1、BRITISH STANDARDBS EN ISO 11998:2006Paints and varnishes Determination of wet-scrub resistance and cleanability of coatingsThe European Standard EN ISO 11998:2006 has the status of a British StandardICS 87.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g5
2、0g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 11998:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 55354 7National forewordThi
3、s British Standard is the UK implementation of EN ISO 11998:2006. It supersedes BS EN ISO 11998:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained
4、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.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Com
5、mentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11998July 2006ICS 87.040 Supersedes EN ISO 11998:2001 English VersionPaints and varnishes - Determination of wet-scrub resistanceand cleanability of coatings (ISO 11998:2006)Peintures et vernis - Dtermination de la rsistance aufrottement hum
6、ide et de laptitude au nettoyage desrevtements (ISO 11998:2006)Beschichtungsstoffe - Bestimmung derNassabriebbestndigkeit und der Reinigungsfhigkeit vonBeschichtungen (ISO 11998:2006)This European Standard was approved by CEN on 7 July 2006.CEN members are bound to comply with the CEN/CENELEC Intern
7、al 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 Central Secretariat or to any CEN member.Th
8、is 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 Central Secretariat has the same status as the officialversions.CEN members are the
9、national standards bodies of Austria, Belgium, 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 K
10、ingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11998:2006: EFor
11、eword This document (EN ISO 11998:2006) 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 stand
12、ard, either by publication of an identical text or by endorsement, at the latest by January 2007, and conflicting national standards shall be withdrawn at the latest by January 2007. This document supersedes EN ISO 11998:2001. According to the CEN/CENELEC Internal Regulations, the national standards
13、 organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romani
14、a, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 11998:2006 has been approved by CEN as EN ISO 11998:2006 without any modifications. EN ISO 11998:2006Reference numberISO 11998:2006(E)INTERNATIONAL STANDARD ISO11998Second edition2006-07-15Paints
15、 and varnishes Determination of wet-scrub resistance and cleanability of coatings Peintures et vernis Dtermination de la rsistance au frottement humide et de laptitude au nettoyage des revtements EN ISO 11998:2006ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3
16、 Terms and definitions. 1 4 Principle. 2 5 Reagents 2 6 Apparatus 2 7 Sampling 4 8 Procedure 4 9 Expression of results . 6 10 Precision 7 11 Test report . 8 Annex A (normative) Determination of the dry-film density of the coating . 9 Bibliography . 11 EN ISO 11998:2006iv Foreword ISO (the Internatio
17、nal 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 subject for which a technical committee has been
18、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 Commission (IEC) on all matters of electrotechnical standar
19、dization. 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 committees are circulated to the member bodies for v
20、oting. 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 not be held responsible for identifying any or all s
21、uch patent rights. ISO 11998 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 11998:1998), which has been technically revised. The main changes are: t
22、he definitions for stroke length and scrub cycle have been changed and a new term scrub length has been introduced; the method for the determination of the dry-film density of the coating, specified in Annex A, has been replaced by a new method. EN ISO 11998:2006vIntroduction As noted in the Forewor
23、d, this International Standard is a revision of ISO 11998:1998. The use and application of the standard is now established globally, and improved procedures/equipment have been proposed. A joint CEN/ISO working group has agreed to undertake interlaboratory testing with a new type of abrasive pad (di
24、fferent from that specified in 6.5). It is anticipated that the results of the testing will be available by the end of 2006 and an early revision of the standard might be initiated. EN ISO 11998:2006blank1Paints and varnishes Determination of wet-scrub resistance and cleanability of coatings 1 Scope
25、 The ability of coatings to withstand wear caused by repeated cleaning operations and to withstand penetration by soiling agents is an important consideration both from a practical point of view and when comparing and rating such coatings. This International Standard describes an accelerated method
26、for the determination of wet-scrub resistance. With regard to the cleanability of coatings, only the method itself and not the soiling agents are specified. NOTE Since these properties depend not only on the quality of a coating but also on the substrate, the method of application, the drying condit
27、ions and other factors, the results obtained are not directly transferable to actual practice. In this standard the evaluation of the coating is based on a defined substrate, a fixed application method, specified drying conditions and a defined method of wet scrubbing. 2 Normative references The fol
28、lowing 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 Examination and preparati
29、on of samples for testing ISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing ISO 3696, Water for analytical laboratory use Specification and test methods ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3 Te
30、rms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 cleanability ability of a dry coating film to withstand penetration by soiling agents and to be freed from them through the cleaning process without removing more than a defined film thickness 3.2 s
