| Vendor | Spec | Unit | Price | Currency | Date |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.67 | USD | 20250718 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.85 | USD | 20250717 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.54 | USD | 20250716 |