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1、DRAFT FOR DEVELOPMENT DD ENV 1099: 1998 Incorporating Amendment No. 1 Plywood Biological durability Guidance for the assessment of plywood for use in different hazard classes ICS 79.060.10 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:28 GMT+00:00 2006,
2、Uncontrolled Copy, (c) BSI DD ENV 1099:1998 This Draft for Development, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1998 BSI 03-2000 ISBN 0 580 28992 3 Amendments issued since pub
3、lication Amd. No.DateComments 10424April 1999 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ENV 1099:1998 BSI 03-2000i Contents Page National forewordii Foreword2 Text
4、 of ENV 10993 National annex NA (informative)7 Table NA.1 Plywood durability wood destroying fungi preservative treatment7 Table NA.2 Plywood preservative treatment classes8 Table NA.3 Summary of hazard classes (from BS EN 335)9 Licensed Copy: London South Bank University, London South Bank Universi
5、ty, Tue Dec 12 05:49:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD ENV 1099:1998 ii BSI 03-2000 National foreword This Draft for Development is the English language version of ENV 1099:1997. The UK participation in its preparation was entrusted to Technical Committee B/541, Wood-based panels, whi
6、ch has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. T
7、his Draft for Development includes a National annex, produced jointly by Committees B/515/2 and B/541, giving guidance on preservative treatments for use in situations where the natural durability of the timber species will be inadequate for the intended use. This guidance is similar to that contain
8、ed in BS 6566-7, which is withdrawn. 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. It should be applied on this provisional basis so that information and experience of its practical
9、 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 organization responsible for its conversion to a European Standard. A review of this publication will be initiated 2 years after its publicati
10、on by the European organization, so that a decision can be taken on its status at the end of its 3-year life. The commencement of the review period will be notified by an announcement in BSI Update. According to the replies received by the end of the review period, the responsible BSI Committee will
11、 decide whether to support the conversion into a European Standard, to extend the life of the prestandard or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee B/541 at BSI, 389 Chiswick High Road, London W4 4AL, giving the document reference and clause nu
12、mber and proposing, where possible, an appropriate revision of the text. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may b
13、e found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Sta
14、ndards are responsible for their correct application. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 9 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This wi
15、ll be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN PRESTANDARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 1099 October 1997 ICS 79.060.10 De
16、scriptors: Wood products, plywood, durability, biodegradability, estimation, classifications, operating requirements English version Plywood Biological durability Guidance for the assessment of plywood for use in different hazard classes Contreplaqu Durabilit biologique Guide pour lvaluation du cont
17、replaqu pour emploi dans les diffrentes classes de risques Sperrholz Biologische Dauerhaftigkeit Leitfaden zur Beurteilung von Sperrholz zur Verwendung in verschiedenen Gefhrdungsklassen This European Prestandard (ENV) was approved by CEN on 11 September 1997 as a prospective standard for provisiona
18、l application. The period of validity of this ENV is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the ENV can be converted into a European Standard. CEN members are required to announce the exist
19、ence of this ENV in the same way as for an EN and to make the ENV available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is re
20、ached. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Eur
21、open de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. ENV 1099:1997 E Licensed Copy: London South Bank University, London Sou
22、th Bank University, Tue Dec 12 05:49:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 1099:1997 BSI 03-2000 2 Foreword This European Prestandard has been prepared by Technical Committee CEN/TC 112 “Wood-based panels”, the secretariat of which is held by DIN. According to the CEN/CENELEC Internal Re
23、gulations, the national standards organizations of the following countries are bound to announce this European Prestandard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
24、the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Precautionary measures for use3 4.1Rules for selection3 4.2Use of treated plywood3 4.3Installation principles3 5Influence of plywood composition on biological durability4 6Use of plywood in different hazard cla
25、sses4 6.1General4 6.2Wood-destroying fungi4 6.3Insects and marine organisms5 Annex A (informative) Specific factors related to the biological durability of plywood6 Annex B (informative) Bibliography6 Table 1 Wood-destroying fungi Guidance on the application of natural durability classes of wood spe
26、cies to plywood used in various hazard classes4 Table 2 Scheme for assigning natural durability rating of plywood for the various organisms5 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 1099:1997 BSI 03-
27、20003 1 Scope This European Pre-standard gives guidances on the selection of plywood for use in the different hazard classes of biological attack as defined in EN 335-1. The guidance given takes into account the natural durability classification for solid timber (see EN 350-2) together with other fa
28、ctors specific for plywood. It does not consider durability against chemico-physical factors, such as weathering, nor does it consider the biological durability of the adhesive. Guidance on precautionary measures for use is also given. 2 Normative references This European Pre-standard incorporates,
