Weatherability of Polypropylene by Accelerated Weathering Tests and Outdoor Exposure Tests in Japan

Abstract

, carried out from 2010 to 2012, polyethylene reference sample (PE-RS) pieces and six types of polypropylene (PP) were subjected to accelerated weathering tests and outdoor exposure tests, resulting in the following findings. (1) The PE-RS was subjected to eight 100 h exposure tests in the same test machine. The accelerated weathering test machines of the participating institutes had high reproducibility. (2) The PE-RS CI values were greater when the temperature in the chamber was greater during accelerated weathering tests, and there was a high correlation with the average temperature in the outdoor exposure tests at 20 places in Japan. (3) By comparing the change in PP strength by normalizing the degradation environment using the PE-RS CI values, the accelerated weathering test with results showing the highest correlation with the outdoor exposure test results was the one with the xenon arc lamp at an irradiance of 60 W/m 2 and a BPT of 63 ∘ C.

Feasibility of Reusing Surgical Mask Under Different Disinfection Treatments

“…UVC did not damage the filtration layer even the exposure time was up to 90 minutes. Although UVC is proven to facilitate the degradation of polypropylene, short exposure targeted for disinfection of masks would not cause significant structural damage to the filtration layer [12].…”

Temperate UV-Accelerated Weathering Cycle Combined with HT-GPC Analysis and Drop Point Testing for Determining the Environmental Instability of Polyethylene Films

“…One example recently studied was the SLP of polymers used as high-voltage insulators on overhead electric power cables for trains in India [ 16 ]. More specifically to polyolefins, studies have been conducted that have shown the correlation between the durability of polypropylene in laboratory accelerated weathering compared to outdoor exposure in different regions of China [ 17 ] and Japan [ 18 ]. The correlation between the accelerated weathering of polyolefins in a laboratory and real-world outdoor exposure is critical to validate the performance of the polyolefin when used in a real-world application.…”

Correlation of a Temperate UV-Weathering Cycle to Outdoor Exposure for the Determination of the Environmental Instability of Polyethylene Films Using HT-GPC Analysis

“…Moreover, standards governing the outdoor exposure methodologies for plastics, such as ASTM G113 [ 7 ], state that indoor accelerated tests should match results obtained through outdoor exposure. To this end, recent studies have been conducted that have shown the correlation between the durability of polypropylene in laboratory accelerated weathering compared to outdoor exposure in different regions of China [ 8 ] and Japan [ 9 ]. Furthermore, similar correlated studies have been conducted on polymers used as high-voltage insulators on overhead electric power cables for trains in India [ 10 ].…”