1、May 2007DEUTSCHE NORM English price group 8No 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!,xb7“www.din.deDDIN
2、EN ISO 2812-5Paints and varnishes Determination of resistance to liquids Part 5: Temperature-gradient oven method (ISO 2812-5:2007)English version of DIN EN ISO 2812-5:2007-05Beschichtungsstoffe Bestimmung der Bestndigkeit gegen Flssigkeiten Teil 5: Verfahren mit dem Gradientenofen (ISO 2812-5:2007)
3、Englische Fassung DIN EN ISO 2812-5:2007-05www.beuth.deDocument comprises 11 pages 985632008.07DIN EN ISO 2812-5:2007-05 2 National foreword This standard falls in the domain of Technical Committee CEN/TC 139 “Paints and varnishes” (Secretariat: DIN, Germany). It is identical with International Stan
4、dard ISO 2812-5 which was prepared by ISO/TC 35/SC 9 “General test methods for paints and varnishes” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Beschichtungsstoffe und Beschichtungen (Coatings and Coating Materials Standards Co
5、mmittee), Technical Committee NA 002-00-07 AA Allgemeine Prfverfahren fr Beschichtungsstoffe und Beschichtungen. DIN EN ISO 2812 consists of the following parts, under the general title “Paints and varnishes Determination of resistance to liquids”: Part 1: Immersion in liquids other than water Part
6、2: Water immersion method Part 3: Method using an absorbent medium Part 4: Spotting methods Part 5: Temperature-gradient oven method The DIN Standards corresponding to the International Standards referred to in the EN are as follows: ISO 1513 DIN EN ISO 1513 ISO 1514 DIN EN ISO 1514 ISO 2808 DIN EN
7、ISO 2808 ISO 3270 DIN EN 23270 ISO 3696 DIN ISO 3696 ISO 15528 DIN EN ISO 15528 National Annex NA (informative) Bibliography DIN EN 23270, Paints, varnishes and their raw materials Temperatures and humidities for conditioning and testing DIN EN ISO 1513, Paints and varnishes Examination and preparat
8、ion of samples for testing DIN EN ISO 1514, Paints and varnishes Standard panels for testing DIN EN ISO 2808, Paints and varnishes Determination of film thickness DIN EN ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling DIN ISO 3696, Water for analytical laboratory use
9、 Specification and test methods EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 2812-5January 2007ICS 87.040English VersionPaints and varnishes - Determination of resistance to liquids -Part 5: Temperature-gradient oven method (ISO 2812-5:2007)Peintures et vernis - Dtermination de la rsistance
10、 auxliquides - Partie 5: Mthode au four gradient detemprature (ISO 2812-5:2007)Beschichtungsstoffe - Bestimmung der Bestndigkeitgegen Flssigkeiten - Teil 5: Verfahren mit demGradientenofen (ISO 2812-5:2007)This European Standard was approved by CEN on 23 December 2006.CEN members are bound to comply
11、 with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management
12、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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theoffici
13、al versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Sloveni
14、a, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN nationa
15、l Members.Ref. No. EN ISO 2812-5:2007: EContents Page 1 Scope . 2 Normative references . 3 Principle. 4 Apparatus 5 Test substances 6 Sampling 7 Test panels 8 Procedure 9 Evaluation 10 11 Test report . Annex A (informative) Examples of test substances Bibliography . EN ISO 2812-5:2007 (E) 2 34 44For
16、eword.55 556 6Precision 77 89Foreword This document (EN ISO 2812-5:2007) 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 giv
17、en the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2007, and conflicting national standards shall be withdrawn at the latest by July 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of
18、 the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slov
19、akia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 2812-5:2007 has been approved by CEN as EN ISO 2812-5:2007 without any modifications. EN ISO 2812-5:2007 (E) 3 1 Scope This part of ISO 2812 specifies a method, using a temperature-gradient oven, for de
20、termining the resistance of an individual-layer or multi-layer system of coating materials to the effects of liquids or paste-like products. This method enables the testers to determine the effects of the test substance on the coating and, if necessary, to assess the damage to the substrate. 2 Norma
21、tive 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 1513, Paints and varnishes Ex
22、amination 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 Temperatures and humidities for conditioning and testing ISO 15528, Paints
23、, varnishes and raw materials for paints and varnishes Sampling 3 Principle A test substance (see Annex A) is applied to a coated test panel following a specified procedure. The test panel is placed in a gradient oven. The effects of the exposures are assessed in accordance with agreed criteria. EN
24、ISO 2812-5:2007 (E) 4 4 Apparatus Ordinary laboratory equipment and the following apparatus. 4.1 Gradient oven (see Figure 1). Key 1 test substance 2 test panel 3 special-purpose glass 4 heating elements Figure 1 Gradient-oven heating bench 4.2 Metering pipette, suitable for applying droplets of tes
25、t substance with a volume from 25 l to 100 l. 5 Test substances One or more test substances, as agreed between interested parties, shall be used. Examples of test substances are given in Annex A. 6 Sampling Take a representative sample of the coating material to be tested, in accordance with ISO 155
26、28. Pretest each sample in accordance with ISO 1513 and prepare it for further testing (see 7.2). 7 Test panels 7.1 Substrate Unless otherwise agreed, use steel test panels with dimensions of approximately 560 mm 100 mm and a thickness of 0,7 mm to 1,0 mm. 7.2 Preparation and coating Prepare each te
27、st panel as described in ISO 1514 and then coat it by the specified application method with the product or system under test. Dry (or stove) and age (if applicable) each coated test panel for the specified time under specified conditions. EN ISO 2812-5:2007 (E) 5 7.3 Coating thickness Determine the
