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Surface temperatures of irradiated test specimens - decisive physical quantities and a largely unsolved problem

  • Temperature is an important parameter in weathering tests. In many (photo-)chemical degradation processes a Variation of the specimen temperature by A t = + 1 °C can cause a Variation of AP(property change) by ± 8%. Since the early eighties it is well known that some types of black panel thermometers can show temperatures that are far below the maximum surface temperature of a black specimen. Although, there were precise requirements for the black coating of the BPT, a replacement by a white coating - depending on the design of the BPT - did not really change the temperature shown by the thermometer. There was no correlation between the BPT and the specimen surface temperature. In Europe and later at ISO the so-called black- and white-standard thermometers BST/WST were introduced. Now, there are BST and WST (ISO) and there are thermally uninsulated and insulated BPT and WPT (ASTM), partly for artificial or for outdoor exposure. And there are other adventurous procedures to determineTemperature is an important parameter in weathering tests. In many (photo-)chemical degradation processes a Variation of the specimen temperature by A t = + 1 °C can cause a Variation of AP(property change) by ± 8%. Since the early eighties it is well known that some types of black panel thermometers can show temperatures that are far below the maximum surface temperature of a black specimen. Although, there were precise requirements for the black coating of the BPT, a replacement by a white coating - depending on the design of the BPT - did not really change the temperature shown by the thermometer. There was no correlation between the BPT and the specimen surface temperature. In Europe and later at ISO the so-called black- and white-standard thermometers BST/WST were introduced. Now, there are BST and WST (ISO) and there are thermally uninsulated and insulated BPT and WPT (ASTM), partly for artificial or for outdoor exposure. And there are other adventurous procedures to determine surface temperatures. The different types of thermometers and different procedures will be discussed and it will be shown that there is no procedure which establishes a correlation between outdoor surface temperatures and surface temperatures in artificial exposure tests.zeige mehrzeige weniger

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Metadaten
Autor*innen:P. Trubiroha, Anja Geburtig, Volker WachtendorfORCiD
Persönliche Herausgeber*innen:T. Reichert
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):6th European weathering symposium Natural and artificial ageing of polymers
Jahr der Erstveröffentlichung:2013
Herausgeber (Institution):Gesellschaft für Umweltsimulation e.V. (GUS)
Ausgabe/Heft:16
Erste Seite:185
Letzte Seite:194
Veranstaltung:6th European weathering symposium Natural and artificial ageing of polymers
Veranstaltungsort:Bratislava, Slovak Republic
Beginndatum der Veranstaltung:11.09.2013
Enddatum der Veranstaltung:13.09.2013
ISBN:978-3-9813136-8-0
Bemerkung:
Serientitel: CEEES Publication – Series title: CEEES Publication
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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