SIST-TS CEN/TS 16499:2014
(Main)Paints and varnishes - Coating materials and coating systems for exterior wood - Resistance to blocking of paints and varnishes on wood
Paints and varnishes - Coating materials and coating systems for exterior wood - Resistance to blocking of paints and varnishes on wood
This Technical Specification specifies a test method for determining, under standard conditions, whether a single-coat film or a multi-coat system of paints and varnishes on wood after a specified drying period is sufficiently dry to avoid damage when two painted surfaces or one painted surface and another surface are placed in contact under pressure and subsequently separated. The method is intended to simulate the conditions when painted articles come into contact which each other. In comparison to EN ISO 9117-2, the conditioning and parameters which influences the behaviour of wood coatings are more specific.
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Bestimmung der Blockfestigkeit
Diese Technische Spezifikation legt ein Prüfverfahren, unter Normbedingungen, zur Bestimmung ob ein Ein- oder Mehrschichtsystem von Beschichtungsstoffen auf Holz nach einer festgelegten Trocknungsdauer ausreichend trocken ist, um Beschädigungen zu vermeiden, wenn zwei beschichtete Flächen oder eine beschichtete Fläche und eine andere Fläche unter Druck Kontakt miteinander haben und danach getrennt werden, fest. Das Verfahren ist dafür vorgesehen, die Bedingungen wenn beschichtete Gegenstände miteinander Kontakt haben, zu simulieren. Im Vergleich zu EN ISO 9117 2 sind die Konditionierung und die Parameter, die das Leistungsverhalten von Holzbeschichtungen beeinflussen, spezifischer.
ANMERKUNG In einigen Ländern wird die Prüfung „Blockfestigkeitsprüfung“ genannt.
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en extérieur - Résistance au blocage des peintures et vernis sur bois
La présente Spécification technique spécifie une méthode d’essai permettant de déterminer, dans les conditions normales, si un feuil monocouche ou un système multi-couches de peintures et vernis sur bois, après une durée spécifiée de séchage, est suffisamment sec pour ne pas être endommagé lorsque deux surfaces peintes ou une surface peinte et une autre surface sont placées en contact sous pression avant d’être séparées. La méthode est destinée à simuler les conditions auxquelles sont soumis des articles peints lorsqu’ils entrent en contact les uns avec les autres. Comparé à l’EN ISO 9117 2, le conditionnement et les paramètres qui influencent le comportement des revêtements pour bois sont plus spécifiques.
NOTE Dans certains pays, l’essai est appelé « essai de résistance au blocage » ou « essai de résistance à l’adhérence ».
Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - Odpornost filmov premazov proti medsebojnemu zlepljanju
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST-TS CEN/TS 16499:2014
01-februar-2014
%DUYHLQODNL3UHPD]LLQSUHPD]QLVLVWHPL]D]DãþLWROHVD]D]XQDQMRXSRUDER
2GSRUQRVWILOPRYSUHPD]RYSURWLPHGVHERMQHPX]OHSOMDQMX
Paints and varnishes - Coating materials and coating systems for exterior wood -
Resistance to blocking of paints and varnishes on wood
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Bestimmung der Blockfestigkeit
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en
extérieur - Résistance au blocage des peintures et vernis sur bois
Ta slovenski standard je istoveten z: CEN/TS 16499:2013
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
SIST-TS CEN/TS 16499:2014 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 16499:2014
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SIST-TS CEN/TS 16499:2014
TECHNICAL SPECIFICATION
CEN/TS 16499
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
November 2013
ICS 87.040
English Version
Paints and varnishes - Coating materials and coating systems
for exterior wood - Resistance to blocking of paints and
varnishes on wood
Peintures et vernis - Produits de peinture et systèmes de Beschichtungsstoffe - Beschichtungsstoffe und
peinture pour le bois en extérieur - Résistance au blocage Beschichtungssysteme für Holz im Außenbereich -
des peintures et vernis sur bois Bestimmung der Blockfestigkeit
This Technical Specification (CEN/TS) was approved by CEN on 12 February 2013 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
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16499:2013: E
worldwide for CEN national Members.
