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12373-8:1999
The European Standard EN 12373-8:1998 has the status of a
British Standard
ICS 25.220.20; 77.120.10
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
Aluminium and
aluminium alloys Ð
Anodizing Ð
Part 8: Determination of the comparative
fastness to ultra-violet light and heat of
coloured anodic oxidation coatings
Trang 2BS EN 12373-8:1999
This British Standard, having
been prepared under the
direction of the Sector
Committee for Materials and
Chemicals, was published under
the authority of the Standards
Committee and comes into effect
on 15 April 1999
ISBN 0 580 32026 X
Amendments issued since publication
National foreword
This British Standard is the English language version of EN 12373-8:1998 It supersedes BS 6161-8:1981 which is withdrawn
The UK participation in its preparation was entrusted to Technical Committee STI/32, Anodic oxidation coatings on aluminum, which has the responsibility to:
Ð aid enquirers to understand the text;
Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
Ð monitor related international and European developments and promulgate them in the UK
A list of organizations represented on this committee can be obtained on request to its secretary
Cross-references
The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue
A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application
Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover
Trang 3European Committee for Standardization Comite EuropeÂen de Normalisation EuropaÈisches Komitee fuÈr Normung
Central Secretariat: rue de Stassart 36, B-1050 Brussels
1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members
Ref No EN 12373-8:1998 E
NORME EUROPE Â ENNE
EUROPA È ISCHE NORM November 1998
ICS 25.220.20; 77.120.10
Descriptors: surface treatment, anodizing, aluminium, aluminium alloys, ultra-violet radiation tests, colour fastness, comparative method
English version
Aluminium and aluminium alloys Ð Anodizing Ð Part 8: Determination of the comparative fastness to ultra violet
light and heat of coloured anodic oxidation coatings
Aluminium et alliages d'aluminium Ð
Anodisation Ð
Partie 8: DeÂtermination de la solidite compareÂe aÁ la
lumieÁre ultraviolette et aÁ la chaleur des couches
anodiques coloreÂes
Aluminium und Aluminiumlegierungen Ð Anodisieren Ð
Teil 8: Vergleichsbestimmung der BestaÈndigkeit von gefaÈrbten, anodisch erzeugten Oxidschichten gegen ultravioletes Licht und WaÈrme
This European Standard was approved by CEN on 5 November 1998
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, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
United Kingdom
Trang 4Page 2
EN 12373-8:1998
Foreword
This European Standard has been prepared by
Technical Committee CEN/TC 132, Aluminium and
aluminium alloys, the Secretariat of which is held by
AFNOR
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 May 1999, and
conflicting national standards shall be withdrawn at
the latest by May 1999
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
It is based upon ISO 6581:1980
EN 12373, Aluminium and aluminium alloys Ð
Anodizing, comprises the following parts:
Part 1: Method for specifying decorative and protective
anodic oxidation coatings on aluminium.
Part 2: Determination of mass per unit area (surface
density) of anodic oxidation coatings Ð Gravimetric
method.
Part 3: Determination of thickness of anodic
oxidation coatings Ð Non-destructive measurement
by split beam microscope.
Part 4: Estimation of loss of absorptive power of
anodic oxidation coatings after sealing by dye spot
test with prior acid treatment.
Part 5: Assessment of quality of sealed anodic
oxidation coatings by measurement of admittance.
Part 6: Assessment of quality of sealed anodic
oxidation coatings by measurement of the loss of
mass after immersion in phosphoric acid/chromic
acid solution without prior acid treatment.
Part 7: Assessment of quality of sealed anodic
oxidation coatings by measurement of the loss of
mass after immersion in phosphoric acid/chromic
acid solution with prior acid treatment.
Part 8: Determination of the comparative fastness to
ultra-violet light and heat of coloured anodic
oxidation coatings.
Part 9: Measurement of wear resistance and wear index of anodic oxidation coatings using an abrasive wheel wear test apparatus.
Part 10: Measurement of mean specific abrasion resistance of anodic oxidation coatings using an abrasive jet test apparatus.
Part 11: Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles
of 20Ê, 45Ê, 60Ê or 85Ê.
Part 12: Measurement of reflectance characteristics of aluminium surfaces using integrating-sphere
instruments.
Part 13: Measurement of reflectivity characteristics of aluminium surfaces using a goniophotometer or an abridged goniophotometer.
Part 14: Visual determination of image clarity of anodic oxidation coatings Ð Chart scale method Part 15: Assessment of resistance of anodic oxidation coatings to cracking by deformation.
Part 16: Check for continuity of thin anodic oxidation coatings Ð Copper sulfate test.
Part 17: Determination of electric breakdown potential.
Part 18: Rating system for the evaluation of pitting corrosion Ð Chart method.
Part 19: Rating system for the evaluation of pitting corrosion Ð Grid method.
