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In introducing the new fuel to the market, standardization of fuel quality is mandatory. As the international distribution of DME fuel including household use became highly conceivable, from 2007, DME became a subject in SC4 and SC5 of the ISO/ TC28 (the technical committees for LNG and LPG). For the SC5 that discusses the sampling and measurement methods for international distribution, Japan was the secretariat (secretary: Nippon Kaiji Kentei Kyokai). For the SC4 in charge of DME quality, the secretariat was France (secretary TOTAL). Under the French secretariat, the DME quality standard was organized jointly with Japan, which was the only country in 2007 that had already defined the DME quality as industrial and power generation fuel (TS K0011, published November 2005). Japan actively dispatched experts to the ISO/TC28/ SC4/WG13 [Classification and specifications of commercial dimethyl ether (DME)], WG14 [Joint project with TC28 on “Test methods for dimethyl ether (DME)”], SC5/WG3 (Procedures for measurement and calculation of refrigerated fluids), and WG4 (Sampling of refrigerated fluids). The author participated as an expert in these working groups. In July 2011, the author was appointed as convener of SC4/WG13 following the retirement of the French convener.

Standardization of dimethyl ether (DME) fuel specifications