SIST EN 12037:2023
(Main)Wood preservatives - Field test method for determining the relative protective effectiveness of a wood preservative exposed out of ground contact - Horizontal lap-joint method
Wood preservatives - Field test method for determining the relative protective effectiveness of a wood preservative exposed out of ground contact - Horizontal lap-joint method
This document 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 can also be used to test other treated wood species and naturally durable timbers. It can 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 Altough the test is used to assess decay, it is possible to use the method to additionally assess stain or each separately when relevant.
Holzschutzmittel - Freilandprüfung zur Bestimmung der relativen Wirksamkeit eines Holzschutzmittels ohne Erdkontakt - Verfahren mit horizontaler Überblattung (Lap-Joint)
Dieses Dokument beschreibt ein Verfahren zur Prüfung von Holzschutzmitteln, die zur Behandlung von Holz vorgesehen sind, das ohne Erdkontakt und ohne zusätzlichen Schutz durch eine Oberflächenbeschichtung der Witterung ausgesetzt werden soll.
Das Verfahren zur Prüfung handelsüblicher oder zur Entwicklung neuer Holzschutzmittel anwendbar, die mit für die gewerbliche Praxis geeigneten Verfahrensweisen auf /eingebracht werden. Das Verfahren ist auf chemische Erzeugnisse anwendbar, die einzeln oder in Kombination verwendet werden, um die Entwicklung von Fäulnis in Holz und/oder — wahlweise — die Entwicklung von verfärbenden Organismen in Holz und, falls zutreffend, in Holzprodukten, zu verhindern.
ANMERKUNG 1 Das Verfahren kann auch zur Prüfung von anderen behandelten Holzarten und natürlich dauerhaften Nutzhölzern angewendet werden. Es kann zur Prüfung der Gebrauchstauglichkeit im Freiland von anderen Systemen auf der Grundlage von Holz und von Behandlungsverfahren angewendet werden, die dafür ausgelegt sind, die Dauerhaftigkeit zu erhöhen, z. B. bei behandelten oder unbehandelten Holzverbundwerkstoffen, Nutzholz, das mit biozidfreien Systemen behandelt wurde, und chemisch modifiziertem oder wärmebehandeltem Nutzholz.
ANMERKUNG 2 Obwohl die Prüfung zur Bewertung der Fäulnis angewendet wird, kann dieses Verfahren, falls zutreffend, zur zusätzlichen Bewertung der Verfärbung oder zur separaten Bewertung von Fäulnis und Verfärbung eingesetzt werden.
Produits de préservation du bois - Méthode d'essai sur le terrain pour déterminer l'efficacité protectrice relative d'un produit de préservation du bois sans contact avec le sol - Méthode avec un assemblage à joint superposé
Le présent document décrit une méthode d'essai de produits de préservation du bois destinés au bois exposé aux intempéries hors de contact avec le sol, sans protection supplémentaire par un revêtement de surface.
La méthode est applicable à l'essai des produits de préservation commerciaux ou expérimentaux appliqués par des techniques appropriées utilisées dans la pratique. La méthode s'applique aux produits chimiques utilisés individuellement ou en combinaison pour empêcher le développement de pourriture et/ou — en option — d'organismes de discoloration dans le bois et, le cas échéant, dans les matériaux dérivés du bois.
NOTE 1 La méthode peut aussi être utilisée pour réaliser des essais sur d'autres essences de bois traités et sur des bois naturellement durables. Elle peut être adaptée pour tester les performances in situ d'autres systèmes à base de bois et des traitements destinés à accroître la durabilité, par exemple des composites à base de bois traités ou non traités, des bois traités avec des systèmes non biocides, des bois modifiés chimiquement ou traités à la chaleur.
NOTE 2 Bien que l'essai soit destiné à évaluer la pourriture, il est possible d'utiliser la méthode pour évaluer également la discoloration, ou les évaluer chacune séparément si c'est utile.
Zaščitna sredstva za les - Terenska preskusna metoda za ugotavljanje relativne preventivne učinkovitosti biocidnega proizvoda za zaščito lesa nad zemljo - Metoda z vodoravnim preklopnim spojem
Ta dokument opisuje preskusno metodo zaščitnih sredstev za les, ki se uporabljajo za les, izpostavljen vremenskim vplivom nad zemljo brez dodatne zaščite s površinskim premazom.
