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1、BRITISH STANDARD BS ISO 20567-2:2005 Paints and varnishes Determination of stone-chip resistance of coatings Part 2: Single-impact test with a guided impact body ICS 87.040 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20567-2:200
2、5 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 April 2005 BSI 8 April 2005 ISBN 0 580 45736 2 National foreword This British Standard reproduces verbatim ISO 20567-2:2005 and implements it as the UK national standard. The UK participatio
3、n in its preparation was entrusted to Technical Committee STI/10, Test methods for paints, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publicat
4、ions referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necess
5、ary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interp
6、retation, 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 comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 8,
7、an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
8、 Reference number ISO 20567-2:2005(E) OSI 5002 INTERNATIONAL STANDARD ISO 20567-2 First edition 2005-02-15 Paints and varnishes Determination of stone-chip resistance of coatings Part 2: Single-impact test with a guided impact body Peintures et vernis Dtermination de la rsistance des revtements aux
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14、02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.o gr We bwww.is.o gro Pulbisdehi n Switlrez dna ii ISO 5002 Allr ithgsr esedevr BS ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) I
15、SO 5002 All irthgs ersedevr iii Contents Page Forewordiv Introduction v 1 Scope 1 2 Normative references . 1 3 Principle. 1 4 Apparatus and materials 2 5 Sampling 2 6 Test panels 2 7 Procedure 4 8 Evaluation 5 9 Precision 6 10 Test report . 7 Annex A (normative) Calibration of the test apparatus 8 B
16、S ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) iv I SO 5002 All irthgs ersedevr Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (
17、ISO member bodies). 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, go
18、vernmental and non-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/IE
19、C Directives, Part 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 memb
20、er 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 not be held responsible for identifying any or all such patent rights. ISO 20567-2 was prepared by Technical Committee ISO/TC 35, Paints and varni
21、shes, Subcommittee SC 9, General test methods for paints and varnishes. ISO 20567 consists of the following parts, under the general title Paints and varnishes Determination of stone-chip resistance of coatings: Part 1: Multi-impact testing Part 2: Single-impact test with a guided impact body BS ISO
22、 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) I SO 5002 All irthgs ersedevr v Introduction In the automobile industry, multi-layer paint coatings are applied to car bodies for protection. Grit, road-metal a
23、nd other materials can damage these coatings in such a way that individual layers come off or the whole coating delaminates from the substrate. Stone chipping can be simulated by means of single- and/or multi-impact tests. Part 1 of this International Standard describes multi-impact testing, Part 2
24、describes a single-impact test. This part of ISO 20567 is based on the German Standard DIN 55996-2:2001, Beschichtungsstoffe Prfung der Steinschlagfestigkeit von Beschichtungen Teil 2: Einzelschlagprfung (Paints and varnishes Stone chip resistance test for coatings Part 2: Single impact test). BS IS
25、O 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONAL TSANDADR IS-76502 O2:(5002E) I SO 5002 All irthgs ersedevr
26、 1 Paints and varnishes Determination of stone-chip resistance of coatings Part 2: Single-impact test with a guided impact body 1 Scope This part of ISO 20567 specifies a method for the evaluation of the resistance of automobile finishes and other coatings to the impact of a wedge-shaped body projec
27、ted onto the surface under test to simulate the impact of stones. 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 docum
28、ent (including any amendments) applies. ISO 1513, Paints and varnishes Examination and preparation of samples for testing ISO 1514, Paints and varnishes Standard panels for testing ISO 2808, Paints and varnishes Determination of film thickness ISO 3270, Paints and varnishes and their raw materials T
29、emperatures and humidities for conditioning and testing ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling IEC 60454-2, Specification for pressure-sensitive adhesive tapes for electrical purposes Part 2: Methods of test 3 Principle The stone-chip resistance of the coati
30、ng under test is checked by projecting a defined impact body onto it. The impact body used in the test has a wedge-shaped cutting edge to obtain a damage pattern equivalent to that produced in a multi-impact test. The wedge-shaped impact body is pushed onto the coating under test by the transmission
31、 of a pulse of energy from a steel ball accelerated using compressed air. Loose fragments of coating material are removed using adhesive tape. The stone-chip resistance is evaluated visually or by means of optical imaging. BS ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:
