SIST EN 927-10:2019
(Main)Paints and varnishes - Coating materials and coating systems for exterior wood - Part 10: Resistance to blocking of paints and varnishes on wood
Paints and varnishes - Coating materials and coating systems for exterior wood - Part 10: Resistance to blocking of paints and varnishes on wood
This European Standard 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 influence the behaviour of wood coatings are more specific.
NOTE In some countries, the test is called a "block or blocking resistance" test.
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Bestimmung der Blockfestigkeit
Diese Europäische Norm 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 Norme européenne 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 - 10. del: Odpornost filmov premazov proti medsebojnemu zlepljanju
Ta evropski standard določa metodo preskusa za določanje, pri standardnih pogojih, ali se enojni film ali večplastni sistem barv in lakov za les po določenem času sušenja dovolj posušijo, da se lahko izognemo škodi, ko sta dve pobarvani ploskvi ali ena pobarvana ploskev in druga ploskev v stiku pod tlakom in naknadno ločeni. Ta metoda je namenjena simulaciji pogojev, ko so pobarvani izdelki v stiku drug z drugim. V primerjavi s standardom EN ISO 9117 2 sta priprava in podatki, ki vplivajo na vedenje premazov za les, bolj specifični.
OPOMBA: V nekaterih državah se preskus imenuje preskus »odpornosti proti zlepljenju«.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 927-10:2019
01-julij-2019
Nadomešča:
SIST-TS CEN/TS 16499:2014
Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 10.
del: Odpornost filmov premazov proti medsebojnemu zlepljanju
Paints and varnishes - Coating materials and coating systems for exterior wood - Part
10: 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: EN 927-10:2019
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
SIST EN 927-10:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 927-10:2019
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SIST EN 927-10:2019
EN 927-10
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 87.040 Supersedes CEN/TS 16499:2013
English Version
Paints and varnishes - Coating materials and coating
systems for exterior wood - Part 10: Resistance to blocking
of paints and varnishes on wood
Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und
de peinture pour le bois en extérieur - Partie 10 : Beschichtungssysteme für Holz im Außenbereich - Teil
Résistance au blocage des peintures et vernis sur bois 10: Bestimmung der Blockfestigkeit von
Beschichtungsstoffen und Beschichtungssystemen für
Holz
This European Standard was approved by CEN on 16 December 2018.
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, 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-10:2019 E
worldwide for CEN national Members.
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EN 927-10:2019 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Apparatus . 6
6 Sampling . 7
7 Substrates . 7
7.1 General . 7
7.2 Substrate s1 – Spruce . 7
7.3 Substrate s2 – Other wood species . 8
7.4 Substrate s3 – Inert substrate . 8
7.5 Substrate s4 – Other plane substrates . 8
8 Application . 9
8.1 General . 9
8.2 Application to substrate s1 – spruce, s2 – other wood substrates, or substrate s4 -
other plane substrates . 9
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates . 10
8.4 Typical dry film thickness on stable wood constructions . 10
9 Drying time . 10
10 Preparation of test strips and specimen . 10
10.1 General . 10
10.2 Determination of the dry film thickness . 11
11 Conditioning of test strips . 11
12 Application of load . 11
12.1 General . 11
12.2 Load to be applied . 12
12.3 Climatic conditions during loading . 13
13 Evaluation . 14
14 Precision . 15
15 Test report . 15
Annex A (normative) Necessary additional information . 16
Annex B (informative) Suggested form for specifying application parameters . 17
B.1 General . 17
B.2 Specifying complete coating systems . 17
B.3 Equipment . 17
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B.4 Process . 17
B.5 Spreading rate. 17
B.6 Flash-off . 17
B.7 Drying and curing . 18
B.8 Overcoating intervals . 18
B.9 Sanding . 18
B.10 Examples for specifying application parameters. 18
Bibliography . 22
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EN 927-10:2019 (E)
European foreword
This document (EN 927-10:2019) has been prepared by Technical Committee CEN/TC 139 “Paints and
varnishes”, the secretariat of which is held by DIN.
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 November 2019, and conflicting national standards
shall be withdrawn at the latest by November 2019.
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 16499:2013.
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, 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.
4
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SIST EN 927-10:2019
EN 927-10:2019 (E)
1 Scope
This document specifies a test method for determining, under specified optional 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 influence 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 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 927-1, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 1:
Classification and selection
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)
ISO 554, Standard atmospheres for conditioning and/or testing - Specifications
3 Terms and definitions
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 http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
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
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.
