Durability of wood and wood-based products - Preservative-treated solid wood - Part 2: Guidance on sampling for the analysis of preservative-treated wood

This part of EN 351 gives guidance for the general procedures to be used in obtaining samples of preservative-treated wood for the determination of penetration and retention of wood preservative. It also gives guidance on the measurement of penetration and retention of a wood preservative in the treated wood.
This part of EN 351 is applicable to the production of preservative-treated solid wood, including glued laminated timber, suitable for use in those service conditions defined within the use classes in EN 335.
NOTE   Glued laminated timber is not suitable for use in fresh or sea water.
This part of EN 351 is not applicable to preservative-treated wood in service. However, the sampling guidance provided within this part of EN 351 can be applied for the subsequent examination of treated wood in service.
Annex A (informative) provides a selection of number of sample units.
Annex B (informative) provides examples of retention measurements.

Dauerhaftigkeit von Holz und Holzprodukten - Mit Holzschutzmitteln behandeltes Vollholz - Teil 2: Leitfaden zur Probenahme für die Analyse des mit Holzschutzmitteln behandelten Holzes

Dieser Teil von EN 351 enthält einen Leitfaden der allgemein anzuwendenden Arbeitsweisen bei der Herstellung von Proben aus mit Holzschutzmitteln behandeltem Holz zur Bestimmung der Eindringtiefe und Aufnahme des Holzschutzmittels. Er gibt außerdem eine Anleitung zur Bestimmung der Eindringtiefe und Aufnahme eines Holzschutzmittels in behandeltem Holz.
Dieser Teil von EN 351 ist anwendbar bei der Herstellung von mit Holzschutzmitteln behandeltem Vollholz, einschließlich Brettschichtholz, das geeignet ist für den Einsatz in bestimmten Anwendungsbereichen, die durch die Gebrauchsklassen nach EN 335 definiert sind.
ANMERKUNG   Brettschichtholz ist nicht für die Verwendung in Süß- oder Meerwasser geeignet.
Dieser Teil von EN 351 ist nicht anwendbar für mit Holzschutzmitteln behandeltes Holz im Gebrauch. Der in diesem Teil von EN 351 vorgelegte Leitfaden zur Probenahme kann jedoch auch auf nachfolgende Untersuchungen des im Gebrauch befindlichen behandelten Holzes angewendet werden.
Anhang A (informativ) enthält eine Auswahl des Stichprobenumfanges.
Anhang B (informativ) enthält Beispiele zur Bestimmung der Schutzmittelaufnahme.

Durabilité du bois et des matériaux dérivés du bois - Bois massif traité avec produit de préservation - Partie 2 : Guide d'échantillonnage pour l'analyse du bois traité avec un produit de préservation

La présente partie de l’EN 351 donne des recommandations relatives aux modes opératoires généraux d’échantillonnage du bois traité avec produit de préservation en vue de déterminer la pénétration et la rétention du produit de préservation du bois. Elle donne également des recommandations sur la façon de mesurer la pénétration et la rétention d'un produit de préservation du bois dans le bois traité.
La présente partie de l'EN 351 s'applique à la production de bois massif traité, y compris le bois lamellé-collé, utilisable dans les conditions de service définies par les classes d’emploi de l'EN 335.
La présente partie de l'EN 351 ne s'applique pas au bois en service traité avec un produit de préservation. Cependant, les recommandations d’échantillonnage données dans la présente partie de l’EN 351 peuvent s’appliquer aux examens ultérieurs du bois traité déjà mis en oeuvre.
L'Annexe A (informative) propose une sélection de plans d'échantillonnage en fonction du nombre d'unités à prélever.
L'Annexe B (informative) fournit des exemples de mesures de rétention.

Trajnost lesa in lesnih proizvodov - Les zaščiten z biocidnimi proizvodi - 2. del: Navodilo za vzorčenje zaščitenega lesa za analizo

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5060 - Closure of Vote - Formal Approval

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SLOVENSKI STANDARD
oSIST prEN 351-2:2020
01-september-2020
Trajnost lesa in lesnih proizvodov - Naravna trajnost masivnega lesa - 2. del:
Navodilo za vzorčenje zaščitenega lesa za analizo

Durability of wood and wood-based products - Preservative-treated solid wood - Part 2:

Guidance on sampling for the analysis of preservative-treated wood
Dauerhaftigkeit von Holz und Holzprodukten - Mit Holzschutzmitteln behandeltes
Vollholz - Teil 2: Leitfaden zur Probenahme für die Untersuchung des mit
Holzschutzmitteln behandelten Holzes

