| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 504.31 | USD | 20250820 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 623.39 | USD | 20250820 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 623.61 | USD | 20250819 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 504.49 | USD | 20250819 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 504.75 | USD | 20250818 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 504.41 | USD | 20250815 |