SIST EN ISO 7253:2002
(Main)Paints and varnishes - Determination of resistance to neutral salt spray (fog) (ISO 7253:1996)
Paints and varnishes - Determination of resistance to neutral salt spray (fog) (ISO 7253:1996)
The standard specifies a method for determining the resistance of coatings to neutral salt spray (fog) in accordance with the requirements of coating or product specifications.
Beschichtungsstoffe - Bestimmung der Beständigkeit gegen neutralen Salzsprühnebel (ISO 7253:1996)
Diese Internationale Norm gehört zu einer Reihe von Normen, welche die Probenahme und die Prüfung von Beschichtungsstoffen behandelt.
Diese Norm beschreibt ein Verfahren zum Bestimmen der Beständigkeit von Beschichtungen gegen neutralen Salzsprühnebel, wenn entsprechende Anforderungen an die Beschichtung gestellt werden bzw. Produkt-spezifikationen vorliegen.
Peintures et vernis - Détermination de la résistance au brouillard salin neutre (ISO 7253:1996)
Barve in laki - Določanje obstojnosti na nevtralno slano meglico (ISO 7253:1996)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 7253:2002
01-junij-2002
%DUYHLQODNL'RORþDQMHREVWRMQRVWLQDQHYWUDOQRVODQRPHJOLFR ,62
Paints and varnishes - Determination of resistance to neutral salt spray (fog) (ISO
7253:1996)
Beschichtungsstoffe - Bestimmung der Beständigkeit gegen neutralen Salzsprühnebel
(ISO 7253:1996)
Peintures et vernis - Détermination de la résistance au brouillard salin neutre (ISO
7253:1996)
Ta slovenski standard je istoveten z: EN ISO 7253:2001
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 7253:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 7253:2002
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SIST EN ISO 7253:2002
EUROPEAN STANDARD
EN ISO 7253
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2001
ICS 87.040
English version
Paints and varnishes - Determination of resistance to neutral
salt spray (fog) (ISO 7253:1996)
Peintures et vernis - Détermination de la résistance au Beschichtungsstoffe - Bestimmung der Beständigkeit
brouillard salin neutre (ISO 7253:1996) gegen neutralen Salzsprühnebel (ISO 7253:1996)
This European Standard was approved by CEN on 29 June 2001.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7253:2001 E
worldwide for CEN national Members.
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SIST EN ISO 7253:2002
EN ISO 7253:2001 (E)
CORRECTED 2002-02-06
Foreword
The text of the International Standard from Technical Committee ISO/TC 35 "Paints and
varnishes" of the International Organization for Standardization (ISO) has been taken over as a
European Standard 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 February 2002, and conflicting national
standards shall be withdrawn at the latest by February 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of the International Standard ISO 7253:1996 has been approved by CEN as a
European Standard without any modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).
2
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SIST EN ISO 7253:2002
EN ISO 7253:2001 (E)
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 1513 1992 Paints and varnishes - Examination EN ISO 1513 1994
and preparation of samples for
testing
ISO 1514 1993 Paints and varnishes - Standard EN ISO 1514 1997
panels for testing
ISO 2808 1997 Paints and varnishes - EN ISO 2808 1999
Determination of film thickness
ISO 3270 1984 Paints and varnishes and their raw EN 23270 1991
materials - Temperatures and
humidities for conditioning and
testing
ISO 3696 1987 Water for analytical laboratory use - EN ISO 3696 1995
Specification and test methods
3
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SIST EN ISO 7253:2002
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SIST EN ISO 7253:2002
ATIONAL ISO
STANDARD 7253
Secsnd edition
1996-12-15
Paints and varnishes - Determination of
resistance to neutral salt Spray (fog)
Peintures et vernis - Dgtermination de Ia rksisance au brouillard sahn
neutre
Reference number
ISO 7253: 1996(E)
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SIST EN ISO 7253:2002
ISO 7253: 1996(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bedies). The work of preparing International Standards is normally carried out through ISO technical
committees. Esch 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
Iiaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Kommission (lEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technrcal 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.
International Standard ISO 7253 was prepared by Technical Committee ISO/TC 35, Paints and varnishes,
Subcommittee SC 9, Genera/ fest methods forpaints and varnishes.
This second edition cancels and replaces the first edition (ISO 7253:1984) of which it constitutes a technical
revision. The main changes are:
a) the addition of a calibration procedure to check the corrosivity within the apparatus;
b) more details have been given on the preparation of the scratches to be applied to the Panels.
Annexes A, B and C are an integral part of this International Standard.
0 ISO 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Internet: central @ isocs.iso.ch
x.400: c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
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SIST EN ISO 7253:2002
0 ISO
ISO 7253:1996(E)
lntroduction
There is seldom a direct relationship between the resistance of organic coatings to the action of salt Spray (fog) and
the resistance to corrosion in other environments. This is because the effect of each of the several factors
influencing the progress of corrosion, such as the formation of protective films, varies greatly with the conditions
encountered. Therefore, the results obtained in the test should not be regarded as a direct guide to the corrosion
resistance of the tested coatings in all environments where these coatings may be used. Also, Performance sf
different coatings in the test should not be taken as a direct guide to the relative corrosion resistance of these
coatings in Service, even under the severe conditions of marine exposure. Nevertheless, the method described
gives a means of checking that the quality of a paint or paint System is being maintained.
NOTE 1 The apparatus and operating conditions described in this International Standard comply, but do not necessarily
equate, with ISO 9227:1990, Corrosion tests in artificial atmospheres - SaIt Spray tests. The minimum size of cabinet
permissible for testing paints, varnishes and related products is greater (see 6.1).
. . .
