ISO/TR 19032:2019 pdf download – Plastics — Use of polyethylene reference specimens (PERS) for monitoring laboratory and outdoor weathering conditions.
2 Normative references There 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.
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 The test conditions were according to ISO 4892-2 [1] . 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.