BS EN 84-1997 Wood preservatives - Accelerated ageing of treated wood prior to biological testing - Leaching procedure《木材防腐剂 进行生物试验之前处理木材的加速老化 浸析程序》.pdf

《BS EN 84-1997 Wood preservatives - Accelerated ageing of treated wood prior to biological testing - Leaching procedure《木材防腐剂 进行生物试验之前处理木材的加速老化 浸析程序》.pdf》由会员分享，可在线阅读，更多相关《BS EN 84-1997 Wood preservatives - Accelerated ageing of treated wood prior to biological testing - Leaching procedure《木材防腐剂 进行生物试验之前处理木材的加速老化 浸析程序》.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 84 : 1997 The Europ

2、ean Standard EN 84 : 1997 has the status of a British Standard ICS 71.100.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Wood preservatives Accelerated ageing of treated wood prior to biological testing Leaching procedureBS EN 84 : 1997 This British Standard, having been p

3、repared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 July 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference B/515 Draft for comment 96

4、/105324 DC ISBN 0 580 27639 2 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/515, Wood preservation, upon which the following bodies were represented: Bri

5、tish Telecommunications plc British Wood Preserving and Damp-proofing Association Chemical Industries Association Creosote Council Department of the Environment (Building Research Establishment) Timber Research and Development Association Timber Trade Federation Wood Panel Industries Federation The

6、following bodies were also represented in the drafting of the standard, through subcommittees and panels: Council of the Forest Industries of British Columbia Imperial College of Science and Technology Institute of Wood ScienceBS EN 84 : 1997 BSI 1997 i Contents Page Committees responsible Inside fr

7、ont cover National foreword ii Foreword 2 Text of EN 84 3ii BSI 1997 BS EN 84 : 1997 National foreword This British Standard has been prepared by Technical Committee B/515 and is the English language version of EN 84 : 1997 Wood preservatives Accelerated ageing of treated wood prior to biological te

8、sting Leaching procedure, published by the European Committee for Standardization (CEN). It supersedes BS 5761 : Part 2 which was first published in 1980 and revised in 1990. The 1990 edition is withdrawn. EN 84 : 1997 was prepared as a result of discussion in CEN Technical Committee 38, Durability

9、of wood and wood-based products, in which the UK participated. Cross-reference Publication referred to Corresponding British Standard EN ISO 3696 : 1995 BS EN ISO 3696 : 1995 Water for analytical laboratory use. Specification and test methods Compliance with a British Standard does not of itself con

10、fer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komite

11、e fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 Copyright reserved to CEN members Ref. No. EN 84 : 1997 E EUROPEAN STANDARD EN 84 NORME EUROPE ENNE EUROPA ISCHE NORM January 1997 ICS 71.100.50 Supersedes EN 84 : 1989 Descriptors: Wood preservatives, wood, artificial agei

12、ng tests, washing tests, effectiveness English version Wood preservatives Accelerated ageing of treated wood prior to biological testing Leaching procedure Produits de pre servation du bois Epreuves de vieillissement acce le re des bois traite s avant essais biologiques Epreuve de de lavage Holzschu

13、tzmittel Beschleunigte Alterung von behandeltem Holz vor biologischen Pru fungen Auswaschbeanspruchung This European Standard was approved by CEN on 1996-12-25. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

14、the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, Germ

15、an). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, G

16、ermany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 84 : 1997 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 38, Durability of wood and derived materials, the Secretariat

17、 of which is held by AFNOR. This European Standard supersedes EN 84 : 1989. 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 July 1997, and conflicting national standards shall be withdrawn at the

18、latest by July 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway

19、, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative reference 3 3 Principle 3 4 Material and apparatus 3 5 Test specimens 3 6 Procedure 4 7 Destination of the test specimens after the leaching procedure 4 8 Test report 4Page 3 EN 84 : 1997 BS

20、I 1997 1 Scope This European Standard specifies a method for the leaching of test specimens of wood which are used in the testing of the biological efficacy of wood preservatives. This standard is applicable to: a) the pre-conditioning of test specimens prior to their being subjected to a biological