Metoda se uporablja za preskušanje komercialnih in eksperimentalnih zaščitnih sredstev, ki se jih nanese z metodami, primernimi za komercialno prakso. Metoda se uporablja za kemične izdelke, ki se uporabljajo posamezno ali v kombinaciji in preprečujejo razvoj gnilobe in/ali tudi razvoj organizmov, ki uničujejo les oziroma izdelke na osnovi lesa.
OPOMBA 1: Metodo je mogoče uporabiti tudi za preskušanje drugih obdelanih vrst lesa in naravno obstojnega lesa. Prilagoditi jo je mogoče za preizkušanje terenske učinkovitosti drugih sistemov in obdelav na osnovi lesa, namenjenih povečanju vzdržljivosti, na primer kompozitov na osnovi obdelanega ali neobdelanega lesa, lesa, obdelanega z nebiocidnimi sistemi, kemično modificiranega ali toplotno obdelanega lesa.
OPOMBA 2: Čeprav se preskus uporablja za oceno gnilobe, je metodo mogoče uporabiti dodatno tudi za oceno madežev ali če je treba, vsakega posebej.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12037:2023
01-marec-2023
Nadomešča:
SIST-TS CEN/TS 12037:2005
Zaščitna sredstva za les - Terenska preskusna metoda za ugotavljanje relativne
preventivne učinkovitosti biocidnega proizvoda za zaščito lesa nad zemljo -
Metoda z vodoravnim preklopnim spojem
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 - Freilandprüfung zur Bestimmung der relativen Wirksamkeit eines
Holzschutzmittels ohne Erdkontakt - Verfahren mit horizontaler Überblattung (Lap-Joint)
Produits de préservation du bois - Méthode d'essai sur le terrain pour déterminer
l'efficacité protectrice relative d'un produit de préservation du bois sans contact avec le
sol - Méthode avec un assemblage à joint superposé
Ta slovenski standard je istoveten z: EN 12037:2022
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
SIST EN 12037:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 12037:2023
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SIST EN 12037:2023
EN 12037
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 71.100.50 Supersedes CEN/TS 12037:2003
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 - Méthode d'essai sur Holzschutzmittel - Freilandprüfung zur Bestimmung
le terrain pour déterminer l'efficacité protectrice der relativen Wirksamkeit eines Holzschutzmittels
relative d'un produit de préservation du bois sans ohne Erdkontakt - Verfahren mit horizontaler
contact avec le sol - Méthode avec un assemblage à Überblattung (Lap-Joint)
joint superposé
This European Standard was approved by CEN on 30 October 2022.
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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12037:2022 E
worldwide for CEN national Members.
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SIST EN 12037:2023
EN 12037:2022 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols . 6
3.1 Terms and definitions . 6
3.2 Symbols . 7
4 Principle . 8
5 Materials . 8
5.1 Test specimens . 8
5.2 End-seal compounds .10
6 Apparatus and equipment .10
7 Sample of wood preservative .12
8 Test lap-joints .12
8.1 Initial end sealing .12
8.2 Treating process .12
8.3 Retention of preservative .12
8.4 Post-treatment handling of the test lap-joints .13
8.4.1 Conditioning .13
8.4.2 Final end sealing (prior to exposure) .13
8.4.3 Labelling .13
8.4.4 Assembling lap-joints .13
9 Untreated control lap-joints.13
10 Exposure test site .13
10.1 Selection of test site .13
10.2 Installation of the lap-joints at the test site .13
11 Inspection .14
12 Assessment .14
13 Duration of the test .15
14 Validity of test .15
15 Test report .15
Annex A (informative) Information on an additional test with a reference preservative and
on treatment processes .17
A.1 Additional test with a reference preservative .17
A.1.1 General .17
A.1.2 Reference preservative .17
A.1.3 Additional reference preservative 1 .17
A.1.4 Additional reference preservative 2 .17
A.1.5 Tolerances of variation .18
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EN 12037:2022 (E)
A.1.6 Reference lap-joint . 18
A.2 Model treatments methods . 19
A.2.1 General . 19
A.2.2 Brushing . 19
A.2.3 Spraying in a spray tunnel . 19
A.2.4 Dip process . 19
A.2.5 Steeping . 19
A.2.6 Double vacuum process . 20
A.2.7 Full-cell process . 20
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
C.1 General . 27
C.2 Assessment . 27
Annex D (informative) Test field site . 28
Bibliography . 29
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SIST EN 12037:2023
EN 12037:2022 (E)
European foreword
This document (EN 12037:2022) 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 European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes CEN/TS 12037:2003.
