| Vendor | Spec | Unit | Price | Currency | Date |
| Zibo HUI BAO Chemical Co., Ltd. | China national standards | MT | 1617.69 | USD | 20250929 |
| Zibo HUI BAO Chemical Co., Ltd. | China national standards | MT | 1618.42 | USD | 20250925 |
| Zibo HUI BAO Chemical Co., Ltd. | China national standards | MT | 1618.42 | USD | 20250924 |
| Zibo HUI BAO Chemical Co., Ltd. | China national standards | MT | 1617.3 | USD | 20250922 |
| Zibo HUI BAO Chemical Co., Ltd. | China national standards | MT | 1616.8 | USD | 20250920 |
| Zibo HUI BAO Chemical Co., Ltd. | China national standards | MT | 1617.78 | USD | 20250918 |