SIST EN ISO 4892-2:2000
(Main)Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc sources (ISO 4892-2:1994)
Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc sources (ISO 4892-2:1994)
Migrated from Progress Sheet (TC Comment) (2000-07-10): UAP was launched on ISO 4892-2:1994 (TA/980623)
Kunststoffe - Künstliches Bewittern oder Bestrahlen in Geräten - Teil 2: Gefilterte Xenonbogenstrahlung (ISO 4892-2:1994)
Dieser Teil von ISO 4892 legt Verfahren zur Bestrahlung von Probeko(rpern mit Xenonbogenlampen fest. Allgemeine Richtlinien werden in ISO 4892-1 angegeben.
Plastiques - Méthodes d'exposition a des sources lumineuses de laboratoire - Partie 2: Sources a arc au xénon (ISO 4892-2:1994)
Polimerni materiali - Metode izpostavitve laboratorijskim virom svetlobe - 2. del: Ksenonske svetilke (ISO 4892-2:1994)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 4892-2:2000
01-maj-2000
Polimerni materiali - Metode izpostavitve laboratorijskim virom svetlobe - 2. del:
Ksenonske svetilke (ISO 4892-2:1994)
Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc sources
(ISO 4892-2:1994)
Kunststoffe - Künstliches Bewittern oder Bestrahlen in Geräten - Teil 2: Gefilterte
Xenonbogenstrahlung (ISO 4892-2:1994)
Plastiques - Méthodes d'exposition a des sources lumineuses de laboratoire - Partie 2:
Sources a arc au xénon (ISO 4892-2:1994)
Ta slovenski standard je istoveten z: EN ISO 4892-2:1999
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 4892-2:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 4892-2:2000
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SIST EN ISO 4892-2:2000
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SIST EN ISO 4892-2:2000
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SIST EN ISO 4892-2:2000
IS0
INTERNATIONAL
4892-2
STANDARD
First edition
1994-05-01
- Methods of exposure to
Plastics
laboratory light sources -
Part 2:
Xenon-arc sources
P/as tiques - M&hodes d’exposition 2 des sources lumineuses de
labora toire -
Partie 2: Sources 9 arc au x&non
Reference number
IS0 4892-2:1994(E)
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SIST EN ISO 4892-2:2000
IS0 4892-2: 1994(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 4892-2 was prepared by Technical Committee
!SO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemica/ and environ-
mental resistance.
Together with the other parts of IS0 4892, it cancels and replaces
IS0 4892:1981, of which it constitutes a technical revision.
IS0 4892 consists of the following parts, under the general title
P/as tics - Methods of exposure to laboratory light sources:
- Part 7: General guidance
- Part 2: Xenon-arc sources
- Part 3: Fluorescent UV lamps
- Part 4: Open-flame carbon-arc lamps
Annex A of this part of IS0 4892 is for information only.
0 IS0 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
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SIST EN ISO 4892-2:2000
INTERNATIONAL STANDARD 0 IS0 IS0 4892-2: 1994(E)
Plastics - Methods of exposure to laboratory light
sources -
Part 2:
Xenon-arc sources
3 Principle
1 Scope
This part of IS0 4892 specifies methods for exposing
specimens to xenon-arc light sources. General guid-
3.1 A xenon arc, when fitted with suitable filters
ance is given in IS0 4892-l.
and properly maintained, produces radiation with a
spectral energy distribution similar to that of terrestrial
2 Normative references
sunlight in the ultraviolet and visible regions of the
spectrum.
The following standards contain provisions which,
through reference in this text, constitute provisions
of this part of IS0 4892. At the time of publication, the
editions indicated were valid. All standards are subject
3.2 Specimens of the samples to be tested are ex-
to revision, and parties to agreements based on this
posed to the light source under controlled environ-
part of IS0 4892 are encouraged to investigate the
mental conditions.
possibility of applying the most recent editions of the
standards indicated below. Members of IEC and IS0
maintain registers of currently valid International
Standards.