Test results obtained with earlier versions of CEN/TS 12037 are still valid.
In relation to CEN/TS 12037:2003, the following main modifications have been made:
— change of variation in density of test specimens;
— change of grading system for evaluation.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Türkiye and the United
Kingdom.
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SIST EN 12037:2023
EN 12037:2022 (E)
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
microorganisms 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 should 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.
The procedures described in this document are intended to be carried out by suitably trained and/or
supervised specialists. Appropriate safety precautions should be observed throughout the use of the
document.
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EN 12037:2022 (E)
1 Scope
This document specifies a test method 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 materials.
NOTE 1 The method can also be used to test other treated wood species and naturally durable timbers. It can 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. Guidance on samples and sampling of naturally durable wood and
modified wood is found in EN 350.
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 references
There are no normative references in this document.
3 Terms, definitions and symbols
For the purposes of this document, the following terms and definitions 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
3.1 Terms and definitions
3.1.1
active ingredient
chemical compound or compounds included in a wood preservative to give it specific activity against the
biological agents of deterioration
3.1.2
penetrating treatment process
process which includes features or procedures intended to overcome the natural resistance of wood to
penetration by a wood preservative in its ready for use form
Note 1 to entry: Such processes include for example currently practised technologies of diffusion treatments,
double-vacuum and vacuum-pressure methods.
3.1.3
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 in its ready for use form
Note 1 to entry: 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.
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3.1.4
supplier
sponsor of the test
3.1.5
target retention
retention recommended by the supplier
3.1.6
application rate
amount of preservative product per square metre to be applied in superficial processes recommended
by the supplier
3.2 Symbols
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
3.2.4
nUS
V
nominal median rating for the upper side of the lap-joints for sets of replicates at the assessment of the
extent of attack by staining fungi
3.2.5
nLS
V
nominal median rating for the lower side of the lap-joints for sets of replicates at the assessment of the
extent of attack by staining fungi
3.2.6
nJUS
V
nominal median rating for surfaces within the joint areas of the upper member of the lap-joints for sets
of replicates at the assessment of the extent of attack by staining fungi
3.2.7
nJLS
V
nominal median rating for surfaces within the joint areas of the lower member of the lap-joints for sets
of replicates at the assessment of the extent of attack by staining fungi
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EN 12037:2022 (E)
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
Susceptible wood species that can be completely penetrated with preservative shall be chosen as follows:
— for every test the sapwood of Scots pine (Pinus sylvestris L) shall be used;
— it is recommended that a hardwood species of local importance is included if the preservative is
expected to be used in this type of wood;
— if desired other wood species or wood-based materials may be incorporated in the test.
5.1.2 Wood quality
The wood shall be straight-grained and free from visible cracks, stain, decay, insect damage and other
defects. Some knots are permitted as specified in 5.1.3. The wood shall not have been water-stored,
floated, chemically treated, steamed or dried at temperatures above 60 °C. The wood shall originate from
trees preferably felled in winter.
The Scots pine shall be exclusively sapwood containing little resin and having between 2,5 and 10 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.
If other wood species are to be used the range in the number of annual rings per 10 mm for each wood
species shall be mentioned in the test report.
5.1.3 Provisions 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.
Wood from at least three trees shall be used and evenly distributed among the different groups of lap-
joints.
Condition in a conditioning chamber (see 6.2) the timber stock to a moisture content of (12 ± 2) % mass
fraction (for Scots pine) %. Prepare lengths of timber with (38 ± 1) mm × (85 ± 1) mm cross section by
sawing (see 6.1) and planing (see Figure 1).
For other wood species condition to constant moisture content.
NOTE 1 A moisture meter of the two-pronged electrical conductivity type is suitable for assessing moisture
content.
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EN 12037:2022 (E)
Each lap-joint shall be prepared from a single piece of wood as two members (180 ± 1) mm long and
separated by no more than 100 mm, to allow for removal of knots and associated grain aberration, to
ensure a tight fit during the test (see Figure 1). Within the overlapping part and the adjacent 50 mm there
shall be no knots and in the rest of each member there are no more than 3 sound knots, the diameter of
which shall not exceed 10 mm.
