| No. | Name of reference material producer | Accreditation number |
| 1. | Quality Analysis Department, PTT Oil and Retail Business Public Company Limited | RMP-0001 |
| 2. | Cereal grain Reference Material Producer, Thai Calibration Services Co., Ltd. | RMP-0002 |
| 3. | Reference Material Producers, Research and Development Section, Chemical Innovation Company Limited | RMP-0003 |