Paints and varnishes - Coating materials and coating systems for exterior wood - Part 9: Determination of pull-off strength after water exposure

This Technical Specification specifies a method for assessing the resistance of a coating system on wet wood to separation from the substrate by measuring the force necessary to detach or rupture the coating system by a normal tensile strain applied through an attached stud (dolly). Additional information is gained by noting the type and locus of failure. The force required for detachment will depend on several factors including the adhesion of the coating to the substrate and between intermediate coating layers. The procedure is not regarded as a direct means of measuring adhesion but an indicator of adhesive performance (adherence) under wet conditions.
A procedure for wetting the wood substrate is described. The test method is only suitable for wood and wood based substrates.
For dry adhesion the test method is allowed to be carried out without wetting in which case it will differ very little from ISO 4624.

Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Teil 9: Bestimmung der Abreißfestigkeit nach Wasserbeanspruchung

Diese Technische Spezifikation legt ein Verfahren zur Beurteilung der Beständigkeit eines Beschichtungs-systems auf nassem Holz gegen seine Entfernung vom Substrat fest; dies geschieht durch Messen der Kraft, die zum Lösen oder Brechen des Beschichtungssystems mithilfe einer normalen Zugbelastung erforderlich ist, die über einen verbundenen Bolzen (Stempel) angewandt wird. Weitere Informationen ergeben sich durch Notieren von Fehlerart und -ort. Die zum Lösen erforderliche Kraft hängt von mehreren Faktoren ab, einschließlich der Haftfestigkeit der Beschichtung auf dem Substrat und innerhalb von Zwischenbe-schichtungen. Das Verfahren wird nicht als direktes Mittel zur Messung der Haftfestigkeit betrachtet, sondern als Indikator für die Klebeleistung (Haftfähigkeit) bei Nässe.
Ein Verfahren zur Benetzung des Holzsubstrates wird beschrieben. Das Prüfverfahren eignet sich nur für Holz und auf Holz basierende Substrate.
Für Trockenhaftfestigkeit darf das Prüfverfahren ohne Benetzung durchgeführt werden; in diesem Fall weicht es nur geringfügig von EN ISO 4624 ab.

Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois extérieur - Partie 9: Détermination de la résistance à l’arrachement après exposition à l’eau

La présente Spécification technique spécifie une méthode d'évaluation de la résistance d'un système de peinture sur bois humide à la séparation du subjectile en mesurant la force nécessaire pour détacher ou rompre le système de peinture par une contrainte de traction normale appliquée au moyen d'un goujon (plot). Des informations supplémentaires sont obtenues en notant le type et l'emplacement de la rupture. La force requise pour le décollement dépendra de plusieurs facteurs, notamment de l'adhérence du revêtement au subjectile et entre les couches intermédiaires du revêtement. Le mode opératoire n'est pas considéré comme un moyen direct de mesure de l'adhésion, mais comme un indicateur de la performance adhésive (adhérence) dans des conditions humides.
Une méthode de mouillage du subjectile en bois est décrite. La méthode d'essai convient uniquement aux subjectiles en bois et en matériaux dérivés du bois.
Pour l'adhérence en condition sèche, il est permis d'utiliser la méthode d'essai sans mouillage, auquel cas elle diffèrera très peu de l'EN ISO 4624.

Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 9. del: Ugotavljanje razslojne trdnosti po izpostavitvi vodi

Ta tehnična specifikacija določa metodo za ocenjevanje odpornosti premaznih sistemov na mokrem lesu proti ločevanju od podlage z merjenjem sile, ki je potrebna, da se premazni sistem odtrga ali pretrga z uporabo normalnega natega prek pritrjenega podpornika. Dodatne informacije se lahko pridobijo z zapisom vrste in lokacije okvare. Sila, potrebna za odtrganje, bo odvisna od različnih dejavnikov, vključno s sprijemnostjo premaza s podlago in med vmesnimi plastmi premaza. Postopek ni mišljen kot neposredno sredstvo za merjenje sprijemnosti, temveč kot kazalnik sprijemne učinkovitosti (sprijetosti) v mokrih pogojih.
Opisan je postopek za močenje lesnega substrata. Preskusna metoda je primerna samo za lesne substrate in substrate na osnovi lesa.
Preskusno metodo je za suho sprijemnost dovoljeno izvesti brez močenja, pri čemer se nekoliko razlikuje od standarda ISO 4624.

General Information

Status
Published
Public Enquiry End Date
09-May-2018
Publication Date
08-Jan-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Oct-2018
Due Date
15-Dec-2018
Completion Date
09-Jan-2019

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Standards Content (sample)

SLOVENSKI STANDARD
SIST-TS CEN/TS 927-9:2019
01-marec-2019

%DUYHLQODNL3UHPD]LLQSUHPD]QLVLVWHPL]D]DãþLWROHVD]D]XQDQMRXSRUDER

GHO8JRWDYOMDQMHUD]VORMQHWUGQRVWLSRL]SRVWDYLWYLYRGL

Paints and varnishes - Coating materials and coating systems for exterior wood - Part 9:

Determination of pull-off strength after water exposure
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 9: Bestimmung der Abreißfestigkeit nach Wasserbeanspruchung

Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois extérieur -

Partie 9: Détermination de la résistance à l’arrachement après exposition à l’eau

Ta slovenski standard je istoveten z: CEN/TS 927-9:2018
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
SIST-TS CEN/TS 927-9:2019 en,fr,de

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

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SIST-TS CEN/TS 927-9:2019
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SIST-TS CEN/TS 927-9:2019
CEN/TS 927-9
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
December 2018
TECHNISCHE SPEZIFIKATION
ICS 87.040
English Version
Paints and varnishes - Coating materials and coating
systems for exterior wood - Part 9: Determination of pull-
off strength after water exposure

Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und

de peinture pour le bois extérieur - Partie 9 : Beschichtungssysteme für Holz im Außenbereich - Teil

Détermination de la résistance à l'arrachement après 9: Bestimmung der Abreißfestigkeit nach

exposition à l'eau Wasserbeanspruchung

This Technical Specification (CEN/TS) was approved by CEN on 11 June 2018 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, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 927-9:2018 E

worldwide for CEN national Members.
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CEN/TS 927-9:2018 (E)
Contents Page

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

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

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

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

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

4 Principle ............................................................................................................................................................. 5

5 Apparatus and materials .............................................................................................................................. 6

5.1 Test apparatus.................................................................................................................................................. 6

5.2 Test dollies ........................................................................................................................................................ 6

5.3 Adhesives ........................................................................................................................................................... 6

6 Test panels ......................................................................................................................................................... 7

6.1 Wood substrate ................................................................................................................................................ 7

6.2 Conditioning ...................................................................................................................................................... 7

6.3 Coating of test panels ..................................................................................................................................... 7

6.3.1 Coated panels not exposed to weathering ............................................................................................. 7

6.3.2 Coated panels exposed to weathering ..................................................................................................... 7

7 Procedure........................................................................................................................................................... 8

7.1 Testing conditions .......................................................................................................................................... 8

7.2 Preparation of the samples ......................................................................................................................... 8

7.3 Order of the test samples ............................................................................................................................. 8

7.3.1 Non-standard panels ...................................................................................................................................... 8

7.3.2 Standard EN 927 exposure panels ............................................................................................................ 8

7.4 Testing procedure ........................................................................................................................................ 10

7.5 Evaluation of fracture ................................................................................................................................. 10

8 Calculation and expression of results ................................................................................................... 11

9 Precision statement .................................................................................................................................... 11

10 Test report ...................................................................................................................................................... 11

Annex A (informative) Interpretation of test results ................................................................................... 13

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

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European foreword

This document (CEN/TS 927-9:2018) has been prepared by Technical Committee CEN/TC 139 “Paints

and varnishes”, the secretariat of which is held by DIN.

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.

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

following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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Introduction

This Technical Specification is one of two methods for assessing the resistance of the coating system to

removal by external forces provided by either cross-cutting or direct pull-off, both methods carried out

under wet conditions. Two existing ISO Standards (EN ISO 2409 and EN ISO 4624) specify similar test

methods for dry substrates in general, but make no provision for wet conditions, where wood coatings

are known to be particularly vulnerable. Both of the new methods take full account of the special nature

of wood as a substrate in terms of the method of wetting and the selection of the substrate.

Most of the currently used exterior coating systems are characterised by their propensity to being

penetrated by moisture both into and out of the wood. It might therefore be difficult to achieve a good

adhesion of these coatings under high moisture conditions. In cases of an already damaged coating film

or an increased presence of moisture in the boundary zone to the wood surface, even a short-term

exposure to water can be sufficient to weaken the adhesion of a coating film either to the substrate or

within the coating system. The described method is suitable for the testing of coatings for exterior wood

or wood based materials and applicable for testing the wet adhesion of a single coat or multi-coat

system. In this test procedure the force, which is necessary to detach or pull-off the coating

perpendicular to the substrate is measured.

Furthermore, the nature of fracture of the coating is assessed to validate or reject and assist in the

interpretation of the result.
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1 Scope

This Technical Specification specifies a method for assessing the resistance of a coating system on wet

wood to separation from the substrate by measuring the force necessary to detach or rupture the

coating system by a normal tensile strain applied through an attached stud (dolly). Additional

information is gained by noting the type and locus of failure. The force required for detachment will

depend on several factors including the adhesion of the coating to the substrate and between

intermediate coating layers. The procedure is not regarded as a direct means of measuring adhesion but

an indicator of adhesive performance (adherence) under wet conditions.

A procedure for wetting the wood substrate is described. The test method is only suitable for wood and

wood based substrates.

For dry adhesion the test method is allowed to be carried out without wetting in which case it will differ

very little from EN ISO 4624.
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 927-3, Paints and varnishes — Coating materials and coating systems for exterior wood — Part 3:

Natural weathering test

EN 927-6, Paints and varnishes — Coating materials and coating systems for exterior wood — Part 6:

Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water

EN 23270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

and testing (ISO 3270)
EN ISO 4624, Paints and varnishes — Pull-off test for adhesion (ISO 4624)
3 Terms and definitions
No terms and definitions are listed in this document.

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 http://www.iso.org/obp
4 Principle

The product or system under test is applied at uniform thickness to flat wood based panels of uniform

surface texture.

After drying/curing the coating system, dollies are glued directly to the surface of the coated panels.

After curing of the adhesive, a circular groove is milled or cut around the dollies. Water is deposited in

the groove for a time interval that ensures a complete wetting of the wood–coating interface beneath

the dollies.

After the complete wetting of the wood-coating interphase the bonded dolly/substrate assemblies are

placed in a suitable tensile tester. The bonded assemblies are subjected to a controlled tensile test (pull-

off test) and the force required to break is measured.
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The test result is the tensile stress necessary to break the weakest interface (adhesive failure) or the

weakest component (cohesive failure) of the test assembly. Mixed adhesive/cohesive failure can also

occur and should be recorded as shown in Table 1.
5 Apparatus and materials
5.1 Test apparatus

Mobile test apparatus or tension testing machines as described in EN ISO 4624. The tensile stress shall

be applied in a direction perpendicular to the plane of the coa
...

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