32、34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) 2 I SO 5002 All irthgs ersedevr 4 Apparatus and materials Ordinary laboratory apparatus, plus the following: 4.1 Single-impact tester Figure 1 shows the test apparatus. Figure 2 shows the shape of the impact body and its dimensions
33、. The impact body shall be made of hardened steel (hardness 60 HRC to 62 HRC). The impact body is inserted in the tester with the wedge-shaped end touching the coated test panel and the spring exerting a slight pressure on the body. A steel ball of mass inferior to that of the impact body is acceler
34、ated by a compressed-air blast (p = 300 kPa1) and transmits part of its energy to the impact body, which then strikes the test panel. The impact body shall be checked, and replaced if necessary, after a maximum of 500 test runs (i.e. after 500 impacts) or at the end of the series of tests during whi
35、ch the impact body passes the point at which it has been used for a total of 500 test runs. 4.2 Adhesive tape Unless otherwise agreed, adhesive tape with an adhesive strength between 6 N/25 mm width and 10 N/25 mm width (tested in accordance with IEC 60454-2) shall be used. The tape shall be at leas
36、t 25 mm wide. 5 Sampling Take a representative sample of the coating material to be tested, as described in ISO 15528. Examine and prepare each sample for testing, as described in ISO 1513. 6 Test panels 6.1 Substrate Unless otherwise agreed, use 200 mm 100 mm steel test panels that are between 0,7
37、mm and 1,0 mm thick. 6.2 Preparation and coating Unless otherwise agreed, prepare each test panel in accordance with ISO 1514 before coating and drying or stoving it. Use the application method specified by the paint manufacturer. 6.3 Thickness of the coating Determine the thickness, in micrometres,
38、 of the dry coating by one of the procedures specified in ISO 2808. 1) 100 kPa = 1bar. BS ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) I SO 5002 All irthgs ersedevr 3 Key 1 counterweight (mass exceeding
39、 1 kg) 5 housing 2 test panel 6 steel ball, hardness 60 HRC to 66 HRC 3 impact body 7 pipe, bore 0,015 0 8,6mm 4 steel spring, diameter of wire 0,8 mm, 2,5 windings 8 compressed air Figure 1 Test apparatus showing position of impact body BS ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na,
40、 Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) 4 I SO 5002 All irthgs ersedevr Dimensions in millimetres Figure 2 Impact body 7 Procedure 7.1 Calibration Instructions for the calibration of the tester are given in Annex A. 7.2 Conditioning of the test panels Cond
41、ition the test panels for at least 16 h at (23 2) C and (50 5) % relative humidity before carrying out the test, unless otherwise agreed (see ISO 3270). 7.3 Test conditions Carry out the test at (23 2) C and (50 5) % relative humidity (see ISO 3270). NOTE Exceptionally, other test conditions may be
42、agreed between the interested parties. 7.4 Number of test runs Unless otherwise agreed, each test shall comprise three test runs. BS ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-76502 O2:(5002E) I SO 5002 All irthgs ers
43、edevr 5 7.5 Determination Prior to starting the test, set the pressure of the compressed-air supply to 300 kPa. Place the test panel on the test apparatus with the coated side facing towards the impact body (see Figure 1), place a counterweight (of mass exceeding 1 kg) on it and turn on the compress
44、ed air to accelerate the steel ball and activate the impact body. When several impacts are to be delivered to one test panel, turn off the compressed air after each impact, move the panel by about 20 mm, replace the counterweight and then repeat the impact. After the final impact, place a strip of a
45、dhesive tape approximately 120 mm to 150 mm long over the damaged area of the test panel and press it firmly onto the surface. Bend one end of the tape upwards and pull the strip off with a jerk (at an angle of 90 to the test panel) to remove chips of paint that have not been completely separated fr
46、om the panel. In addition, remove loose paint fragments that were not pulled off with the tape using a knife or similar instrument. 8 Evaluation Evaluation of the damage can be done either visually or by means of digital optical imaging. Determine the extent of the damage by measuring the total widt
47、h, in millimetres, of the damage found in the coating, including the mark left by the wedge; by specifying, in addition, if possible, the main separation level or the layers of the paint system between which loss of adhesion occurred. An example of the result of a test run is shown in Figure 3. Exam
48、ples of defects caused are shown in Figure 4. Key 1 substrate 4 filler 2 phosphate coat 5 topcoat 3 cathodic electro-dip coat 6 width of defect Figure 3 Example of result of a test run BS ISO 205672:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:34:29 GMT+00:00 2006, Uncontrolled Cop
49、y, (c) BSI IS-76502 O2:(5002E) 6 I SO 5002 All irthgs ersedevr Dimensions in millimetres Figure 4 Examples of defects 9 Precision 9.1 Repeatability limit, r The repeatability limit r is the value below which the absolute difference between two test results can be expected to lie, with a 95 % probability, when this method is used under repeatability conditions, i.e. when the test results are obtain