28、dry film thickness of the coating, in micrometres, using one of the non-destructive methods specified in ISO 2808. 8 Procedure 8.1 Conditioning of the test panels Immediately before testing, condition the test panels for at least 16 h under standard conditions specified in ISO 3270, i.e. (23 2) C an
29、d (50 5) % relative humidity. 8.2 Test conditions The oven shall be placed in an environment at the standard temperature specified in ISO 3270, i.e. (23 2) C. 8.3 Determination Place the test panel horizontally. With the pipette, apply droplets of the liquid test substance (see examples in Annex A)
30、to the test panel, spacing them at a distance corresponding to that between the individual heating segments of the gradient oven, if not otherwise agreed. Application of the droplets should be carried out at room temperature (18 C to 28 C) with the panel placed on a laboratory table and not placed o
31、n the gradient oven. Unless otherwise agreed, set the gradient oven at a gradient from 35 C to 80 C. The temperature difference between the individual heating segments shall be 1 C. Push the prepared test panel into the gradient oven and press it to the heating bench using a pressing device. Expose
32、the test panel in the gradient oven for 30 min then take it out of the oven. 9 Evaluation After the test period has expired, wipe the test panel with a smooth cloth. Clean off any dried residue of aqueous test substances under running water, and clean off the dried residue of any other test substanc
33、es with a solvent that does not attack the coating. NOTE Dry-cleaning gasoline can be used for eliminating the resin. Dry-cleaning gasoline can also be used for the last cleaning of the panels before evaluation. Evaluate only the area which has been in direct contact with the test substance. Then im
34、mediately assess the test panel. If not otherwise agreed, use the following illumination for the assessment: aluminium-coated reflector without raster, light colour at least 840, illuminance on the on the test panel at least 800 lx. The defects are best visible if the reflection of the light source
35、is viewed together with the defect. Unless otherwise agreed, reassess the exposed areas after 24 h. Report the result as the temperature showing the first visible change. EN ISO 2812-5:2007 (E) 6 10 Precision 10.1 Repeatability limit (r) The repeatability limit (r) is the value below which the absol
36、ute difference between two single test results, each the mean of duplicates, can be expected to lie when this method is used under repeatability conditions. In this case, the test results are obtained on identical material, by one operator in one laboratory within a short interval of time using the
37、standardized test method. In this part of ISO 2812, (r) is 4 C ( 2 C), with a 95 % probability. 10.2 Reproducibility limit (R) The reproducibility limit (R) is the value below which the absolute difference between two test results, each the mean of duplicates, can be expected to lie when this test m
38、ethod is used under reproducibility conditions. In this case, the test results are obtained on identical material, by operators in different laboratories using the standardized test method. In this part of ISO 2812, (R) is 8 C ( 4 C), with a 95 % probability. 11 Test report The test report shall con
39、tain at least the following information: a) all information necessary for identification of the sample tested, including the manufacturer, trade name, batch number, etc.; b) a reference to this International Standard (ISO 2812-5:2006); c) details of the test panels, including: 1) the material (inclu
40、ding thickness) and surface pretreatment of the substrate; 2) application method for applying the sample coating to the substrate, including the drying time and drying conditions for all layers; where applicable, ageing conditions before the test; 3) dry film thickness of the coating in micrometres,
41、 including the measuring method as chosen in ISO 2808; d) details of the method used, including the specification of the test substances; e) the temperature gradient in the oven; f) the results of the test as specified in Clause 9; g) the name of the person who conducted the test; h) any deviations
42、from the procedure specified; i) any unusual features (anomalies) observed during the test; j) the date of the test. EN ISO 2812-5:2007 (E) 7 Annex A (informative) Examples of test substances Examples of laboratory chemicals and biological substances that can be used as test substances are given in
43、Tables A.1 and A.2. Other test liquids may be used, by agreement between the interested parties. The identification and/or composition of the products should be specified as given in Tables A.1 and A.2, unless otherwise agreed. Use only analytical-grade chemicals. Table A.1 Laboratory chemicals Test
44、 substance Differing volumes of droplets (see 8.3) Sodium hydroxide solution, with a mass fraction of 5 % sodium hydroxide 100 l Hydrochloric acid solution, with a mass fraction of 10 % hydrochloric acid 100 l Sulfurous acid solution, with a mass fraction of 6 % sulfurous acid 25 l Sulfuric acid sol
45、ution, with a mass fraction of 10 % sulfuric acid 25 l Sulfuric acid solution, with a mass fraction of 36 % suluric acid 25 l Water, conforming to the requirements of Grade 3 of ISO 3696 100 l Table A.2 Biological substances Test substance Comments Differing volumes of droplets (see 8.3) Resin Rosin
46、 50 % (by mass) pine oil 50 % (by mass) 25 l Fall-out test substance e.g. formic acid 47 % (by mass) tannic acid 24 % (by mass) albumin 5 % (by mass) honey 24 % (by mass) 25 l Gum arabic e.g. Acacia gum 25 l Rosin 25 Simulated bird droppings Pancreatin,a1:1 diluted with water conforming to the requi
47、rements of Grade 3 of ISO 3696 50 l aPancreatin may be ground in a mortar, if agreed between the interested parties. If the pancreatin is ground, this shall be stated in the test report. EN ISO 2812-5:2007 (E) 8 Bibliography 1 ISO 3696, Water for analytical laboratory use Specification and test methods EN ISO 2812-5:2007 (E) 9