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CEN/TS 16499:2013 (E)
Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Principle .5
5 Apparatus .5
6 Sampling .6
7 Test panels – substrate – test specimens .6
7.1 General .6
7.2 Substrate s1 – Spruce .7
7.3 Substrate s2 – Other wood species .7
7.4 Substrate s3 – Inert substrate .7
7.5 Substrate s4 – Other plane substrates .7
8 Application to the test specimens .8
8.1 General .8
8.2 Application to substrate s1 – spruce, s2 – other wood substrates, or substrate s4 - other
plane substrates .8
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates .8
8.4 Typical dry film thickness on stable wood constructions .9
9 Drying time .9
10 Preparation of test strips and specimen .9
10.1 General .9
10.2 Determination of the dry film thickness .9
11 Conditioning of test strips . 10
12 Application of load. 10
12.1 General . 10
12.2 Load to be applied . 11
12.3 Climatic conditions during loading . 12
13 Evaluation . 13
14 Precision . 14
15 Test report . 14
Annex A (normative) Necessary additional information. 15
Annex B (informative) Suggested form for specifying application parameters . 16
Bibliography . 21
2
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Foreword
This document (CEN/TS 16499:2013) 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.
Remark about climatic conditions:
EN 23270, Paints and varnishes and their raw materials — Temperatures and humidity for conditioning and
testing (ISO 3270) prescribe the use of standard conditions 23/50 [(23 ± 2) °C and (50 ± 5) % relative
humidity]. Historically for wooden substrates there are a lot of mechanical properties which refer to the
alternative standard conditions 20/65 [(20 ± 2) °C and (65 ± 5) % relative humidity] according to
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications. Therefore, the use of
standard conditions 20/65 instead of standard conditions 23/50 could be arranged but should be noted.
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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1 Scope
This Technical Specification specifies a test method for determining, under standard conditions, whether a
single-coat film or a multi-coat system of paints and varnishes on wood after a specified drying period is
sufficiently dry to avoid damage when two painted surfaces or one painted surface and another surface are
placed in contact under pressure and subsequently separated. The method is intended to simulate the
conditions when painted articles come into contact which each other. In comparison to EN ISO 9117-2, the
conditioning and parameters which influences the behaviour of wood coatings are more specific.
NOTE In some countries, the test is called a “block or blocking resistance” test.
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 927-1, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 1:
Classification and selection
EN 23270, Paints and varnishes and their raw materials - Temperatures and humidities for conditioning and
testing (ISO 3270)
EN ISO 1513, Paints and varnishes - Examination and preparation of test samples (ISO 1513)
EN ISO 2808, Paints and varnishes - Determination of film thickness (ISO 2808)
EN ISO 15528, Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
blocking
unwanted adhesion between two surfaces, at least one of which has been coated, when they are left in
contact under load after a given drying period
[SOURCE: EN ISO 4618:2006; 2.29]
Note 1 to entry: Blocking does not apply to bonding of coated surfaces after insufficient drying.
Note 2 to entry: In practice, blocking can occur if coated wood panels are stacked on each other or on windows and
doors if the frames are in direct contact with the faces. Blocking depends on temperature and load (pressure).
Note 3 to entry: The term blocking is also sometimes used to describe agglomerated caked powder.
Note 4 to entry: Unwanted adhesion can lead to damage upon separation.
3.2
load
mass needed to achieve a suitable test pressure
4
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Note 1 to entry: High temperature and humidity increase the challenge at a given load. The application method, film
thickness, drying conditions and climatic conditions should also be taken into account.
3.3
after tack
property of a film to remain sticky after normal drying or curing
[SOURCE: EN ISO 4618:2006; 2.8]
Note 1 to entry: The term after tack can also mean a subjectively stickiness of the surface (“finger tack” or “surface
tack”). This effect however might not necessarily be related to blocking.
