| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1050.49 | USD | 20250804 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1134.53 | USD | 20250804 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1132.93 | USD | 20250801 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1049.01 | USD | 20250801 |