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Powder coating has not yet been popularized in the present Japanese buildings. However, it has been popularized in overseas and over 10 years has been already passed from building completion. Durability of building materials has to be discussed in order to popularize in the Japanese construction industry field. Therefore, investigation into the actual conditions in overseas buildings has been executed. In this paper, the data is analyzed and the durability is discussed. A main fruit of analysis is as follows. Chalking rate and gloss retention depend on the meteorological and the coating factors. And� also, the powder coating durability in the Japanese building exterior is estimated.

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．はじめに