| Vendor | Spec | Unit | Price | Currency | Date |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.77 | USD | 20251008 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 365.91 | USD | 20251008 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 365.91 | USD | 20250930 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.6 | USD | 20250929 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 365.74 | USD | 20250929 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 351.67 | USD | 20250929 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 351.36 | USD | 20250928 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 365.41 | USD | 20250928 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.31 | USD | 20250928 |
| Yankuang Guotai Chemical Co., Ltd. | China national standards | MT | 337.31 | USD | 20250927 |