Machine the joint in a way that after assembly of the two members the pith faces are on the same side of
the assembled joint (see Figure 1).
Store the joint members in the conditioning chamber (6.2) until required for treating.
Dimensions in millimetres
Key
1 cable strap
Figure 1 — Lap-joint
NOTE 2 The lap-joint members can be held together by two cable straps (6.7). The lap-joint is shown without the
weatherproof end seal.
5.1.4 Dimensions and density of test specimens
The dimensions of each lap-joint at (12 ± 2) % moisture content (mass fraction) shall be
(300 ± 2) mm × (85 ± 1) mm × (38 ± 1) mm with an overlapping close fitting part at mid-length of
(60 ± 1) mm (see Figure 1).
In a batch of specimens to be treated, the density of an individual is permitted to differ from the mean
value of the batch by ± 15 %. This tolerance is increased to ± 20 % for the untreated specimens. The mean
density of the treated specimens used for the test shall be recorded in the test report.
5.1.5 Number of lap-joints
Prepare at least 10 lap-joints for each combination of test parameters [wood species (see 5.1.1), test
preservative (see Clause 7), retention level or application rate (see 8.3), and untreated control (see
Clause 9)].
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It is normally necessary to treat a higher number of lap-joints so that the required number can be selected
after treatment (see 8.2) and the inclusion of “abnormal” joints avoided. Optionally extra lap-joints may
be prepared for chemical analyses during exposure.
5.1.6 Labelling of lap-joints
Individual members of each lap-joint shall be assigned unique identification numbers in such a way that
these numbers are retained through all preparation operations. After preservative treatment an
identification label or tag of long-Iasting material shall be affixed e.g to the side of each lap-joint away
from the joint area. The labels shall be of a material which is inert to the wood and the chemicals it
contains after treatment and conditioning.
5.2 End-seal compounds
5.2.1 Preservative resistant end-seal: a material resistant to the penetration of the test preservative
solutions.
Polyvinyl acetate (PVAc) glues have been found to be suitable for many organic solvent formulations. For
water-borne formulations the weatherproof end-seal (5.2.2) may be used.
5.2.2 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.
6 Apparatus and equipment
6.1 Wood working equipment, including a saw capable of producing a fine sawn finish.
6.2 Conditioning chamber, well ventilated and controlled at (20 ± 2) °C and (65 ± 5) % relative
humidity.
6.3 Equipment, suitable for carrying out the treatment specified by the supplier.
6.4 Balance, capable of weighing to the nearest 0,1 g.
6.5 Safety equipment and protective clothing, appropriate for the test product, to ensure the safety
of the operator.
6.6 Labels and fixing pins, both long-lasting, inert and corrosion resistant with similar fixing pins.
6.7 Fixing material, cable straps, inert and weather resistant to be used for fixing the two members of
each joint together.
NOTE A suitable material of the straps is clear or white polyamide with a dimension of ca 360 mm × 5 mm.
These straps can easily be removed at the inspections and replaced by new straps when joints are returned to the
exposure racks.
Alternatively, custom designed stainless steel metal clips may be used. A suitable clip design is shown in
Figure 2.
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SIST EN 12037:2023
EN 12037:2022 (E)
Figure 2 — Suitable clip fabricated out of stainless steel to hold lap-joint in place
Two clips can be needed per test assembly.
6.8 Exposure rack, (see Figure 3) made of preservative treated wood, aluminium profiles or any other
similar durable material and located at least 1 m above ground level and at least 0,5 m above any low
vegetation (see Figure 3). The test specimens shall be separated from the rack by spacing pieces, cross-
section, minimum 5 mm × 5 mm, maximum 10 mm × 10 mm, made of a long-lasting weather resistant
material, that will not react with timber or treated lap-joints (see Figure 4).
Key
1 test samples
Figure 3 — Example of an exposure rack (measurements in meters stating minimum distances
(6.8))
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EN 12037:2022 (E)
Figure 4 — Example of a suitable arrangement of lap-joints on a rack (6.8)
7 Sample of wood preservative
The sample of preservative shall be representative of the product to be tested.
