ISO/TR 19032:2019
(Amendment)Plastics — Use of polyethylene reference specimens (PERS) for monitoring laboratory and outdoor weathering conditions
Plastics — Use of polyethylene reference specimens (PERS) for monitoring laboratory and outdoor weathering conditions
This document describes a method that demonstrates the use of polyethylene reference specimens (PERS) for monitoring laboratory and outdoor conditions in weathering tests used for plastics.
Plastiques — Utilisation d'éprouvettes de référence en polyéthylène pour l'évaluation des conditions de vieillissement climatique
General Information
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Standards Content (sample)
TECHNICAL ISO/TR
REPORT 19032
Second edition
2019-09
Plastics — Use of polyethylene
reference specimens (PERS) for
monitoring laboratory and outdoor
weathering conditions
Plastiques — Utilisation d'éprouvettes de référence en polyéthylène
pour l'évaluation des conditions de vieillissement climatique
Reference number
ISO/TR 19032:2019(E)
ISO 2019
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ISO/TR 19032:2019(E)
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ISO/TR 19032:2019(E)
Contents Page
Foreword ........................................................................................................................................................................................................................................iv
Introduction ..................................................................................................................................................................................................................................v
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Terms and definitions ..................................................................................................................................................................................... 1
4 Background information.............................................................................................................................................................................. 1
5 Material .......................................................................................................................................................................................................................... 1
5.1 General ........................................................................................................................................................................................................... 1
5.2 Preparation of PERS ........................................................................................................................................................................... 2
6 Procedure..................................................................................................................................................................................................................... 2
6.1 Method for measuring the carbonyl index of PERS ................................................................................................. 2
6.2 Round robin test of laboratory light-source exposure devices with PERS .......................................... 3
6.2.1 General...................................................................................................................................................................................... 3
6.2.2 Xenon-arc-lamp exposure ........................................................................................................................................ 3
6.2.3 Open-flame carbon-arc-lamp exposure ....................................................................................................... 4
6.2.4 Fluorescence lamp exposure ................................................................................................................................. 4
6.3 Outdoor exposure test of PERS ................................................................................................................................................. 4
6.4 Consistency of laboratory light-source exposure devices ................................................................................. 5
7 Results and discussion ................................................................................................................................................................................... 6
7.1 Result of RRT of laboratory light-source exposure devices with PERS .................................................. 6
7.1.1 Xenon-arc-lamp exposure ........................................................................................................................................ 6
7.1.2 Open-flame carbon-arc-lamp exposure ....................................................................................................10
7.1.3 Fluorescent lamp exposure .................................................................................................................................10
7.2 Characterizing the conditions of outdoor exposure test site .......................................................................11
7.3 Examples of correlation between outdoor exposure test and laboratory light-source exposure test using PERS ..........................................................................................................................................12
7.4 Control limit of particular laboratory light-source exposure apparatus ...........................................13
8 Conclusion ................................................................................................................................................................................................................14
8.1 Results of RRT .......................................................................................................................................................................................14
8.2 Outdoor exposure of PERS .........................................................................................................................................................15
8.3 Correlation between outdoor and xenon-arc-lamp exposure for PERS .............................................15
8.4 Consistency of laboratory light-source exposure devices ..............................................................................15
Bibliography .............................................................................................................................................................................................................................16
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ISO/TR 19032:2019(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.The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing,
chemical and environmental resistance.This second edition cancels and replaces the first edition (ISO/TR 19032:2006), which has been
technically revised.The main changes compared to the previous edition are as follows:
— the shipping address of PERS in 3.1 has been cancelled;
— a cautionary sentence has been added in Clause 4.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.iv © ISO 2019 – All rights reserved
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ISO/TR 19032:2019(E)
Introduction
The method described in this document demonstrates the use of polyethylene reference specimens
(PERS) for monitoring conditions in weathering tests used for plastics. PERS has double bonds in its
molecular structure, which are easily oxidized to produce carbonyl groups. The change in carbonyl
index of PERS is produced by the combined effects of ultraviolet (UV) and temperature. Therefore, the
carbonyl groups proportionally increase, depending on the received UV and temperature. Based on this
relationship, the effect of UV radiation and temperature on PERS can be expressed quantitatively. For
laboratory-accelerated exposures, PERS is also sensitive to changes in the chamber air temperature.
The effect of moisture was not determined in the study.© ISO 2019 – All rights reserved v
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TECHNICAL REPORT ISO/TR 19032:2019(E)
Plastics — Use of polyethylene reference specimens
(PERS) for monitoring laboratory and outdoor weathering
conditions
1 Scope
This document describes a method that demonstrates the use of polyethylene reference specimens
(PERS) for monitoring laboratory and outdoor conditions in weathering tests used for plastics.
