Durability of wood and wood-based products - Interpretation document for standards related to efficacy requirements and specifications of wood preservatives

This document is intended to facilitate the interpretation and use of the European Standards where the testing and specification of wood preservative products are described. It aims to assist users (manufacturers, specifiers, authorities, etc.) to correlate the choice of selected test methods, wood substrates and biological agents with the efficacy requirements of wood preservatives based on their claimed target organisms and end use. This document is a source of supplementary information to the relevant standards and cannot be used as a standalone document.

Dauerhaftigkeit von Holz und Holzprodukten - Anwendungsdokument für Normen zu Anforderungen an die Wirksamkeit und Eigenschaften von Holzschutzmitteln

Durabilité du bois et des produits dérivés - Document d'interprétation des normes relatives aux exigences d'efficacité et aux spécifications des produits de préservation du bois

Trajnost lesa in lesnih izdelkov - Razlagalni dokument za standarde, ki so povezani z zahtevami glede učinkovitosti in s specifikacijami sredstev za zaščito lesa

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Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
06-Apr-2022
Completion Date
06-Apr-2022

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SLOVENSKI STANDARD
kSIST-TP FprCEN/TR 17810:2022
01-februar-2022
Trajnost lesa in lesnih izdelkov - Razlagalni dokument za standarde, ki so

povezani z zahtevami glede učinkovitosti in s specifikacijami sredstev za zaščito

lesa

Durability of wood and wood-based products - Interpretation document for standards

related to efficacy requirements and specifications of wood preservatives
Dauerhaftigkeit von Holz und Holzprodukten - Anwendungsdokument für Normen zu
Anforderungen an die Wirksamkeit und Eigenschaften von Holzschutzmitteln

Durabilité du bois et des produits dérivés - Document d'interprétation des normes

relatives aux exigences d'efficacité et aux spécifications des produits de préservation du

bois
Ta slovenski standard je istoveten z: FprCEN/TR 17810
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
79.020 Postopki v tehnologiji lesa Wood technology processes
kSIST-TP FprCEN/TR 17810:2022 en,fr,de

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

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kSIST-TP FprCEN/TR 17810:2022
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kSIST-TP FprCEN/TR 17810:2022
FINAL DRAFT
TECHNICAL REPORT
FprCEN/TR 17810
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
November 2021
ICS 79.060.01; 79.080
English Version
Durability of wood and wood-based products -
Interpretation document for standards related to efficacy
requirements and specifications of wood preservatives

Durabilité du bois et des produits dérivés - Document Dauerhaftigkeit von Holz und Holzprodukten -

d'interprétation des normes relatives aux exigences Anwendungsdokument für Normen zu Anforderungen

d'efficacité et aux spécifications des produits de an die Wirksamkeit und Eigenschaften von

préservation du bois Holzschutzmitteln

This draft Technical Report is submitted to CEN members for Vote. It has been drawn up by the Technical Committee CEN/TC 38.

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 Technical Report. It is distributed for review and comments. It is subject to change without

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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TR 17810:2021 E

worldwide for CEN national Members.
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FprCEN/TR 17810:2021 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 General principles ........................................................................................................................................... 5

5 Selection of wood substrates for the products under test ............................................................... 5

5.1 Testing against decay fungi ......................................................................................................................... 5

5.2 Testing against termites ............................................................................................................................... 6

5.3 Testing against beetle larvae ...................................................................................................................... 6

5.4 Testing against marine borers ................................................................................................................... 6

6 Treating the test specimens with the product under test ................................................................ 6

7 Artificial ageing of treated wood ............................................................................................................... 7

8 Wood attacking organisms .......................................................................................................................... 7

8.1 General ................................................................................................................................................................ 7

8.2 Fungi .................................................................................................................................................................... 7

8.2.1 General ................................................................................................................................................................ 7

8.2.2 Basidiomycetes ................................................................................................................................................ 8

8.2.3 Soft rot ................................................................................................................................................................. 8

8.2.4 Blue-stain fungi ................................................................................................................................................ 8

8.2.5 Sapstain and mould fungi ............................................................................................................................. 8

8.3 Insects ................................................................................................................................................................. 8

8.3.1 Coleoptera .......................................................................................................................................................... 8

8.3.2 Termites ............................................................................................................................................................. 9