3.4
stable mass
mass achieved when the difference between two subsequent weighings within 24 h does not exceed 0,2 %
[SOURCE: EN 927-5:2006; 3.3]
3.5
stackability
resistance to damage due to unwanted adhesion between adjacent surfaces of articles that develops when
these articles are left in contact
[SOURCE: EN ISO 9117-2:2010; 3.1]
4 Principle
The coating material or the coating system under test is applied on test panels or cut strips under specified
conditions. After specified drying time and under specified climatic conditions, the two test panels or cut
stripes are placed crosswise in contact with each other. This assembly is subsequently placed in a test
apparatus to be subjected to a specified load under specified climatic conditions. After a specified period of
time, the load is removed and the test panels manually separated under specific climatic conditions and the
contact areas examined for any damage to the coating in the area of contact.
5 Apparatus
5.1 Weights, of a mass which correspond to the requirements of 12.1.
5.2 Oven or conditioning chamber, depending on the selected climatic conditions during load (see
Clause 11 or 12.3):
— Oven of appropriate size, controlled at a temperature of (50 ± 2) °C or (60 ± 2) °C;
— climatic conditioning chamber where the selected climatic conditions can be achieved.
5.3 Inert substrate for application on Specimen s3.
1)
5.3.1 Test panels (“strips”) made of polyvinyl chloride film free of migrating plasticizers, of sufficient rigidity
to ensure a flat surface, impervious to and unaffected by water or aliphatic organic solvents and of nominal
1)
Suitable test foil made of plasticised PVC is available from Leneta Co. Whitney Road, Mahawa, NJ 07430-3129, USA, or Erichsen
GmbH, Am Iserbach 14, D-58675 Hemer, Germany, or Sheen Instruments, Unit 4, St George’s Industrial Estate, Richmond Road,
Kingston, Surrey KT2 5BQ, United Kingdom. This information is given for the convenience of users of the document and does not
constitute an endorsement by CEN of the product named.
5
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thickness 0,25 mm. Other types of plastics film might be used where the coating material contains solvents
which may adversely affect the PVC film. If the coating delaminates from the substrate before or during the
test, another, more suitable substrate should be used.
5.3.2 Film applicator, preferably automatic, used at an application speed of 10 mm/s to 15 mm/s and fitted
with a doctor blade (see 8.2) with an appropriate gap clearance and a gap width of at least 60 mm.
5.3.3 Use cutting knife, metal template or straight-edge ruler to cut the foils.
5.4 Tools for application on test specimen s1, s2, s4, (e.g. roller, brush, spray equipment) depending on
the paint manufacturer's specification.
6 Sampling
Take a representative sample of the product to be tested (or of each product in the case of a multi-coat
system), in accordance with EN ISO 15528. Examine and prepare each sample for testing in accordance with
EN ISO 1513.
7 Test panels – substrate – test specimens
7.1 General
Depending on the specimens provided for use, different application methods can be required (see Table 1)
Table 1 — Substrate
Substrate (s) Type Description Recommended use
standard test method to
spruce (Picea abies)
s1 wood check a coating system
(see 7.1)
or a individual top coat.
individual wood species
on customer-specific
any wood species requirement (e.g. a
s2 other wood substrates
(see 7.2) coated test specimen
from which test panels
can be cut)
lab test method to
compare different top
coats (simulation of the
s3 inert substrate PVC-foil (see 5.3)
blocking behaviour on
not absorbing
substrates)
lab test method to
e.g. plywood according compare different
s4 other plane substrates
to EN 636 coating materials or
coating systems.
6
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7.2 Substrate s1 – Spruce
The wood shall be spruce (Picea abies) that has been selected to be free from knots and cracks, to be
straight-grained and of normal growth rate (i.e. between 3 and 8 annual rings per 10 mm).
The panels shall be planed all round to a smooth and uniform finish. The inclination of the growth rings to the
test face shall be (45 ± 10)°. See Figure 1. The wood shall be free from blue stain and evidence of surface or
bulk infection. Abnormal porosity shall be avoided. Condition the wood prior to conversion into test panels in
accordance with EN 23270 at (23 ± 2) °C and a relative humidity of (50 ± 5) %. The density of the wood shall
3 3
be between 0,4 g/cm and 0,5 g/cm when measured at an equilibrium moisture content at standard climate
in accordance with EN 23270 at (23 ± 2) °C and a relative humidity of (50 ± 5) %.
