| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 605.16 | USD | 20250915 |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 602.2 | USD | 20250811 |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 587.23 | USD | 20250721 |