2 Normative referencesThere are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp— IEC Electropedia: available at http: //www .electropedia .org/
4 Background information
Degradation of plastics in an outdoor environment is mainly influenced by the ultraviolet radiation
received, environmental temperature, moisture, etc. Especially in photo-oxidation induced from
ultraviolet radiation, temperature plays a very important role. Measuring the ultraviolet radiation
during the exposure period is useful for comparison of the result of the exposure test, but it is not
enough to compare the exposure results. Therefore, it is very important to find some index that can be
used to evaluate the complex effect of received ultraviolet radiation and environmental temperature.
PERS is used to characterize the level of combined effect of ultraviolet radiation and temperature, and
its characteristic proportionally increases depending on the UV radiation and temperature received.
NOTE The test results presented in this document were generated with PERS from Japan Weathering Test
Center 1-3-7 Shibakoen Minatoku Tokyo Japan. This material is no longer available. No new material has been
qualified to be used as a replacement in this document at the time of its publication.
5 Material5.1 General
PERS is high-density polyethylene polymerized using molybdenum dioxide as a catalyst, containing the
trans-form vinylene group. Other basic properties are as follows:— absorbance ratio of trans-form vinylene group to methylene group: 1,0 to 1,3;
— melt flow rate (2,16 kg, 190 °C): 0,2 g to 0,4 g/10 min;
3 3
— density: 950 kg/m to 965 kg/m ;
— thickness: (0,2 ± 0,02) mm.
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ISO/TR 19032:2019(E)
5.2 Preparation of PERS
After kneading for 5 min, the material between two rolls whose surfaces are heated at 150 °C to 170 °C
are cut into small pieces of 0,4 g to 0,5 g.After pre-heating for 90 s in a compression moulding machine with a surface that is heated at 160 °C to
180 °C, the material is compressed for 60 s, cooled in a compression moulding machine with a surface
temperature of 30 °C to 40 °C for 60 s, and the press sheet of the thickness mentioned above is prepared.
6 Procedure6.1 Method for measuring the carbonyl index of PERS
An infrared (IR) spectrophotometer should be used as the measuring apparatus.
–1 –1
The infrared absorption spectra is measured after irradiation, in the range of 2 200 cm to 1 600 cm .
In this case, the same method for a quantitative analysis is used for the scanning speed.
The carbonyl index is determined in accordance with Formula (1), based upon infrared absorbance
spectra of exposed PERS. Absorbance at near 2 020 cm peak is employed as an internal standard to
correct for sample film thickness, while absorbance at near 1 715 cm peak is used to indicate carbonyl
group content. A typical diagram of IR absorbance is shown in Figure 1.1 715
A = (1)
2 020
where
A is the absorbance ratio (carbonyl index);
A is the absorbance at near 1 715 cm (I − I );
1 715 0
A is the absorbance at near 2 020 cm (I − I );
2 020 0
I is the absorbance measured by the base-line method at individual wave number;
I is the absorbance at the peak of individual wave number.
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Key
Y absorbance
X wavenumber (cm )
1 peak near 2 020 cm
2 peak near 1 715 cm
Figure 1 — IR absorbance diagram showing base line and peak absorbance
6.2 Round robin test of laboratory light-source exposure devices with PERS
6.2.1 General
It is well known that the degradation of plastics materials or products used outdoors will occur by the
combined effect of ultraviolet radiation and temperature, or other factors. It is also recognized that
the reproducibility in the laboratory light-source exposure test will vary with the change in ultraviolet
spectrum distributions and the chamber temperatures caused by deterioration of lamps and filters
with operating time, even if ultraviolet radiation and black standard temperature (BST) or black panel
temperature (BPT) are under constant conditions.Since PERS can quantitatively evaluate, as carbonyl index, the combined effect of UV radiation and
temperature, the carbonyl index obtained can reflect changes in a given environment.
In order to verify the repeatability and reproducibility of the specimens and exposure test, the round
robin test (RRT) using PERS by laboratory light-source exposure devices in ISO/TC 61/SC 6 was
conducted.6.2.2 Xenon-arc-lamp exposure
[1]
The test conditions were according to ISO 4892-2 . The conditions are shown in Table 1. It was not
requested to control the chamber temperature, but participants have been requested to report this
temperature.Each participant has been provided with 4 sets of PERS that were mounted in 150 mm × 70 mm plastics
holders. One set of holders consists of 3 pieces of PERS.© ISO 2019 – All rights reserved 3
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ISO/TR 19032:2019(E)
Table 1 — Exposure conditions for xenon-arc lamp
Filter daylight filter
2 2
Irradiance 0,5 W/(m ·nm) at 340 nm or 60 W/m (300 nm to 400 nm)
BST or BPT (65 ± 3) °C for BST or (63 ± 3) °C for BPT
Chamber temperature Arbitrary
Water spray 102 min of light only followed by 18 min of light plus water spray
Humidity (50 ± 5) %
Period 24 h, 48 h, 72 h and 96 h
6.2.3 Open-flame carbon-arc-lamp exposure
[2]
The test conditions were according to ISO 4892-4 . The conditions are shown in Table 2. The chamber
temperature was not specified, but participants were requested to report this temperature.