3.3 The procedure may include measurement of the
irradiance and radiant exposure at the surface of the
IS0 4582:1980, Plastics - Determination of changes
specimen.
in colour and variations in properties after exposure to
daylight under glass, natural weathering or artificial
.
light .
3.4 It is recommended that a similar material of
IS0 4892-l : 1994, Plastics - Methods of exposure to
known behaviour be exposed simultaneously with the
labora tory light sources - Part 1: General guidance.
experimental material as a reference.
Cl E Publication No. 20: 1972, Recommendations for
the integrated irradiance and the spectral distribution
of simulated solar radiation for testing purposes. 3.5 Intercomparison of results obtained from speci-
mens exposed in different apparatus should not be
CIE Publication No. 85:1989, Technical Report - So- made unless reproducibility has been established
lar spectral irradiance. among devices for the material to be tested.
1
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SIST EN ISO 4892-2:2000
IS0 4892-2: 1994(E) 0 IS0
4 Apparatus
- Relative spectral irradiance for
Table 1
artificial weathering (method A)
I I
Relative spectral
Wavelength, A
irradiancel)
4.1 Laboratory light source
nm %
290 < 1 \< 800 100
R < 290 02)
4.1.1 Quartz-jacketed xenon-arc lamps emit radiation
290 < A. < 320 0,6 + 0,2
in a range that extends from below 270 nm in the -
ultraviolet through the visible region of the spectrum
320 < R < 360 4,2 + 0,5
-
and into the infrared.
360 < A < 400 62 k 1 ,O
To simulate direct natural exposure, the radiant en-
I) The spectral irradiance between 290 nm and
ergy must be filtered to provide a spectral power dis-
800 nm is defined as 100 %.
tribution that closely approximates to that of terrestrial
2) Xenon arcs operating as specified in method A emit
daylight (method A), as described in CIE Publication
a small amount of radiation below 290 nm. In some
No. 85.
cases, this can cause degradation reactions which do
not occur in outdoor exposures.
Filters designed to reduce the irradiance below
320 nm are used to simulate daylight filtered through
window glass (method B).
Table 2 - Relative spectral irradiance for
daylight behind window glass (method B)
Additional filters to reduce the level of non-actinic in-
Relative spectral
frared energy may be desirable when heating of the
Wavelength, R
irradiancel)
specimen adversely influences the photochemical-
reaction rate or causes thermal degradation not ex- nm %
I
perienced during real-time natural exposure.
300 < R \< 800 100
The characteristics of xenon arcs and filters are sub-
0
;1 \< 300
ject to change during use due to ageing, and lamps
300 < A < 320 < 0,l
and filters shall be replaced at suitable intervals. Fur-
thermore, they are subject to change due to the ac- 3,O * 0,5
320 < A. < 360
cumulation of dirt and shall therefore be cleaned at
360 < ;1 < 400 60 k I,0
suitable intervals. Follow the manufacturer’s rec-
I) The spectral irradiance between 300 nm and
ommendations for replacement and cleaning of lamps
800 nm is defined as 100 %.
and filters. I
4.1.4 The irradiance at the test specimen surface
shall not vary by more than & 10 % comparing any
4.1.2 Recommendations for UV-radiation distri-
two points in the sample holder plane parallel to the
butions of filtered xenon-arc sources, together with
lamp axis. If this is not possible, specimens shall be
tolerance limits, are given in table 1 for artificial
periodically repositioned to provide equivalent ex-
weathering (method A) and table2 for simulated ex-
posure periods in each location.
posure to daylight behind window glass (method B).
NOTE 1
Depending on the exact design of test chamber
spectral-irradiance values may be time-
(4.2) used, th e
averaged values.
4.1.3 For reference purposes, an irradiance of
550 W/m* in the 290 nm to 800 nm passband has
been selected (see CIE Publication No. 20). It is not
4.2 Test chamber
necessarily the preferred irradiance. When mutually
agreed upon between interested parties, other
The test chamber contains a frame, carrying specimen
irradiance levels may be selected. Report the
holders if necessary, with provision for passing air
irradiance and the passband selected.
over the specimens for temperature control.
