CEN/TS 12037:2003

SLOVENSKI STANDARD
01-julij-2005
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SIST-TS ENV 12037:2004
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Wood preservatives - Field test method for determining the relative protective
effectiveness of a wood preservative exposed out of ground contact - Horizontal lap-joint
method
Holzschutzmittel - Freilandversuche zur Bestimmung der relativen Schutzwirkung eines
Holzschutzmittels ohne Erdkontakt - Verfahren mit horizontaler Überplattung (Lap-joint)
Produits de préservation du bois - Essais de champ pour déterminer l'efficacité
protectrice d'un produit de préservation du bois hors de contact avec le sol - Méthode
avec un assemblage a joint superposé
Ta slovenski standard je istoveten z: CEN/TS 12037:2003
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 12037
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
December 2003
ICS 71.100.50 Superscedes ENV 12037:1996
English version
Wood preservatives – Field test method for determining the
relative protective effectiveness of a wood preservative exposed
out of ground contact – Horizontal lap-joint method
Produits de préservation du bois – Essais de champ pour Holzschutzmittel – Freilandversuche zur Bestimmung der
déterminer l’efficacité protectrice d’un produit de relativen Wirksamkeit eines Holzschutzmittels ohne
préservation du bois hors de contact avec le sol – Méthode Erdkontakt – Verfahren mit horizontaler Überlappung (Lap-
avec un assemblage à joint superposé joint)
This Technical Specification (CEN/TS) was approved by CEN on 8 October 2003 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. 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, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, 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
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 12037:2003 E
worldwide for CEN national Members.

Page
Contents
1 Scope .5
2 Normative reference.5
3 Definitions, symbols and abbreviations.5
4 Principle.6
5 Materials .7
6 Apparatus and equipment .9
7 Sample of preservative .11
8 Test lap-joints .11
9 Untreated control lap-joints.13
10 Exposure test site.13
11 Inspections.13
12 Assessment.13
13 Duration of the test.14
14 Validity of test .14
15 Test report .15
Annex A (informative) Information on an additional test with a reference preservative and
on treatment processes .17
Annex B (informative) Example of a test report.21
Annex C (informative) Determination of the preventive efficacy of a test preservative or
components of a test preservative against staining fungi using horizontal lap-joint
method.27
Annex D (informative) Test field site .29
Bibliography.30
Foreword
This document (CEN/TS 12037:2003) 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 supersedes ENV 12037:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary Iceland, Ireland, Italy, Luxembourg,
Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
The main objective of the method is to evaluate the relative effectiveness of the preservative, applied
to jointed specimens of Scots pine sapwood by a treatment method relevant to its intended practical
use and as such does not necessarily accelerate decay but reflects probable performance in service.
The method is concerned with the protection against decay after exposure to a wide range of micro-
organisms occurring out of ground contact under natural conditions. It takes into account also physico-
chemical effects of weathering on the performance of the preservative treated wood.
Since the lap-joints are exposed to natural outdoor conditions during the test period, variations in test
conditions from one exposure site to another have to be expected. Differences in climate, especially
rainfall, will inevitably influence the general rate of development of decay fungi. However, by
comparing the results obtained for the test preservative with those obtained for untreated control lap-
joints, the relative protective effectiveness of the preservative under test can be evaluated.
NOTE The procedures described in this Technical Specification are intended to be carried out by suitably
trained and/or supervised specialists. Appropriate safety precautions should be observed throughout the use of
the Technical Specification.
1 Scope
This Technical Specification describes a method of test for wood preservatives that are intended for
use in wood to be exposed to the weather out of contact with the ground without the additional
protection of a surface coating.
The method is applicable to the testing of commercial or experimental preservatives applied by
techniques appropriate to commercial practice. The method is applicable to chemical products used
individually or in combination to prevent the development of decay and/or – optional – the
development of disfiguring organisms in wood and, where suitable, in wood-based products.
NOTE 1 The method may also be used to test other treated wood species and naturally durable timbers. It
may be adapted for testing the field performance of other wood based systems and treatments designed to
enhance durability, for example treated or untreated wood based composites, timber treated with non-biocidal
systems, chemically modified or heat treated timber.
NOTE 2 Although the test is used to assess decay, it is possible to use the method to additionally assess stain
or each separately when relevant.
2 Normative reference
This Technical Specification incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this Technical Specification only when incorporated in it by amendment
or revision. For undated references the latest edition of the publication referred to applies (including
amendments).
EN 212, Wood preservatives — Guide to sampling and preparation for analysis of wood preservatives
and treated timber.
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of this Technical Specification, the following definitions, symbols and abbreviations
apply :
3.1.1
active ingredient(s)
individual chemical compound or compounds included in the wood preservative product to give it
specific activity against the particular biological agencies of deterioration
3.1.2
additional process
any process or application of a product, as defined by the supplier, designed to improve the
effectiveness of the preservative
3.1.3
penetrating treatment process
process which includes features or procedures intended to overcome the natural resistance of wood to
penetration by a wood preservative product in its ready for use form
NOTE Such processes include for example currently practised technologies of diffusion treatments, double-
vacuum and vacuum-pressure methods.
3.1.4
superficial application process
process which does not include particular features or procedures intended to overcome the natural
resistance of wood to penetration by a wood preservative product in its ready for use form
NOTE Such processes include for example brush and spray techniques and short-term immersion (dipping)
processes in which wood normally has only a few minutes contact time with the preservative.
3.1.5
representative sample
sample having its physical or chemical characteristics identical with the volumetric average
characteristics of the total volume being sampled (see EN 212)
3.1.6
supplier
sponsor of the test
3.1.7
target retention
retention recommended by the supplier
3.1.8
application rate
amount of preservative product per square metre to be applied in superficial processes recommended
by the supplier
3.2 Symbols and abbreviations
3.2.1
nUD
V
nominal median rating for the upper side of the lap-joints for sets of replicates at the assessment of the
extent of decay
3.2.2
nLD
V
nominal median rating for the lower side of the lap-joints for sets of replicates at the assessment of the
extent of decay
3.2.3
nJD
V
nominal median rating for surfaces within the joint areas of the lap-joints for sets of replicates at the
assessment of the extent of decay
NOTE For symbols for the optional assessment of attack by staining fungi see Annex C.
4 Principle
Jointed specimens (lap-joints) consisting of two overlapping parts (joint members) held together
mechanically are placed horizontally, out of contact with the ground and exposed to the weather. The
lap-joints are dismantled and examined at intervals. The extent of microbiological attack on the
external surfaces and within the joint areas is rated according to a specified rating system. Data for
lap-joints treated with the test product are compared with those generated from untreated specimens
to assess relative effectiveness.
5 Materials
5.1 Test specimens
5.1.1 Wood species
The reference species is Scots pine (Pinus sylvestris Linnaeus)
NOTE Additional tests may be carried out using other species.
5.1.2 Quality of wood
The wood shall be free from visible cracks, stain, decay, insect damage and other defects. Some
knots are permitted. 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. Use wood without reaction wood or juvenile wood.
5.1.3 Provision of test specimens
The longitudinal faces shall be parallel to the direction of the grain. The annual rings shall have a
contact angle of not greater than 10 ° to the broad faces of the test specimens. Make transverse cuts,
neatly to give sharp edges and a fine-sawn finish to the end-grain surfaces.
All the wood used in the test shall have been handled and dried in the same way.
NOTE 1 If additional wood species are used, these should be mentioned in the test report together with their
density
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