SIST-TS CEN/TS 16359:2012

Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of knot staining resistance of wood coatings

This document specifies a test method for assessing the discoloration of coating systems on wood due to wood extractives from knots. The discoloration is measured by colorimetry and the result is stated as the colour difference between the coated surface on the knot and the coated surface beside the knot.

Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Beurteilung der Resistenz der Astausfärbung von Holzbeschichtungen

Dieses Dokument legt ein Prüfverfahren zur Beurteilung der Verfärbung von Beschichtungssystemen auf Holz aufgrund von Holzextraktstoffen aus Ästen fest. Die Verfärbung wird durch Farbmessung gemessen und das Ergebnis als der Farbabstand zwischen der beschichteten Oberfläche auf dem Ast und der beschichteten Oberfläche neben dem Ast angegeben.

Peintures et vernis - Produits de peintures et systèmes de peintures pour bois en extérieur - Evaluation de la résistance des revêtements pour bois aux taches provoquées par les nœuds

Le présent document spécifie une méthode d’essai pour évaluer la décoloration des systèmes de peintures sur bois, causée par des extractibles situés dans les nœuds du bois. La décoloration est mesurée par colorimétrie et le résultat est énoncé comme la différence de couleur entre la surface du nœud peinte sur le nœud et la surface peinte à côté du nœud.

Barve in laki - Premazi in premazni sistemi za zaščito lesa v zunanji uporabi - Ocenjevanje odpornosti premazov proti obarvanju zaradi lesnih grč

Ta tehnična specifikacija določa preskusno metodo za oceno razbarvanja premaznih sistemov na lesu zaradi lesnih ekstraktov iz grč. Razbarvanje se meri na podlagi kolorimetrije, pri čemer se rezultat navede kot razlika v barvi med premazano površino na grči in premazano površino poleg grče.

General Information

• Status: Withdrawn
• Publication Date: 09-Sep-2012
• Withdrawal Date: 05-Mar-2020
• ICS: 87.040 - Paints and varnishes
• Technical Committee: POH - Furniture
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 05-Mar-2020
• Due Date: 28-Mar-2020
• Completion Date: 06-Mar-2020
• Ref Project: CEN/TS 16359:2012 - Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of knot staining resistance of wood coatings

Relations

• Replaced By: SIST EN 927-7:2020 - Paints and varnishes - Coating materials and coating systems for exterior wood - Part 7: Assessment of knot staining resistance of wood coatings
• Effective Date: 01-Jun-2020

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TS CEN/TS 16359:2012
01-oktober-2012
%DUYHLQODNL3UHPD]LLQSUHPD]QLVLVWHPL]D]DãþLWROHVDY]XQDQMLXSRUDEL
2FHQMHYDQMHRGSRUQRVWLSUHPD]RYSURWLREDUYDQMX]DUDGLOHVQLKJUþ
Paints and varnishes - Coating materials and coating systems for exterior wood -
Assessment of knot staining resistance of wood coatings
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Beurteilung der Resistenz der Astausfärbung von Holzbeschichtungen
Peintures et vernis - Produits de peintures et systèmes de peintures pour bois en
extérieur - Evaluation de la résistance des revêtements pour bois aux taches provoquées
par les nœuds
Ta slovenski standard je istoveten z: CEN/TS 16359:2012
ICS:
87.040 Barve in laki Paints and varnishes
SIST-TS CEN/TS 16359:2012 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 16359:2012

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SIST-TS CEN/TS 16359:2012


TECHNICAL SPECIFICATION
CEN/TS 16359

SPÉCIFICATION TECHNIQUE

TECHNISCHE SPEZIFIKATION
July 2012
ICS 87.040
English Version
Paints and varnishes - Coating materials and coating systems
for exterior wood - Assessment of knot staining resistance of
wood coatings
Peintures et vernis - Produits de peintures et systèmes de Beschichtungsstoffe - Beschichtungsstoffe und
peintures pour bois en extérieur - Évaluation de la Beschichtungssysteme für Holz im Außenbereich -
résistance des revêtements pour bois aux taches Beurteilung der Beständigkeit von Holzbeschichtungen
provoquées par les nœuds gegen Astausfärbung
This Technical Specification (CEN/TS) was approved by CEN on 9 April 2012 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16359:2012: E
worldwide for CEN national Members.

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SIST-TS CEN/TS 16359:2012
CEN/TS 16359:2012 (E)
Contents Page
Foreword .3
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Test panels .5
4.1 Wood .5
4.2 Sampling of coating products .8
4.3 Preparation of coated panels .8
5 Equipment .8
5.1 Apparatus for accelerated ageing .8
5.2 Apparatus for colour measurements .8
6 Procedure of exposure .8
7 Measurements .8
7.1 Measurement of colour difference .8
7.2 Calculation of ∆E* .9
7.3 Statistical evaluation .9
7.4 Flow diagram for test .9
8 Test report . 10
Annex A (informative) Explanatory notes . 11
A.1 General . 11
A.2 Wood material . 11
A.3 Impregnation . 11
A.4 Precision . 11
Bibliography . 12

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SIST-TS CEN/TS 16359:2012
CEN/TS 16359:2012 (E)
Foreword
This document (CEN/TS 16359:2012) 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 [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
3

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SIST-TS CEN/TS 16359:2012
CEN/TS 16359:2012 (E)
Introduction
The treatment of exterior wood surfaces has both aesthetic and protective functions. A vital purpose of a
coating system is to protect against discoloration caused by wood extractives. Discoloration can be
characterised as tannin staining or as knot staining.
This document provides a method for assessment of discoloration of coatings on wood caused by wood
extractives in knots, i.e. it relates to knot staining only.
4

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SIST-TS CEN/TS 16359:2012
CEN/TS 16359:2012 (E)

1 Scope
This Technical Specification specifies a test method for assessing the discoloration of coating systems on
wood due to wood extractives from knots. The discoloration is measured by colorimetry and the result is
stated as the colour difference between the coated surface on the knot and the coated surface beside the
knot.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 14298, Sawn timber — Assessment of drying quality
EN ISO 4892-2:2006, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
(ISO 4892-2:2006)
EN ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling (ISO 15528)
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications
ISO 7724-2, Paints and varnishes — Colorimetry — Part 2: Colour measurement
ISO 7724-3, Paints and varnishes — Colorimetry — Part 3: Calculation of colour differences
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
tannin staining
appearance of discoloration on coated surfaces caused by wood extractives in the substrate
3.2
knot staining
appearance of discoloration on coated surfaces caused by wood extractives in knots
3.3
wood extractives
low-molecular wood components soluble in organic solvents or water
3.4
sound knot
knot that, at the relevant surface, is intergrown with the surrounding wood along more than 75 % of its
circumference and is free of decay
[SOURCE: EN 844-9:1997, 9.1.14 and EN 844-9:1997, 9.1.18].
4 Test panels
4.1 Wood
The raw material for the test panels shall be panels of pine (Pinus silvestris) free from visible cracks, blue
stain, bacterial attack and rot damage. The panels shall be dried to target moisture content 18 % in
5

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accordance with EN 14298. The drying temperature shall not excee
...