| Vendor | Spec | Unit | Price | Currency | Date |
| Yixing Wencheng Chemical Co., Ltd. | China national standards | MT | 931.32 | USD | 20251103 |
| Yixing Wencheng Chemical Co., Ltd. | China national standards | MT | 931.47 | USD | 20251028 |
| Yixing Wencheng Chemical Co., Ltd. | China national standards | MT | 929.93 | USD | 20251020 |