1、PD CEN/TS 16969:2016Paints and varnishes Coating materials and coatingsystems for exterior wood Assessment of end grainsealing performanceBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06PD CEN/TS 16969:2016 PUBLISHED DOCUMENTNational forewordThis Published Document i
2、s the UK implementation of CEN/TS16969:2016.The UK participation in its preparation was entrusted to TechnicalCommittee STI/28, Paint systems for non-metallic substrates.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport
3、 to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 92697 6ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments issued since publicationDate Text affectedPD CEN/TS 16969:2016TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 16969 July 2016 ICS 87.040 Engl
5、ish Version Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of end grain sealing performance Peintures et vernis - Produits de peinture et systmes de peinture pour bois en extrieur - valuation des performances du colmatage des bois de bout Beschichtungssto
6、ffe - Beschichtungsstoffe und Beschichtungssysteme fr Holz im Auenbereich - Beurteilung des Leistungsverhaltens von Hirnholzversielgelungen This Technical Specification (CEN/TS) was approved by CEN on 12 June 2016 for provisional application. The period of validity of this CEN/TS is limited initiall
7、y to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether 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 C
8、EN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (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 o
9、f Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
10、 Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide fo
11、r CEN national Members. Ref. No. CEN/TS 16969:2016 EPD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Principle . 4 5 Sample preparation 5 5.1 Wood 5 5.2 Preparation of coated and uncoated samples 6 5.2.1
12、Wood conditioning . 6 5.2.2 Sample selection 6 5.2.3 Coating application . 6 5.2.4 Sealing and conditioning 6 6 Apparatus . 7 7 Procedure. 7 7.1 Pre-Conditioning . 7 7.2 Absorption cycle 7 7.3 Optional testing of weathered samples . 8 8 Calculation and expression of results 8 9 Test report . 8 Bibli
13、ography 9 PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 3 European foreword This document (CEN/TS 16969:2016) has been prepared by Technical Committee CEN/TC 139 “Paints and varnishes”, the secretariat of which is held by DIN. Attention is drawn to the possibility that some of the elements of this docum
14、ent may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to announce this Technical Specification: Austria, Be
15、lgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swit
16、zerland, Turkey and the United Kingdom. PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 4 1 Scope This Technical Specification specifies a test method to evaluate the ability of coating materials to seal the end grain of wood against ingress of water. This procedure is relevant for joinery or wood based c
17、ladding materials whose service life can depend on the control of water penetration through the coated end-grain. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the
18、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 927-5:2006, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 5: Assessment of the liquid water permeability EN ISO 4618, Paints an
19、d varnishes - Terms and definitions (ISO 4618) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 4618 and the following apply. 3.1 water absorption ability of a coated or uncoated wood sample to absorb water from liquid or vapour SOURCE: EN 927-5:20
20、06, 3.1 3.2 water permeability ability of a coating system to allow the transmission of water as liquid or vapour SOURCE: EN 927-1:2013, 3.13 3.3 stable mass mass achieved when the difference between two subsequent weighings within 24 h does not exceed 0,2 % SOURCE: EN 927-5:2006, 3.3 3.4 end grain
21、sealer system applied on the end grain 4 Principle Water permeability is assessed by measuring the water uptake over a 72 h period of coated test pieces exposed to liquid water. The coating under test is applied to the end grain surface of a defined test piece where the remaining sides are carefully
22、 sealed using a sealer of a defined mandatory low water PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 5 permeability. Results are expressed as water absorption of coated wood samples in grams per square meter test surface per 72 h. 5 Sample preparation 5.1 Wood The wood shall be spruce (Picea abies) tha
23、t has been selected to be free from knots and cracks, to be straight-grained and of normal growth rate (i.e. between 3 and 8 annual rings per 10 mm). The wood shall be free from blue stain and evidence of surface or bulk infection. Abnormal porosity (caused by bacterial attack) shall be avoided. Abn
24、ormally porous wood can be detected qualitatively by the rapid absorption of a drop of propan-2-ol (isopropanol) applied to the surface; the drop should not be absorbed in less than 30 s by normal wood. The test should be carried out at not less than six places, widely separated on the rear face of
25、the test sample. The density of the wood shall be between 0,4 g/cm3and 0,5 g/cm3when measured at an equilibrium moisture content of approximately 12 %. The measured density shall be recorded. Condition the wood prior to conversion into test samples at (20 2) C and a relative humidity of (65 5) %. Co
