EN ISO 16862:2006

Paints and varnishes - Evaluation of sag resistance (ISO 16862:2003)

ISO 16862:2003 describes test methods for evaluating the sag resistance (resistance to sagging) of paints, varnishes and similar coating materials (coatings) when applied to a substrate and held in a vertical position.
Evaluation of the sag resistance can be carried out after the coating has been applied as follows:
using a sag index applicator on a horizontally placed test panel which is afterwards put into a vertical position orusing a spray gun for application on a substrate in a vertical position.
This International Standard is applicable to liquid coatings only.

Beschichtungsstoffe - Bewertung der Widerstandsfähigkeit gegen Ablaufen (ISO 16862:2003)

Diese Internationale Norm legt ein Prüfverfahren zum Bewerten der Widerstandsfähigkeit gegen Ablaufen von
Beschichtungsstoffen (Beschichtungen) fest, wenn diese auf ein Substrat aufgetragen sind, das senkrecht
gehalten wird.
Die Widerstandsfähigkeit gegen Ablaufen kann bewertet werden, wenn die Beschichtung wie folgt
aufgetragen wurde:
a) mit einer gestuften Filmzieh-Rakel auf einer waagerecht liegenden Probenplatte, die danach in eine
senkrechte Lage gebracht wird, oder
b) mit einer Spritzpistole auf einem Substrat in senkrechter Lage.
ANMERKUNG Es kann auch mit einem Pinsel oder einer Rolle aufgetragen werden, vorausgesetzt, dass eine
gleichmäßige Beschichtung erhalten wird.
Diese Internationale Norm ist nur für flüssige Beschichtungen anwendbar.

Peintures et vernis - Evaluation de la résistance à la formation de festons (ISO 16862:2003)

L'ISO 16862:2003 décrit les méthodes d'essai permettant d'évaluer la résistance à la formation de festons des peintures, des vernis et des produits similaires (revêtements) appliqués sur un subjectile maintenu en position verticale.
L'évaluation de la résistance à la formation de festons peut être effectuée après application du revêtement, comme suit:
à l'aide d'un applicateur à indice de festons sur un panneau d'essai placé à l'horizontale, puis à la verticale ouà l'aide d'un pulvérisateur pour application sur un subjectile en position verticale.
La présente Norme internationale s'applique seulement aux revêtements liquides.

Barve in laki - Vrednotenje odpornosti proti stekanju (ISO 16862:2003)

General Information

• Status: Published
• Publication Date: 09-May-2006
• Withdrawal Date: 29-Nov-2006
• ICS: 87.040 - Paints and varnishes
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-May-2006
• Due Date: 12-Sep-2006
• Completion Date: 10-May-2006
• Ref Project: SIST EN ISO 16862:2006 - Paints and varnishes - Evaluation of sag resistance (ISO 16862:2003)

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2006
Barve in laki - Vrednotenje odpornosti proti stekanju (ISO 16862:2003)
Paints and varnishes - Evaluation of sag resistance (ISO 16862:2003)
Beschichtungsstoffe - Bewertung der Widerstandsfähigkeit gegen Ablaufen (ISO
16862:2003)
Peintures et vernis - Evaluation de la résistance a la formation de festons (ISO
16862:2003)
Ta slovenski standard je istoveten z: EN ISO 16862:2006
ICS:
87.040
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 16862
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2006
ICS 87.040
English Version
Paints and varnishes - Evaluation of sag resistance (ISO
16862:2003)
Peintures et vernis - Evaluation de la résistance à la Beschichtungsstoffe - Bewertung der Widerstandsfähigkeit
formation de festons (ISO 16862:2003) gegen Ablaufen (ISO 16862:2003)
This European Standard was approved by CEN on 27 April 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16862:2006: E
worldwide for CEN national Members.

Foreword
The text of ISO 16862:2003 has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes” of the International Organization for Standardization (ISO) and has been taken over
as EN ISO 16862:2006 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 2006, and conflicting national
standards shall be withdrawn at the latest by November 2006.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 16862:2003 has been approved by CEN as EN ISO 16862:2006 without any
modifications.
INTERNATIONAL ISO
STANDARD 16862
First edition
2003-11-15
Paints and varnishes — Evaluation of sag
resistance
Peintures et vernis — Évaluation de la résistance à la formation de
festons
Reference number
ISO 16862:2003(E)
©
ISO 2003
ISO 16862:2003(E)
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©
ii ISO 2003 – All rights reserved

ISO 16862:2003(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Apparatus . 2
5 Sampling . 2
6 Test panels . 2
7 Procedure . 2
8 Expression of results . 5
9 Precision . 6
10 Test report . 6
Annex A (normative) Sag index applicator blades . 7
Bibliography . 9
©
ISO 2003 – All rights reserved iii

