| Vendor | Spec | Unit | Price | Currency | Date |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.16 | USD | 20250804 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.68 | USD | 20250801 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.69 | USD | 20250731 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 335.94 | USD | 20250730 |
| 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 |