1、PUBLISHED DOCUMENT PD CEN/TR 15046:2005 Wood preservatives Artificial weathering of treated wood prior to biological testing UV-radiation and water-spraying procedure ICS 71.100.50 PD CEN/TR 15046:2005 This British Standard was published under the authority of the Standards Policy and Strategy Commi
2、ttee on 15 April 2005 BSI 15 April 2005 ISBN 0 580 45831 8 National foreword This Published Document is the official English language version of CEN/TR 15046:2005. The UK participation in its preparation was entrusted by Technical Committee B/515, Wood preservation, to Subcommittee B/515/2, Durabili
3、ty, treatment, performance and environmental issues, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in thi
4、s document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a con
5、tract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals
6、for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the CEN/TR title page, pages 2 to 13 and a back cover. The BSI copyright notice displa
7、yed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsTECHNICALREPORT RAPPORTTECHNIQUE TECHNISCHERBERICHT CEN/TR15046 March2005 ICS71.100.50 Englishversion WoodpreservativesArtificialweatheringoftreatedwoodprior tobiologicaltestin
8、gUVradiationandwatersprayingprocedure ProduitsdeprservationduboisExpositionartificielleaux intempriesdesboistraitsavantessaisbiologiques EpreuvesderayonnementUVetdepulvrisationdeau HolzschutzmittelKnstlicheBewitterungvonbehandeltem HolzvorbiologischenPrfungenBeanspruchungmitUV StrahlungundWassersprh
9、en ThisTechnicalReportwasapprovedbyCENon3February2005.IthasbeendrawnupbytheTechnicalCommitteeCEN/TC38. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherla
10、nds,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwidef
11、orCENnationalMembers. Ref.No.CEN/TR15046:2005:ECEN/TR 15046:2005 (E) 2 Contents Page 1 Scope 5 2 Principle5 3 Material and apparatus5 3.1 Material .5 3.2 Apparatus .5 4 Test specimens7 4.1 Definition and origin7 4.2 Number of test specimens7 5 Procedure .7 5.1 Artificial weathering 7 5.2 Duration of
12、 the artificial weathering procedure10 5.3 Drying10 5.4 Repairing the end-sealing.10 6 Destination of the test specimens after the artificial weathering procedure 10 7 Test report 10 Annex A (informative) Example of a suitable test specimens holder 11 CEN/TR 15046:2005 (E) 3 Foreword This document (
13、CEN/TR 15046:2005) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and derived materials”, the secretariat of which is held by AFNOR. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this T
14、echnical Report: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CEN/TR
15、15046:2005 (E) 4 Introduction This document is based on the results of the S.M.T. Project: F.A.C.T, SMT 4 CT 96 2135 and in particular in accordance with the findings of Task 1 which consisted of a study of artificial weathering techniques for the conditioning of treated test blocks prior to biologi
16、cal test. (see the summary of the research in CEN/TR 14723) CEN/TR 15046:2005 (E) 5 1 Scope This document specifies a method for the artificial weathering of test specimens of treated wood, which are used in the testing of the biological efficacy of wood preservatives. This method is applicable to:
17、a) the pre-conditioning of test specimens prior to their being subjected to a biological test; or b) assessment of loss of effectiveness by comparing the performance in a biological test of treated test specimens subjected to this procedure with others that have not undergone any artificial weatheri
18、ng procedure. NOTE The method can also be used for pre-conditioning of wood-based panel products, which may or may not have received preservative treatment. 2 Principle Artificial weathering for a specified period in a device providing UV-radiation and spraying of demineralised water, of test specim
19、ens that have been prepared for biological testing of the efficacy of a wood preservative against fungi or insects, using the appropriate standard methods. 3 Material and apparatus 3.1 Material 3.1.1 Water, demineralised. NOTE For example water conforming to the grade 3 specified in EN ISO 3696 may
20、be used. 3.1.2 End-sealing material, according to the specifications recommended in the standard test method to be applied after the artificial weathering. 3.2 Apparatus 3.2.1 Test chamber The test chamber is made from corrosion resistant material in which are housed the lamps, a heated water tray,
21、spray nozzles and test specimen racks. 3.2.1.1 Lamps The UV lamp emits UV light from a low pressure mercury arc. The required spectral distribution is achieved by a careful selection of the type of phosphor coating on the inner surface of the lamp and the nature of the glass used in the construction
