| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1239.31 | USD | 20251013 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1238.6 | USD | 20251011 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1238.6 | USD | 20251010 |