| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 956.32 | USD | 20250922 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 956.02 | USD | 20250921 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 956.02 | USD | 20250919 |