1、BSI Standards PublicationBS EN 73:2014Wood preservatives Accelerated ageing of treatedwood prior to biologicaltesting Evaporative ageingprocedureBS EN 73:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 73:2014. Itsupersedes BS 5761-1:1989 which is withdrawn
2、.The UK participation in its preparation was entrusted to TechnicalCommittee B/515, Wood preservation.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are res
3、ponsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 77207 8ICS 71.100.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandard
4、s Policy and Strategy Committee on 31 October 2014.Amendments issued since publicationDate Text affectedBS EN 73:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 73 October 2014 ICS 71.100.50 Supersedes EN 73:1988English Version Wood preservatives - Accelerated ageing of treated wood prior t
5、o biological testing - Evaporative ageing procedure Produits de prservation du bois - preuves de vieillissement acclr des bois traits avant essais biologiques - preuve dvaporation Holzschutzmittel - Beschleunigte Alterung von behandeltem Holz vor biologischen Prfungen - Verdunstungsbeanspruchung Thi
6、s European Standard was approved by CEN on 30 August 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical referen
7、ces concerning such national standards may be obtained on application to the CEN-CENELEC Management 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 translation under the responsibility of a CEN m
8、ember into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
9、France, Germany, Greece, Hungary, Iceland, 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 EUROPISCHE
10、S KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 73:2014 EBS EN 73:2014EN 73:2014 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2
11、Principle 5 3 Equipment 5 4 Test specimens 5 5 Procedure .6 6 Destination of the test specimens after the evaporative ageing procedure .8 7 Reference to this standard in biological test reports 8 Bibliography 9 BS EN 73:2014EN 73:2014 (E) 3 Foreword This document (EN 73:2014) has been prepared by Te
12、chnical Committee CEN/TC 38 “Durability of wood and wood-based products”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2015 and conflicting nati
13、onal standards shall be withdrawn at the latest by April 2015. 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. This document supersede
14、s EN 73:1988. Compared to EN 73:1988 the following modifications have been made: a) an Introduction has been added; b) grids have been introduced in 5.1 to carry the test specimens. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are
15、 bound to implement this European Standard: 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, Por
16、tugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 73:2014EN 73:2014 (E) 4 Introduction During its service life, preservative-treated wood can be exposed to conditions which may cause the volatilization and removal of the wood preservative thereby re
17、ducing its effectiveness. This European Standard provides a laboratory based method for ageing test blocks which are to be subject to biological testing. BS EN 73:2014EN 73:2014 (E) 5 1 Scope This European Standard specifies an evaporative ageing procedure, applicable to test specimens of wood which
18、 have been previously treated with a wood preservative, in order to evaluate any loss of effectiveness when these test specimens are subsequently subjected to biological tests. 2 Principle Test specimens are prepared for biological testing of the effectiveness of wood preservatives against either fu
19、ngi or insects using the appropriate standards methods. Test specimens are exposed, for a specified period, in a dust-free current of air of a defined velocity and temperature. 3 Equipment 3.1 A wind tunnel which is compartmented and fitted with devices for heating and distributing air. The air shal
20、l be dust-free and shall not be polluted by chemical products which could have an effect on the test results. The heating and distribution devices shall be such that the temperature and air velocity are maintained constant and uniform in each compartment. The air leaving the tunnel shall be led away
21、 in such a manner that it cannot re-enter the tunnel. 3.2 A device which: a) controls the temperature within the defined limits stated in 5.2; b) measures and records the air temperature within the defined limits as stated in 5.2. 3.3 An anemometer capable of measuring air velocity of (1 0,3) m/s. 4
22、 Test specimens 4.1 Definitions and origin The test specimens and their preparation are defined in the standards concerning the biological tests to which they are intended to be subjected. The evaporative ageing procedure shall be carried out no more than 3 months after the end of the conditioning p
23、eriod that follows the treatment of the test specimens described in the relevant biological test standard. An alternative period can be used if specified by the product supplier. This shall be stated in the test report. 4.2 Number of test specimens The number of test specimens shall allow the releva
24、nt biological tests to be carried out in accordance with the instructions in the appropriate standards, bearing in mind that the evaporative ageing procedure shall be applied equally to treated test specimens that are subjected to biological agents and to control test specimens. BS EN 73:2014EN 73:2
