| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1266.59 | USD | 20250924 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1265.72 | USD | 20250922 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1265.32 | USD | 20250921 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1265.32 | USD | 20250919 |