DIN EN 12490-2010 Durability of wood and wood-based products - Preservative-treated solid wood - Determination of the penetration and retention of creosote in treated wood German v.pdf

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1、November 2010 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).I

2、CS 71.100.50; 79.040!$l1“1731490www.din.deDDIN EN 12490Durability of wood and wood-based products Preservative-treated solid wood Determination of the penetration and retention of creosote in treatedwoodEnglish translation of DIN EN 12490:2010-11Dauerhaftigkeit von Holz und Holzprodukten Mit Holzsch

3、utzmitteln behandeltes Vollholz Bestimmung der Eindringtiefe und der Aufnahme von Kreosot (Teerimprgnierl) inbehandeltem HolzEnglische bersetzung von DIN EN 12490:2010-11Durabilit du bois et des matriaux drivs du bois Bois massif trait avec un produit de prservation Dtermination de la pntration et d

4、e la rtention de crosote dans le bois traitTraduction anglaise de DIN EN 12490:2010-11SupersedesDIN EN 12490:1999-01www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1710.10 DIN EN 12490:2010-11 2 A comma is used as the decimal marke

5、r. National foreword This standard has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the Normenausschuss Holzwirtschaft und Mbel (Timber and Furniture Standards Com

6、mittee), Working Committee NA 042-03-06 AA Spiegelausschuss zu CEN/TC 38 und ISO/TC 165/SC 1 Dauerhaftigkeit von Holz und Holzprodukten. The DIN Standards corresponding to the International Standards referred to in this document are as follows: EN ISO 3696 DIN ISO 3696 ISO 3131 DIN 52182 Amendments

7、This standard differs from DIN EN 12490:1999-01 as follows: a) a new NOTE 5 has been included in Clause 5; b) the standard has been editorially revised. Previous editions DIN EN 12490: 1999-01 National Annex NA (informative) Bibliography DIN 52182, Testing of wood Determination of density DIN ISO 36

8、96, Water for analytical laboratory use Specification and test methods EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12490 June 2010 ICS 71.100.50; 79.040 Supersedes EN 12490:1998English Version Durability of wood and wood-based products - Preservative-treated solid wood - Determination of th

9、e penetration and retention of creosote in treated wood Durabilit du bois et des matriaux drivs du bois - Bois massif trait avec un produit de prservation - Dtermination de la pntration et de la rtention de crosote dans le bois trait Dauerhaftigkeit von Holz und Holzprodukten - Mit Holzschutzmitteln

10、 behandeltes Vollholz - Bestimmung der Eindringtiefe und der Aufnahme von Kreosot (Teerimprgnierl) in behandeltem Holz This European Standard was approved by CEN on 19 May 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this E

11、uropean Standard 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 CEN Management Centre or to any CEN member. This European Standard exists in three official versions (En

12、glish, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgar

13、ia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR S

14、TANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12490:2010: EEN 12490:2010 (E) 2 Contents Page F

15、oreword 31 Scope 42 Normative references 43 Terms and definitions .44 Sampling of creosote-treated wood for the determination of penetration and retention 54.1 General requirements 54.2 Specific requirements for test samples for the determination of penetration 64.3 Specific requirements for test sa

16、mples for the determination of retention 65 Determination of the penetration of creosote in treated wood .66 Determination of the retention of creosote in treated wood .76.1 Reagents .76.2 Apparatus .76.3 Preparation of the water trap and the condenser before the extraction 96.4 Procedure for the ex

17、traction of creosote from the composite sample 96.5 Expression of results . 107 Test report . 10Annex A (informative) Sapwood/heartwood boundary determination 12A.1 Scope . 12A.2 Pines 12A.2.1 Reagents 12A.2.2 Procedure 12A.3 Douglas fir . 13A.3.1 Reagents 13A.3.2 Procedure 13Annex B (normative) Den

18、sity of some selected timber species that are commonly treated with creosote 14Bibliography . 15DIN EN 12490:2010-11 EN 12490:2010 (E) 3 Foreword This document (EN 12490:2010) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products”, the secretariat of which is

