| Vendor | Spec | Unit | Price | Currency | Date |
| Jiangsu SOPO Chemical Co., Ltd. | China national standards | MT | 419.45 | USD | 20250721 |
| Jiangsu SOPO Chemical Co., Ltd. | China national standards | MT | 419.59 | USD | 20250718 |
| Jiangsu SOPO Chemical Co., Ltd. | China national standards | MT | 419.81 | USD | 20250717 |
| Jiangsu SOPO Chemical Co., Ltd. | China national standards | MT | 419.43 | USD | 20250716 |