Durabilité du bois et des matériaux dérivés du bois - Bois massif traité avec produit de

préservation - Partie 2 : Guide d'échantillonnage pour l'analyse du bois traité avec un

produit de préservation
Ta slovenski standard je istoveten z: prEN 351-2
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
oSIST prEN 351-2:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 351-2:2020
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oSIST prEN 351-2:2020
DRAFT
EUROPEAN STANDARD
prEN 351-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2020
ICS 79.040; 71.100.50 Will supersede EN 351-2:2007
English Version
Durability of wood and wood-based products -
Preservative-treated solid wood - Part 2: Guidance on
sampling for the analysis of preservative-treated wood

Durabilité du bois et des matériaux dérivés du bois - Dauerhaftigkeit von Holz und Holzprodukten - Mit

Bois massif traité avec produit de préservation - Partie Holzschutzmitteln behandeltes Vollholz - Teil 2:

2 : Guide d'échantillonnage pour l'analyse du bois Leitfaden zur Probenahme für die Untersuchung des

traité avec un produit de préservation mit Holzschutzmitteln behandelten Holzes

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 38.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, 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-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 351-2:2020 E

worldwide for CEN national Members.
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oSIST prEN 351-2:2020
prEN 351-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

4 Selection of batch ............................................................................................................................................ 6

5 Selection of sampling units from a batch ................................................................................................ 6

6 Selection of test samples from a sampling unit .................................................................................... 6

7 Test methods .................................................................................................................................................... 7

7.1 General ................................................................................................................................................................ 7

7.2 Borings ................................................................................................................................................................ 7

7.2.1 General ................................................................................................................................................................ 7

7.2.2 Round and part-round wood....................................................................................................................... 7

7.2.3 Sawn and profiled wood ............................................................................................................................... 8

7.3 Cross-sections ................................................................................................................................................ 10

7.4 Measurement of the penetration ............................................................................................................ 11

8 Test samples for determination of retention ..................................................................................... 11

8.1 General ............................................................................................................................................................. 11

8.2 Thin sections .................................................................................................................................................. 12

8.3 Borings ............................................................................................................................................................. 12

8.4 Cross-sections ................................................................................................................................................ 12

8.5 Measurement of retention ........................................................................................................................ 14

Annex A (informative) Selection of number of sampling units ................................................................... 15

Annex B (informative) Examples of retention measurements ................................................................... 18

B.1 General ............................................................................................................................................................. 18

B.2 Examples ......................................................................................................................................................... 18

B.2.1 Example 1. Sampling and analysis of preservative-treated sawn timber................................ 18

B.2.2 Example 2. Sampling and analysis of preservative-treated joinery – analysis of

individual samples ....................................................................................................................................... 19

Bibliography ................................................................................................................................................................. 20

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oSIST prEN 351-2:2020
prEN 351-2:2020 (E)
European foreword

This document (prEN 351-2:2020) 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 document is currently submitted to the CEN Enquiry.

This document has been prepared under a standardization request given to CEN by the European

Commission and the European Free Trade Association.
This document will supersede EN 351-2:2007.

Significant technical differences between this edition and EN 351-2:2007 are as follows:

— the sampling procedure for determination of longitudinal penetration has been deleted;

— a new clause on retention measurements has been introduced;
— the sampling plans in Annex A have been updated;
— a new annex showing examples on retention measurements has been introduced.

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 sampling and analysis of preservative-

treated solid wood.
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oSIST prEN 351-2:2020
prEN 351-2:2020 (E)
1 Scope

This part of EN 351 gives guidance on the general procedures to be used in obtaining samples of

preservative-treated wood for the determination of penetration and retention of wood preservative. It

also gives guidance on how to measure the penetration and retention of a wood preservative in the

treated wood.

This part of EN 351 is applicable to 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.

This part of EN 351 is not applicable to preservative-treated wood in service. However, the sampling

guidance provided within this part of EN 351 may be applied for the subsequent examination of treated

wood in service.
Annex A (informative) provide a selection of number of sampling units.
Annex B (informative) provides examples of retention measurements.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 — Terminology — Part 2: Vocabulary

EN 12490, Durability of wood and wood-based products — Preservative-treated solid wood —

Determination of the penetration and retention of creosote in treated wood

ISO 2859-1, 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 and the following

apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
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 1 to entry: Adapted from EN 1001–2:2005, 4.01.
3.2
analytical zone

that part of the treated wood which is analysed for assessing compliance with the retention requirement

(see 3.8)
[Source: EN 1001-2:2005, 4.03]
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oSIST prEN 351-2:2020
prEN 351-2:2020 (E)

Note 1 to entry: 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.