Contents
Page
Trang 5Page 3
EN 12373-8:1998
Introduction
The test described in this standard represents severe
exposure to ultra-violet light and, because of its
severity, provides a very rapid determination of the
comparative light-fastness of coloured anodic oxidation
coatings
It has to be realized, however, that the light emitted by
the mercury vapour source used in the test has a
discontinuous spectrum and a high content of
ultra-violet radiation Care should therefore be taken in
comparing the results of this test with the results of
exposure to sunlight
Considerable heat is generated by the light source and
the test needs to be carried out in such a way that the
temperature of the test pieces during the test does not
exceed 100 8C
1 Scope
This Part of this European Standard specifies a
comparative method for the determination of the
fastness of coloured anodic oxidation coatings to
ultra-violet light and heat
The method is not suitable for testing coloured anodic
oxidation coatings that are heat sensitive
temperatures.
2 Principle
Test pieces are exposed to ultra-violet light and the
colour changes taking place are observed and
compared with standard or control specimens
3 Apparatus
3.1 General
The apparatus consists of a cabinet made from suitable
heat-resistant material with a source of ultra-violet light
and an arrangement of specimen holders or supports
placed at an equal distance from the light source
3.2 Cabinet
The cabinet shall be designed so that all exposed test
pieces can be positioned at equal distances from the
lamp
centre, or a cabinet of rectangular cross-section with the lamp
placed horizontally above a support on which the test pieces are
placed, is suitable.
Increasing the test temperature increases the rate of
fading of the test pieces and their surface temperature
in the test cabinet shall not be allowed to
exceed 100 8C during any part of the test In some
cases, this will require the cabinet and test pieces to be
cooled by means of a suitable fan Care shall be taken
to avoid over-cooling the lamp itself as this may affect
the arc, and the lamp manufacturer's advice on this
aspect should be followed
WARNING NOTE The cabinet shall be totally
enclosed or suitably baffled to eliminate any possibility
of ultra-violet light escaping, since certain ultra-violet wavelengths can damage the eyes A micro-switch shall
be fitted to the opening part of the cabinet such that the light source is automatically switched off when the cabinet is opened
Many ultra-violet light sources produce ozone under
the conditions of test (see 3.3) and this can also
constitute a health hazard If ozone is produced by the action of the lamp, it is desirable to have forced air circulation and it is essential that the air from the cabinet is ducted to a point outside the building If in doubt, consult the manufacturer
3.3 Ultra-violet light source
The ultra-violet lamp shall be a medium pressure mercury arc-lamp with a silica envelope, controlled by
a suitable transformer and switch
The power of the lamp and its arc length shall be such that the approximate intensities shown in Table 1 are recorded at a distance of 190 mm from its centre
Table 1 Ð Approximate UV light intensities
at 190 mm from the centre of the lamp
Wavelength
nm
Intensity
lamp with an effective arc length of 120 mm, placed at a distance
of approximately 190 mm from the specimens.
Most lamps have a recommended life of about 1 000 h and during use there will be a decrease in output, especially at wavelengths below 313 nm It is therefore desirable to use an intensity regulator for the lamp, which will compensate, to some extent, for this decrease.
Care should be taken to avoid handling the silica envelope of the lamp as this can cause it to de-vitrify.
Although ozone has little effect on the test results, it is desirable that the lamp used does not produce ozone, as this avoids the necessity for ducting the air outside.
3.4 Specimen arrangement
The apparatus shall be arranged so that specimens can
be placed in suitable holders or on a suitable support and are equidistant from the light source Care shall be taken to ensure that the specimens are not shielded from the light source, by the supporting column for the lamp or by glass
Trang 6Page 4
EN 12373-8:1998
4 Procedure
4.1 General
Expose the specimens to ultra-violet light in the
cabinet (3.2) until the colour change on either the test
piece or the control specimen reaches a predetermined
level, as agreed between anodizer and purchaser
apparatus used and the colour anodized finish being assessed.
This test is severe by comparison with other light-fastness tests,
and most colour anodized finishes will show significant colour
changes in exposure times of less than 100 h.
In order to facilitate the detection of colour changes,
partly mask the exposed surface of the specimens by a
material opaque to ultra-violet light
4.2 Control specimens
Because of the severity of the test and the fact that it
is intended to be used for comparative purposes, it is
preferable to use standard colour anodized specimens
of known ultra-violet light resistance for control
purposes Expose any control specimens with the test
pieces and partly mask these in a similar way
4.3 Effect of ozone production
The presence of ozone has very little effect on the
colour change of colour anodized specimens However,
if a light surface bloom forms on the surface of
specimens tested in an ozone-containing atmosphere,
remove this with a mild abrasive cleaner before
specimen evaluation
5 Expression of results
Record the exposure time required for the colour change of either the test piece or the control specimen
to reach the predetermined level agreed between anodizer and purchaser
6 Test report
The test report shall contain at least the following information:
a) the type and identification of the product tested; b) a reference to this European Standard;
c) the colour and, where known, the method of production of the test piece;
d) the control specimens used;
e) details of the apparatus used and the time(s) of
exposure (see clause 5);
f) the colour changes observed in the test piece compared to the masked area and/or control specimen;
g) any deviation, by agreement or otherwise, from the procedure specified;
h) the date of the test
Trang 7blank
Trang 8389 Chiswick High Road
London
W4 4AL
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