EN 351-2-2007 en Durability of wood and wood-based products - Preservativetreated solid wood - Part 2 Guidance on sampling for the analysis of preservative-treated wood《木材和木基制品的耐用性.pdf

1、BRITISH STANDARDBS EN 351-2:2007Durability of wood and wood-based products Preservative-treated solid wood Part 2: Guidance on sampling for the analysis of preservative-treated woodICS 71.100.50; 79.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g

2、40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 351-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 55479 7National forewordThis British

3、Standard is the UK implementation of EN 351-2:2007. It supersedes BS EN 351-2:1996 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/515, Wood preservation, to Subcommittee B/515/2, Durability, treatment, performance and environment issues.A list of or

4、ganizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obliga

5、tions.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 351-2July 2007ICS 79.040; 71.100.50 Supersedes EN 351-2:1995 English VersionDurability of wood and wood-based products - Preservative-treated solid wood - Part 2: Guidance on sampling f

6、or theanalysis of preservative-treated woodDurabilit du bois et des produits base de bois - Boismassif trait avec produit de prservation - Partie 2 : Guidedchantillonnage pour lanalyse du bois trait avec unproduit de prservationDauerhaftigkeit von Holz und Holzprodukten - MitHolzschutzmitteln behand

7、eltes Vollholz - Teil 2: Leitfadenzur Probenentnahme fr die Untersuchung des mitHolzschutzmitteln behandelten HolzesThis European Standard was approved by CEN on 21 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro

8、peanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English,

9、 French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cypru

10、s, 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 STANDARDIZATIONCOMIT E

11、UROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 351-2:2007: EEN 351-2:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Nor

12、mative references 4 3 Terms and definitions .4 4 Selection of batch5 5 Selection of sampling units from a batch .6 6 Selection of test samples from a sampling unit .6 7 Test samples for determining penetration6 8 Test samples for determination of retention 10 Annex A (informative) Selection of numbe

13、r of sampling units 13 Bibliography 15 EN 351-2:2007 (E) 3 Foreword This document (EN 351-2:2007) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national

14、 standard, either by publication of an identical text or by endorsement, at the latest by January 2008, and conflicting national standards shall be withdrawn at the latest by January 2008. This document supersedes EN 351-2:1995. Significant technical differences between this edition and EN 351-2:199

15、5 are as follows: a) introduction of terms with their definition in clause 3; b) addition of clause 4 “Selection of batch“; c) deletion of the sub-clause “Longitudinal sections“ for sampling to determine the axial penetration. This document consists of two parts. Part 1 is concerned with defining th

16、e penetration requirements and gives guidance on the retention requirements for preservatives in preservative-treated solid wood. Part 2 gives guidance on the general procedures to be followed in the sampling for analysis of preservative-treated solid wood. According to the CEN/CENELEC Internal Regu

17、lations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Neth

18、erlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 351-2:2007 (E) 4 1 Scope This part of EN 351 provides guidance on the general procedures used in obtaining samples of preservative-treated wood to determine the penetration and retention

19、 of wood preservative. This part of EN 351 is applicable for the production of preservative-treated solid wood, including glued laminated timber, suitable for use in those service conditions defined by the use classes in EN 335-1. However, the sampling guidance provided within this part of EN 351 ma

20、y be applied for the subsequent examination of treated wood in service. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced

21、 document (including any amendments) applies. EN 1001-2:2005, Durability of wood and wood-based products Terminology Part 2: Vocabulary ISO 2859-1:1999, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection 3 Ter

22、ms and definitions For the purposes of this document, the terms and definitions given in EN 1001-2:2005 and the following apply. 3.1 active ingredient(s) individual chemical compound or compounds included in a wood preservative product to give it specific activity against biological agents of deteri

23、oration NOTE Adapted from EN 1001-2:2005, 4.01. 3.2 analytical zone part of the treated wood that is analysed for assessing compliance with the retention requirement (see 3.8) NOTE The analytical zone is taken from the lateral surfaces of the treated wood. The depth to which sampling is required wil

24、l depend upon the species of wood being analysed and the treatment level concerned. EN 1001-2:2005, 4.03 3.3 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 3.4 charge

25、all the wood treated together in a single operation EN 1001-2:2005, 4.13 EN 351-2:2007 (E) 5 3.5 composite sample collection of all test samples derived from the sampling units (3.9) taken from the batch (3.3) in accordance with the chosen sampling plan for determining retention EN 1001-2:2005, 4.15

26、 3.6 incising procedure of puncturing the lateral surfaces of wood as an aid to secure deeper and more uniform penetration of wood preservative EN 1001-2:2005, 4.38 3.7 penetration requirement minimum depth at which the active ingredient(s) (3.1) of the wood preservative is (are) required to penetra

27、te the wood EN 1001-2:2005, 4.59 3.8 retention requirement loading of the wood preservative product that is required in the analytical zone NOTE The retention requirement is expressed in grams of product per square metre for superficial application processes and kilograms of product per cubic metre

28、for penetrating treatment processes. It is derived from the critical value in different ways depending upon the particular test involved. EN 1001-2:2005, 4.73 3.9 sampling unit one unit (for example a pole, a board, a fence post) of preservative-treated wood taken from a batch (see 3.3) of preservat