19、 held by AFNOR. 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 December 2010, and conflicting national standards shall be withdrawn at the latest by December 2010. Attention is drawn to the possi

20、bility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12490:1998. According to the CEN/CENELEC Internal Regulations, the national standards org

21、anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, P

22、ortugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12490:2010-11 EN 12490:2010 (E) 4 1 Scope This European Standard specifies the reference methods for determining the penetration and retention of creosote in timber freshly treated with creosote, principa

23、lly in order to ascertain whether the treated timber conforms to specifications written in terms of EN 351-1. It also provides guidance on the acquisition of test samples and their handling between sampling and analysis. NOTE In the day-to-day practice at the plant, other methods (e.g. weighing the

24、charge before and after treatment) can be used for determining the retention, provided that a significant relationship can be established with this method. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the

25、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 351-1, Durability of wood and wood-based products Preservative-treated solid wood Part 1: Classification of preservative penetration and retention EN 351-2, Durability

26、 of wood and wood-based products Preservative-treated solid wood Part 2: Guidance on sampling for the analysis of preservative-treated wood EN ISO 3696:1995, Water for analytical laboratory use Specification and test methods (ISO 3696:1987) ISO 3131, Wood Determination of density for physical and me

27、chanical tests 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 analytical zone part of the treated wood which is analysed for assessing compliance with the retention requirement Adapted from EN 1001-2:2005, 4.03 NOTE For definition of “retent

28、ion requirement“, see 3.6. 3.2 batch clearly identifiable collection of units of preservative-treated wood manufactured to conform to the same defined penetration and retention requirements EN 1001-2:2005, 4.04 3.3 charge all the wood treated together in a single operation EN 1001-2:2005, 4.13 DIN E

29、N 12490:2010-11 EN 12490:2010 (E) 5 3.4 composite sample collection of all test samples derived from the sampling units taken from the batch in accordance with the chosen sampling plan for the determination of retention EN 1001-2:2005, 4.15 3.5 penetration requirement minimum depth to which the creo

30、sote is required to penetrate the wood Adapted from EN 1001-2.2005, 4.59 3.6 retention requirement loading of the creosote that is required in the analytical zone Adapted from EN 1001-2:2005, 4.73 NOTE 1 For definition of “analytical zone“ see 3.1. NOTE 2 The retention requirement is expressed in ki

31、lograms of creosote per cubic metre of treated wood. 3.7 sampling unit unit (for example a pole, a sleeper, a board or a fence post) of preservative treated wood taken from a batch or charge of preservative treated wood Adapted from EN 1001-2:2005, 4.75 NOTE For definition of “batch“ see 3.2. For de

32、finition of “charge“ see 3.3. 3.8 test sample portion of preservative treated wood taken from a sampling unit, in accordance with the recommendations of EN 351-2 3.9 transition wood wood in a zone between the true sapwood and the true heartwood Adapted from EN 1001-2:2005, 1.45 NOTE This is distingu

33、ishable only in a very few wood species. In general its treatability is similar to that of heartwood. 4 Sampling of creosote-treated wood for the determination of penetration and retention 4.1 General requirements The acquisition of sampling units and test samples shall follow the procedures establi

34、shed in EN 351-1 and EN 351-2. Additionally, when sampling from a freshly treated batch, the wood shall be allowed to cool to ambient temperature before taking test samples. DIN EN 12490:2010-11 EN 12490:2010 (E) 6 4.2 Specific requirements for test samples for the determination of penetration The p

35、enetration of creosote in each of the test samples shall be determined immediately after sampling, according to Clause 5, in order to avoid creosote migration from the treated to the untreated area. 4.3 Specific requirements for test samples for the determination of retention A batch to be sampled f

36、or the determination of retention shall be sampled at a time less than 30 days after the treatment. NOTE 1 The retention requirements defined by the specifier are only applicable to treated wood as produced, not to the treated wood in service. The composite sample for a batch or charge shall compris