Key
front of panel (test face)
1
a min. 3, max. 8 growth rings per 10mm (applies for the whole panel)
α angle of growth rings to test face min. 35°, max. 55°
Figure 1 — Selection of wood
7.3 Substrate s2 – Other wood species
In case of customer-specific requirements or if it might be assumed that other types of wood might give a
different result an alternative wood species should be used as substrate. It is also an option for manufacturers
to provide an already coated test specimen from which test panels can be cut. The chosen panel shall be
precisely described in the test report. The surface of the specimens provided shall be plane. The test
substrate shall be conditioned until constant mass at standard conditions according to EN 23270 [(23 ± 2) °C
and (50 ± 5) % relative humidity].
7.4 Substrate s3 – Inert substrate
See 5.3.
7.5 Substrate s4 – Other plane substrates
The selected substrate should be precisely described in the test report. Alternatives that may be used include
absorbing substrates (e.g. plywood) as well as non absorbing substrates (e.g. glass, aluminium, coated paper,
polymer panels). Absorbing substrates should be conditioned until achieving constant mass at standard
conditions according to EN 23270 [(23 ± 2) °C and (50 ± 5) % relative humidity].
7
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8 Application to the test specimens
8.1 General
Depending on the specimens provided for use, a different type of application might be required (see Table 2).
Table 2 — Type of application
Substrate (s) Type Description Recommended
application
s1 wood spruce (picea abies) According to
(see 7.1) manufacturer's
specification
s2 other wood species any wood species According to
manufacturer's
(see 7.2)
specification or
customer's specification
Optional use of already
coated test specimen
from which test panels
can be cut.
s3 inert substrate PVC-foil (see 5.3) application of the top
coat to be investigated in
a dry film thickness
related to practice, by
means of a film
applicator
s4 other plane substrates e.g. plywood according According to
manufacturer's
to EN 636
specification, customer's
specification or by
application of the top
coat to be investigated in
a dry film thickness
related to practice, by
means of a film
applicator
8.2 Application to substrate s1 – spruce, s2 – other wood substrates, or substrate s4 - other
plane substrates
If nothing else is specified by the manufacturer of the coating system, the conditioned, planed wood
specimens (test panels), shall be manually sanded with abrasive paper (180 grade) just before application.
Dust shall be removed completely. The test panels are coated with the coating system to be tested, closely
following manufacturer's instructions or specification. Examples of possible suitable application methods and
their specification are given in Annex B.
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates
Use an automatic film applicator fitted with a doctor blade with an appropriate gap clearance and gap width
(somewhat wider than the intended final width). Make a draw-down of the prepared sample of coating material
on the test panel to achieve a uniform even film at least 10 mm longer than the intended final test surface.
Apply the coating material under test on the matt surface of the foil. Ensure that the gap clearance is sufficient
to achieve a final dry film thickness corresponding with the paint manufacturer's specification. The applied wet
8
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and the resulting dry film thickness of the coating under test shall be reported. Recommended application
speed is 10 mm/s to 15 mm/s.
8.4 Typical d
...
SLOVENSKI STANDARD
kSIST-TS FprCEN/TS 16499:2012
01-november-2012
%DUYHLQODNL3UHPD]LLQSUHPD]QLVLVWHPL]D]DãþLWROHVDY]XQDQMLXSRUDEL
2GSRUQRVWILOPRYSUHPD]RYSURWLPHGVHERMQHPX]OHSOMDQMX
Paints and varnishes - Coating materials and coating systems for exterior wood -
Resistance to blocking of paints and varnishes on wood
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Bestimmung der Blockfestigkeit
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en
extérieur - Résistance au blocage des peintures et vernis sur bois
Ta slovenski standard je istoveten z: FprCEN/TS 16499
ICS:
87.040 Barve in laki Paints and varnishes
kSIST-TS FprCEN/TS 16499:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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kSIST-TS FprCEN/TS 16499:2012
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kSIST-TS FprCEN/TS 16499:2012
TECHNICAL SPECIFICATION
FINAL DRAFT
FprCEN/TS 16499
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
October 2012
ICS 87.040
English Version
Paints and varnishes - Coating materials and coating systems
for exterior wood - Resistance to blocking of paints and
varnishes on wood
Peintures et vernis - Produits de peinture et systèmes de Beschichtungsstoffe - Beschichtungsstoffe und
peinture pour le bois en extérieur - Résistance au blocage
Beschichtungssysteme für Holz im Außenbereich -
des peintures et vernis sur bois Bestimmung der Blockfestigkeit
This draft Technical Specification is submitted to CEN members for formal vote. It has been drawn up by the Technical Committee CEN/TC
139.
