1、DRAFT FOR DEVELOPMENTDD CEN/TS 15397:2006Wood preservatives Method for natural preconditioning out of ground contact of treated wood specimens prior to biological laboratory testICS 71.100.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40
2、g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58DD CEN/TS 15397:2006This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48747 4National forewordThis Draft for Develop
3、ment is the official English language version of CEN/TS 15397:2006.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature because the Technical Committee need some time to collect the data in
4、this relatively new area of technology. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European orga
5、nization responsible for its conversion to a European standard. A review of this publication will be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its 3-year life. Notification of the start of the review period will b
6、e made in an announcement in the appropriate issue of Update Standards.According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European standard, to extend the life of the Technical Specification or to with
7、draw it. Comments should be sent in writing to the Secretary of BSI Technical Committee B/515, Wood preservation, at British Standards House, 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text.A li
8、st of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Stand
9、ards 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 contract. Users are responsible for its correct application.Summary of pagesThis document compri
10、ses a front cover, an inside front cover, the CEN/TS title page, pages 2 to 14, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsTECHNICAL SPECIFICATIONSPCIFI
11、CATION TECHNIQUETECHNISCHE SPEZIFIKATIONCEN/TS 15397May 2006ICS 71.100.50English VersionWood preservatives - Method for natural preconditioning out ofground contact of treated wood specimens prior to biologicallaboratory testProduits de prservation du bois - Mthode deprconditionnement naturel dprouv
12、ettes de bois trait,sans contact avec le sol, avant essai biologique enlaboratoireHolzschutzmittel - Verfahren zur natrlichenVorkonditionierung ohne Erdkontakt fr behandelte Holz-Prfkrper vor biologischer LaborprfungThis Technical Specification (CEN/TS) was approved by CEN on 11 March 2006 for provi
13、sional 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 theircomments, particularly on the question whether the CEN/TS can be converted into a European Standard.CEN members are required to announce t
14、he existence of this CEN/TS in the same way as for an EN and to make the CEN/TS availablepromptly 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/T
15、S into an EN is reached.CEN members are the 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, Slove
16、nia, Spain, Sweden, Switzerland and United Kingdom.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 natio
17、nal Members.Ref. No. CEN/TS 15397:2006: E2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Principle5 4 Materials .5 5 Apparatus .5 6 Wood test specimens6 7 End-sealing prior to exposure9 8 Labelling .9 9 Exposure to natural conditions9 10 Duration of the natural precond
18、itioning procedure 12 11 Preparation of test specimens and stakes for biological tests . 12 12 Reference in the test report. 13 Bibliography. 14 DD CEN/TS 15397:20063 Foreword This Technical Specification (CEN/TS 15397:2006) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and
19、wood-based products”, 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 CEN Technical Specification: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finl
20、and, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. DD CEN/TS 15397:20064 Introduction For use of class 3 according to EN ISO 335-1 fie
21、ld tests, like those described in EN 330 and ENV 12037, are a valuable means of studying the performance of a wood preservative. However, they are questionable as a basis of approvals of wood preservatives for some reasons: The abiotic factors of outdoor exposure, such as wind, temperatures, UV radi
22、ation and rain can in combination with biotic factors change or depreciate the applied wood preservative to such an extent as to allow decay. A low frequency of precipitation and the duration of temperatures below or slightly above the freezing point can, however, in some areas of Europe hinder the
23、development of fungi and a resulting visible deterioration. Likewise the effectiveness against wood-boring beetles can also be reduced although infestation of the timber can not occur because the weather conditions in a particular field will not promote cracking of the timber - a prerequisite for ov
24、iposition of for instance the house longhorn beetle. Furthermore under natural conditions fungal attack and insect infestation can be quite accidental, leading to remarkable variations and therefore possible misinterpretations of the test results. Therefore - in a project supported by the Commission
25、 of the European Communities 1 to preclude such disadvantages - a method was developed and tested with a number of the most commonly used wood preservatives. In this method the treated wood specimens were exposed without soil contact to the natural abiotic and biotic ageing factors, the complexity o
26、f which cannot - or only incompletely - be simulated with the available artificial ageing methods EN 73 and EN 84. After defined periods of outdoor exposure, attack of wood-destroying fungi and/or insects were examined under controlled laboratory conditions according to the relevant European Standar
27、ds. The applicability of this principle to a number of typical European climates was confirmed in a further project also supported by the Commission of the European Communities2. With some amendments to the method used in the projects, this document is based on this principle.DD CEN/TS 15397:20065 1
28、 Scope This CEN Technical Specification specifies a method of natural preconditioning for wood specimens treated with a wood preservative either by penetrating processes or by surface application that can be used in conjunction with existing European Standards on testing of the preventive action of
29、wood preservatives against basidiomycetes and/or insects. 2 Normative references Not applicable 3 Principle Wood test specimens treated with a wood preservative according to relevant biological test methods are exposed to natural outdoor conditions in a test field. The test specimens are fixed on a
30、rack facing the prevailing weather under 45. If brush treatment, dipping, steeping or double vacuum treatment is recommended, instead of the test specimens described in the relevant European Standards, end-sealed wood stakes with a cross section equal to the cross section of the test specimens in th
31、e relevant test methods can be used. After different periods of outdoor exposure the standard test specimens and end-sealed test specimens derived from the stakes by cutting to a length of 50 mm are exposed to biological laboratory tests as for instance those described in EN 46-1,EN 46-2, EN 47, EN
32、113 or ENV 839 respectively. 4 Materials 4.1 End-seal compounds 4.1.1 Preservative resistant end-seal A material resistant to the penetration of the test preservative solutions. NOTE Polyvinyl acetate (PVAc) glues have been found to be suitable for many organic solvent formulations. For water-borne
33、formulations the weatherproof end-seal (4.1.2) may be used. 4.1.2 Weatherproof end-seal A material which prevents water entry as well as microbial infection and remains effective during long term exposure to the weather. NOTE Two coats of an epoxy-resin/pitch compound have been found to be suitable.
