| Vendor | Spec | Unit | Price | Currency | Date |
| Yixing Wencheng Chem | China national standards | MT | 918.55 | USD | 20251208 |
| Yixing Wencheng Chem | China national standards | MT | 918.95 | USD | 20251204 |
| Yixing Wencheng Chem | China national standards | MT | 917.21 | USD | 20251103 |
| Yixing Wencheng Chem | China national standards | MT | 917.35 | USD | 20251028 |
| Yixing Wencheng Chem | China national standards | MT | 915.84 | USD | 20251020 |