Weathering of plastics

Abstract

The current status of weathering of plastics is reviewed. As a better understanding of the effective degradative parameters of weather are obtained, it is aparent that complex interactions occur. Present laboratory exposure tests do not simulate natural conditions sufficiently to provide the much neede reliable short term exposure test for predicting long term durability. While a major step forward occurred with the introduction of filtered xwnon lamps, which simulate terrestrial sunlight both in intensity and distribution, industry‐wide support of fundamental studies of degradation is necessary if weathering studies are to be conducted scientifically.

State of the art report on durability testing of building components and materials

“…A fluorescent sunlamp-blacklamp [31] has been reported to yield accelerated aging results which correlate well with Florida and Arizona weathering of rigid polyvinyl chloride films [32]. The xenon arc light source has been used to accurately predict outdoor weathering of plastics [33].…”

Fibrose der retroperitonealen Lymphknoten beim Morbus Hodgkin ohne lymphographische Darstellung: eine mögliche Erscheinungsform

“…Besonders auffällig war die lymphographische Untersuchung. Sie wurde in typischer Weise nach Kinmonth (8) mit jeweils 7 ml Lipiodol ultrafluid von beiden Fußrücken aus durchgeführt. In der Füllungsphase stellten sich am Oberschenkel auf beiden Seiten 10-15 gut gefüllte normale Lymphgefäße dar.…”