International standards are international arrangements for product quality, performance, safety, dimensions, test / inspection methods and so on. Since the ISO solid biofuels was first published in 2014 by ISO/TC 238, the number of the documents has reached 45. Some of the standards are being subjected to systematic review, done in every five years. In such a situation, the domestic committee for TC 238 was established in early 2021. However, Japan has been an O member, and therefore no right to participate ISO standards for solid biofuels. In this paper, the authors will discuss the issues for Japan to participate TC 238, introducing revision of the ISO standards for solid biofuels and the differences between ISO and the domestic voluntary standards.