Samples shall be stored and handled in accordance with any written requirements from the supplier
including the product safety data sheet.
For the sampling of preservatives from bulk supplies, the procedures given in EN 212 should be used.
8 Test lap-joints
8.1 Initial end sealing
For each joint member, seal the end grain surface remote from the joint area twice with a preservative
resistant end seal (5.2); allow to dry.
8.2 Treating process
The preservative treatment is carried out after machining and initial end sealing but prior to assembling.
Apply the test preservative to the end-sealed test joint members using the process specified by the
supplier.
It is preferable to test at more than one retention of the active ingredients, ideally three, ranged about
that thought to be appropriate for out of ground contact use.
NOTE A range of model treatments is given in Annex A.
For all penetrating treatment processes, determine and record the volume of the lap-joint members and
its mass to the nearest 0,1 g immediately before treatment. After treatment allow to drain for several
minutes or wipe off excess solution from the surface with a cloth. Then reweigh each member and record
the mass after treatment.
For superficial treatments, calculate the amount of preservative in grams to be applied on each surface
of the lap-joint member to correspond to the uptake in grams or millilitres per square metre
recommended by the supplier. Apply double the calculated amount of preservative to the end grain
surfaces of the joint area.
8.3 Retention of preservative
Calculate the uptake of preservative solution for each member and express the retention in kilograms of
preservative product as supplied for the test per cubic metre of wood for penetrating processes and in
grams per square metre or millilitres per square metre of wood surface for superficial application
processes.
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SIST EN 12037:2023
EN 12037:2022 (E)
For processes resulting in unknown penetration, retention should be expressed in both ways.
NOTE Although long term immersion is considered as a penetrating process (see EN 599-1), normally the
penetration and the uptake of preservative solutions are relative
...
SLOVENSKI STANDARD
oSIST prEN 12037:2021
01-februar-2021
Zaščitna sredstva za les - Terenska preskusna metoda za ugotavljanje relativne
preventivne učinkovitosti biocidnega proizvoda za zaščito lesa izven stika z zemljo
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 - Freilandprüfung zur Bestimmung der relativen Wirksamkeit eines
Holzschutzmittels ohne Erdkontakt - Verfahren mit horizontaler Überblattung (Lap-Joint)
Produits de préservation du bois - Méthode d'essai sur le terrain pour déterminer
l'efficacité protectrice relative d'un produit de préservation du bois sans contact avec le
sol - Méthode avec un assemblage à joint superposé
Ta slovenski standard je istoveten z: prEN 12037
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
oSIST prEN 12037:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 12037:2021
DRAFT
EUROPEAN STANDARD
prEN 12037
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2020
ICS 71.100.50 Will supersede CEN/TS 12037:2003
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 - Méthode d'essai sur Holzschutzmittel - Freilandprüfung zur Bestimmung
le terrain pour déterminer l'efficacité protectrice der relativen Wirksamkeit eines Holzschutzmittels
relative d'un produit de préservation du bois sans ohne Erdkontakt - Verfahren mit horizontaler
contact avec le sol - Méthode avec un assemblage à Überblattung (Lap-Joint)
joint superposé
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 12037:2020 E
worldwide for CEN national Members.
