| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 527.38 | USD | 20250922 |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 527.22 | USD | 20250919 |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 527.54 | USD | 20250918 |