CEN TS 16360-2012 Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of film extensibility by indentation of a coating on a wooden substrat.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationPaints and varnishes Coating materials and coating systems for exterior wood Assessment of filmextensibility by indentation of a coating on a wooden substratePD CEN/TS 16360:2012

2、National forewordThis Published Document is the UK implementation of CEN/TS 16360:2012.The UK participation in its preparation was entrusted to Technical CommitteeSTI/28, Paint systems for non-metallic substrates.A list of organizations represented on this committee can be obtained onrequest to its

3、secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 76734 0ICS 87.040Compliance with a British Standard cannot

4、confer immunity fromlegal obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationAmd. No. Date Text affectedPUBLISHED DOCUMENTPD CEN/TS 16360:2012TECHNICAL SPECIFICATION SPCIFICATION TEC

5、HNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 16360 July 2012 ICS 87.040 English Version Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of film extensibility by indentation of a coating on a wooden substrate Peintures et vernis - Produits de peintures et systmes

6、 de peintures pour bois en extrieur - valuation de lextensibilit du feuil par poinonnement dun revtement sur un support en bois Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme fr Holz im Auenbereich - Beurteilung der Verformbarkeit durch Eindrcken einer Beschichtung auf einem Holz

7、substrat This Technical Specification (CEN/TS) was approved by CEN on 9 April 2012 for provisional application. The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question wheth

8、er the CEN/TS can be converted into a European Standard. CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in forc

9、e (in parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland

10、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: A

11、venue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 16360:2012: EPD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and

12、definitions .54 Principle 55 Apparatus .56 Procedure .76.1 Wood panels .76.2 Coating application76.3 Assessment of film extensibility 77 Test report 7Bibliography 9PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 3 Foreword This document (CEN/TS 16360:2012) has been prepared by Technical Committee CEN/TC 1

13、39 “Paints and varnishes”, the secretariat of which is held by DIN. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the C

14、EN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv

15、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 4 Introduction A suitable extensibility of a coating film on wood in exterior use is of importanc

16、e to follow dimensional changes of the wood and to resist some mechanical impacts without formation of cracks in the coating film. The simple method described in this document gives evidence on extensibility of a coating film on wood on an ordinal scale and provides first evidence on mechanical beha

17、viour. A similar method exists in EN 13696:2008 for coated wood floorings in interior use but in the present document the description of a carefully selected substrate is added to enable testing of coating materials and coating systems for exterior wood. The method should preferably be used on coati

18、ngs that have not been exposed to weathering but it may also be applied after ageing of the coating film or under different climatic conditions to gain additional experience. PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 5 1 Scope This Technical Specification specifies a test method for assessing film e

19、xtensibility by indentation of a coating on a defined and carefully selected wooden extensibility substrate for coatings on stable wood components in exterior use. The method is preferably be used on coatings that have not been exposed to weathering. 2 Normative references The following documents, i

20、n whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 927-3:2012, Paints and varnish

21、es Coating materials and coating systems for exterior wood Part 3: Natural weathering test EN ISO 4618:2006, Paints and varnishes Terms and definitions (ISO 4618:2006) ISO 554, Standard atmospheres for conditioning and/or testing Specifications ISO 3131, Wood Determination of density for physical an

22、d mechanical tests 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 4618:2006 and the following apply. 3.1 film extensibility ability of a dry film to follow without damage the deformations of the substrate to which it is applied 4 Principle A meta

23、l plate with 12 cones with different heights is pressed into a coated wood surface and after removing the plate coating cracks in the areas indented by the cones are assessed. 5 Apparatus 5.1 Cone plate, metal plate with 12 cones with different heights (see Figure 1). The tips of cones are slightly

24、rounded, bases of all cones lie on the level of the metal plate, measures of cones are listed in Table 1. PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 6 Dimensions in millimetres Figure 1 Metal plate with 12 different cones for assessment of film extensibility Table 1 Heights and angles of cones Cone H

25、eight h in mm Angle aA 2,6 10645 B 2,4 11005 C 2,2 11540 D 2,0 12030 E 1,8 12540 F 1,6 13050 G 1,4 13625H 1,2 14210 I 1,0 14805K 0,8 15415 L 0,6 16035M 0,4 16700a aRounded to a multiple of 5. 5.2 Universal testing machine for compression tests with a maximum force of 100 kN, a constant speed of 8 mm

26、/min and an adapter to mount the cone plate with flexible connection. 5.3 Microscope with a magnification of min. 50 . PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 7 6 Procedure 6.1 Wood panels Boards of Norway spruce (Picea abies) are selected with normal growth rate (i.e. 3 annual rings to 8 annual r

27、ings per 10 mm), a density between 0,4 g/cm3and 0,5 g/cm3(measured after conditioning) and straight grain. The wood shall be free from blue stain and evidence of surface or bulk fungal infection. Abnormal porosity (caused by bacterial attack) shall be avoided according to EN 927-3:2012, B.9. From th

28、ese boards panels with the dimensions min. 170 mm min. 70 mm (20 2) mm free from knots, cracks and resinous streaks are produced, that the inclination of the growth rings to the test surface is 60 to 90. The panels shall be planed to a smooth and uniform finish. In order to avoid aged wood surface,

29、the panels shall be hand sanded (mesh 150) immediately before coating. The wood shall be conditioned at (20 2) C and a relative humidity of (65 5) % in accordance with ISO 554 to an equilibrium moisture content of (13 2) %. After conditioning, wood density is determined according to ISO 3131. 6.2 Co

30、ating application Apply the coating system to the front side of one panel using the method specified by the manufacturer to give a wet film thickness corresponding to the mean value ( 20 %) of the manufacturers recommended spreading rate. Record the quantity of coating applied. The values should be

31、stated preferably in g/m2, but may also be expressed as wet film thickness (in micrometres). After coating application, age the panels for 21 days in the controlled environment at (20 2) C and a relative humidity of (65 5) % in accordance with ISO 554. 6.3 Assessment of film extensibility The cone p

32、late is mounted into the universal testing machine in compression mode using an adapter for a flexible connection. After ageing the coating system for 21 days the cones are pressed into the coated wood surface with a constant speed of 8 mm/min so far that the metal plate is just in contact with the

33、panel surface. The metal plate is kept in contact with the panel surface for 10 s. Three tests shall be carried on the test panel. After removing the cone plate the areas indented by the cones are observed under a microscope with a magnification of min. 10 x to observe coating cracks in the region o

34、f the cones. The first cone of Table 1 where no concentric cracks in the coating film can be observed is taken as rating of film extensibility. In the event of no cracking occurring, the extensibility shall be rated as higher than A. Straight cracks in direction of the grain of the wood substrate sh

35、all be ignored. If the three tests give results spreading more than one cone number the test shall be repeated. 7 Test report The test report shall contain at least the following information: a) reference to this Technical Specification; b) name and address of the testing laboratory; c) type of appa

36、ratus used; d) identification number of the test report; e) name and address of the organisation or the person who ordered the test; f) date and person responsible for the sampling; PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 8 g) date of receipt of the coating system tested; h) test results according

37、 to 6.3 including wood density; i) authorisation date of the test report. PD CEN/TS 16360:2012CEN/TS 16360:2012 (E) 9 Bibliography EN 13696:2008, Wood flooring Test methods to determine elasticity and resistance to wear and impact resistance PD CEN/TS 16360:2012This page deliberately left blankThis

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