| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Hongyang Chemical Co., Ltd. | China national standards | MT | 668.48 | USD | 20250923 |
| Shandong Hongyang Chemical Co., Ltd. | China national standards | MT | 668.02 | USD | 20250922 |
| Shandong Hongyang Chemical Co., Ltd. | China national standards | MT | 667.81 | USD | 20250919 |
| Shandong Hongyang Chemical Co., Ltd. | China national standards | MT | 668.21 | USD | 20250918 |