29、by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Pre
30、-standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 313-2, Plywood Classification and terminology Part 2: Terminology. EN 335-1, Durability of wood and wood-based products Definitions of hazard classes
31、 of biological attack Part 1: General. EN 335-3:1995, Durability of wood and wood-based products Definitions of hazard classes of biological attack Part 3: Application to wood-based panels. EN 350-2:1994, Durability of wood and wood-based products Natural durability of solid wood Part 2: Guide to na
32、tural durability and treatability of selected wood species of importance in Europe. EN 460:1994, Durability of wood and wood-based products Natural durability of solid wood Guide to the natural durability requirements for wood to be used in hazard classes. 3 Definitions For the purposes of this stan
33、dard, the definitions given in EN 313-2 apply. 4 Precautionary measures for use 4.1 Rules for selection Plywood should be selected according to the relevant hazard classes of its end use situation and taking into account any risk from perceived hazards likely to occur. Five hazard classes of use hav
34、e been identified as being representative of the various conditions the material is likely to meet. These 5 classes are defined in EN 335-1 and their applications for plywood in EN 335-3. The risk of biological attack can differ for different end-uses within the same hazard class. If the hazard clas
35、s cannot be determined accurately or when different parts of the same plywood panel are exposed to different hazard classes, selection should be made with regard to the most severe of the probable hazard classes. When a plywood component would be difficult to replace, or the consequences of its poss
36、ible failure would be serious, it is advisable to use a more durable plywood than that normally appropriate for the hazard class of the end use situation. 4.2 Use of treated plywood With some preservative products, a risk of excessive leaching exists1). If the specified preservative product is leach
37、able, it is essential that the panel is covered, or otherwise protected, after treatment and during transport and construction, as well as in service. In addition to the natural biological durability of the plywood or durability conferred through preservative treatment, other factors which can affec
38、t the performance of plywood and which should be considered during development of specifications include building practice during construction, quality of maintenance, the type and integrity of surface coatings applied and the compatibility between treatments and coatings. 4.3 Installation principle
39、s Plywood should be installed and maintained in such a way that the conditions in-service are no more severe than those appropriate to the specified material. The moisture content of plywood is influenced by the gradients of temperature and water vapour between the two faces and the permeability of
40、any surface coatings applied to the faces. 1) Leaching to a level where the conferred durability is compromised. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:28 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ENV 1099:1997 4 BSI 03-2000 Where plywood intende
41、d for dry end use has become wet during installation, it should be allowed to dry thoroughly before the components or structures are sealed. In hazard classes 2 and 3 where there is a risk of wetting, but which can be minimised through design, it is important to incorporate in that design suitable d
42、etailing and adequate ventilation to ensure that a build-up and subsequent retention of water does not occur. Special attention should be paid to protecting plywood edges, e.g. by applying a low permeability finish. 5 Influence of plywood composition on biological durability The characteristics of n
43、atural durability and treatability of solid wood are set out in EN 350-2 and EN 460. These can be used as guidance for estimating the durability and treatability performance of plywood. If the plywood contains more than one wood species, the species having the lowest natural durability should be use
44、d to indicate the expected durability level of the untreated plywood and that being the most resistant to treatment should be used to indicate treatability. Choice of plywood for a particular application should be made with due consideration given to the characteristics of adhesive type, wood specie
45、s and lay up and the required life expectancy. The behaviour of plywood subjected to biological attack can differ from that of solid wood. The behaviour of plywood under different moisture regimes is affected by the wood species comprising the plies, and the nature and content of the adhesive used.
46、The equilibrium moisture content of plywood made from a single wood species can differ from that of solid wood of the same species under the same conditions. Specific factors for consideration are indicated in Annex A. 6 Use of plywood in different hazard classes 6.1 General In order to select suita
47、ble plywood, reference should be made to EN 350-2 to establish the natural durability classification of the constituent wood species against the various biological organisms associated with the hazard class in which the plywood will be used. 6.2 Wood-destroying fungi Table 1 is based on EN 460 and g
48、ives guidance, where natural durability levels are insufficient, on the need for preservative treatment. Table 1 Wood-destroying fungi Guidance on the application of natural durability classes of wood species to plywood used in various hazard classes Hazard class for plywoodb Durability class of woo
49、d species used in the pliesa 12345 100000 2000(0)(0) 300(0)()() 40(0)() 50()() Key: 0 natural durability sufficient (0) natural durability is normally sufficient but, under certain end uses, treatment can be advisable (see EN 460:1994, Annex A) () preservative treatment is normally advisible but, in certain end uses, natural durability can be sufficient (see EN 460:1994, Annex A) preservative treatment necessary a Sapwood of all species is regarded as belonging to durability class 5. b The use