| Vendor | Spec | Unit | Price | Currency | Date |
| Weifang Yixin Chemical Co., Ltd. | China national standards | MT | 1757.94 | USD | 20250922 |
| Weifang Yixin Chemical Co., Ltd. | China national standards | MT | 1785.51 | USD | 20250919 |
| Weifang Yixin Chemical Co., Ltd. | China national standards | MT | 1871.0 | USD | 20250918 |