1、Durability of wood and wood-based products Wood-based panels Method of test for determining the resistance against wood-de stroying basidiomycetes ICs 79.060.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW DD ENV 12038:2002 DD ENV 12038:2002 Amd.No. National foreword Date C
2、omments This Draft for Development is the English language version of ENV 12038:2002. It supersedes DD ENV 12038:1996 which is withdrawn.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 natur
3、e because there is at present insufficient experience in the use of this test method. 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 ofthis Draft for Development are requested so that UK e
4、xperience can be reported to the European organization responsible fa its conversion into 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 three-year life. Th
5、e commencement of the review period will be notified by an announcement in 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 prestandard
6、or to withdraw it. Comments should be sent in writing to the Secretary ofBSI Subcommittee B/5 15/4, Assessment of preservation efficacy, at 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 lis
7、t 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 this document may be found in the BSI Standards Catalogue under the section entitled “Internat
8、ional Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. This Draft for Develoument. having been prepared under the direction of the Building and Civil Engineering Sector Summary Of pages This document comprises a front cover, an inside front
9、cover, the ENV title - - PolicyandStrategyCommittee, was published under the authority of the Standards Policy and Strategy Committee on 20 May 2002 page, pages 2 to 25 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 20 May 2002
10、ISBN O 580 38330 X EU ROPEAN PRESTAN DARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 12038 March 2002 ICs 79.060.01 Supersedes ENV 12038:1996 English version Durability of wood and wood-based products - Wood-based panels - Method of test for determining the resistance against wood-destroying basidiomy
11、cetes Durabilit du bois et des matriaux drivs du bois - Panneaux base de bois - Mthode dessai pour dterminer la rsistance aux champignons basidiomyctes lignivores Dauerhaftigkeit von Holz und Holzwerkstoffen - Holzwerkstoffplatten - Bestimmung der Bestndigkeit gegen holzzerstrende Basidiomyceten Thi
12、s European Prestandard (ENV) was approved by CEN on 23 December 2001 as a prospective standard for provisional 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 quest
13、ion whether the ENV can be converted into a European Standard. CEN members are required to announce the existence 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 forc
14、e (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, N
15、orway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worl
16、dwide for CEN national Members. Ref. No. ENV 12038:2002 E ENV 12038:2002 (E) Contents page Foreword 4 Introduction . 5 1 2 3 4 5 5.1 5.2 5.3 6 6.1 6.2 7 7.1 7.2 7.3 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 9 10 11 Annex A . 1 A.2 A.3 Scope 6 Normative references 6 Term and definition 6 Principle 6 Test mat
17、erials . 7 Biological material . 7 Other materials and reagents . 8 Apparat us . 9 Test product . 9 General 9 Test specimen preparation . Numbers of test specimens 10 Test product specimens I 0 Virulence control specimens 1 0 Size control specimens . IO Procedure . Pre-conditioning . 11 Initial dry
18、mass . 11 Preparation of the culture vessels . 12 Inoculation 12 Exposure of test specimens . 12 Sterilization of test specimens . 12 Culture conditions and duration of the test 13 Assessment of the test 13 Validity of the test 14 Assessment of results . 14 Test report 14 A (informative) Test fungi
19、16 General information on maintenance and acquisition of test strains 16 Maintenance and treatment of test fungi . 16 Information regarding obligatory fungi . 16 Annex B (informative) Recommended but non-comprehensive list of optional fungi 18 Annex C (informative) Culture vessels . 19 Annex D (norm
20、ative) Methods of sterilization . 20 D.l Ionizing radiation . 20 D.2 Steam 20 Annex E (normative) Calculation of the decay susceptibility index (DSI) 21 E.l Principle 21 E.2 Calculation 21 Annex F (informative) Example of a test report . 22 2 ENV 12038:2002 (E) Bibliography 25 3 ENV 12038:2002 (E) F
21、oreword This document ENV 12038:2002 has been prepared by CEN /TC 38 “Durability of wood and wood-based products“, the secretariat of which is held by AFNOR. This document supersedes ENV 12038:1996. Annexes A, B, C and F are informative. Annexes D and E are normative. According to the CENKENELEC Int
22、ernal Regulations, 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, Malta, Netherlands, Norway, Portugal, Spain, Sweden, S
23、witzerland and the United Kingdom. 4 ENV 12038:2002 (E) I nt rod u cti on This European Prestandard describes a laboratory test method in which small samples of the wood-based panel product under test are exposed to attack by a range of wood-destroying basidiomycete fungi in pure culture. The thickn
24、ess of the test specimens varies, since it is dictated by the thickness of the wood-based panel product under test. In order to make comparisons of the decay resistance of wood-based panel products of different thicknesses, solid wood specimens of the same dimensions as the wood-based panel product
25、test specimens are included. The effect of constituents giving temporary protection is avoided by testing after pre-conditioning of the cut specimens in a freely ventilated environment. The test method also includes a minimum moisture uptake requirement. The procedures described in this prestandard
26、method are intended to be carried out by suitably trained and/or supervised specialists. Appropriate safety precautions should be observed throughout the use of this prestandard. 5 ENV 12038:2002 (E) 1 Scope This European Prestandard specifies a method for assessing the resistance of wood-based pane
27、l products to attack by wood-destroying basidiomycete fungi growing in pure culture. The method is applicable to uncoated, rigid wood-based panel products. It is applicable to the determination of the decay resistance of wood-based panel products: - made from naturally durable materials; - made from