22、 of the tubes. Unless otherwise specified or mutually agreed the lamp shall be of the following type: Lamp, commonly called UVA 340, has a peak emission at 340 nm and the relative spectral irradiance is given in Table 1. CEN/TR 15046:2005 (E) 6 Table 1 Relative spectral irradiance of lamp Wavelength
23、 Relative spectral irradiance a nm % 270 400 270 270 280 280 300 300 320 320 340 340 360 360 380 380 400 100 0 0 0 7,8 0,8 29,6 3,0 34,4 3,4 20,9 2,1 7,3 0,7 aThe spectral irradiance between 270 nm and 400 nm is defined as 100 %. 3.2.1.2 Device for wetting the test specimens The test specimens shall
24、 be wetted by spray of water. To prevent spotting on to the test specimens water demineralised (3.1.1) shall be used. The spray water shall not be used in a circulation system. Note A spraying device could be capable to spray about 3 l/min. Intermittent spray, e.g. 5 s spray followed by 15 s rest sh
25、ould be programmable to save water. 3.2.1.3 Black panel thermometer Set the apparatus to operate at the specified parameters, and the temperature shall be monitored by a remote sensor attached to the black panel. The black panel thermometer shall be exposed to the same exposure conditions as the spe
26、cimens. The black panel thermometer shall be calibrated in accordance with the manufacturers recommendations. 3.2.1.4 Irradiance control Apparatus equipped with an irradiance control system shall be calibrated in accordance with the manufacturers recommendations. Lamps in apparatus without irradianc
27、e control system need to be rotated and replaced in accordance with the manufacturers recommendations to compensate for lamp ageing. CEN/TR 15046:2005 (E) 7 3.2.2 Test specimens holder The test specimens holder shall be of stainless steel. They shall guarantee a sufficient distance between the test
28、specimens and the holder sheet in order not to hinder the runoff of the spray water and a fixed distance to the UV- lamps. An example of a suitable test specimens holder is given in Annex A. 3.2.3 Deep-freezer controlled at a temperature of (- 18 2)C. 3.2.4 Conditioning chamber controlled at a tempe
29、rature of (20 2) C and (65 5) % relative humidity for conditioning the test specimens. 4 Test specimens 4.1 Definition 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 artificial weatherin
30、g procedure shall be carried out at the end of the conditioning period that follows the treatment of the test specimens described in the relevant biological test standard. 4.2 Number of test specimens The number of test specimens to be artificially weathered shall be as required by the standard desc
31、ribing the relevant biological tests, bearing in mind that the weathering procedure shall be applied both to treated test specimens that are subjected to biological agents and to control test specimens. The control test specimens are of the following kinds: treated test specimens that are not be sub
32、jected to attack by biological agents after artificial weathering. These will serve as controls for changes in mass in those tests in which this factor is taken into consideration. One set of these control test specimens shall be provided for each concentration; untreated control test specimens, whi
33、ch, after artificial weathering, are subjected to the biological tests to check any variation in the behaviour of untreated wood. One set of these control test specimens shall be provided for the whole of one test; control test specimens of timber treated with solvent or diluent if necessary. 5 Proc
34、edure 5.1 Artificial weathering Fix the test specimens in the test specimens holders (3.2.2 and Annex A) and insert the test specimens holders in the test chamber (3.2.1). Expose the test specimens to the weathering programme given in Table 2. NOTE The weathering procedure should start on a Tuesday.
35、 The given programme lasts 336 h. Repeat the programme twice in continuation, which means to programme the total run of the weathering device to 672 h. CEN/TR 15046:2005 (E) 8 Without switching off the weathering device , at the end of step 19 remove the test specimens holders with the test specimen
36、s in place and transfer the whole assembly to the freezer (3.2.3) and leave then there for 24 h (step 20). Transfer the test specimens in their holders to the weathering apparatus. Repeat this procedure at the end of step 23. The position of the test specimens holders in the device shall be changed
37、through rotation every 7 days. The UV exposure temperature shall not exceed 50 C. The corresponding irradiance set point shall not exceed 1,03 W/(mnm) at 340 nm The temperature of the dark (conditioning) phase shall not exceed 40 C. NOTE The flow of demineralised water should be round about 3 l/min.