34、 5 Apparatus 5.1 Sawing equipment A sawing machine capable of producing a fine sawn finish. 5.2 Drilling machine and drills DD CEN/TS 15397:20066 5.3 Conditioning chamber, well ventilated and controlled at (20 2) C and (65 5) % relative humidity. 5.4 Ventilated drying oven, capable of being maintain
35、ed at (103 3) C. 5.5 Desiccators, with efficient desiccant (silica gel for example). 5.6 Equipment, suitable for carrying out the treatment specified by the supplier. 5.7 Balance, capable of weighing to the nearest 0,01 g. 5.8 Safety equipment and protective clothing, appropriate for the test produc
36、t, to ensure the safety of the operator. 5.9 System for fixing stakes in the exposure rack: tubular copper rivets, plastic sticks and spiral springs of stainless steel. 5.10 Labels, inert, long-lasting labels and corrosion resisting fixing pins. 5.11 Exposure racks: Aluminium racks (see Figures 1 an
37、d 2) that allow test specimens or stakes to face the prevailing weather1under 45, approximately 1 m above ground level. 5.12 Ordinary laboratory equipment. 6 Wood test specimens 6.1 Specimens according to the relevant biological test methods 6.1.1 General The test specimens and their preparation inc
38、luding treatment and post treatment conditioning are defined in the documents concerning the biological tests to which they are intended to be subjected. The relevant test standards are those standards where the test specimens have the dimensions 15 mm x 25 mm x 50 mm. These include EN 46-1,EN 46-2,
39、 EN 47, EN 113 or ENV 839. The natural preconditioning procedure shall be carried out at the end of the conditioning period that follows the treatment of the specimens described in the relevant biological test standard. 6.1.2 Number of test specimens The number of test specimens shall allow the rele
40、vant biological tests to be carried out in accordance with the instructions in the appropriate documents, bearing in mind that the natural preconditioning procedure shall be applied both to treated specimens that are subjected to biological agents and to control test specimens. The control test spec
41、imens are of the following kinds: - treated test specimens that will not be subjected to attack by biological agents after natural preconditioning. These will serve as controls for changes in mass in those tests in which this factor is taken into consideration. One set of control test specimens will
42、 be needed for each concentration and period of exposure; 1In most of the European areas this would normally be south-west DD CEN/TS 15397:20067 - untreated control test specimens which, after natural preconditioning, are subjected to the biological tests to check any variation in the behaviour of u
43、ntreated wood. One single set of test specimens shall be provided for each exposure period; - control test specimens treated with the solvent or diluent for each period of exposure if necessary. 6.2 Stakes 6.2.1 General If superficial treatment is recommended by the supplier of the test preservative
44、, stakes can be used as an alternative. If so, the stakes shall have a cross section of (25 0,5) mm x (15 0,5) mm and an appropriate length which can be a multiple of (50 0,5) mm (the length of the test specimens in these include EN 46-1,EN 46-2, EN 47, EN 113 or ENV 839). 6.2.2 Species of wood for
45、stakes The reference species are the species mentioned in the relevant documents for the subsequent biological laboratory tests. If no requirements are given, e.g. in the case of intended double vacuum treatment, the reference species are Scots pine, Pinus sylvestris Linnaeus, and beech (Fagus sylva
46、tica Linnaeus). Additional tests can be undertaken using other species but, if so, this shall be stated in the test report. 6.2.3 Quality of wood The wood shall be free from visible cracks, stain, decay, insect damage and other defects. The wood shall not have been water-stored, floated, chemically
47、treated or steamed. The wood shall originate from trees preferably felled in winter. NOTE Wood that has been kiln dried at temperatures below 60 C may be used. The Scots pine shall be exclusively sapwood containing little resin and having between 2,5 and 8 annual rings per 10 mm. The proportion of l
48、atewood in the annual rings shall not exceed 30 % of the whole. The beech shall be even-grained, free from tyloses and discoloration. It shall have between two and six annual rings per 10 mm. Use only sound sapwood, straight-grained and without knots. 6.2.4 Provision of stakes Prepare planed strips
49、having a cross-section of (25 0,5) mm x (15 0,5) mm removing a minimum of 2 mm from any surfaces exposed during drying. The longitudinal faces shall be parallel to the direction of the grain. The annual rings shall run in a direction specified in the European Standards to be used after the natural preconditioning periods. Make transverse cuts, neatly to give sharp edges and a fine-sawn finish to the end-grain surfaces, to give test longitudinal dimensions specified in 6.2.5. Avoid using stakes directly from the butt or crown of the tree. The stake
