| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Hezhan Chemical Co., Ltd. | China national standards | MT | 317.6 | USD | 20251029 |
| Shandong Hezhan Chemical Co., Ltd. | China national standards | MT | 302.95 | USD | 20251016 |
| Shandong Hezhan Chemical Co., Ltd. | China national standards | MT | 306.83 | USD | 20251011 |
| Shandong Hezhan Chemical Co., Ltd. | China national standards | MT | 294.29 | USD | 20250819 |