| Vendor | Spec | Unit | Price | Currency | Date |
| Zibo Xintai Chem | China national standards | MT | 902.29 | USD | 20250928 |
| Zibo Xintai Chem | China national standards | MT | 907.72 | USD | 20250925 |
| Zibo Xintai Chem | China national standards | MT | 910.54 | USD | 20250924 |
| Zibo Xintai Chem | China national standards | MT | 916.94 | USD | 20250922 |