[SOURCE: EN ISO 4618:2014, 2.30, modified – added Notes to entry.]
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3.2
load
mass needed to achieve a suitable test pressure
Note 1 to entry: High temperature and humidity increase the stress 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
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.
[SOURCE: EN ISO 4618:2014, 2.10, modified – added Note 1 to entry.]
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 12.2.
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 Tools for application on test specimen s1, s2, s4, (e.g. roller, brush, spray equipment)
depending on the paint manufacturer's specification.
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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 Substrates
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
Spruce (Picea abies) to check a coating
s1 Wood
(see 7.2) system or an individual
top coat
Individual wood
species on customer-
Any wood species specific requirement
s2 Other wood substrates
(see 7.3) (e.g. a 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
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 ISO 554 at (20 ± 2) °C and a relative humidity of (65 ± 5) %. The
density of the wood shall be between 0,4 g/cm3 and 0,5 g/cm3 when measured at an equilibrium
moisture content at standard climate in accordance with ISO 554 at (20 ± 2) °C and a relative humidity
of (65 ± 5) %.
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EN 927-10:2019 (E)
Key
1 front of panel (test face)
a min. 3, max. 8 growth rings per 10 mm (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 ISO 554 [(20 ± 2) °C and (65 ± 5) % relative humidity].
7.4 Substrate s3 – Inert substrate
7.4.1 Test panels (“strips”) made of polyvinyl chloride (PVC) 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 plastics film might be used where the coating
material contains solvents which can adversely affect the PVC film. If the coating delaminates from the
substrate before or during the test, another, more suitable substrate should be used.
NOTE PVC foils can have different properties on the two sides, only one of the sides being intended for
coating.
7.4.2 Film applicator, preferably automatic, used at an application speed of 10 mm/s to 15 mm/s and
fitted with a doctor blade (see 8.3) with an appropriate gap clearance and a gap width of at least 60 mm.
7.4.3 Use cutting knife, metal template or straight-edge ruler to cut the foils.
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].
8
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8 Application
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 7.2) manufacturer's
specification
s2 Other wood species Any wood species According to
(see 7.3) manufacturer's
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
to EN 636 manufacturer's
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.
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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 (at least 60 mm). 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 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 dry film thickness on stable wood constructions
Coating systems should be applied according to the manufacturer's instructions. For reference, the dry
film thicknesses below refer to first factory-applied coating systems on bare wood.
1)
— Spray applied coating systems:
Coating thickness > 80 µm for high build opaque, transparent and semi-transparent wood coating
systems (according to EN 927-1).
Coating thickness > 100 µm for opaque coating systems.
1)
— Brush applied coating systems:
Coating thickness approximately 30 µm to 50 µm for medium to high build opaque, transparent and
semi-transparent wood coating systems (according to EN 927-1).
Coating thickness approximately 60 µm to 100 µm for opaque coating systems.
EXAMPLE Gap clearance of a doctor blade: 400 µm for spray coating systems and 200 µm to 300 µm for
brush coating systems.
In each case, a uniform smooth film is necessary.
9 Drying time
Drying and/or curing of each coated test panel should correspond to the manufacturer's specifications.
Select the climatic conditions during drying and the proposed drying method according to the
manufacturers' specifications. If nothing else is agreed, the top coat should be dried for 24 h at standard
conditions according to ISO 554 [(20 ± 2) °C and (65 ± 5) % relative humidity].
10 Preparation of test strips and specimen
10.1 General
When the top coat has dried (see Clause 9), at least 6 test strips of the same type should be cut from the
coated specimens (test panels) with a width of 20 mm to 50 mm and a length of not less than twice the
width. When cutting the test strips, the surface to be tested shall not be damaged. Particular attention
should be paid to the edges of the test strips. Burrs should be avoided. Other formats of the test strips
may be used, but shall be indicated in the test report. After cutting the panels, the resulting test strips
should be conditioned immediately.
1) Refers to a complete coating system.
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10.2 Determination of the dry film thickness
The end sections of the test strips, i.e. the part of the strip or panel that has not been stacked towards
another sample should be used for determination of the dry film thickness of the coating according to
EN ISO 2808. The measurement of the dry film thickness should be made after the blocking test
procedure. The selected measurement method and the resulting film thickness shall be stated in the test
report.
