| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1258.35 | USD | 20250721 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1258.78 | USD | 20250718 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1259.43 | USD | 20250717 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 1258.28 | USD | 20250716 |