| Achilles Corporation | Nippon Mukj Co., Ltd. |
| Arisawa Manufacturing Co., Ltd. | Nippon Sheet Glass Co., Ltd. |
| Asahi Fiberglass Co., Ltd. | Nippon Silica Glass Co., Ltd. |
| Asahi Glass Co., Ltd. | Nitta Industries Corp. |
| Aso Cement Co., Ltd. | Nok Corporation |
| Bando Chemical Industries Ltd. | Noritake Co., Limited |
| Bridgestone Corporation | Saint-Gobain Norton Kk. |
| Chichibu Onoda Cement Corporation | Sakura Rubber Company Ltd. |
| Fujimi Inc. | Sanwa Kenma Kogyo Co., Ltd. |
| Inax Corporation | Sec Corporation |
| Inoac Corporation | Sumitomo Metal (Smi) Electronics Devices Inc. |
| Kinsei Matec Co., Ltd. | Sumitomo Osaka Cement Co., Ltd. |
| Krosaki Harima Corporation | Sumitomo Rubber Industries |
| Lafarge(法国拉法基) | Taiheiyo Cement Corporation |
| Michelin Okamoto Tire Co. | The Ohtsu Tire & Rubber Co., Ltd. |
| Molten Co. | The Yokohama Rubber Co., Ltd. |
| Narasaki Sangyo Co., Ltd. | Tokai Carbon Co., Ltd. |
| Ngk Insulators, Ltd. | Tokai Rubber Industries, Ltd. |
| Ngk Spark Plug Co., Ltd. | Toshiba Ceramics Co., Ltd. |
| Nichias Corporation | Toto Ltd. |
| Nihon Cement Co., Ltd. | Toyo Glass Co., Ltd. |
| Nihon Yamamura Glass Co., Ltd. | Toyo Tire & Rubber Co., Ltd. |
| Nippon Electric Glass | Yoshino Gypsum Co., Ltd. |
| Nippon Glass Fiber Co., Ltd. |
