| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 1086.71 | USD | 20251028 |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 1085.21 | USD | 20251022 |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 985.14 | USD | 20250915 |
| Shandong Chengshuo Chemical Co., Ltd. | China national standards | MT | 980.32 | USD | 20250811 |