- LIXIL CORPORATION
- OMI MINIG CO.,LTD.
- KUROSAKI HAKUDO CO.,LTD.
- JAPAN ATOMIC ENERGY AGENCY
- INDUSTRIAL RESEARCH CENTER OF SHIGA PREFECTURE
- MIZUSAWA INDUSTRIAL CHEMICALS, LTD.
- UNION CHEMICAL CO.,LTD.
- INDUSTRIAL RESEARCH CENTER OF TOCHIGI PREFECTURE
- KUNIMINE INDUSTRIES CO.,LTD.
- TAIHEIYO CEMENT CORPORATION
- VOLCLAY JAPAN CO.,LTD
- INTERNATIONAL CLAY THERAPY ASSOCIATE
- NIHON PARKERIZING CO.,LTD.
- OBAYASHI CORPORATION
- HOYO BENTONIOTE MINING CO.,LTD.
- KATAKURA & CO-OP AGRI CO., LTD
- INDUSTRIAL RESEARCH CENTER OF SHIMANE PREFECTURE
- SHOKOZAN MINING CO.,LTD.
- BODY CLAY CO.,LTD.
- JAPAN PETROLEUM EXPLOTATION CO., LTD.
- KUBOTA CORPORATION
- JAPAN ACTIVATED CLAY CO.,LTD.
- KANKYO ZAIRYO ENGINEERING Co., Ltd.
- HOJUN CO.,LTD.
- TODAKOGYO CORPORATION
- JAPAN POLYCHEM CORPORATION
- TOPY INDUSTRIES LIMITED
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