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Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviations . 7
4 Principle . 7
5 Materials . 8
5.1 Test specimens . 8
5.1.1 Wood species . 8
5.1.2 Wood quality . 8
5.1.3 Provisions of test specimens . 8
5.1.4 Dimensions and density of test specimens . 9
5.1.5 Number of lap-joints . 9
5.1.6 Labelling of lap-joints . 9
5.2 End-seal compounds . 10
6 Apparatus and equipment . 10
7 Sample of preservation . 12
8 Test lap-joints . 12
8.1 Initial end sealing . 12
8.2 Treating process . 12
8.3 Retention of preservative . 12
8.4 Post-treatment handling of the test lap-joints . 13
8.4.1 Conditioning . 13
8.4.2 Final end sealing (prior to exposure) . 13
8.4.3 Labelling . 13
8.4.4 Assembling lap-joints . 13
9 Untreated control lap-joints. 13
10 Exposure test site . 13
10.1 Selection of test site . 13
10.2 Installation of the lap-joints a the test site . 13
11 Inspection . 13
12 Assessment . 14
13 Duration of the test . 15
14 Validity of test . 15
15 Test report . 15
Annex A (informative) Information on an additional test with a reference preservative and
on treatment processes . 17
A.1 Additional test with a reference preservative . 17
A.1.1 General . 17
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A.1.2 Reference preservative . 17
A.1.3 Additional reference preservative 1. 17
A.1.4 Additional reference preservative 2. 17
A.1.5 Tolerances of variation . 18
A.1.6 Reference lap-joint . 18
A.1.6.1 General . 18
A.1.6.2 Initial end sealing . 18
A.1.6.3 Treating process . 18
A.1.6.4 Retention of reference preservative . 19
A.1.6.5 Post-treatment handling of the reference lap joints. 19
A.1.6.6 Exposure . 19
A.1.6.7 Inspections . 19
A.1.6.8 Assessment and duration of test . 19
A.2 Model treatments methods . 19
A.2.1 General . 19
A.2.2 Brushing . 19
A.2.3 Spraying in a spray tunnel . 19
A.2.4 Dip process . 19
A.2.5 Steeping . 19
A.2.6 Double vacuum process. 20
A.2.7 Full-cell process . 20
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
C.1 General . 27
C.2 Definitions . 27
C.3 Assessment. 27
Annex D (informative) Test field site . 29
Bibliography . 30
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European foreword
This document (prEN 12037:2020) 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 will supersede CEN/TS 12037:2003.
In relation to CEN/TS 12037:2003, the following main modifications have been made:
— change of variation in density of test specimens;
— change of grading system for evaluation.
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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
microorganisms 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 should 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.
The procedures described in this document are intended to be carried out by suitably trained and/or
supervised specialists. Appropriate safety precautions should be observed throughout the use of the
document.
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1 Scope
This document 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 can also be used to test other treated wood species and naturally durable timbers. It can 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 Altough 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 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 212, Wood preservatives - General guidance on sampling and preparation for analysis of wood
preservatives and treated timber
3 Terms, definitions, symbols and abbreviations
For the purposes of this document, the following definitions, symbols and abbreviations 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 https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
active ingredient
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
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 1 to entry: Such processes include for example currently practised technologies of diffusion treatments,
double-vacuum and vacuum-pressure methods.
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3.1.3
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 1 to entry: 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.
3.1.4
supplier
sponsor of the test
3.1.5
target retention
retention recommended by the supplier
3.1.6
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 1 to entry: 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.
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5 Materials
5.1 Test specimens
5.1.1 Wood species
Susceptible wood species that can be completely penetrated with preservative shall be chosen as follows:
— for every test the sapwood of Scots pine (Pinus Sylvestris L) shall be used;
— if desired other wood species or wood-based materials may be incorporated in the test;
— should be changed for modified wood.
5.1.2 Wood quality
The wood shall be straight-grained and free from visible cracks, stain, decay, insect damage and other
defects. Some knots are permitted as defined in 5.1.3. The wood shall not have been water-stored, floated,
chemically treated, steamed or dried at temperatures above 60 °C. The wood shall originate from trees
preferably felled in winter.
The Scots pine shall be exclusively sapwood containing little resin and having between 2,5 and 10 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.
If other wood species are to be used the range in the number of annual rings per 10 mm for each wood
species shall be mentioned in the report.
5.1.3 Provisions 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 °C 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.
Wood from at least three trees shall be used and evenly distributed among the different groups of lap-
joints.
Condition in a conditioning chamber (see 6.2) the timber stock to (12 ± 2 for Scots pine) % (m/m)
moisture content. Prepare lengths of timber with (38 ± 1) mm × (85 ± 1) mm cross section by sawing (see
6.1) and planning (see Figure 1).
For other wood species condition to constant moister content.
NOTE 1 A moisture meter of the two-pronged electrical conductivity type is suitable for assessing moisture
content.
Each lap-joint shall be prepared from a single piece of wood as two members (180 ± 1) mm long and
separated by no more than 100 mm, to allow for removal of knots and associated grain aberration, to
ensure a tight fit during the test (see Figure 1). Within the overlapping part and the adjacent 50 mm there
shall be no knots and in the rest of each member there are no more than 3 sound knots, the diameter of
which shall not exceed 10 mm.
Machine the joint in a way that after assembly of the two members the pith faces are on the same side of
the assembled joint (see Figure 1).
