1、January 2010DEUTSCHE NORM English price group 11No 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!$r“1567929www.d
2、in.deDDIN EN ISO 28199-3Paints and varnishes Evaluation of properties of coating systems related to the applicationprocess Part 3: Visual assessment of sagging, formation of bubbles, pinholingand hiding power (ISO 28199-3:2009)English version of DIN EN ISO 28199-3:2010-01Beschichtungsstoffe Beurteil
3、ung applikationsbedingter Eigenschaften von Beschichtungssystemen Teil 3: Visuelle Beurteilung von Ablaufneigung, Kocherbildung, Nadelstichbildung undDeckvermgen (ISO 28199-3:2009)Englische Fassung DIN EN ISO 28199-3:2010-01www.beuth.deDocument comprises 15 pagesDIN EN ISO 28199-3:2010-01 2 National
4、 foreword This standard has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes”, Subcommittee SC 9 “General test methods for paints and varnishes” (Secretariat: BSI, United Kingdom) in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” (Secretariat: DIN, Germa
5、ny). The responsible German body involved in its preparation was the Normenausschuss Beschichtungsstoffe und Beschichtungen (Coatings and Coating Materials Standards Committee), Working Committee NA 002-00-07 AA Allgemeine Prfverfahren fr Beschichtungsstoffe und Beschichtungen. The test method speci
6、fied in ISO 28199 is based on studies by a Working Group of the European Council for Automotive R surface texture; colour in accordance with ISO 7724 (all parts). In combination with visual assessment, the following properties are determined: colour stability, process hiding power, re-dissolving, ov
7、erspray absorption, wetting, surface texture and mottling (ISO 28199-2); tendency toward sagging, formation of bubbles, pinholing and hiding power (this part of ISO 28199). 4 EN ISO 28199-3:2009 (E) DIN EN ISO 28199-3:2010-01 IMPORTANT The electronic file of this document contains colours which are
8、considered to be useful for the correct understanding of the document. Users should therefore consider printing this document using a colour printer. 1 Scope This part of ISO 28199 specifies visual methods for the assessment of tendency toward sagging, formation of bubbles, pinholing and hiding powe
9、r of coating materials applied to a test panel under defined conditions. 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 reference
10、d document (including any amendments) applies. ISO 6504-3, Paints and varnishes Determination of hiding power Part 3: Determination of contrast ratio of light-coloured paints at a fixed spreading rate ISO 28199-1:2009, Paints and varnishes Evaluation of properties of coating systems related to the a
11、pplication process Part 1: Relevant vocabulary and preparation of test panels 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 28199-1 apply. 4 Tendency toward sagging 4.1 General The tendency toward sagging is determined by visual assessment of the s
12、ag. This assessment is made after drying/curing of the coating, on a panel prepared in accordance with Version A in ISO 28199-1:2009. If a tendency toward sagging is already visible in the liquid layer, this should be marked at the edge of the panel. Film thickness is determined using the values mea
13、sured in accordance with 9.4.2 of ISO 28199-1:2009. 5 DIN EN ISO 28199-3:2010-01 EN ISO 28199-3:2009 (E) Dimensions in millimetres Key 1 measuring series 1 2 coil-coated reference strip 3 clear-coated reference strip a distance from start of coating to 10-mm sag Figure 1 Assessment of sagging 6 EN I
14、SO 28199-3:2009 (E) DIN EN ISO 28199-3:2010-01 4.2 Evaluation After drying/curing of the coating, visually assess the perforated area of the test panel (see ISO 28199-1:2009, Figure 2) for the determination of the tendency to sagging. Determine the hole at which the sag exceeds a length of 10 mm fro
15、m the lower edge of the hole (see Figure 1), and determine the film thickness corresponding to that hole in accordance with 9.4.2 of ISO 28199-1:2009. The greater the distance a for a given film thickness, the less the tendency of the coating to sag. A control chart of film thickness vs distance a c
16、an assist in this evaluation. Other lengths of sag for measuring film thickness may be agreed by interested parties. 5 Bubbles 5.1 General Assessment of the bubble formation limit is made visually after drying/curing of the coating. Examples of bubbles in a coating material are shown in Figures A.1
17、and A.2. The film thickness values are determined in accordance with 9.4.2 of ISO 28199-1:2009. 5.2 Evaluation After drying/curing of the coating, assess the bubble formation limit (see 3.2 of ISO 28199-1:2009) visually in the range of the film thickness pattern in the wedge area (see ISO 28199-1:20
18、09, Figure 5 and Figure 6). Determine the film thickness which corresponds to this bubble formation limit by using the film thickness measurement pattern. 6 Pinholing 6.1 General Assessment of the pinholing limit is made visually after drying/curing of the coating. Examples of pinholes in a coating
19、material are shown in Figures A.3 to A.6. The film thickness values are determined in accordance with 9.4.2 of ISO 28199-1:2009. 6.2 Evaluation After drying/curing of the coating, assess the pinholing limit (see 3.11 of ISO 28199-1:2009) visually in the range of the film thickness pattern in the wed
20、ge area (see ISO 28199-1:2009, Figure 5 and Figure 6). Using the film thickness measurement pattern, determine the film thickness corresponding to this pinholing limit. 7 Process hiding power 7.1 General Assessment of the process hiding power (see ISO 28199-1:2009, 3.12) is made visually after dryin
21、g/curing of the coating. The film thickness values are determined in accordance with 9.4.2 of ISO 28199-1:2009. 7 DIN EN ISO 28199-3:2010-01 EN ISO 28199-3:2009 (E) 7.2 Evaluation After drying/curing of the coating, assess the process hiding power visually in accordance with ISO 6504-3 in the range
22、of the wedge-shaped layer applied to the contrast strip. Determine the film thickness which corresponds to the process hiding power using the film thickness measurement pattern (see ISO 28199-1:2009, Figure 5 and Figure 6). 8 Test report Prepare a test report in accordance with Clause 12 of ISO 2819
23、9-1:2009. 8 EN ISO 28199-3:2009 (E) DIN EN ISO 28199-3:2010-01 Annex A (informative) Examples of bubbles, pinholes and craters Examples of bubbles, pinholes and craters are shown in Figures A.1 to A.9. NOTE The photographs of craters have been included in view of the fact that pinholes (see ISO 2819
24、9-1:2009, 3.10) are often confused with craters (see ISO 28199-1:2009, 3.4). Figure A.1 Bubbles Top view 9 DIN EN ISO 28199-3:2010-01 EN ISO 28199-3:2009 (E) Figure A.2 Bubble Cross-section Figure A.3 Pinhole Top view 10 EN ISO 28199-3:2009 (E) DIN EN ISO 28199-3:2010-01 Figure A.4 Pinhole 1 Cross-s
25、ection Figure A.5 Pinhole 2 Cross-section 11 DIN EN ISO 28199-3:2010-01 EN ISO 28199-3:2009 (E) Figure A.6 Pinhole 3 Cross-section Figure A.7 Crater Top view 12 EN ISO 28199-3:2009 (E) DIN EN ISO 28199-3:2010-01 Figure A.8 Crater 1 Cross-section Figure A.9 Crater 2 Cross-section 13 DIN EN ISO 28199-3:2010-01 EN ISO 28199-3:2009 (E)