38、 CEN/TR 15046:2005 (E) 9 Table 2 Artificial weathering programme Day Step N Step of the programme Duration (h:min) Cycle N 1 Tuesday 1 UV a24:00 2 Spray b04:00 3 Condc02:00 2 Wednesday 4 Spray 10:00 5 Cond 02:00 6 Spray 06:00 Thursday 7 UV 24:00 8 Spray 04:00 9 Cond 02:00 C 14 Friday 10 Spray 10:00
39、11 Cond 02:00 12 Spray 06:00 5 Saturday 13 UV 23:00 14 Cond 01:00 15 Spray 04:00 16 Cond 02:00 6 Sunday 17 Spray 10:00 18 Cond 02:00 19 Spray 06:00 7 Monday 20 Cond spe d . Meanwhile stored in the freezer 24:00 Tuesday 21 Sub-cycle step 22-23 repeat 72 x 8 13 to 22 UV 01:42 C 2Sunday 23 Spray 00:18
40、14 Monday 24 Cond spe. Meanwhile stored in the freezer 24:00 25 Final step go to step 1 Programme duration set at 672 h aUV-light bSpraying of demineralised water cConditioning no light. In some devices, this step can only be realized with the program step “Cond“ (=condensation which means productio
41、n of dew) d Special conditioning CEN/TR 15046:2005 (E) 10 5.2 Duration of the artificial weathering procedure The total duration of the artificial weathering shall be 672 h (= 4 weeks). 5.3 Drying Stand the test specimens in the conditioning chamber (see 3.2.4), on one of their narrow sides on a non
42、- absorbent support of a material which does not react with the treated test specimens and taking care to leave a gap of at least 10 mm between individual test specimens, allowing a free flow of air around the test specimens. Allow the test specimens to stand for at least two weeks or until constant
43、 mass i.e. until two consecutive weighing 24 h apart are the same 0,1 g. 5.4 Repairing the end-sealing In the case of end-sealed cross sections of specimens (e.g. for ENV 839) repair any sealing broken by the artificial weathering procedure. Use the end-sealing material recommended in the respective
44、 test standard (see 3.1.2). 6 Destination of the test specimens after the artificial weathering procedure The test specimens are suitable for use in biological tests in accordance with the appropriate standards, commencing from the clause describing the procedure for exposing the test specimens to t
45、he test organisms (insects or fungi). As the test specimens are exposed to the artificial weathering only with one of their broad faces, the exposed faces shall be laid towards the fungi on the culture media (e.g. EN 113 or ENV 839) respectively the insects shall be applied at the exposed faces (e.g
46、. EN 46 or EN 47). 7 Test report Quote the artificial weathering procedure by giving the number of this document (i.e. CEN/TR 15046) in the test report for each biological test. CEN/TR 15046:2005 (E) 11 Annex A (informative) Example of a suitable test specimens holder A suitable test specimens holde
47、r design is shown in Figures A.1 and A.2. Key 1 Metal sheet 2 Clamp of spring steel 3 Screw or weld Figure A.1 Plan view : Position of clamps (screwed or welded on) on metal sheet CEN/TR 15046:2005 (E) 12 Key 1 Wood 2 Light 3 Clamp of spring steel 4 Test specimen 5 Metal sheet 6 Screw or weld Figure
48、 A.2 Location of the test specimens within the clamps CEN/TR 15046:2005 (E) 13 Bibliography EN 46, Wood preservatives Determination of the preventive action against recently hatched larvae of Hylotrupes bajulus (Linnaeus) (Laboratory method) EN 47, Wood preservatives Determination of the toxic values against Hylotrupes bajulus (Linnaeus) larvae (Laboratory method) EN 113, Wood preservatives Test method for determining the protective effectiveness against wood destroying basidiomycetes - Determination of the toxic values ENV 839, Wood pr