NOTE On wood, the dry film thickness of the coating on the wood surface is measured. Many coating
substances can penetrate into the wood to a certain degree, but this part is not included in the determination
11 Conditioning of test strips
Conditioning of test strips has to be carried out according to Table 3.
Table 3 — Conditioning of test strips
Conditioning
Conditioning,
Description
classification
Temperature Relative humidity
no conditioning; initial loading to start
Early resistance to
c0 immediately after the manufacturer’s prescribed
blocking
drying time
24 h (standard
c1 (23 ± 2) °C (50 ± 5) %
conditioning)
120 h
c2 (23 ± 2) °C (50 ± 5) %
(final resistance to
blocking)
24 h (resistance to
blocking at high (23 ± 2) °C (50 ± 5) %
humidity)
a
c3
followed by:
120 h (23 ± 2) °C (98 ± 2) %
a
Conditioning procedure c3 is normally not applicable on substrate s3.
12 Application of load
12.1 General
After conditioning, put two test strips each of the same type on top of each other, offset by (90 ± 2)°, so
that the surfaces to be tested are in contact. The test strips shall be arranged so that they are resting
evenly on each other and the length of the test panel shall be no less than twice the width (see Figure 2).
For a triple determination, three pairs of specimens may so be loaded at the same time. When using of
test strips made of wood (substrate s1, s2 or s4) the use of a rack or holder to stabilize the strips is
recommended (example see Figure 3).
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EN 927-10:2019 (E)
Key
l width of the square of the overlapping test pieces in contact (see 12.2)
Figure 2 —Typical arrangement of the test specimens
Figure 3 — Example of a holder to load the specimens
When using foils or other thin and/or flexible substrates (substrate s3 or s4) as test strips, these may be
placed between two plane surfaces (e.g. glass panels) for stabilization, prior to load. The dimensions of
the plane panels for stabilization should correspond to and align with the test strips.
Subsequently the agreed weights (see 12.2) are carefully placed on the test specimens and the assembly
exposed to the specified test climate for the required period of time.
12.2 Load to be applied
The mass of the applied weights should be selected as a function of the loaded surface, to achieve the
desired pressure p (see Table 4) on the test surface (see Table 5).
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EN 927-10:2019 (E)
Table 4 —Load be applied during test
Pressure
kPa
p 10
1
p 28
2
p by agreement
3
If required, pressure p, in kilopascals, to the coated test strips can be calculated according to
Formula (1):
m ++m m m
12 12
pg⋅≈ ⋅ 10 (1)
22
ll
where
p is pressure, in kilopascals;
m is mass of panels possibly supported for stabilization, in grams;
1
When using multiple stacks of panels, the increasing pressure down the stack shall be taken into
consideration.
m is mass of applied weight pieces, in grams;
2
l is the width, in millimetres, of the square of the overlapping test pieces in contact (see Figure 2);
g is the acceleration of free gravity, in newtons per kilogram (approximately 10 N/kg).
Table 5 — Dimensions of specimen
Classification Pressure Width Contact surface Total mass (m + m )
1 2
2
kPa mm mm kg
20 400 0,4
p1 10
50 2 500 2,5
20 400 1,1
p2 28
50 2 500 7,0
3
NOTE The required pressure p1 (10 kPa) was calculated considering wood density (around 400 kg/m to
3
600 kg/m ) and a maximum of up to 2 m high stacks, e.g. of window frames. Pressure p2 (28 kPa) is intended to
take into account a worst case scenario on site.
12.3 Climatic conditions during loading
After the coated test strips have been loaded wit
...
SLOVENSKI STANDARD
oSIST prEN 927-10:2017
01-november-2017
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Paints and varnishes - Coating materials and coating systems for exterior wood - Part
10: 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: prEN 927-10
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
oSIST prEN 927-10:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 927-10:2017
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oSIST prEN 927-10:2017
DRAFT
EUROPEAN STANDARD
prEN 927-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2017
ICS 87.040 Will supersede CEN/TS 16499:2013
English Version
Paints and varnishes - Coating materials and coating
systems for exterior wood - Part 10: Resistance to blocking
of paints and varnishes on wood
Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und
de peinture pour le bois en extérieur - Résistance au Beschichtungssysteme für Holz im Außenbereich -
blocage des peintures et vernis sur bois Bestimmung der Blockfestigkeit
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 139.
