| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1406.35 | USD | 20250922 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1405.92 | USD | 20250919 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1406.77 | USD | 20250918 |