| Vendor | Spec | Unit | Price | Currency | Date |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.76 | USD | 20250915 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.94 | USD | 20250913 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.94 | USD | 20250912 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.89 | USD | 20250908 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.72 | USD | 20250906 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.78 | USD | 20250904 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.51 | USD | 20250903 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.6 | USD | 20250902 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.69 | USD | 20250901 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.89 | USD | 20250830 |