| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1324.29 | USD | 20250819 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1289.92 | USD | 20250818 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1324.98 | USD | 20250818 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1289.04 | USD | 20250815 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1324.07 | USD | 20250815 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1289.65 | USD | 20250814 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1324.7 | USD | 20250814 |