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, 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.
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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 927-10:2017 E
worldwide for CEN national Members.
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Contents Page
European 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 specimens . 7
7.1 General . 7
7.2 Substrate s1 – Spruce . 8
7.3 Substrate s2 – Other wood species . 8
7.4 Substrate s3 – Inert substrate . 8
7.5 Substrate s4 – Other plane substrates . 8
8 Application to the test specimens . 9
8.1 General . 9
8.2 Application to substrate s1 – spruce, s2 – other wood substrates, or substrate s4 -
other plane substrates . 9
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates . 10
8.4 Typical dry film thickness on stable wood constructions . 10
9 Drying time . 10
10 Preparation of test strips and specimen . 10
10.1 General . 10
10.2 Determination of the dry film thickness . 11
11 Conditioning of test strips . 11
12 Application of load . 11
12.1 General . 11
12.2 Load to be applied . 12
12.3 Climatic conditions during loading. 13
13 Evaluation . 14
14 Precision . 15
15 Test report . 15
Annex A (normative) Necessary additional information . 16
Annex B (informative) Suggested form for specifying application parameters . 17
B.1 General . 17
B.2 Specifying complete coating systems . 17
B.3 Equipment . 17
B.4 Process . 17
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B.5 Spreading rate. 17
B.6 Flash-off . 18
B.7 Drying and curing . 18
B.8 Overcoating intervals . 18
B.9 Sanding . 18
B.10 Examples for specifying application parameters. 18
Bibliography . 22
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European foreword
This document (prEN 927-10:2017) 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 CEN Enquiry.
This document will supersede CEN/TS 16499:2013.
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1 Scope
This European Standard 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 influence 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 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 927-1, 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.
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
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
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.
[SOURCE: EN ISO 4618:2014, 2.30, modified – added Notes to entry.]
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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 should also be taken into account.
3.3
after tack
property of a film to remain sticky after normal drying or curing
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.
[SOURCE: EN ISO 4618:2014, 2.10, modified – added Note 1 to entry.]
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.
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 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.
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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
Spruce (Picea abies) to check a coating
s1 Wood
(see 7.1) system or an individual
top coat.
Individual wood
species on customer-
Any wood species specific requirement
s2 Other wood substrates
(see 7.2) (e.g. a 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.
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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
3 3
density of the wood shall 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
1 front of panel (test face)
a min. 3, max. 8 growth rings per 10 mm (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].
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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
(see 7.2) manufacturer's
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
to EN 636 manufacturer's
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.
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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 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 dry film thickness on stable wood constructions
The dry film thicknesses below refer to Original Equipment Manufacturer (OEM) coating systems.
1)
Spray applied coating systems:
Coating thickness > 80 µm for high build opaque, transparent and semi-transparent wood coating
systems (according to EN 927-1).
Coating thickness > 100 µm for opaque coating systems.
1)
Brush applied coating systems:
Coating thickness approximately 30 µm to 50 µm for medium to high build opaque, transparent and
semi-transparent wood coating systems (according to EN 927-1).
Coating thickness approximately 60 µm to 100 µm for opaque coating systems.
EXAMPLE Gap clearance of a doctor blade: 400 µm for spray coating systems and 200 µm to 300 µm for
brush coating systems.
In each case, a uniform smooth film is necessary.
9 Drying time
Drying and/or curing of each coated test panel should correspond to the manufacturer's specifications.
Select the climatic conditions during drying and the proposed drying method according to the
manufacturers' specifications. If nothing else is agreed, the top coat should be dried for 24 h at standard
conditions according to EN 23270 [(23 ± 2) °C and (50 ± 5) % relative humidity].
10 Preparation of test strips and specimen
10.1 General
When the top coat has dried (see Clause 9), at least 6 test strips of the same type should be cut from the
coated specimens (test panels) with a width of 20 mm to 50 mm and a length of not less than twice the
width. When cutting the test strips, the surface to be tested shall not be damaged. Particular attention
should be paid to the edges of the test strips. Burrs should be avoided. Other formats of the test strips
may be used, but shall be indicated in the test report. After cutting the panels, the resulting test strips
should be conditioned immediately.
1) Refers to a complete coating system.
