| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 559.08 | USD | 20250702 |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 559.17 | USD | 20250701 |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 558.77 | USD | 20250630 |
| Shandong Qiangsen Chemical Co., Ltd. | China national standards | MT | 558.45 | USD | 20250628 |