Store the joint members in the conditioning chamber (6.2) until required for treating.
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Key
1 Cable strap
Figure 1 — Lap-joint
NOTE 2 The lap-joint members can be held together by two cable straps (6.7). The lap-joint is shown without the
weatherproof end seal.
5.1.4 Dimensions and density of test specimens
The dimensions of each lap-joint at (12 ± 2) % (m/m) moisture content shall be (300 ± 2) mm × (85 ± 1)
mm × (38 ± 1) mm with an overlapping close fitting part at mid-length of (60 ± 1) mm (see Figure 1).
In a batch of specimens to be treated, the density of an individual is permitted to differ from the mean
value of the batch by ± 15 %. This tolerance is increased to ± 20 % for the untreated specimens. The mean
density of the treated specimens used for the test shall be recorded in the test report.
5.1.5 Number of lap-joints
Prepare at least 10 lap-joints for each combination of test parameters [wood species (see 5.1.1), test
preservative (see Clause 7), retention level or application rate (see 8.3), and untreated control (see
Clause 10)].
It is normally necessary to treat a higher number of lap-joints so that the required number can be selected
after treatment (see 8.2) and the inclusion of “abnormal” joints avoided. Optionally extra lap-joints may
be prepared for chemical analyses during exposure.
5.1.6 Labelling of lap-joints
Individual members of each lap-joint shall be assigned unique identification numbers in such a way that
these numbers are retained through all preparation operations. After preservative treatment an
identification label or tag of long-Iasting material shall be affixed e.g to the side of each lap-joint away
from the joint area. The labels shall be of a material which is inert to the wood and the chemicals it
contains after treatment and conditioning.
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5.2 End-seal compounds
5.2.1 Preservative resistant end-seal: a material resistant to the penetration of the test preservative
solutions.
Polyvinyl acetate (PVAc) glues have been found to be suitable for many organic solvent formulations. For
water-borne formulations the weatherproof end-seal (5.2.2) may be used.
5.2.2 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.
6 Apparatus and equipment
6.1 Wood working equipment, including a saw capable of producing a fine sawn finish.
6.2 Conditioning chamber, well ventilated and controlled at (20 ± 2) °C and (65 ± 5) % relative
humidity.
6.3 Equipment, suitable for carrying out the treatment specified by the supplier.
6.4 Balance, capable of weighing to the nearest 0,1 g.
6.5 Safety equipment and protective clothing, appropriate for the test product, to ensure the safety
of the operator.
6.6 Labels and fixing pins, both long-lasting, inert and corrosion resistant with similar fixing pins.
6.7 Fixing material, cable straps, inert and weather resistant to be used for fixing the two members of
each joint together.
NOTE A suitable material of the straps is clear or white polyamide with a dimension of ca 360 mm × 5 mm.
These straps can easily be removed at the inspections and replaced by new straps when joints are returned to the
exposure racks.
Alternatively custom designed stainless steel metal clips may be used. A suitable clip design is shown in
Figure 2.
Figure 2 — Suitable clip fabricated out of stainless steel to hold lap-joint in place
Two clips may be needed per test assembly.
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6.8 Exposure rack, (see Figure 3) made of preservative treated wood, aluminium profiles or any other
similar durable material and located at least 1 m above ground level and at least 0,5 m above any low
vegetation (see Figure 3). The test specimens shall be separated from the rack by spacing pieces, cross-
section, minimum 5 mm × 5 mm, maximum 10 mm × 10 mm, made of a long-lasting weather resistant
material, that will not react with timber or treated lap-joints (see Figure 4).
Key
1 Test samples
Figure 3 — Example of an exposure rack (6.8)
Figure 4 — Example of a suitable arrangement of lap-joints on a rack (6.8)
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7 Sample of preservation
The sample of preservative shall be representative of the product to be tested.
Samples shall be stored and handled in accordance with any written requirements from the supplier
including the product safety data sheet.
For the sampling of preservatives from bulk supplies, the procedures given in EN 212 should be used.
8 Test lap-joints
8.1 Initial end sealing
For each joint member, seal the end grain surface remote from the joint area twice with a preservative
resistant end seal (5.2); allow to dry.
8.2 Treating process
The preservative treatment is carried out after machining and initial end sealing but prior to assembling.
Apply the test prese
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