31、crub cycle one reciprocal movement of the scrub pad over the scrub length in both directions 3.3 scrub length stroke length plus the length of the pad EN ISO 11998:20062 3.4 stroke length distance traversed by one stroke of the apparatus 3.5 wet-scrub resistance ability of a dry coating film to sust
32、ain less than a specified loss in film thickness, averaged over a defined area, when exposed to 200 wet-scrub cycles 4 Principle 4.1 Wet-scrub resistance The test coating is applied to a test panel using a film applicator at the appropriate gap clearance. After drying and conditioning, the coated pa
33、nel is weighed and subjected to 200 wet-scrub cycles in a scrub testing machine. NOTE Some classification standards, e.g. EN 13300, require fewer scrub cycles. It is then washed, dried and weighed again to determine its loss in mass, from which the mean loss in film thickness is calculated. Through
34、comparison of the mean loss in film thickness with a specified value, as agreed between interested parties, the coating can be rated in wet-scrub resistance classes. 4.2 Cleanability For the determination of cleanability, soiling agents are applied to similarly prepared coated panels. The soiling ag
35、ents specified are left in contact with the coating film for a specified time. The coated, soiled panels are then subjected to 200 wet-scrub cycles. When the applied soiling agent is observed to be removed and the coating is wet-scrub resistant, the coating is said to be cleanable in terms of the so
36、iling agent used. 5 Reagents 5.1 Washing liquid Use a 2,5 g/l solution of sodium n-dodecylbenzenesulfonate in water conforming to the requirements of grade 3 of ISO 3696. Allow the solution to stand before use until all air-bubbles and foam have dissipated. 5.2 Soiling agents The soiling agents and
37、manner of application shall be agreed between the interested parties. 6 Apparatus 6.1 Test panel, made of PVC film free of migration-susceptible chemical plasticizers, of sufficient rigidity to ensure a flat surface, impervious to and unaffected by water or aliphatic organic solvents and of nominal
38、thickness 0,25 mm, approximately 430 mm long and not less than 80 mm wide. Other types of plastics film may be used where the coating contains solvent which might adversely affect the PVC film. If the coating delaminates before or during the test, another, more suitable, substrate shall be used. EN
39、ISO 11998:200636.2 Film applicator, preferably an automatic film applicator, used at an application speed of 10 mm/s to 15 mm/s and fitted with a doctor blade with an appropriate gap clearance and a gap width of at least 60 mm. 6.3 Wet-scrub tester apparatus, consisting of a reciprocating scrub test
40、ing machine with a stroke length of (300 10) mm and operating at approximately (37 2) scrub cycles per minute. A counter for recording the number of scrub cycles shall be provided. 6.4 Scrub pad holder, consisting of a metal plate fitted with pins to hold the abrasive pad. A mounting device with elo
41、ngated holes is loosely fitted on the top of the plate (see Figure 1 and Figure 2). The mass of the scrub pad holder which exerts a downward force on the test panel shall be (135 1) g. Figure 1 Mounting device Dimensions in millimetres Key 1 pins Figure 2 Scrub pad holder EN ISO 11998:20064 6.5 Abra
42、sive pad 1), of non-woven plastics material, with embedded abrasive, measuring (90,0 0,5) mm (39,0 0,5) mm. A new abrasive pad shall be used for every test. 6.6 Analytical balance, shielded from draughts, capable of weighing the test panel with applied coating to the nearest 1 mg. 6.7 Straight-edge
43、ruler, with 0,5 mm divisions. 7 Sampling Take a representative sample of the coating to be tested, as described in ISO 15528. Examine and prepare the sample as described in ISO 1513. 8 Procedure 8.1 Film application Using the film applicator, make a draw-down of the prepared sample of coating materi
44、al on the test panel to achieve an even film at least 10 mm longer than the scrub length (see 3.3). Ensure the gap clearance is sufficient that the resulting dry film is of such a thickness that, after 200 wet-scrub cycles, the substrate is not exposed. For the determination of wet-scrub resistance,
45、 dry the film in the standard atmosphere defined in ISO 3270 for the specified period. Weigh the test panel with the dried coating film to the nearest 1 mg. Either prepare panels for the determination of cleanability at the same time as for the determination of wet-scrub resistance, or use one half
46、of a panel for cleanability and the other half for wet-scrub resistance (see the Note). Dry the film in the standard atmosphere defined in ISO 3270 for the specified period. Apply the specified soiling agents (see 5.2) in the manner agreed 24 h before completion of the drying period. NOTE Duplicate
47、panels are best prepared by using a standard panel measuring (165 430) mm and making a draw-down approximately 150 mm wide. After drying, the panel may then be cut in half lengthwise. The mass of the soiling agents normally applied (marks made using e.g. a lead pencil, red-wax crayon or charcoal pen
48、cil) is not significant. If soiling agents having a significant mass are applied, separate panels shall be used for the determination of cleanability and wet-scrub resistance. 8.2 Wet-scrub resistance Ensure that the pad-displacing system is parallel to the surface of the test panel and that the mou
49、nting device is not in contact with the scrub pad holder (see Figure 3). Place the test panel with the applied coating film in the base pan of the scrub testing machine on a float glass support and hold it down with clamps (see Figure 4), but not so tight as to cause warping of the test panel. Spread the washing liquid with a soft paint brush on the surface of the coating. Leave the liquid in contact with the coating for 60 s. 1) 3M Scotch Britehandpads, No. 7448, Type S, Grade UFN, grey, which can be cut to size, are an example of a
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