| Vendor | Spec | Unit | Price | Currency | Date |
| Weifang Yixin Chem | China national standards | MT | 633.37 | USD | 20251011 |
| Weifang Yixin Chem | China national standards | MT | 633.37 | USD | 20251011 |
| Weifang Yixin Chem | China national standards | MT | 647.45 | USD | 20251010 |
| Weifang Yixin Chem | China national standards | MT | 646.96 | USD | 20251009 |
| Weifang Yixin Chem | China national standards | MT | 647.39 | USD | 20250930 |
| Weifang Yixin Chem | China national standards | MT | 647.08 | USD | 20250929 |
| Weifang Yixin Chem | China national standards | MT | 646.72 | USD | 20250919 |