EN 927-10:2019

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

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.

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
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

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.
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.]
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.
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) %.
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 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.
8.3 Application to substrate s3 – inert substrate or substrate s4 - other plane substrates
Use an automatic film applicator fitted with a d
...