9 Use of CEN standards .................................................................................................................................. 10

9.1 Preventative wood preservatives .......................................................................................................... 10

9.2 Curative wood preservatives ................................................................................................................... 11

9.3 Validity of test results from former standards after their revision ........................................... 11

Annex A (informative) Decision-making schemes for the choice of the test ........................................ 12

A.1 General ............................................................................................................................................................. 12

A.2 Testing the efficacy of preventative products against basidiomycetes fungi ........................ 12

A.3 Testing the efficacy of preventative products against wood-boring beetles .......................... 13

A.4 Testing the efficacy of curative products against wood boring beetles ................................... 14

A.5 Testing the efficacy of wood preservatives against subterranean termites ........................... 15

Bibliography ................................................................................................................................................................. 16

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FprCEN/TR 17810:2021 (E)
European foreword

This document (FprCEN/TR 17810:2021) 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 Vote on TR.
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FprCEN/TR 17810:2021 (E)
Introduction

CEN standards are regarded as the preferred reference for the assessment of the efficacy of wood

preservatives for the authorization of biocidal products in the European market, in compliance with the

Biocidal Products Regulation (528/2012).

Efficacy requirements are specified in EN 599-1 (preventive action) and EN 14128 (curative action).

This document aims to provide information on the technical and scientific background of the test

methods listed in the CEN standards, in particular those published by CEN/TC 38, as well as to outline

the tools available to support efficacy claims for wood preservatives.
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FprCEN/TR 17810:2021 (E)
1 Scope

This document is intended to facilitate the interpretation and use of the European Standards where the

testing and specification of wood preservative products are described. It aims to assist users

(manufacturers, specifiers, authorities, etc.) to correlate the choice of selected test methods, wood

substrates and biological agents with the efficacy requirements of wood preservatives based on their

claimed target organisms and end use. This document is a source of supplementary information to the

relevant standards and cannot be used as a standalone document.
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 599-1, Durability of wood and wood-based products - Efficacy of preventive wood preservatives as

determined by biological tests - Part 1: Specification according to use class
EN 1001 (all parts), Durability of wood and wood-based products - Terminology

EN 14128, Durability of wood and wood-based products - Efficacy criteria for curative wood preservatives

as determined by biological tests
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 599-1, EN 1001 (all parts) and

EN 14128 apply.

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

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 General principles

The test methods and efficacy criteria discussed in this document characterize the ability of a

preservative to protect wood from attacking organisms. The techniques adopted in each of the test

methods are not intended to reproduce any particular industrial wood treatment, but to obtain

satisfactory penetration and distribution of the preservative in the test specimens. It should also be

emphasized that the test conditions are the most favourable for wood decay and, in the case of laboratory

tests, the decay organisms used were selected as representative of a wider variety of organisms that can

affect the wood in use. In general, the test methods make it possible to determine the preventive or the

curative action of a preservative against wood destroying organisms, e.g. insects, fungi and marine borers.

In the case of preventive treatments, the test requirements for a preservative are specified in EN 599-1

and depend on the use class as defined in EN 335. In the case of curative treatments, the test requirements

for a preservative are specified in EN 14128.
5 Selection of wood substrates for the products under test
5.1 Testing against decay fungi

For testing against brown rot fungi, pine sapwood is used because this is a suitable representative for all

wood species, both softwood and hardwood. Brown rots are not tested on hardwoods because of their

lower virulence on these types of woods.
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FprCEN/TR 17810:2021 (E)

However, since a product can be less effective in hardwoods than in softwoods against white rot or soft

rot fungi and if efficacy in hardwoods is specifically required, data from tests on hardwoods, of which

beech is a suitable representative, are necessary.
5.2 Testing against termites

For testing against European termites, pine sapwood is used because this is a suitable representative for

all wood species, both softwood and hardwood.

