| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Huize Chemical Technology Co., Ltd. | China national standards | MT | 294.25 | USD | 20250916 |
| Shandong Huize Chemical Technology Co., Ltd. | China national standards | MT | 294.13 | USD | 20250915 |
| Shandong Huize Chemical Technology Co., Ltd. | China national standards | MT | 294.0 | USD | 20250902 |
| Shandong Huize Chemical Technology Co., Ltd. | China national standards | MT | 293.59 | USD | 20250826 |