Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Artificial weathering procedures for plastics glazing materials
Transparent or translucent plastics glazing materials are of light weight, tough, easily formed into complex shapes and transmit light well. This useful combination of properties allows widespread use in construction, for example as rooflights. However, the plastics used are more susceptible to degradation by weathering than the traditionally used glass, notably the combined effects of ultraviolet light, heat and moisture. Complete inhibition of degradation is not possible but the general world trend to an increase in the use of plastics in external applications has led to the development of many new products which improve stability and increase component service life. However, examples of unacceptable durability have been seen in practice, particularly when high operating temperatures in sunlight occur. Hence the need for reliable artificial weathering tests to assess proposed combinations of plastics glazing materials in a reasonably short time. The procedures described in this paper take account of the revisions currently proposed in ISO/TC61 for ISO 4892: Plastics — Methods of Exposure to Laboratory Light Sources, including Part 2: Xenon Arc Sources and Part 3: Fluorescent uv Lamps. In conducting these tests particular consideration is given to the control and effects of sample temperature. Test procedures are assessed for their degradative effects on commercial glazing materials of polyvinylchloride, acrylic and polycarbonate, including examples of surface-coated and thermoformed sheets. Procedures based on xenon arc sources appear to be most generally applicable because the full solar wavelength range is needed to promote the effects observed in practice. The method of mounting strongly influences the temperature of transparent test pieces and thus the test results, enabling the temperature sensitivity of materials and products to be investigated.
Artificial weathering procedures for plastics glazing materials
Transparent or translucent plastics glazing materials are of light weight, tough, easily formed into complex shapes and transmit light well. This useful combination of properties allows widespread use in construction, for example as rooflights. However, the plastics used are more susceptible to degradation by weathering than the traditionally used glass, notably the combined effects of ultraviolet light, heat and moisture. Complete inhibition of degradation is not possible but the general world trend to an increase in the use of plastics in external applications has led to the development of many new products which improve stability and increase component service life. However, examples of unacceptable durability have been seen in practice, particularly when high operating temperatures in sunlight occur. Hence the need for reliable artificial weathering tests to assess proposed combinations of plastics glazing materials in a reasonably short time. The procedures described in this paper take account of the revisions currently proposed in ISO/TC61 for ISO 4892: Plastics — Methods of Exposure to Laboratory Light Sources, including Part 2: Xenon Arc Sources and Part 3: Fluorescent uv Lamps. In conducting these tests particular consideration is given to the control and effects of sample temperature. Test procedures are assessed for their degradative effects on commercial glazing materials of polyvinylchloride, acrylic and polycarbonate, including examples of surface-coated and thermoformed sheets. Procedures based on xenon arc sources appear to be most generally applicable because the full solar wavelength range is needed to promote the effects observed in practice. The method of mounting strongly influences the temperature of transparent test pieces and thus the test results, enabling the temperature sensitivity of materials and products to be investigated.
Artificial weathering procedures for plastics glazing materials
Halliwell, S.M. (Autor:in) / Gardiner, D. (Autor:in)
Construction and Building Materials ; 8 ; 233-241
01.01.1994
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Artificial weathering procedures for plastics glazing materials
| British Library Online Contents | 1994
Artificial weathering procedures for plastics glazing materials
| Online Contents | 1994
| British Library Conference Proceedings | 1993
TIBKAT | 1998
British Library Online Contents | 1998