1、Wood preservatives Accelerated ageing of treated wood prior to biological testing - Leaching procedure English version of DIN EN 84 DIN EN 84 - EUROPEAN STAN DAR D EUROPISCHE NORM NORME EUROPENNE EN 84 January 1997 ICs 71.1 00.50 Descriptors: Wood preservatives, testing. English version Supersedes E
2、N 84:1989. Wood preservatives Accelerated ageing of treated wood prior to biological testing - Leaching procedure Produits de prservation du bois - Epreuves de vieillissement acclr des bois traits avant essais biologiques - Epreuve de dlavage Holzschutzmittel - Beschleunigte Alterung von behandeltem
3、 Holz vor biologischen Prfungen - Auswaschbeanspruchung This European Standard was approved by CEN on 1996-12-25. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any al
4、teration. 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. The European Standards exist in three official versions (English, French, German). A version in any other language made by tran
5、slation under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
6、rg, the Nether-lands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1997. CEN - All rights of exploitation in an
7、y form and by any means reserved worldwide for CEN national members. Ref. No. EN 84: 1997 E Page 2 EN 84: 1997 Contents Foreword 2 1 Scope 3 2 Normative reference . 3 3 Principle , . 3 4 Material and apparatus . 3 5 Test specimens . . . . . . . . . . . . . . . . . . . 4 6 Procedu re,.,. 5 7 Destinat
8、ion of the test specimens after the leaching procedure 6 a Test report . 6 Foreword This European Standard has been prepared by Technical Committee CENTTC 38 “Durability of wood and derived materials“, the Secretariat of which is held by AFNOR. This European Standard supersedes EN 84:1989. This Euro
9、pean 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 latest by July 1997. According to the CENICENELEC Internal Regulations, the national
10、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, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Page 3 EN 84:1997 1 sc
11、ope 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 test ; or
12、 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 which may o
13、r 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. For dated
14、 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 IS0 3696 Water for analytical laboratory use - S
15、pecification and test methods (IS0 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 appropri
16、ate standard methods. 4 Material and apparatus 4.1 Material Water, complying with grade 3 of EN IS0 3696. 4.2 Apparatus 4.2.1 Conditioning chamber controlled at a temperature of (20 f 2) “C and (65 f 5) YO relative humidity for conditioning the test specimens. 4.2.2 Test vessels of material that doe
17、s not react with the preservative under test : - either of glass, especially for the organic solvent products ; Page 4 EN 84: 1997 The capacity of the test vessels shall be such that they can contain, in addition to the test specimens, the volume of water specified in 6.1.2. 4.2.3 Vacuum desiccator,
18、 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 specimens. 4.2.6 Ordinary laboratory equipment. 5 Test
19、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 conditioning period that follows the treatment of the te
20、st 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 procedure shall be applied both to treated test sp
21、ecimens 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 subjected to attack by biological agents after leaching. These will serve as controls for changes in mass in those tests in
22、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 behaviour of untreated wood. One set of thes
23、e 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 5 EN 84:1997 6 Procedure 6.1 Leaching 6.1 .l Impregnation with water Place the test specimens in the test vessels (see 4.2.2) so that the test
24、specimens of different species of wood and with different concentrations of a wood preservative are in separate test vessels. Ballast them with weights (see 4.2.5) to prevent them from floating. Pour sufficient water (see 4.1) into the test vessels to cover the groups of test specimens and to ensure
25、 that the test specimens remain covered throughout the impregnation. Place the test vessels in the vacuum desiccator (see 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 vessels for 2 h. Empty the water fro
26、m the vessels. 6.1.2 Immersion in water Refill each vessel with fresh water (see 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 mm x 25 mm x 15 mm). NOTE : It is not necessary to continue to ballast the test specimens as the
27、y 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 (see 4.2.1) with nine changes of the water as follows. - change the water at the en
28、d 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 (see 4.2.1), on one of their narrow sides on a non-absorb
29、ent 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 mass .e
30、. until two consecutive weighings 24 h apart are the same f 0,l g. Page 6 EN 84: 1997 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 for exposing the test specimens to the test organisms (insects or fungi). 8 Testreport Quote the leaching procedure by giving the number of this European Standard (.e. EN 84) in the test report for each biological test.