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.
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 Technical Specification. It is distributed for review and comments. It is subject to change without notice
and shall not be referred to as a Technical Specification.
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. FprCEN/TS 16499:2012: E
worldwide for CEN national Members.
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kSIST-TS FprCEN/TS 16499:2012
FprCEN/TS 16499:2012 (E)
Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Principle .6
5 Apparatus .6
6 Sampling .7
7 Test panels – substrate – test specimen .7
7.1 General .7
7.2 Substrate s1 – Spruce .8
7.3 Substrate s2 – Other wood species .9
7.4 Substrate s3 – Inert substrate .9
7.5 Substrate s4 – Other plane substrates . 10
8 Application of the test specimens . 10
8.1 General . 10
8.2 Application to substrate s1 – spruce, s2 – other wood substrates, or substrate s4 - other
plane substrates . 11
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates . 11
8.4 Typical dry film thickness on stable wood constructions . 11
9 Drying time . 11
10 Preparation of test strips and specimen . 12
10.1 General . 12
10.2 Determination of the dry film thickness . 12
11 Conditioning of test strips . 12
12 Application of load. 13
12.1 General . 13
12.2 Pressure load . 14
12.3 Climatic conditions during pressure load . 15
13 Evaluation . 15
14 Precision . 16
15 Test report . 16
Annex A (normative) Necessary additional information . 17
Annex B (informative) Suggested form for specifying application parameters . 18
B.1 General . 18
B.2 Specifying complete coating system. 18
B.3 Equipment . 18
B.4 Process . 18
B.5 Spreading rate . 18
B.6 Flash-off . 19
2
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B.7 Drying and curing . 19
B.8 Overcoating intervals . 19
B.9 Sanding. 19
Bibliography . 23
3
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kSIST-TS FprCEN/TS 16499:2012
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Foreword
This document (FprCEN/TS 16499:2012) has been prepared by Technical Committee CEN/TC 139 “Paints
and varnishes”, the secretariat of which is held by DIN.
This document is currently submitted to the Formal Vote.
Remark about climatic conditions:
EN 23270, Paints and varnishes and their raw materials — Temperatures and humidity for conditioning and
testing (ISO 3270) prescribe the use of standard conditions 23/50 [(23 ± 2) °C and (50 ± 5) % relative
humidity]. Historically for wooden substrates there are a lot of mechanical properties which refer to the
alternative standard conditions 20/65 [(20 ± 2) °C and (65 ± 5) % relative humidity] according to
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications. Therefore the use of
standard conditions 20/65 instead of standard conditions 23/50 could be arranged but should be noted.
4
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kSIST-TS FprCEN/TS 16499:2012
FprCEN/TS 16499:2012 (E)
1 Scope
This Technical Specification specifies a test method for determining, under standard conditions, whether a
single-coat film or a multi-coat system of paints and varnishes on wood after a specified drying period is
sufficiently dry to avoid damage when two painted surfaces or one painted surface and another surface are
placed in contact under pressure and subsequently separated. The method is intended to simulate the
conditions when painted articles come into contact which each other. In comparison to EN ISO 9117-2, Paints
and varnishes — Drying tests — Part 2: Pressure test for stackability the conditioning and parameters which
influences the behaviour of wood coatings are more specific.
NOTE In some countries, the test is called a “block or blocking resistance” test.
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 23270, Paints, varnishes and their raw material — Temperatures and humidities for conditioning and
testing (ISO 3270:1984)
EN ISO 1513, Paints and varnishes — Examination and preparation of test samples
EN ISO 2808, Paints and varnishes — Determination of film thickness
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1
blocking
unwanted adhesion between two surfaces, at least one of which has been coated, when they are left in
contact under load after a given drying period
[Source: EN ISO 4618:2006]
Note 1 to entry Blocking does not apply to bonding of coated surfaces after insufficient drying.
