| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 1235.37 | USD | 20250428 |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 1234.98 | USD | 20250427 |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 1234.12 | USD | 20250423 |