Each participant has been provided with 4 sets of PERS that were mounted in 150 mm × 70 mm plastics
holders. One set of holders consists of 3 pieces of PERS.Table 2 — Exposure conditions for open-flame carbon-arc lamp
Filter Type 1 (Type 1 known as Corex 7058 filter)
BST or BPT (65 ± 3) °C for BST or (63 ± 3) °C for BPT
Chamber temperature Arbitrary
Water spray 102 min light only followed by 18 min of light plus water spray
Humidity (50 ± 5) %
Period 24 h, 48 h, 72 h and 96 h
6.2.4 Fluorescence lamp exposure
[3]
The test conditions were according to ISO 4892-3 . The conditions are shown in Table 3. Irradiance
was not specified at any intensity.Each participant was provided with 4 sets of PERS that were mounted in 150 mm × 70 mm plastics
holders. One set of holders consists of 3 pieces of PERS.Table 3 — Exposure conditions for fluorescent lamp
Lamp type UVA340
Irradiance Arbitrary
Mode Mode 1: 4 h of dry UV exposure followed by 4 h of condensation
BPT (63 ± 3) °C at UV exposure and (50 ± 3) °C at condensation
Period 8 h, 24 h, 32 h and 48 h
After each sample had been exposed for each exposure period, the carbonyl index was determined,
based upon the method described in 6.1.6.3 Outdoor exposure test of PERS
The result of the outdoor exposure test varies, even if it is conducted in the same place, because of
differences due to the seasonal climate changes. Although it is useful to measure the amount of
ultraviolet radiation for comparison of exposure tests, it is not enough in the comparison only to consider
the amount of ultraviolet radiation, because plastics are influenced not only by ultraviolet radiation but
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ISO/TR 19032:2019(E)
by temperature or by moisture. Since PERS is influenced by the combined effect of ultraviolet radiation
and temperature, PERS have been exposed in various places where the climate was different.
Six locations in different climates and different countries were selected: Sapporo, Choshi, Miyakojima
(Japan), Serpong, Bandung (Indonesia) and Phoenix (USA). Locations and exposure angles are shown in
Table 4.Table 4 — Locations and exposure angles
Exposure site Exposure angle Latitude
Sapporo (Japan) 45° South 43° 03′ N
Choshi (Japan) 30° South 35° 43′ N
Miyakojima (Japan) 20° South 24° 44′ N
Serpong (Indonesia) 5° South and north 6° 15′ S
Phoenix (USA) 34° South 33° 54′ N
From November to February, the samples face south; and from March to October, they face north.
[4]The conditions of the outdoor exposure test are based on the relevant ISO 877 part . Three pieces
of PERS were exposed for 1 month. By replacing exposed PERS with new ones, the exposure test was
repeated in the following months successively. The exposure test was repeated successively for more
than 24 months.The practical procedure of the outdoor exposure test is shown below.
1) The conditions of the outdoor exposure test are based on the relevant ISO 877 part.
2) Prepare a minimum of three PERS and expose them for 1 month. It is desirable to expose them at
the beginning of a calendar month, in order to evaluate the condition of the month.
3) By replacing exposed PERSs with new ones, the exposure test is repeated in the following months
successively.4) The exposure test is repeated successively for at least 12 months.
5) The accumulated value of the carbonyl index for each month will be adopted for the index of
combined effect of UV radiation and temperature at the site of exposure.6.4 Consistency of laboratory light-source exposure devices
It is recognized that changes in the characteristics of lamps and filters with time, and changes in the
chamber temperature of laboratory light-source exposure devices, influence the reproducibility
and repeatability of test results, even if the test is operated under constant conditions of ultraviolet
radiation and BST or BPT.Since the carbonyl index of a polyethylene reference specimen is proportional to the environment where
ultraviolet radiation and temperature are compounded, consistency of the exposure environment could
be monitored with this reference material.In order to verify the correct operation of a particular xenon-arc-lamp device, the control limit was
determined by PERS.The test conditions were according to ISO 4892-2. For different operating times of lamp and filters,
exposure was repeated three times.The practical procedure was carried out as follows.
1) The cond
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