CEN/TS 15397:2006
(Main)Wood preservatives - Method for natural preconditioning out of ground contact of treated wood specimens prior to biological laboratory test
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
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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.
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
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.
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.
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
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
- 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 tests can be undertaken using other species but, if so, this shall be stated in the test report.
6.2.3 Quality of wood
The wood shall be free from visible cracks, stain, decay, insect damage and other defects. The wood shall not
have been water-stored, floated, chemically treated or steamed. The wood shall originate from trees
preferably felled in winter.
NOTE Wood that has been kiln dried at temperatures below 60 °C may be used.
The Scots pine shall be exclusively sapwood containing little resin and having between 2,5 and 8 annual rings
per 10 mm. The proportion of latewood in the annual rings shall not exceed 30 % of the whole.
The beech shall be even-grained, free from tyloses and discoloration. It shall have between two and six
annual rings per 10 mm. Use only sound sapwood, straight-grained and without knots.
6.2.4 Provision of stakes
Prepare planed strips having a cross-section of (25 ±
...
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