| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 253.32 | USD | 20250925 |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 253.32 | USD | 20250924 |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 253.32 | USD | 20250923 |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 253.14 | USD | 20250922 |
| Shandong Yihe Fine Chemical Co., Ltd. | China national standards | MT | 253.06 | USD | 20250919 |