The degree of degradation of sealants after 3500 h of exposure in a xenon-arc source weathering device and open-flame carbon-arc lamp weathering device is shown in Fig. 5 as the average of each chemical type of sealants. Accelerated weathering using the fluorescent UV lamp exposure has been started recently and no data are available to report at this stage.
Comparison between Outdoor and Accelerated Exposure
Figures 6(a)~6(d) show the degree of degradation for each extension/compression ratio as the average for each chemical type of sealant and as an average over all sealants.