| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 770.5 | USD | 20250808 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 784.51 | USD | 20250808 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 784.92 | USD | 20250807 |
| Shandong Yeyang Chemical Co., Ltd. | China national standards | MT | 770.9 | USD | 20250807 |