| Vendor | Spec | Unit | Price | Currency | Date |
| Jinan Dezheng Chemical Co., Ltd. | China national standards | MT | 255.96 | USD | 20250922 |
| Jinan Dezheng Chemical Co., Ltd. | China national standards | MT | 255.88 | USD | 20250920 |
| Jinan Dezheng Chemical Co., Ltd. | China national standards | MT | 260.09 | USD | 20250919 |
| Jinan Dezheng Chemical Co., Ltd. | China national standards | MT | 260.25 | USD | 20250918 |