26、nvert the conditioned wood into samples (45 2) mm (45 2) mm (150 2) mm in size. The samples shall be planed all round to a smooth and uniform finish. The end grain shall be cut with a sharp circular saw to obtain a smooth surface without visible defects from cutting. Any samples showing surface spli
27、tting shall be rejected. The longitudinal edges shall be rounded with 3 mm radius. For illustration, see Figure 1. Key a = (150 2) mm b = (45 2) mm c = (45 2) mm Figure 1 Size of test samples PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 6 5.2 Preparation of coated samples and sealed controls 5.2.1 Wood
28、 conditioning Prior to coating, condition the samples to constant mass at (20 2) C and a relative humidity of (65 5) %. Samples shall be weighed at intervals of not less than one day until they have reached a stable mass (see 3.3). 5.2.2 Sample selection Select five samples for each of the coatings
29、to be tested. Select also five samples for testing the sealer product; this set of samples will serve as sealed controls. 5.2.3 Coating application Coating systems shall be applied according to the manufacturers specifications. Apply each test coating system to one end grain surface only. Record app
30、lied quantity of each coating layer by weighing the samples before and after coating application. 5.2.4 Sealing and conditioning Samples shall be sealed in the same way whether they are applied for test coatings or control of sealer. Seal all sides and the uncoated end-grain of the samples against w
31、ater entry using at least two coats of a flexible moisture-impermeable coating, for example a solvent-free epoxy or polyurethane paint. The liquid water permeability of the sealer tested according to EN 927-5 shall not exceed 30 g/m2in 72 h. The sealer shall cover the edges completely and overlap th
32、e test face by 2 mm (see Figure 2). Apply the sealer to the uncoated end grain so many times that a closed and uniform film is obtained. Key 1 coating application on one end grain 2 sealing of all sides and the opposite end grain d overlap of sealer on test face, d = 2 mm Figure 2 Coating and sealin
33、g of the test samples PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 7 6 Apparatus 6.1 Conditioning room, of appropriate size, controlled at a temperature of (20 2) C and a relative humidity of (65 5) %. 6.2 Container, for deionized water, of size sufficient to hold the all the samples under test. 6.3 Ba
34、lance, capable of weighing to the nearest 0,01 g. 7 Procedure 7.1 Pre-Conditioning After coating application, sealing and drying of coating materials the samples shall be stored in controlled environment (see 6.1) at (20 2) C and a relative humidity of (65 5) %, until a stable mass is achieved. NOTE
35、 Usually 28 days is used as a suitable time period for drying and curing. 7.2 Absorption cycle Weigh the test samples to the nearest 0,01 g and record the initial mass (m0). Fill the container (6.2) with deionized water and place it in the conditioning room (6.1). The water shall have reached stable
36、 temperature in the conditioned room, i.e. (20 2) C. Immerse the test samples with the coated end grain surface under test down into the water ensuring that the whole of the test face is fully wetted. Use a sample holder and load the samples with weight to ensure that the test surfaces are (10 3) mm
37、 under the water surface. After 72 h remove the test samples from the water, blot lightly to remove any water droplets and weigh. Record the elapsed time and mass (m1). All handling of the samples shall be carried out in the conditioning room (6.1). An example for the test set up see Figure 3. Key 1
38、 Samples with end grain sealer under test facing downwards 2 water 3 grid to ensure full wetting of test face Figure 3 Example for test set up PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 8 7.3 Optional testing of weathered samples If required, end grain sealers may be subjected to a weathering test be
39、fore or after measurement of liquid water permeability. 8 Calculation and expression of results At the end of the test, calculate the water uptake m1 m0, in grams for the five coated samples with the end grain sealer under test and the five sealed control samples. Calculate the water absorption per
40、square metre of test surface for the five coated samples with the end grain sealer under test and the five sealed control samples by dividing the water uptake by the nominal test area of each of the five test samples. From the five values for the water absorption mean value and standard deviation sh
41、all be stated in the test report. 9 Test report The test report shall contain at least the following information: a) all details necessary to identify the product tested; b) a reference to this Technical Specification; c) the name and address of the testing laboratory; d) the identification number o
42、f the test report; e) the name and address of the organization or the person who ordered the test; f) the mean water absorption value and standard deviation for the coated and the sealed control samples, as indicated in Clause 8; g) the density of the wood used for the test samples; h) the applied a
43、mount of coating materials under test; i) any deviation from the test method specified; j) the authorization date of the test report. PD CEN/TS 16969:2016CEN/TS 16969:2016 (E) 9 Bibliography EN 927-1:2013, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 1: Class
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