Note 2 to entry In practice blocking may occur if coated wood panels are stacked on each other or on windows and doors if
the frames are in direct contact with the faces. Blocking depends on temperature and load (pressure).
Note 3 to entry The term blocking is also sometimes used to describe agglomerated caked powder.
Note 4 to entry Unwanted adhesion may lead to damage upon separation.
3.2
load
mass needed to achieve a suitable test pressure
Note 1 to entry High temperature and humidity increase the challenge at a given load. The application method, film
thickness, drying conditions and climatic conditions shall also be taken into account.
3.3
after tack
property of a film to remain sticky after normal drying or curing
5
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kSIST-TS FprCEN/TS 16499:2012
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[Source: EN ISO 4618:2006]
Note 1 to entry The term after tack can also mean a subjectively stickiness of the surface ("finger tack" or "surface tack").
This effect however may not necessarily be related blocking.
3.4
stable mass
mass achieved when the difference between two subsequent weightings within 24 h does not exceed 0,2 %
[Source: EN 927-5:2006]
3.5
stackability
resistance to damage due to unwanted adhesion between adjacent surfaces of articles that develops when
these articles are left in contact
[Source: EN ISO 9117-2:2010]
4 Principle
The coating material or the coating system under test has to be applied on test panels or cut stripes under
specified conditions. After specified drying time and under specified climatic conditions, the two test panels or
cut stripes are placed crosswise in contact with each other. This assembly is subsequently placed in a test
apparatus to be subjected to a specified pressure load under specified climatic conditions. After a specified
period of time, the load is removed and the test panels manually separated under specific climatic conditions
and the contact areas examined for any damage to the coating in the area of contact.
5 Apparatus
5.1 Weights
Of a mass which correspondents to the requirements of 12.1.
5.2 Oven or conditioning room
Depending on the selected climatic conditions during load (see clause 11 or 12.2): Oven of appropriate size,
controlled at a temperature of (50 ± 2) °C or (60 ± 2) °C. Climatic conditioning chamber where the selected
climatic conditions can be achieved.
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5.3 Application on Specimen s3 - inert substrate
1)
Test panels ("strips") made of polyvinyl chloride film free of migrating plasticizers, of sufficient rigidity to
ensure a flat surface, impervious to and unaffected by water or aliphatic organic solvents and of nominal
thickness 0,25 mm. Other types of plastic film may be used where the coating contains solvents which may
adversely affect the PVC film. If the coating delaminates from the substrate before or during the test, another,
more suitable substrate should be used.
Film applicator, preferably automatic, used at an application speed of 10 mm/s to 15 mm/s and fitted with a
doctor blade (see 8.2) with an appropriate gap clearance and a gap width of at least 60 mm.
Cutting knife, metal template or straight-edge ruler to cut the foils.
5.4 Application on test specimen s1, s2, s4
Application tools (e. g. roller, brush, spray equipment) depending on the paint manufacturer's specification.
6 Sampling
A representative sample of the product to be tested (or of each product in the case of a multi-coat system),
should be taken in accordance with EN ISO 15528. Examine and prepare each sample for testing in
accordance with EN ISO 1513.
7 Test panels – substrate – test specimen
7.1 General
Depending on the specimens provided for use, a different type of application method may be required.
1) Suitable test foil made of plasticised PVC is available from Leneta Co. Whitney Road, Mahawa, NJ 07430-3129, USA, or Erichsen
GmbH, Am Iserbach 14, D-58675 Hemer, Germany, or Sheen Instruments, Unit 4, St George’s Industrial Estate, Richmond Road,
Kingston, Surrey KT2 5BQ, United Kingdom. This information is given for the convenience of users of the document and does not
constitute an endorsement by CEN of the product named.
