| Vendor | Spec | Unit | Price | Currency | Date |
| Yixing Wencheng Chem | Industrial Grade | MT | 508.73 | USD | 20251208 |
| Yixing Wencheng Chem | Industrial Grade | MT | 507.99 | USD | 20251103 |
| Yixing Wencheng Chem | Industrial Grade | MT | 508.07 | USD | 20251028 |
| Yixing Wencheng Chem | Industrial Grade | MT | 507.24 | USD | 20251020 |