| Vendor | Spec | Unit | Price | Currency | Date |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.89 | USD | 20250829 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.73 | USD | 20250828 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.51 | USD | 20250827 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.14 | USD | 20250826 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.26 | USD | 20250825 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.51 | USD | 20250822 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.67 | USD | 20250821 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.21 | USD | 20250820 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.33 | USD | 20250819 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 336.5 | USD | 20250818 |