29、ive-treated wood EN 1001-2:2005, 4.75 4 Selection of batch For the selection of a batch the following shall be considered and deviations reported: Batch shall be selected with respect to the aim of the subsequent sampling and analysis. NOTE 1 In practice the selection of a batch is the result of a c

30、ompromise between the aim of the inspection and the quality of the analysis in terms of technical and financial considerations. Batch shall be selected in such a way that the subsequent selection of sampling units is representative for the batch. Batch may consist of one charge or several charges tr

31、eated on different occasions. NOTE 2 If sampling is to be carried out from the same commodity manufactured at different plants at the same site, the batch should be selected in such a way that commodities from the different plants are represented in the batch. Batch may not consist of different comm

32、odities. NOTE 3 A batch should not consist of a mixture of round and sawn wood. EN 351-2:2007 (E) 6 5 Selection of sampling units from a batch Sampling units shall be selected to be representative of the entire batch being considered. The number of sampling units shall be in accordance with the guid

33、ance in ISO 2859-1. See Annex A for guidance. NOTE If sapwood penetration is to be determined, units consisting entirely of heartwood should be avoided. Individual techniques for determining penetration and retention could impose special requirements for sampling and subsequent handling which shall

34、be reported. 6 Selection of test samples from a sampling unit Test samples shall be selected from the sampling units according to the following principles: If penetration and retention can be determined from a single test sample, only one test sample per sampling unit is necessary. Otherwise, two te

35、st samples shall be taken per sampling unit for the separate determination of penetration and retention. Test samples shall be taken from clear, straight-grained wood, away from splits, checks, other defects and man-made holes or cuts and at least 100 mm away from knots in a longitudinal direction.

36、For assessment of retention and lateral penetration, test samples shall be taken midway between ends or at least 100 mm from knots in a longitudinal direction. For assessment of retention and lateral penetration, test samples shall be taken midway between ends or at least 300 mm from the end. Test s

37、amples shall be taken as borings, cross-sections, or thin sections (see Clause 7 and Clause 8) as appropriate with respect to the commodities sampled and the methods to determine the penetration and retention. NOTE 1 Borings are normally suited for round wood (poles, piles) and thicker dimensions of

38、 sawn wood (railway sleepers). NOTE 2 To determine the preservative retention, cross-sections will form a more reliable basis than borings, as the whole analytical zone will be available for examination for cross-sections. 7 Test samples for determining penetration 7.1 Boring 7.1.1 General Borings s

39、hall not be used to determine axial penetration. Borings shall be taken with a sharp increment borer which extracts a core of minimum diameter of 5 mm. If any part of the sample is lost the whole sample shall be rejected and a new one taken. If material is incised, borings shall be taken at a point

40、midway between adjacent incisions. NOTE All borer holes should be promptly plugged with tight fitting wooden plugs pre-treated with an appropriate preservative. EN 351-2:2007 (E) 7 7.1.2 Round and part-round wood For round wood the borer shall be directed towards the pith from any point on the surfa

41、ce. For part-round wood the borer shall be directed towards the pith (or the point where the pith would have been in the original log) from a point on the curved surface which is furthest away from the cut surface(s). If a defined penetration depth, less than complete penetration, is required, the b

42、orer shall penetrate to a depth greater than the penetration measured (see Figure 1). Key to Figures 1 to 9: Penetration of preservative Wood taken as sample Heartwood No treatment required Figure 1 Sampling location in round and part-round wood if a defined penetration depth is required If the requ

43、irement is for complete penetration, it is necessary for the borer to penetrate to the geometrical centre of the cross-section (see Figure 2). Figure 2 Sampling location in round and part-round wood if complete penetration is required EN 351-2:2007 (E) 8 7.1.3 Sawn and profiled wood If a defined pen

44、etration depth, less than full sapwood penetration is required, borings shall be taken as far as possible, equidistant from the sides and perpendicular to the face being sampled to a depth greater than the penetration being measured (see Figure 3). Figure 3a - Sampling location in samples containing

45、 both sapwood and heartwood Figure 3b - Sampling location in samples consisting entirely of sapwood or if it is impossible to identify any heartwood before sampling Figure 3 Sampling location in sawn and profiled wood if a defined penetration depth is required If full sapwood penetration is required

46、, borings shall be taken, as far as possible, in the radial direction and where the depth of sapwood is greatest. From sampling units consisting entirely of sapwood or if it is impossible to identify any heartwood before sampling, the boring shall be taken equidistant from the sides and perpendicula

47、r to the face being sampled to a depth of half the thickness of the sampling unit (see Figure 4). Figure 4a - Sampling location in samples containing both sapwood and heartwood Figure 4b - Sampling location in samples consisting entirely of sapwood or if it is impossible to identify any heartwood be

48、fore sampling EN 351-2:2007 (E) 9 Figure 4c - Sampling locations in samples containing both sapwood and heartwood and where a defined penetration depth is required in the heartwood Figure 4 Sampling locations in sawn and profiled wood if full sapwood penetration is required 7.2 Cross-sections To det

49、ermine lateral penetration a complete cross-section test sample shall be obtained from the sampling unit by making two saw cuts completely through the test sample beyond the extent of axial penetration 10 mm apart and perpendicular to the lateral surfaces of the wood. To determine the axial penetration two saw cuts shall similarly be made, the first at a distance from the end grain equal to the penetration requirement and the second 10 mm in excess of this (see Figure 5). If the ends of sampling units have been cut to accomm