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10.2 Determination of the dry film thickness
The end sections of the test strips, i.e. the part of the strip or panel that has not been stacked towards
another sample should be used for determination of the dry film thickness of the coating according to
EN ISO 2808. The measurement of the dry film thickness should be made after the blocking test
procedure. The selected measurement method and the resulting film thickness shall be stated in the test
report.
NOTE On wood, the dry film thickness of the coating on the wood surface is measured. Many coating
substances can penetrate into the wood to a certain degree, but this part is not included in the determination
11 Conditioning of test strips
Conditioning of test strips has to be carried out according to Table 3.
Table 3 — Conditioning of test strips
Conditioning
Conditioning,
Description
classification
Temperature Relative humidity
no conditioning; initial loading to start
Early resistance to
c0 immediately after the manufacturer’s prescribed
blocking
drying time
24 hours (standard
c1 (23 ± 2) °C (50 ± 5) %
conditioning)
120 hours
c2 (23 ± 2) °C (50 ± 5) %
(final resistance to
blocking)
24 hours (resistance to
blocking at high (23 ± 2) °C (50 ± 5) %
humidity)
a
c3
followed by:
120 hours (23 ± 2) °C (98 ± 2) %
a
Conditioning procedure c3 is normally not applicable on substrate s3.
12 Application of load
12.1 General
After conditioning, put two test strips each of the same type on top of each other, offset by (90 ± 2)°, so
that the surfaces to be tested are in contact. The test strips shall be arranged so that they are resting
evenly on each other and the length of the test panel shall be no less than twice the width (see Figure 2).
For a triple determination, three pairs of specimens may so be loaded at the same time. When using of
test strips made of wood (substrate s1, s2 or s4) the use of a rack or holder to stabilise the strips is
recommended (example see Figure 3).
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Key
l width of the square of the overlapping test pieces in contact (see 12.2)
Figure 2 —Typical arrangement of the test specimens
Figure 3 — Example of a holder to load the specimens
When using foils or other thin and/or flexible substrates (substrate s3 or s4) as test strips, these may be
placed between two plane surfaces (e.g. glass panels) for stabilisation, prior to load. The dimensions of
the plane panels for stabilisation should correspond to and align with the test strips.
Subsequently the agreed weights are carefully placed on the test specimens and the assembly exposed
to the specified test climate for the required period of time.
12.2 Load to be applied
The mass of the applied weights should be selected as a function of the loaded surface, to achieve the
desired pressure p (see Table 4) on the test surface (see Table 5).
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Table 4 —Load be applied during test
Pressure
Pa
p 10 000
1
p 28 000
2
p by agreement
3
If required, pressure p, in pascals, to the coated test strips may be calculated according to Formula (1):
m ++m m m
12 3 12 4
(1)
pg⋅⋅ 10≈ ⋅ 10
2 2
ll
where
p pressure, in pascals;
2)
m mass of panels possibly supported for stabilization, in grams ;
1
m mass of applied weight pieces, in grams;
2
l is the width, in millimetres, of the square of the overlapping test pieces in contact (see Figure 2);
g is the acceleration of free gravity, in newtons per kilogram (approximately 10 N/kg).
Table 5 — Dimensions of specimen
Classification Pressure Width Contact surface Total mass (m + m )
1 2
2
Pa mm mm kg
20 400 0,4
p1 10 000
50 2 500 2,5
20 400 1,12
p2 28 000
50 2 500 7,0
3
NOTE The required pressure p1 (10 000 Pa) was calculated considering wood density (around 400 kg/m to
3
600 kg/m ) and a maximum of up to 2 m high stacks, e.g. of window frames. Pressure p (28 000 Pa) is in line with
2
some already existing national standards and guidance papers, which takes a worst case scenario on site into
account.
12.3 Climatic conditions during loading
After the coated test strips have been loaded with a pressure p or p , the test strips are exposed to the
1 2
agreed climatic conditions according to Table 6.
2) When using multiple stacks of panels, the increasing pressure down the stack may be taken into consideration.
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Table 6 — Climatic conditions during loading
Time period Temperature T Relative humidity
Climatic condition
h °C %
t1 24 (23 ± 2) (50 ± 5)
t2 24 (50 ± 2) –
t3 24 (60 ± 2) –
24 (23 ± 2) (50 ± 5)
a
t4 followed by
120 (23 ± 2) (98 ± 2)
a
Climatic condition t4 usually is not applicable on substrate s3 – inert substrate.
At the end of the selected time period and climatic condi
...
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