| Vendor | Spec | Unit | Price | Currency | Date |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.52 | USD | 20250928 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 328.87 | USD | 20250927 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.52 | USD | 20250927 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 328.87 | USD | 20250926 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.52 | USD | 20250926 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 329.31 | USD | 20250925 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.98 | USD | 20250925 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 329.31 | USD | 20250924 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.98 | USD | 20250924 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 329.31 | USD | 20250923 |