Japan has two biodiesel fuel standards. One is mandatory (specified in the Law on the Quality Control of Gasoline and Other Fuels, known as the Quality Assurance Law) and the other is voluntary (the Japanese Industrial Standard, or JIS). Recently, the Quality Assurance Law was amended to allow up to five percent Fatty Acid Methyl Esters (FAME) by mass and to prevent producers from using unprocessed vegetable oils. The changes will take effect next March. For the JIS, the big difference between European and Japanese biodiesel standards is that Japan limits biodiesel content to five percent as a blended fuel (no B100 allowed). Detailed tables describing the fuel content can be found here.