| Vendor | Spec | Unit | Price | Currency | Date | 
| Yixing Wencheng Chemical Co., Ltd. | China national standards | MT | 917.21 | USD | 20251103 | 
| Yixing Wencheng Chemical Co., Ltd. | China national standards | MT | 917.35 | USD | 20251028 | 
| Yixing Wencheng Chemical Co., Ltd. | China national standards | MT | 915.84 | USD | 20251020 |