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Principles of Uv Degradation

“…52 Mass loss depends not only on radiation but also on the exposure temperature. 53 At the same time, the gloss retention had an opposite trend. 29 Surface erosion usually has a positive impact on color retention of PVC.…”

“…53 Only small changes were detected because the core is not affected and the surface is continuously changed due to surface erosion process. 53 Only small changes were detected because the core is not affected and the surface is continuously changed due to surface erosion process.…”

“…There are many other manifestations of photodegradation, including molecular weight change, 27,56 change in the surface composition, 56 mass loss, 29 surface erosion, 56 gloss deterioration, 53 and change in electric properties. There are many other manifestations of photodegradation, including molecular weight change, 27,56 change in the surface composition, 56 mass loss, 29 surface erosion, 56 gloss deterioration, 53 and change in electric properties.…”

Data on Specific Polymers

“…1025 When estimates of material durability are required to be based on simulated testing, the reliability of the estimate will be highly dependent on the test method selected. 1029 Many additives are used in PVC processing. Some are active in photochemical processes.…”

Role of titanium dioxide pigments in outdoor weathering of rigid PVC

“…Published studies comparing outdoor weathering and weatherometers relevant to hot dry degradation provide some insights for the higher temperature, higher irradiance and dry climate resulting in faster gloss loss and significantly yellower colour. [11][12][13][14] Effects of stabiliser type and TiO 2 loading Figure 9a-b shows the 60ugloss loss for Ca/Zn, Pb and Sn stabilised PVC profile samples containing Ti-PureH R-105, exposed in Phoenix and Miami respectively. The trend can be found in both exposure tests.…”