| Vendor | Spec | Unit | Price | Currency | Date |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.61 | USD | 20250729 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.82 | USD | 20250728 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.05 | USD | 20250725 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.21 | USD | 20250724 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.85 | USD | 20250722 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.56 | USD | 20250721 |
| 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 |