Wood preservatives - Method for natural preconditioning out of ground contact of treated wood specimens prior to biological laboratory test

This CEN Technical Specification specifies a method of natural preconditioning for wood specimens treated with a wood preservative either by penetrating processes or by surface application that can be used in conjunction with existing European Standards on testing of the preventive action of wood preservatives against basidiomycetes and/or insects.

Holzschutzmittel - Verfahren zur natürlichen Vorkonditionierung ohne Erdkontakt für behandelte Holz-Prüfkörper vor biologischer Laborprüfung

Diese Technische Spezifikation des CEN legt ein Verfahren zur natürlichen Vorkonditionierung von
Holzproben fest, die entweder durch Tränken mit einem Holzschutzmittel oder dessen Aufbringen auf die
Oberfläche behandelt wurden, das in Verbindung mit den bestehenden Europäischen Normen zur Prüfung der
vorbeugenden Wirkung von Holzschutzmitteln gegen Basidiomyceten und/oder Insekten verwendet werden kann.

Produits de préservation du bois - Méthode de préconditionnement naturel d'éprouvettes de bois traité, sans contact avec le sol, avant essai biologique en laboratoire

La présente Spécification Technique du CEN présente une méthode de préconditionnement naturel
d'éprouvettes de bois traité à l'aide d'un produit de préservation du bois, soit par des procédés
d'imprégnation, soit par application superficielle. Elle peut être utilisée conjointement avec les normes
européennes existantes qui traitent du contrôle de l'efficacité des produits de préservation du bois contre les
basidiomycètes et/ou les insectes.

Zaščitna sredstva za les - Metoda za naravno pripravo zaščitnega vzorca lesa brez stika s tlemi pred biološkim laboratorijskim preskušanjem

General Information

Status
Published
Publication Date
30-Aug-2006
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
29-Nov-2012
Completion Date
29-Nov-2012

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SLOVENSKI STANDARD
SIST-TS CEN/TS 15397:2006
01-december-2006

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Wood preservatives - Method for natural preconditioning out of ground contact of treated

wood specimens prior to biological laboratory test

Holzschutzmittel - Verfahren zur natürlichen Vorkonditionierung ohne Erdkontakt für

behandelte Holz-Prüfkörper vor biologischer Laborprüfung

Produits de préservation du bois - Méthode de préconditionnement naturel d'éprouvettes

de bois traité, sans contact avec le sol, avant essai biologique en laboratoire
Ta slovenski standard je istoveten z: CEN/TS 15397:2006
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
SIST-TS CEN/TS 15397:2006 en

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

---------------------- Page: 1 ----------------------
TECHNICAL SPECIFICATION
CEN/TS 15397
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
May 2006
ICS 71.100.50
English Version
Wood preservatives - Method for natural preconditioning out of
ground contact of treated wood specimens prior to biological
laboratory test

Produits de préservation du bois - Méthode de Holzschutzmittel - Verfahren zur natürlichen

préconditionnement naturel d'éprouvettes de bois traité, Vorkonditionierung ohne Erdkontakt für behandelte Holz-

sans contact avec le sol, avant essai biologique en Prüfkörper vor biologischer Laborprüfung

laboratoire

This Technical Specification (CEN/TS) was approved by CEN on 11 March 2006 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their

comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available

promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)

until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15397:2006: E

worldwide for CEN national Members.
---------------------- Page: 2 ----------------------
CEN/TS 15397:2006 (E)
Contents Page

Foreword..............................................................................................................................................................3

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

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

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

3 Principle..................................................................................................................................................5

4 Materials .................................................................................................................................................5

5 Apparatus ...............................................................................................................................................5

6 Wood test specimens............................................................................................................................6

7 End-sealing prior to exposure..............................................................................................................9

8 Labelling .................................................................................................................................................9

9 Exposure to natural conditions............................................................................................................9

10 Duration of the natural preconditioning procedure ........................................................................ 12

11 Preparation of test specimens and stakes for biological tests ..................................................... 12

12 Reference in the test report............................................................................................................... 13

Bibliography..................................................................................................................................................... 14

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CEN/TS 15397:2006 (E)
Foreword

This Technical Specification (CEN/TS 15397:2006) has been prepared by Technical Committee CEN/TC 38

“Durability of wood and wood-based products”, the secretariat of which is held by AFNOR.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to announce this CEN Technical Specification: Austria, Belgium, 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.
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CEN/TS 15397:2006 (E)
Introduction

For use of class 3 according to EN ISO 335-1 field tests, like those described in EN 330 and ENV 12037, are

a valuable means of studying the performance of a wood preservative. However, they are questionable as a

basis of approvals of wood preservatives for some reasons:

The abiotic factors of outdoor exposure, such as wind, temperatures, UV radiation and rain can in combination

with biotic factors change or depreciate the applied wood preservative to such an extent as to allow decay. A

low frequency of precipitation and the duration of temperatures below or slightly above the freezing point can,

however, in some areas of Europe hinder the development of fungi and a resulting visible deterioration.

Likewise the effectiveness against wood-boring beetles can also be reduced although infestation of the timber

can not occur because the weather conditions in a particular field will not promote cracking of the timber - a

prerequisite for oviposition of for instance the house longhorn beetle. Furthermore under natural conditions

fungal attack and insect infestation can be quite accidental, leading to remarkable variations and therefore

possible misinterpretations of the test results.