21、 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 leaching procedure. NOTE. The method may also be used for pre-conditioning of wood-based panel products whi

22、ch may or may not have received preservative treatment. 2 Normative reference This European Standard 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. F

23、or dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN ISO 3696 Water for analytical laboratory

24、 use Specification and test methods (ISO 3696 : 1987) 3 Principle Impregnation with water under vacuum, followed by immersion in water for a specified period, of test specimens that have been prepared for biological testing of the efficacy of a wood preservative against fungi or insects, using the a

25、ppropriate standard methods. 4 Material and apparatus 4.1 Material Water, complying with grade 3 of EN ISO 3696. 4.2 Apparatus 4.2.1 Conditioning chamber, controlled at a temperature of (20 2) C and (65 5) % relative humidity for conditioning the test specimens. 4.2.2 Test vessels, of material that

26、does not react with the preservative under test: either of glass, especially for the organic solvent products; or of plastic materials for products that are likely to attack glass. The capacity of the test vessels shall be such that they can contain, in addition to the test specimens, the volume of

27、water specified in 6.1.2. 4.2.3 Vacuum desiccator, fitted with a stopcock. 4.2.4 Vacuum pump, fitted with a pressure gauge and capable of maintaining a pressure of 4 kPa. 4.2.5 Weights, of a material which does not react with the treated blocks, water or the test vessel, for ballasting the test spec

28、imens. 4.2.6 Ordinary laboratory equipment. 5 Test specimens 5.1 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 leaching procedure shall be carried out at the end of the condi

29、tioning period that follows the treatment of the test specimens described in the relevant biological test standard. 5.2 Number of test specimens The number of test specimens to be leached shall be as required by the standard describing the relevant biological tests, bearing in mind that the leaching

30、 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 subjected to attack by biological agents after leaching. These will serve as co

31、ntrols 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 which, after leaching, are subjected to the biological tests to check any variation in the be

32、haviour 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.Page 4 EN 84 : 1997 BSI 1997 6 Procedure 6.1 Leaching 6.1.1 Impregnation with water Place the test specimens i

33、n the test vessels (4.2.2)s o that the test specimens of different species of wood and with different concentrations of a wood preservative are in separate test vessels. Ballast them with weights (4.2.5) to prevent them from floating. Pour sufficient water (4.1) into the test vessels to cover the gr

34、oups of test specimens and to ensure that the test specimens remain covered throughout the impregnation. Place the test vessels in the vacuum desiccator (4.2.3); establish a vacuum corresponding to a pressure of 4 kPa and maintain this for 20 min before release. Leave the test specimens in the vesse

35、ls for 2 h. Empty the water from the vessels. 6.1.2 Immersion in water Refill each vessel with fresh water (4.1) to a ratio of approximately five volumes of water to one volume of wood (e.g. 100 ml of water per test specimen of 50 mm3 25 mm3 15 mm). NOTE. It is not necessary to continue to ballast t

36、he test specimens as they will not float after the impregnation procedure. This may not apply if panel product test specimens are being processed. Allow the test specimens to remain immersed in water for 14 days at the temperature specified (4.2.1) with nine changes of the water as follows. change t

37、he water at the end of the first and second day of immersion; change the water a further seven times in the remaining 12 days at intervals of not less than one day and not more than three days. 6.2 Drying Stand the test specimens in the conditioning chamber (4.2.1), on one of their narrow sides on a

38、 non-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 const

39、ant mass i.e. until two consecutive weighings 24 h apart are the same 0,1 g. 7 Destination of the test specimens after the leaching procedure The test specimens are suitable for use in biological tests in accordance with the appropriate standards, commencing from the clause describing the procedure

40、for exposing the test specimens to the test organisms (insects or fungi). 8 Test report Quote the leaching procedure by giving the number of this European Standard (i.e. EN 84) in the test report for each biological test. BSI 1997 BS EN 84 : 1997 List of references See national foreword.BSI 389 Chis

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