Ill
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SIST EN ISO 7253:2002
INTERNATIONAL STANDARD o ISO ISO 7253: 1996(E)
Determination sf resistance to neutral salt
Paints and varnishes -
1 Scope
This International Standard is one of a series of Standards dealing with the sampling and testing of paints, varnishes
and related products.
lt describes a method for determining the resistance of coatings Po neutral salt Spray (fog) in accordance with the
requirements of coating or product specifications.
2 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to
revision, and Parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the Standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
Sampling of products in liquid or Paste form
ISO 1512:1991, Paints and varnishes -
ISO 1513:1992, Paints and varnishes - Examination and preparation of samples for testing
ISO 1514:1993, Paints and varnishes - Standard pane!s for testing
11, Paints and varnishes - Determination o f film thickness
ISO 2808:-
ISO 3270:1984, Paints and varnishes and their raw materials - Tempera tures and humidities for conditioning and
testing
ISO 3574: 1986, Gold-reduced carbon steel sheef of commercia/ and dra wing qualities
ISO 3696:1987, Water for analytical laboratory use - Specification and test methods
Evaluation of degradation of paint coatings - Designation of intensity,
ISO 4628-1 :1982, Paints and varnishes -
quantity and size of common types of defect - Part 1: Genera/ principles and rating schemes
Evaluation of degrada tion of paint cos tings - Designa tion of intensity,
ISO 4628-2:1982, Paints and varnishes -
quantity and size of common types of defect - Part 2: Designation of degree of blistering
Evaluation of degradation of paint cos tings - Designa tion of intensity,
ISO 4628-3:1982, Paints and varnishes -
quantity and size of common types of defect - Parf 3: Designation of degree of rusting
Evaluation of degradation of paint cos tings - Designa tion of intensity,
ISO 4628-4:1982, Paints and varnishes -
quantity and size of common types of defect - Part 4: Designation of degree of cracking
ISO 4628-5:1982, Paints and varnishes - Evaluation of degrada tion of paint cos tings - Designa tion of intensity,
quantity and size of common types of defect - Part 5: Designation of degree of flaking
1) To be published. (Revision of ISO 2808:1991)
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SIST EN ISO 7253:2002
ISO 7253:1996(E) 0 1%
3 Principle
A coated test Panel is exposed to neutral salt Spray (fog) and the effects of exposure are evaluated by criteria
agreed in advance between the interested Parties, these criteria usually being of a subjective nature.
4 Required supplementary information
For any particular application, the test method specified in this International Standard needs to be completed by
supplementary information. The items of supplementary information are given in annex A.
5 Test solution
5.1 The test Solution shall be prepared by dissolving sodium chloride in water of at least grade 3 purity as defined in
ISO 3696 to produce a concentration of (50 t 5) g/l. The sodium chloride shall be white, of minimum assay 99,6 %
(mlm), and substantially free from topper and nickel; it shall contain not more than 0,l o/o (mlm) of sodium iodide. If
the pH of the Solution is outside the range 6,0 to 7,0, the presence of undesirable impurities in the salt or the water
or both shall be investigated.
5.2 The pH of the test Solution (5.1) shall be adjusted so that the pH of sprayed Solution collected within the test
cabinet (see clause 6) shall be between 6,5 and 7,2. Any necessary adjustment to the pH shall be made by
additions of solutions of either hydrochloric acid or sodium bicarbonate of analytical grade.
NOTE 2 Attention is drawn to the possible changes in pH resulting from loss of carbon dioxide from the test Solution when it is
sprayed. Such changes may be avoided by reducing the carbon dioxide content of the Solution by, for example, heating it to a
temperature above 35 “C before it is placed in the apparatus or by making the Solution from freshly boiled water.
filtered before it is placed in the reservoir of the apparatus, in Order to remove
5.3 The test Solution shall be
anY
the nozzle(s) of the spraying device.
solid matter which might block
6 Apparatus
Ordinary laboratory apparatus and glassware, together with the following:
6.1 A Spray cabinet, made of, or lined with, material resistant to corrosion by the Spray and with a roof which
prevents condensed moisture dripping on to the test Panels. The cabinet shall have a capacity of not less than
O,4 m3 since, with smaller volumes, difficulties are experienced in ensuring even distribution of Spray.
The size and shape of the cabinet shall be such that the quantity of Solution collected in the spray-collecting devices
(6.4) is within the limits stated in 10.2.
than 2 m3 will
Cabinets with a volume greater be difficult to operate unless careful consideration is given to their
which shall be
design and construction. Factors taken into consideration are g iven in annex B.
6.2 Adjustable heater, adequate to maintain the cabinet and its contents at the specified temperature (see 10.1).
The temperature shall be controlled by a thermostat element placed within the cabinet at least 100 mm from the
Walls. A thermometer, capable of being read from the outside, shall be placed wholly within the cabinet at least
100 mm from the Walls, roof or floor.
6.3 Spraying device, comprising a supply of clean compressed air of constant pressure and humidity, a reservoir
containing the Solution to be sprayed and one or more Spray nozzles made of material resistant to the Solution.
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SIST EN ISO 7253:2002
0 ISO
ISO 7253: 1996(E)
The compressed air supply to each Spray nozzle shall be passed through a filter to remove all traces of oil or solid
matter and shall be at a pressure of 70 kPa to 170 kPa*). In Order to prevent evaporation sf the Spray droplets, the
air shall be humidified before entering each nozzle by passage through a Saturation column containing water of at
least grade 3 purity as defined in ISO 3696 at a temperature several degrees Celsius higher than that of the cabinet.
The actual temperature of the water will depend on the pressure used and on the type of Spray nozzle, and shall be
adjusted so that the rate of collection of Spray in the cabinet and the sodium chloride concentration of the Spray
collected are kept within the specified limits (see 10.2).
The reservoir containing the test Solution
...
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