37、e test samples taken in accordance with the chosen sampling plan. Sufficient test sample material shall be taken to ensure that at least 1 g of creosote is contained in the composite sample. NOTE 2 Wood treated with creosote by vacuum/high pressure processes can normally be expected to contain more

38、than 10 % by mass of creosote. Therefore, it will require approximately 10 g to 12 g of creosoted wood to obtain at least 1 g of creosote in the composite sample. NOTE 3 The larger the number of test samples included in the composite sample, the more accurate the resultant retention determination sh

39、ould be. As soon as possible after the test samples have been obtained, and the penetration measured the wood not included in the specified analytical zone of the test samples shall be removed. The remaining wood constitutes the composite sample for the determination of retention. NOTE 4 If the pene

40、tration and retention are determined from the same test samples, the penetration should be determined before any wood is removed from the test samples. The composite sample shall be stored in a stoppered glass bottle to prevent any free creosote being lost before the analysis. 5 Determination of the

41、 penetration of creosote in treated wood For each of the test samples, measure and record the penetration of creosote in the treated wood, as the distance, in millimetres (mm), of the furthest point from the surface to which creosote can be seen to be present in the wood, in accordance with the gene

42、ral recommendations in EN 351-2. NOTE 1 Penetration should be assessed visually from a freshly cut test sample, the colour of the creosote clearly indicating its extent in the treated timber. NOTE 2 In some cases the creosote may not penetrate continuously through the early and late wood of the trea

43、ted timber. NOTE 3 If the boundary between the sapwood and the heartwood cannot be distinguished visually, in some cases a chemical method can be used to distinguish between them. Some examples are given in Annex A. Where no distinction is possible, all the wood is regarded as sapwood. NOTE 4 Occasi

44、onally small zones of sapwood adjacent to the heartwood cannot be treated, for example transition wood. These should be ignored for the purposes of assessing sapwood penetration. NOTE 5 Creosote treated zones can be subsurfaced by migrating creosote during sampling. To fully visualize creosote treat

45、ed zones within taken voluminous drilling cores from sampling units, a final cut through the centre of the core, direction from the untreated to the treated zone and therefore surface, should be made. The inner untreated zone cannot be subsurfaced. DIN EN 12490:2010-11 EN 12490:2010 (E) 7 6 Determin

46、ation of the retention of creosote in treated wood 6.1 Reagents 6.1.1 Water of grade 3, according to EN ISO 3696:1995. 6.1.2 Chromic acid saturated solution in concentrated sulphuric acid. 6.1.3 Toluene, C6H5CH3, analytical grade. 6.1.4 Suitable detergent solution in water. 6.2 Apparatus Ordinary la

47、boratory apparatus and the following (see Figure 1). 6.2.1 Glass round-bottomed flask, capacity 500 ml or 1 000 ml. 6.2.2 Heating mantle for the glass round-bottomed flask (6.2.1). 6.2.3 Glass Soxhlet-apparatus, capacity 60 ml. 6.2.4 Cellulose extraction thimble (28 mm diameter and 80 mm height). 6.

48、2.5 Glass water trap, Dean and Stark type, with a capacity of 10 ml, fitted with a stopcock and marked in graduations of 0,1 ml. 6.2.6 Glass reflux condenser of the “Liebig-West“ type. 6.2.7 Balance with an accuracy of 0,01 g. 6.2.8 Glass rod, or rod made of another inert material, with a diameter o

49、f about 3 mm and as long as the condenser (6.2.6) and the water trap (6.2.5) together. 6.2.9 Vented drying oven, that can be maintained at (115 5) C and operated in a fume cupboard. 6.2.10 Desiccator with a drying agent of the indicating type (e.g. silica gel). DIN EN 12490:2010-11 EN 12490:2010 (E) 8 Key 1 Round bottom flask (6.2.1) 2 Soxhlet-apparatus (6.2.3) and extraction thimble (6.2.4) 3 Adaptor that fits between the Soxhlet (6.2.3) and the water trap (