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Table 1 — Substrate
Substrate (s) Type Description Recommended use
standard test method to
spruce (picea abies)
s1 wood check a coating system
(see 7.1)
or a individual top coat.
individual wood species
on customer-specific
any wood species requirement (e.g. coated
s2 other wood substrates
(see 7.2) test specimen from
which test panels can be
cut)
lab test method to
compare different top
coats (simulation of the
s3 inert substrate PVC-foil (see 5.3)
blocking behaviour on
not absorbing
substrates)
lab test method to
e. g. plywood according compare different
s4 other plane substrates
to EN 636-3 coating materials or
coating systems.
7.2 Substrate s1 – Spruce
The wood shall be spruce (picea abies) that has been selected to be free from knots and cracks, to be
straight-grained and of normal growth rate (i. e. between 3 and 8 annual rings per 10 mm).
The panels shall be planed all round to a smooth and uniform finish. The inclination of the growth rings to the
test face shall be (45 ± 10) °. See Figure 1. The wood shall be free from blue stain and evidence of surface or
bulk infection. Abnormal porosity shall be avoided. Condition the wood prior to conversion into test panels in
accordance with EN 23270 at (23 ± 2) °C and a relative humidity of (50 ± 5) %. The density of the wood shall
3 3
be between 0,4 g/cm and 0,5 g/cm when measured at an equilibrium moisture content at standard climate
in accordance with EN 23270 at (23 ± 2) °C and a relative humidity of (50 ± 5) %.
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Figure 1
Key
1 Front of panel (test face)
a Min. 3, max. 8 growth rings per 10mm (applies for the whole panel)
α Angle of growth rings to test face min. 35°, max. 55°
Figure 2 — Selection of wood
7.3 Substrate s2 – Other wood species
In case of customer-specific requirements or if it might be assumed that other types of wood might give a
different result an alternative wood species should be used as substrate. It is also an option for manufacturers
to provide an already coated test specimen from which test panels can be cut. The chosen panel shall be
precisely described in the test report. The surface of the specimens provided shall be plane. The test
substrate shall be conditioned until constant mass at standard conditions according to EN 23270 [(23 ± 2) °C
and (50 ± 5) % relative humidity].
7.4 Substrate s3 – Inert substrate
See paragraph 5.3.
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7.5 Substrate s4 – Other plane substrates
The selected substrate should be precisely described in the test report. Alternatives that can be used include
absorbing substrates (e. g. plywood) as well as non absorbing substrates (e. g. glass, aluminium, coated
paper, polymer panels). Absorbing substrates should be conditioned until achieving constant mass at
standard conditions according to EN 23270 [(23 ± 2) °C and (50 ± 5) % relative humidity].
8 Application of the test specimens
8.1 General
Depending on the specimens provided for use, a different type of application may be required (See Table 2).
Table 2 – Type of application
recommended
Substrate (s) Type Description
application
According to
spruce (Picea abies)
s1 wood manufacturer's
(see 7.1)
specification
According to
manufacturer's
specification or
any wood species customer's specification
s2 other wood species
(see 7.2) Optional use of already
coated test specimen
from which test panels
can be cut.
application of the top
coat to be investigated in
a dry film thickness
s3 inert substrate PVC-foil (see 5.3)
related to practice, by
means of a film
applicator
According to
manufacturer's
specification, customer's
specification or by
e. g. plywood according application of the top
s4 other plane substrates
to EN 636-3 coat to be investigated in
a dry film thickness
related to practice, by
means of a film
applicator
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8.2 Application to substrate s1 – spruce, s2 – other wood substrates, or substrate s4 - other
plane substrates
If nothing else is specified by the manufacturer of the coating system, the conditioned, planed wood
specimens (test panels), shall be manually sanded with abrasive paper (180 grade) just before application.
Dust must be removed completely. The test panels are coated with the coating system to be tested, closely
following manufacturer's instructions or specification. Examples of possible suitable application methods and
their specification are given in Annex B.
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates
Use an automatic film applicator fitted with a doctor blade with an appropriate gap clearance and gap width
(somewhat wider than the intended final width). Make a draw-down of the prepared sample of coating material
on the test panel to achieve a uniform even film at least 10 mm longer than the intended final test surface.
Apply the coating material under test on the mat
...
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