25、014 (E) 6 The control test specimens may be of the following kinds where required by the relevant test standard: treated control test specimens that will not be subjected to attack by biological agents after the evaporative ageing procedure. These will serve as controls for changes in mass in those
26、tests in which this factor is taken into consideration; untreated control specimens which, after evaporative ageing, are subjected to the test by biological agents, to check any variation in the behaviour of untreated wood. 5 Procedure 5.1 Arrangement of the test specimens Arrange the test specimens
27、 in the compartments on grids made from metal or any other inert material which can be decontaminated, resting them with one of their faces on the base so that none of the other faces is less than 10 mm from the side partitions. The faces parallel to the grain of the wood shall be parallel to the ge
28、neral direction of air flow and they shall be at least 10 mm from the corresponding faces of the adjacent test specimens. Do not place in the same compartment either test specimens treated with different products or with different concentrations or loadings of the same product or treated and control
29、 specimens. Arrange the test specimens according to type, as follows: Test specimens treated on all surfaces Rest the test specimens on one of the small faces parallel to the grain of wood with the faces that are perpendicular to the grain of the wood at least 20 mm away from the corresponding faces
30、 of adjacent test pieces. For example, specimens intended for testing in accordance with EN 113 (basidiomycetes). Test specimens for which the faces perpendicular to the grain of wood are sealed before treatment Arrange the test specimens as above. The sealed faces may, however, be brought closer to
31、gether. For example, specimens intended for testing in accordance with EN 118 (termites). Test specimens with one treated face only Rest the test specimens on the opposite face to that which has been treated. For example, test specimens intended for the test determining preventive action against ter
32、mites (EN 118) and the larvae of Hylotrupes bajulus. 5.2 Starting and adjustment of the apparatus With the test specimens in position, establish an air current controlled at a temperature of (40 2) C which enters the compartments at a speed of (1 0,3) m/s. 5.3 Procedure Maintain the test specimens i
33、n the arrangement specified in 5.1 and under the conditions specified in 5.2 for two weeks (14 days). BS EN 73:2014EN 73:2014 (E) 7 In order to obtain homogeneous evaporation from all the treated faces of a test specimen, rotate the test specimens through an angle of 180 on its small horizontal axis
34、 every two week (14 days) period (see Figure 2). Test specimens with only one treated surface shall be rotated through an angle of 180 on their vertical axis every two weeks (14 days) period (see Figure 3). If a compartment contains more than one test specimen, at the same time as rotating the test
35、specimens, change the position of the specimens within this compartment, the method depending on the number of test specimens which it contains and on the duration of the procedure (see Figure 1). a) Position of test specimens in 1st week b) Position of test specimens in 2nd week c) Position of test
36、 specimens in 3rd week Each progressive move is associated with a rotation (see Figures 2 and 3). Figure 1 Movement of test specimens in a compartment containing more than one test specimen BS EN 73:2014EN 73:2014 (E) 8 Figure 2 Rotation of test specimen with 4 or 6 treated surfaces through an angle
37、 of 180 on its small horizontal axis NOTE The specimen rests on the untreated surface that is opposite the treated surface. Figure 3 Rotation of test specimen with only one treated surface through an angle of 180 on its vertical axis 5.4 Exposure period in the tunnel The duration of the exposure per
38、iod is 12 weeks. For certain specific applications alternative periods of ageing may be used, in which case the ageing period should be mentioned in the report of the biological test concerned. 6 Destination of the test specimens after the evaporative ageing procedure After completion of the ageing
39、procedure and the post exposure conditioning period the test specimens shall be subject to biological tests within 3 months. 7 Reference to this standard in biological test reports Quote the evaporative ageing procedure by giving the number of this European Standard (i.e. EN 73), the duration of eva
40、porative ageing period and the date of the start of the biological tests in the test report for each biological test. The duration and conditions of storage of the test specimen between initial preparation and the start of the ageing procedure shall also be reported. Any deviation from the method de
41、scribed in this standard shall be reported in the test report. BS EN 73:2014EN 73:2014 (E) 9 Bibliography 1 EN 113:1996, Wood preservatives Test method for determining the protective effectiveness against wood destroying basidiomycetes Determination of the toxic values 2 EN 117, Wood preservatives D
42、etermination of toxic values against Reticulitermes species (European termites) (Laboratory method) 3 EN 118, Wood preservatives Determination of preventive action against Reticulitermes species (European termites) (Laboratory method) 4 EN 599-1, Durability of wood and wood-based products Efficacy o
43、f preventive wood preservatives as determined by biological tests Part 1: Specification according to Use Class This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information
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