1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Part 5: Temperature-gradient oven methodThe European Standard EN ISO 2812-5:2007 has the status of
2、a British StandardICS 87.040Paints and varnishes Determination of resistance to liquids BRITISH STANDARDBS EN ISO 2812-5:2007BS EN ISO 2812-5:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2007 BSI 2007ISBN 978 0 580 50473 0Amen
3、dments issued since publicationAmd. No. Date Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 2812-5:
4、2007.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on STI/10 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a EUROPEAN STANDARD
5、NORME 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 auxliquides - Partie 5: Mthode au four gradient
6、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 with the CEN/CENELEC Internal Regulations which
7、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 Centre or to any CEN member.This European Standar
8、d 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 theofficial versions.CEN members are the national standard
9、s 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, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
10、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 national Members.Ref. No. EN ISO 2812-5:2007: EForeword
11、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 given the status of a national standard,
12、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 the following countries are bound to
13、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, Slovakia, Slovenia, Spain, Sweden, Switzer
14、land 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 2812-5:2007Reference numberISO 2812-5:2007(E)INTERNATIONAL STANDARD ISO2812-5First edition2007-01-15Paints and varnishes Determination of resistanc
15、e to liquids Part 5: Temperature-gradient oven method Peintures et vernis Dtermination de la rsistance aux liquides Partie 5: Mthode au four gradient de temprature EN ISO 2812-5:2007ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Apparatus 2 5 Test substances
16、2 6 Sampling 2 7 Test panels 2 8 Procedure 3 9 Evaluation 3 10 Precision 4 11 Test report . 4 Annex A (informative) Examples of test substances 5 Bibliography . 6 EN ISO 2812-5:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
17、dies (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 organizatio
18、ns, governmental 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
19、ISO/IEC 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 th
20、e 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 not be held responsible for identifying any or all such patent rights. ISO 2812-5 was prepared by Technical Committee ISO/TC 35, Paints and
21、varnishes, Subcommittee SC 9, General test methods for paints and varnishes. 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 2: Water immersion method Part 3: Method usin
22、g an absorbent medium Part 4: Spotting methods Part 5: Temperature-gradient oven method EN ISO 2812-5:20071Paints and varnishes Determination of resistance to liquids Part 5: Temperature-gradient oven method 1 Scope This part of ISO 2812 specifies a method, using a temperature-gradient oven, for det
23、ermining 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 Normat
24、ive 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 Exa
25、mination 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,
26、 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 I
27、SO 2812-5:20072 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 test subs
28、tance 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 15528. Pr
29、etest 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 test pan
30、el 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 2812-5:200737.3 Coating thickness Determine the dry film thi
31、ckness 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 and (50 5) % r
32、elative 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) to the test
33、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 on the gradie
34、nt 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 the test pan
35、el 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 substances with a so
36、lvent 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 immediately as
37、sess 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 is viewed to
38、gether 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 2812-5:20074 10 Precision 10.1 Repeatability limit (r) The repeatability limit (r) is the value below which the absolute difference be
39、tween 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 standardized test
40、 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 method is used und
41、er 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 contain at least the
42、 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 (including thickness) a
43、nd 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, including the me
44、asuring 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 from the procedur
45、e specified; i) any unusual features (anomalies) observed during the test; j) the date of the test. EN ISO 2812-5:20075Annex A (informative) Examples of test substances Examples of laboratory chemicals and biological substances that can be used as test substances are given in Tables A.1 and A.2. Oth
46、er 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 substance Differing vo
47、lumes 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 solution, with a mass frac
48、tion 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 50 % (by mass) pine oi
49、l 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 requirements 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 repor
