| Vendor | Spec | Unit | Price | Currency | Date |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 329.09 | USD | 20250922 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.74 | USD | 20250922 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.64 | USD | 20250920 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 328.98 | USD | 20250920 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 328.98 | USD | 20250919 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.64 | USD | 20250919 |
| Hebei Pengfa Chemcal Co., Ltd. | China national standards | MT | 341.84 | USD | 20250918 |