28、 materials treated with preservatives prior to manufacture; - treated with a preservative which is introduced during manufacture, for example as an additive to the adhesive; - treated with preservative after manufacture. NOTE 1 This method can be used in conjunction with an appropriate ageing proced
29、ure, for example EN 73 or EN 84. NOTE 2 Wood-based panel products that have received a preservative treatment after manufacture can be susceptible to attack through the cut edges of the test specimens and the decay resistance indicated can be less than that of complete panels used in service. 2 Norm
30、ative references This European Prestandard incorporates 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 revision
31、s of any of these publications apply to this European Prestandard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 73, Wood preservatives - Accelerated ageing tests of treated wood prior
32、 to biological testing - Evaporative ageing procedure. EN 84, Wood preservatives - Accelerated ageing tests of treated wood prior to biological testing - Leaching procedure. EN IS0 3696, Water for analytical laboratory use - Specification and test methods (IS0 3696: 1987). 3 Term and definition For
33、the purposes of this European Prestandard, the following term and definition apply. 3.1 supplier the sponsor of the test 4 Principle Specimens prepared from the wood-based panel product(s) under test, after pre-conditioning, and control specimens of defined function are exposed to attack by pure cul
34、tures of wood-destroying basidiomycete fungi. After a prescribed period of incubation under defined conditions, the loss in dry mass of the specimens is used as the criterion for determining the extent of attack. This, in comparison with the loss in mass of the size control specimens, is used to est
35、imate the resistance of the wood-based panel product(s) to attack by the test fungi. 6 ENV 12038:2002 (E) 5 Test materials 5.1 Biological material 5.1 .I Test fungi 5.1.1.1 - Coniophora puteana (Schumacher ex Fries) Karsten (BAM Ebw. 15) Obligatory test fungi for all types of panel products (see als
36、o annex A): Loss in mass of Scots pine sapwood virulence control specimens in16 weeks: a mass fraction of minimum 20 % - Pleurotus ostreatus (Jacquin ex Fries ) Qulet (FPRL 40C) Loss in mass of beech virulence control specimens in 16 weeks: a mass fraction of minimum 20 % 5.1.1.2 Species to be used
37、compulsorily on the nature of the test product (see also annex A): For test products made only from softwood: - Gloeophyllum trabeum (Persoon ex Fries ) Murrill (BAM Ebw. 109) Loss in mass of Scots pine sapwood virulence control specimens in16 weeks: a mass fraction of minimum 20 % For test products
38、 made only from hardwood: - Coriolus versicolor (Linnaeus) Qulet (CTB 863A) Loss in mass of beech virulence control specimens in 16 weeks: a mass fraction of minimum 20 % For test products made from a mixture of softwood and hardwood, both Gloeophyllum trabeum and Coriolus versicolor s ha I I be use
39、d. 5.1.1.3 Optional test fungi For specific regional uses or conditions, it is also possible to choose other fungi on an optional basis). 5.1 .I .4 Maintenance of strains The strains shall be maintained and treated (frequency of subculturing, alternation of culture media etc.) in accordance with the
40、 instructions from their laboratory of origin (see annex A). The parent strain shall be maintained in the laboratory of its origin, so as to conserve and assure its vigour. If tests are not undertaken regularly, or if a strain shows signs of degeneration, a new standard culture of the strain shall b
41、e obtained from the laboratory of origin for each test. When new strains are received, the virulence shall be tested to ensure that the mass loss achieved is above the minimum value given in annex A or annex B. 5.1.2 Solid wood stock 5.1.2.1 Wood species The following species shall be used for the t
42、est: - Scots pine sapwood (finus sylvestris Linnaeus) - Beech (Fagus sylvatica Linnaeus) ) See annex B for a non-comprehensive list of recommended optional fungi. 7 ENV 12038:2002 (E) 5.1.2.2 Quality of the wood The wood shall be free from visible cracks, stain, decay, insect damage or other defects
43、. The wood shall not have been water-stored, floated, chemically treated or steamed. 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 growth rings per 10 mm. The proport
44、ion of latewood 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 2 and 6 annual growth rings per 10 mm. 5.1.2.3 Virulence control specimens Prepare planed strips from the solid wood stock having a cros
45、s-section (25 f 0,5) mm x (15 f 0,5) mm. The longitudinal faces shall be parallel to the direction of the grain. The annual rings shall not be parallel to the faces (contact angle greater than IO“) but otherwise can run in any direction. Make transverse cuts, neatly to give sharp edges and a fine-sa
46、wn finish to the end-grain surfaces, to give virulence control specimens (50 f 0,5) mm long. The dimensions of each virulence control specimen at a mass fraction of (12 f 2) % moisture content2) shall be (50 f 0,5) mm x (25 f 0,5) mm x (15 f 0,5) mm. The specimens shall originate from a minimum of t
47、hree trees or shall be taken from a stock originally of more than 500 specimens. 5.1.2.4 Size control specimens Prepare planed strips from the solid wood stock having a cross-section (50 f 0,5) mm x thickness3) of the wood- based panel product under test. Make transverse cuts, neatly to give sharp e
48、dges and a fine-sawn finish to the end-grain surfaces, to give size control specimens (50 f 0,5) mm long. The annual rings of the specimens shall be orientated as for the virulence control specimens (5.1.2.3). The dimensions of each size control specimen at a mass fraction of (12 f 2) % moisture con
49、tent) shall be (50 f 0,5) mm x (50 f 0,5) mm x thickness of the wood-based panel product. The oven dry density shall be (0,48 f 0,051) g/cm3 for the Scots pine specimens and (0,67 f 0,051) g/cm3 for the beech specimens. 5.2 Other materials and reagents 5.2.1 Water Water conforming to grade 3 of EN IS0 3696 shall be used throughout. 5.2.2 Culture medium The culture medium is a malt agar medium with the following composition: - malt extract : in concentrated form: (50 f 0,5) g; in powder form: (40 f 0,5) g. - agar causing no inhibition of growth of fungi: (20 f 0,5) g to