2
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SIST EN ISO 4892-2:2000
0 IS0 IS0 4892-2:1994(E)
The source(s) of radiant energy shall be located, with water shall leave no observable stains or deposits and
respect to the specimens, such that the irradiance at should therefore preferably contain less than 1 ppm
the specimen surface complies with 4.1.3 and 4.1.4. of solids. In addition to distillation, a combination of
deionization and reverse osmosis can be used to
Should any ozone be generated from operation of the
produce water of the required quality. The pH of the
lamp(s), the lamp(s) shall be isolated from the test
water used shall be reported.
specimens and operating personnel. If the ozone is in
an air stream, it shall be vented directly to the outside
4.7 Specimen holders
of the building.
Specimen holders may be in the form of an open
To reduce the effect of any eccentricity in the lamp,
frame, leaving the back of the specimen exposed, or
or when more than one lamp is used in a single
they may provide the specimen with a solid backing.
chamber to increase irradiance, the uniformity of ex-
They shall be made from inert materials that will not
posure may be improved by rotating the frame carry-
affect the test results, for example non-oxidizing al-
ing the specimens around the light source(s) and, if
loys of aluminium or stainless steel. Brass, steel or
necessary, by periodically changing the position of
copper shall not be used in the vicinity of the test
each specimen.
specimens. The backing used may affect the results,
particularly with transparent specimens, and shall be
The specimen holders may also rotate about their
agreed on between the interested parties.
own axis, thus exposing directly to the radiation from
the light source the side of the specimen holder that
was previously not directly exposed. 4.8 Apparatus to assess changes in
properties
Programmes may be used which employ a dark cycle
obtained by extinguishing the light source to provide
The apparatus required by the International Standards
controlled exposure conditions without the presence
relating to the determination of the properties chosen
of simulated solar radiation.
for monitoring (see also IS0 4582) shall be used.
When any of these operating modes or programmes
5 Test specimens
are used, they shall be reported in full.
Refer to IS0 4892-l.
4.3 Radiometer
6 Test conditions
When a radiometer is used, it shall comply with the
requirements outlined in IS0 4892-l :1994, subclause
. .
52 6.1 Black-standard/black-panel temperature
Two black-standard temperatures have been selected
4.4 Black-standard/black-panel thermometer
for reference purposes:
The black-standard or black-panel thermometer used
65 “C + 3 “C
shall comply with the requirements outlined in
IS0 4892-l :I 994, subclause 5.1.5.
100 "C + 3 "C
-
NOTE 2 The higher temperature is intended for special
4.5 Relative-humidity control equipment
tests, but will increase the tendency of the specimen to
undergo thermal degradation and influence the test results.
The relative humidity of the air passing over the test
specimens shall be controlled at an agreed value, and
These temperatures are not necessarily the preferred
measured by suitable instruments inserted into the
ones. When mutually agreed upon, another tempera-
test chamber and shielded from the lamp radiation.
ture may be selected, but shall be stated in the ex-
posure report.
Spray system
4.6
If water spray is used, the temperature requirements
Specimens may be sprayed with distilled or apply to the end of the dry period. If the thermometer
demineralized water (having a conductivity below does not attain equilibrium during a short cycle, the
5 pS/cm) intermittently under specified conditions. specified temperature shall be established without
The spray system shall be made from inert materials water spray and the maximum temperature attained
that do not contaminate the water employed. The during the dry cycle shall be reported.
3
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SIST EN ISO 4892-2:2000
0 IS0
IS0 4892-2: 1994(E)
Even if the exposure apparatus is operated in an specimen by suitable indelible marking, avoiding areas
alternating mode, measurement by black-standard to be used for subsequent testing. As a check, a plan
thermometer shall be carried out in the continuous of the test-specimen positions may be made.
mode.
If desired, in the case of specimens used to deter-
If a black-panel thermometer is used, then the type mine change in colour and appearance, a portion of
of thermometer, the way in which it is mounted on
each test specimen may be shielded by an opaque
the specimen holder and the selected temperature of cover throughout the test. This gives an unexposed
operation shall be stated
...
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