For termites of tropical species the choice of the wood substrate depends on the feeding habits of the

individual species.
5.3 Testing against beetle larvae

Test standards for beetle larvae specify wood species based on the feeding preferences of the relevant

beetle species. For example, pine sapwood is used for Hylotrupes bajulus and oak sapwood is used for

Lyctus brunneus. The wood species specified in the test standard is then representative of all wood

species to which that beetle can cause damage.
5.4 Testing against marine borers

For testing against marine borers, pine sapwood is used because this is a suitable representative for all

wood species, both softwood and hardwood. When a specific claim for hardwood is made, hardwood

species of local importance should be used.
6 Treating the test specimens with the product under test

Wood preservatives can be applied in practice by penetrating treatment (e.g. diffusion treatment, double

vacuum process, vacuum/pressure process), by superficial application (e.g. brush and spray techniques,

dipping, also combined with injection). Depending on the intended application process of the product in

practice, whether penetrating, superficial, or both, the corresponding application process specified in the

relevant test method will be used, even though this may not correspond precisely with the process

intended for the test product in practice. The techniques adopted in each of the test methods are intended

to obtain satisfactory penetration and distribution of the preservative in the test specimens.

NOTE 1 The BRV for curative products used by injection is derived from superficial treatments, since there are

no standard methods using injection currently available.

Tests for penetrating processes commonly require a range of preservative retentions to be tested. The

intention is to deliver a result in terms of the “toxic values” of the wood preservative, i.e. the lowest

concentration or retention used in the test at which the wood is adequately protected and the next

concentration or retention below this, at which the wood is not adequately protected. The range of

retentions is achieved by diluting the wood preservative in water or an appropriate solvent.

When testing ready to use products at one single retention level, dilution may be necessary to achieve the

required retention of the wood preservative in the penetration process, while ensuring that the

application rate recommended by the manufacturer is not exceeded.

NOTE 2 EN 113-1 tests the efficacy against basidiomycete fungi of a wood preservative impregnated into wood

blocks using a pressure process. However, the brv derived from this test can be used to determine the efficacy of a

preservative intended for application by a superficial process. In this case, as described in EN 599-1, the brv

2 3

expressed in g/m for superficial application can be calculated multiplying by 2 the brv expressed in kg/m derived

from the EN 113-1 test. The calculation is based on the assumption that superficially applied preservatives

penetrate on average 2 mm into the wood, though evidence of penetration is not required for these products.

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7 Artificial ageing of treated wood

Artificial ageing procedures, which can be carried out in the laboratory, have been designed to account

for the most relevant factors responsible for the loss of activity of treatments, i.e. evaporation (EN 73)

and leaching (EN 84). When both ageing procedures are required, two sets of samples are to be prepared,

each one being subjected to one ageing procedure before testing. The small dimensions of the test

specimens lead to considerable acceleration of the ageing process. The effect of artificial ageing cannot

be directly correlated to a certain time of use, mainly due to the multiple and varying environmental

factors which affect wood performance in service.

Artificial weathering cycles using UV light exposure are an alternative option to natural weathering in the

blue-stain test EN 152.

Ageing tests are not required when testing the curative efficacy of products, as the product is designed to

eradicate an existing infection and not to provide protection over extended periods of time.

8 Wood attacking organisms
8.1 General

Since there can be no question of testing the efficacy of wood preservatives against all the biological

agents liable to attack wood in service, several factors were taken into account in the selection of the most

suitable organisms to act as representatives to cover all wood attacking organisms that may be

encountered:

— the economic importance of the damage done by these organisms to wood in service, their frequency

and geographical distribution;
— the extent to which they represent a type of deterioration;
— their suitability to be cultivated/reared under laboratory conditions;
— the amount of damage that they are able to cause in a relatively short time;

— the confidence that can be placed in the test results, justified by past experience, especially with

regard to reproducibility of results.
8.2 Fungi
8.2.1 General

The fungi included represent the major types of rot that are liable to destroy wood in service and the

blue-stain fungi wich cause discoloration to the wood surface. Account is also taken of the specificity of

these organisms for softwoods or hardwoods or, alternatively, their broad spectrum of action. In addition

to the above factors, the choice of decay fungi in the test standards is also influenced by their tolerance

to certain categories of fungicide.

The definition of the fungi used as test organisms has not been limited to the designation of the species,

but also involves specifying the strain to be used. The virulence of the attacks and their sensitivity to the

fungicides varies not only from one species to another but also from one strain to another. Regular checks

are therefore made, to ensure that the organism retains its capacity for destructive action against the

wood. A virulence control is usually part of the test set-up.

The obligatory use of these strains to characterize a product may be complemented by using additional

optional fungi if these are of particular interest for a geographical region or for a particular envisaged end

use. ln these cases, it is necessary to be assured of the performance of the chosen species and strains

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