ISO 16862:2003(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16862 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
©
iv ISO 2003 – All rights reserved

ISO 16862:2003(E)
Introduction
When a wet coat of paint is applied to an inclined surface, the coat will flow down the surface under its own
weight with cohesive forces opposing this flow. The balance of rheological and gravitational forces will allow a
certain wet-film thickness to be applied without this unwanted flow becoming objectionable. Flow down an
inclined surface is normally unstable, particularly if the coat is of uneven thickness, and it is this instability that
leads to unsightly sags and tears. For a vertical surface, the gravitational force per unit area of surface, i.e. the
stress, is given by h×d×gh, where is the film thickness in micrometres, d is the density of the coat of paint
in kilograms per cubic metre and g is the gravitational constant in metres per second squared. The cohesive
force per unit area of the surface is given by V × dν/dlV, where is the Newtonian viscosity in pascal seconds
and dν/dl is the shear rate in reciprocal seconds. This International Standard describes two methods for
determining the maximum wet-film thickness of a coating which can be applied to a vertical surface without
giving rise to sagging or similar phenomena. The first method is carried out on a small scale using sag index
applicators and the second is a larger-scale, practical test.
©
ISO 2003 – All rights reserved v

.
vi
INTERNATIONAL STANDARD ISO 16862:2003(E)
Paints and varnishes — Evaluation of sag resistance
1Scope
This International Standard describes test methods for evaluating the sag resistance (resistance to sagging) of
paints, varnishes and similar coating materials (coatings) when applied to a substrate and held in a vertical
position.
Evaluation of the sag resistance can be carried out after the coating has been applied as follows:
a) using a sag index applicator on a horizontally placed test panel which is afterwards put into a vertical
position,
or
b) using a spray gun for application on a substrate in a vertical position.
NOTE Brush or roller application can also be used provided that an even coating is applied.
This International Standard is applicable to liquid coatings only.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 1513, Paints and varnishes — Examination and preparation of samples for testing
ISO 1514, Paints and varnishes — Standard panels for testing
ISO 1517, Paints and varnishes — Surface-drying test — Ballotini method
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 2884-1, Paints and varnishes — Determination of viscosity using rotary viscometers — Part 1: Cone-and-
plate viscometer operated at a high rate of shear
ISO 2884-2, Paints and varnishes — Determination of viscosity using rotary viscometers — Part 2: Disc or ball
viscometer operated at a specified speed
ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning and
testing
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
©
ISO 2003 – All rights reserved 1

ISO 16862:2003(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sag resistance
greatest wet-film thickness, in micrometres, of a coating, under specified conditions of application, for a
specified substrate and under specified environmental conditions, for which the coating will not have a tendency
to flow during the drying process when placed in an inclined position
NOTE 1 This flow is known as sagging.
NOTE 2 Surface appearances typical of sagging are generally characterized by runs, tear drops, curtains or sags.
4 Apparatus
4.1 Sag index applicator, with gaps of defined clearance as given in Annex A, for applying film stripes of
appropriate thickness. Examples of sag index applicators are given in Annex A.
4.2 Spraying device, airless or air-assisted, for applying the coating.
4.3 Wet-film thickness gauge, with an appropriate range.
4.4 Stirrer.
5 Sampling
Take a representative sample of the product to be tested, as described in ISO 15528, and prepare the sample
for testing, as described in ISO 1513.
6 Test panels
Use standard panels prepared in accordance with ISO 1514.
NOTE For the sag index applicator method, glass panels should preferably be used to provide a flat surface over which the
applicator will lay down stripes of coating of even thickness. A sag index applicator will not run consistently over a curved
substrate.
7 Procedure
7.1 Test conditions
Unless otherwise stipulated or agreed, carry out the test under standard conditions, i.e. a temperature of
◦
(23 ± 2) C and a relative humidity of (50 ± 5) % in accordance with ISO 3270.
The film thickness of a coating material at which sag does not occur when applied in accordance with 7.2.3 and
7.3.3 might differ. The values obtained by these methods are dependent on shear-rate at application, and the
temperature. Moisture-cure and water-thinnable coating materials are particularly influenced by the relative
humidity. The sagging tendency of two-component coatings is additionally influenced by the period between
mixing the components and application.
©
2 ISO 2003 – All rights reserved

ISO 16862:2003(E)
7.2 Using a sag index applicator
7.2.1 Principle
Two test panels are coated with the material under test and the sag index applicator is drawn across the panels.
The panels are placed vertically and the thickest stripe which shows no sign of sagging is noted on each panel.
The actual wet-film thickness of each stripe is measured on a third panel.
7.2.2 General
A pre-shear programme is
...