BS EN 351-2-2007 Durability of wood and wood-based products - Preservative-treated solid wood - Part 2 Guidance on sampling for the nanalysis of preservative-treated wood《木材和木基制品的耐.pdf

1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58s

2、olid wood Part 2: Guidance on sampling for the analysis of preservative-treated woodICS 71.100.50; 79.040Durability of wood and wood-based products Preservative-treated BRITISH STANDARDBS EN 351-2:2007BS EN 351-2:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontroll

3、ed Copy, (c) BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 55479 7Amendments/corrigenda issued since publicationDate CommentsThis publication does not purport to include all the necessary provisions

4、 of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of EN 351-2:2007. It supersedes BS EN 351-2:1996 which is withdrawn.The UK participation

5、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 organizations represented on this committee can be obtained on request to its secretary.EUROPEAN STANDARDNORME EUROPENNEEUROP

6、ISCHE 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 for theanalysis of preservative-treated woodDurabilit du bois et des produits base de bois - Boismassif

7、 trait avec produit de prservation - Partie 2 : Guidedchantillonnage pour lanalyse du bois trait avec unproduit de prservationDauerhaftigkeit von Holz und Holzprodukten - MitHolzschutzmitteln behandeltes Vollholz - Teil 2: Leitfadenzur Probenentnahme fr die Untersuchung des mitHolzschutzmitteln beha

8、ndelten 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliograp

9、hical 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, French, German). A version in any other language made by translationunder the responsibility of a CEN

10、 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, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy

11、, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Bru

12、ssels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 351-2:2007: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIEN 351-2:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normat

13、ive 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 number o

14、f sampling units 13 Bibliography 15 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIEN 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 secre

15、tariat of which is 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 January 2008, and conflicting national standards shall be withdrawn at the latest by January 2008. This document s

16、upersedes EN 351-2:1995. Significant technical differences between this edition and EN 351-2:1995 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

17、the axial penetration. This document consists of two parts. Part 1 is concerned with defining the 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 samp

18、ling for analysis of preservative-treated solid wood. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, Franc

19、e, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (

20、c) BSIEN 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 of wood preservative. This part of EN 351 is applicable for the production of preservative-treated solid

21、 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 may be applied for the subsequent examination of treated wood in service. 2 Normative references The follow

22、ing 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 document (including any amendments) applies. EN 1001-2:2005, Durability of wood and wood-based products

23、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 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1001-2:2005 a

24、nd 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 deterioration NOTE Adapted from EN 1001-2:2005, 4.01. 3.2 analytical zone part of the treated wood that is anal

25、ysed 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 will depend upon the species of wood being analysed and the treatment level concerned. EN 1001-2:2005, 4.03

26、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 all the wood treated together in a single operation EN 1001-2:2005, 4.13 Licensed Copy: Wang Bin, ISO/EXC

27、HANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIEN 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 3.6 i

28、ncising 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 penetrate the

29、 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 for pe

30、netrating 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 preservative-tr

31、eated 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 comprom

32、ise 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 treated

33、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 commoditie

34、s. NOTE 3 A batch should not consist of a mixture of round and sawn wood. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIEN 351-2:2007 (E) 6 5 Selection of sampling units from a batch Sampling units shall be selected to be representative of the ent

35、ire batch being considered. The number of sampling units shall be in accordance with the guidance 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

36、retention could impose special requirements for sampling and subsequent handling which shall 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

37、 a single test sample, only one test sample per sampling unit is necessary. Otherwise, two test 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

38、 and man-made holes or cuts and at least 100 mm away from knots in a longitudinal direction. 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 penetra

39、tion, test samples shall be taken midway between ends or at least 300 mm from the end. Test samples 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 retentio

40、n. NOTE 1 Borings are normally suited for round wood (poles, piles) and thicker dimensions of 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

41、cross-sections. 7 Test samples for determining penetration 7.1 Boring 7.1.1 General Borings shall 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 shal

42、l be rejected and a new one taken. If material is incised, borings shall be taken at a point midway between adjacent incisions. NOTE All borer holes should be promptly plugged with tight fitting wooden plugs pre-treated with an appropriate preservative. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA ST

43、ANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIEN 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 surface. For part-round wood the borer shall be directed towards the pith (or the point where the pith would have

44、 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 borer shall penetrate to a depth greater than the penetration measured (see Figure 1). Key to Figures 1 to 9:

45、 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 requirement is for complete penetration, it is necessary for the borer to penetrate to the geometrical centre of

46、 the cross-section (see Figure 2). Figure 2 Sampling location in round and part-round wood if complete penetration is required Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/04/2008 08:29, Uncontrolled Copy, (c) BSIEN 351-2:2007 (E) 8 7.1.3 Sawn and profiled wood If a defined penetration

47、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 both sap

48、wood 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, borings

49、 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 perpendicular 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