3.3
batch

clearly identifiable collection of units of preservative-treated wood manufactured to conform to the same

defined penetration and retention requirements
[Source: EN 1001-2:2005, 4.04]
3.4
charge
all the wood treated together in a single operation
[Source: EN 1001-2:2005, 4.13]
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 the determination of retention
[Source: EN 1001-2:2005, 4.15]
3.6
incising

procedure of puncturing the lateral surfaces of wood as an aid in securing deeper and more uniform

penetration of wood preservative
[Source: EN 1001-2:2005, 4.38]
3.7
penetration requirement

minimum depth to which the active ingredient(s) (3.1) of the wood preservative is (are) required to

penetrate the wood
[Source: EN 1001-2:2005, 4.59]
3.8
retention requirement
loading of the wood preservative product that is required in the analytical zone
[Source: EN 1001-2:2005, 4.73]

Note 1 to entry: The retention requirement is expressed in grams of product per square metre for superficial

application processes and kilograms of product per cubic metre for penetrating treatment processes. It is derived

from the critical value in different ways depending upon the particular test involved.

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-treated wood
[Source: EN 1001-2:2005, 4.75]
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oSIST prEN 351-2:2020
prEN 351-2:2020 (E)
4 Selection of batch
For the selection of batch the following shall be considered:

— The 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 compromise between the aim of the inspection and

the quality of the analysis in terms of technical and financial considerations.

— The batch shall be selected in such a way that the subsequent selection of sampling units is

representative for the batch;

— A batch may consist of one charge or several charges treated on different occasions;

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,

treated according to the same specification, are represented in the batch.

NOTE 2 For continuous processes, e.g. treating wood components in a spray tunnel, a batch can be defined by

the number of components treated during a defined period.
— A batch may not consist of different commodities;
A batch may not consist of a mixture of round and sawn wood.

— The way the batch has been selected shall be described in the report from the sampling and analysis

of the preservative-treated wood.

NOTE 3 E.g. a batch can be identified by wood treated during a certain time period or by charge numbers.

5 Selection of sampling units from a batch

Sampling units shall be selected to be representative of the entire batch being considered. In order to be

representative, sampling units shall be selected to take account the sources of variation that occur in the

batch.

This can include variation in cross-section in treated components and their relative proportions in the

batch. Selection should also take into account the number of packages of treated wood that make up the

batch, where relevant.

The number of sampling units shall be in accordance with the guidance in ISO 2859-1. See Annex A for

guidance.

If sapwood penetration is to be determined, units consisting entirely of heartwood should be avoided.

A true random sampling is difficult to achieve, but it should be as random as reasonably practical; see

also Clause 4, NOTE 1.

Individual techniques for the determination of penetration and 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 a single test sample, only one test sample per

sampling unit is necessary. Otherwise two test samples shall be taken persampling unit for the

separate determination of penetration and retention;
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oSIST prEN 351-2:2020
prEN 351-2:2020 (E)

— For assessment of retention and lateral penetration, test samples shall be taken from clear, straight-

grained wood, away from splits, checks or other defects and at least 100 mm away from knots,

midway between ends or at least 300 mm from the end;

NOTE 1 For superficial treatments, the requirement on sampling > 300 mm from the end does not apply when

determining the retention unless an erroneous value can be expected owing to end grain penetration.

— Test samples shall be taken as borings, cross-sections, or thin sections (see Clauses 7 and 8) as

appropriate with respect to the commodities to be sampled and the methods to determine the

penetration and retention;

— When sampling, it is particularly important that the wood preservative fixation process (for that type

of preservatives) is completed.

Guidance on the fixation should be found in wood preservative manufacturers’ data sheets.

NOTE 2 Borings are normally suited for round wood (poles, piles) and thicker dimensions of sawn wood (railway

sleepers).

NOTE 3 For determination of 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.

— When sampling is carried out by borings, there is a need for a certain minimum mass for

determination of the retention. Therefore, more than one boring taken adjacent to each other may

have to be sampled. The same number of borings shall then be taken from all sampling units involved.

7 Test methods
7.1 General

For determining the penetration of preservative in a batch, test samples are sampled in accordance with

a sampling plan in Annex A.

The penetration of wood preservative shall be determined for each sampling unit sampled from the batch.

Sampling of creosote-treated wood shall be carried out according to EN 12490.
7.2 Borings
7.2.1 General

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 midway between adjacent incisions.

When borings are taken from
...

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