| Vendor | Spec | Unit | Price | Currency | Date |
| Henan Qingmai Environmental Protection Technology Co., Ltd. | China national standards | MT | 787.31 | USD | 20250919 |
| Henan Qingmai Environmental Protection Technology Co., Ltd. | China national standards | MT | 787.79 | USD | 20250918 |
| Henan Qingmai Environmental Protection Technology Co., Ltd. | 800 VOCs | MT | 1055.07 | USD | 20250918 |