Therefore - in a project supported by the Commission of the European Communities [1] to preclude such

disadvantages - a method was developed and tested with a number of the most commonly used wood

preservatives. In this method the treated wood specimens were exposed without soil contact to the natural

abiotic and biotic ageing factors, the complexity of which cannot - or only incompletely - be simulated with the

available artificial ageing methods EN 73 and EN 84. After defined periods of outdoor exposure, attack of

wood-destroying fungi and/or insects were examined under controlled laboratory conditions according to the

relevant European Standards. The applicability of this principle to a number of typical European climates was

confirmed in a further project also supported by the Commission of the European Communities[2]. With some

amendments to the method used in the projects, this document is based on this principle.

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CEN/TS 15397:2006 (E)
1 Scope

This CEN Technical Specification specifies a method of natural preconditioning for wood specimens treated

with a wood preservative either by penetrating processes or by surface application that can be used in

conjunction with existing European Standards on testing of the preventive action of wood preservatives

against basidiomycetes and/or insects.
2 Normative references
Not applicable
3 Principle

Wood test specimens treated with a wood preservative according to relevant biological test methods are

exposed to natural outdoor conditions in a test field. The test specimens are fixed on a rack facing the

prevailing weather under 45°. If brush treatment, dipping, steeping or double vacuum treatment is

recommended, instead of the test specimens described in the relevant European Standards, end-sealed wood

stakes with a cross section equal to the cross section of the test specimens in the relevant test methods can

be used. After different periods of outdoor exposure the standard test specimens and end-sealed test

specimens derived from the stakes by cutting to a length of 50 mm are exposed to biological laboratory tests

as for instance those described in EN 46-1,EN 46-2, EN 47, EN 113 or ENV 839 respectively.

4 Materials
4.1 End-seal compounds
4.1.1 Preservative resistant end-seal
A material resistant to the penetration of the test preservative solutions.

NOTE Polyvinyl acetate (PVAc) glues have been found to be suitable for many organic solvent formulations. For

water-borne formulations the weatherproof end-seal (4.1.2) may be used.
4.1.2 Weatherproof end-seal

A material which prevents water entry as well as microbial infection and remains effective during long term

exposure to the weather.
NOTE Two coats of an epoxy-resin/pitch compound have been found to be suitable.
5 Apparatus
5.1 Sawing equipment
A sawing machine capable of producing a fine sawn finish.
5.2 Drilling machine and drills
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CEN/TS 15397:2006 (E)

5.3 Conditioning chamber, well ventilated and controlled at (20 ± 2) °C and (65 ± 5) % relative humidity.

5.4 Ventilated drying oven, capable of being maintained at (103 ± 3) °C.
5.5 Desiccators, with efficient desiccant (silica gel for example).

5.6 Equipment, suitable for carrying out the treatment specified by the supplier.

5.7 Balance, capable of weighing to the nearest 0,01 g.

5.8 Safety equipment and protective clothing, appropriate for the test product, to ensure the safety of

the operator.

5.9 System for fixing stakes in the exposure rack: tubular copper rivets, plastic sticks and spiral

springs of stainless steel.
5.10 Labels, inert, long-lasting labels and corrosion resisting fixing pins.

5.11 Exposure racks: Aluminium racks (see Figures 1 and 2) that allow test specimens or stakes to face

the prevailing weather under 45°, approximately 1 m above ground level.
5.12 Ordinary laboratory equipment.
6 Wood test specimens
6.1 Specimens according to the relevant biological test methods
6.1.1 General

The test specimens and their preparation including treatment and post treatment conditioning are defined in

the documents concerning the biological tests to which they are intended to be subjected. The relevant test

standards are those standards where the test specimens have the dimensions 15 mm x 25 mm x 50 mm.

These include EN 46-1,EN 46-2, EN 47, EN 113 or ENV 839.

The natural preconditioning procedure shall be carried out at the end of the conditioning period that follows the

treatment of the specimens described in the relevant biological test standard.
6.1.2 Number of test specimens

The number of test specimens shall allow the relevant biological tests to be carried out in accordance with the

instructions in the appropriate documents, bearing in mind that the natural preconditioning procedure shall be

applied both to treated specimens that are subjected to biological agents and to control test specimens. The

control test specimens are of the following kinds:

- treated test specimens that will not be subjected to attack by biological agents after natural

preconditioning. These will serve as controls for changes in mass in those tests in which this factor is

taken into consideration. One set of control test specimens will be needed for each concentration and

period of exposure;
In most of the European areas this would normally be south-west
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CEN/TS 15397:2006 (E)

- untreated control test specimens which, after natural preconditioning, are subjected to the biological tests

to check any variation in the behaviour of untreated wood. One single set of test specimens shall be

provided for each exposure period;

- control test specimens treated with the solvent or diluent for each period of exposure if necessary.

6.2 Stakes
6.2.1 General

If superficial treatment is recommended by the supplier of the test preservative, stakes can be used as an

alternative. If so, the stakes shall have a cross section of (25 ± 0,5) mm x (15 ± 0,5) mm and an appropriate

length which can be a multiple of (50 ± 0,5) mm (the length of the test specimens in these include EN 46-1,EN

46-2, EN 47, EN 113 or ENV 839).
6.2.2 Species of wood for stakes

The reference species are the species mentioned in the relevant documents for the subsequent biological

laboratory tests.

If no requirements are given, e.g. in the case of intended double vacuum treatment, the reference species are

Scots pine, Pinus sylvestris Linnaeus, and
beech (Fagus sylvatica Linnaeus).
Additional tes
...

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