and at least 0,25 mm thick. The dimensions shall be such as to allow the test to be carried out at at least five different positions not less than 40 mm from each other and not less than 20 mm from th
42、e edge of the panel. Measure the thickness to the nearest 0,01 mm. BS EN ISO 6272-2:2011ISO 6272-2:2011(E) ISO 2011 All rights reserved 3Dimensions in millimetres Key 1 guide tube 2 weight 3 indenter, nose diameter 15,9 mm 4 indenter, nose diameter 12,7 mm 5 panel support 6 guide ring Figure 1 Falli
43、ng-weight apparatus showing required dimensions 7.2 Preparation and coating Prepare each test panel (7.1) in accordance with ISO 1514 and then coat it by the method specified by the manufacturer of the product or system under test to give the dry-film thickness specified by the manufacturer, or coat
44、 it by a method agreed upon between the interested parties to give a dry-film thickness agreed upon between the interested parties. The coating method and dry-film thickness used shall be included in the test report see Clause 10, items c) 2) and c) 4). BS EN ISO 6272-2:2011ISO 6272-2:2011(E) 4 ISO
45、2011 All rights reserved7.3 Drying Dry (or stove) and age (if applicable) each coated test panel for the time, and under the conditions, specified by the manufacturer of the product or system under test, or as agreed between the interested parties. The time and conditions used shall be included in t
46、he test report see Clause 10, item c) 3). 7.4 Thickness of coating Determine the thickness, in micrometres, of the dried coating by one of the procedures specified in ISO 2808. Make the measurements at, or as near as possible to, the positions at which the test is to be carried out. Use only test pa
47、nels for which the film thickness values do not differ from the specified or agreed film thickness by more than 10 %. 8 Procedure 8.1 General Before testing, condition the coated panels at a temperature of (23 2) C and a relative humidity of (50 5) % (or at another temperature and humidity, agreed b
48、etween the interested parties, from those specified in ISO 3270) for a minimum period of 16 h. Begin the test procedure as soon as possible after conditioning, but in any case complete it not later than 30 min after removal of the test panels from conditioning. Mount the apparatus on a firm surface
49、(for example, concrete, steel or stone). Carry out the test at (23 2) C or at another temperature, agreed between the interested parties, from those specified in ISO 3270. State the test temperature at which the test was carried out in the test report. Measure the relative humidity during the test and state it in the test report. 8.2 Classification test (to determine the minimum drop height which will cause cracking or peeling) Install the indenter having the head diameter specified or agreed
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