| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1200.75 | USD | 20251129 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1200.92 | USD | 20251127 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1200.12 | USD | 20251125 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1199.29 | USD | 20251123 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1199.29 | USD | 20251122 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1199.35 | USD | 20251119 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1199.62 | USD | 20251118 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1242.5 | USD | 20251116 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1270.74 | USD | 20251115 |
| Shandong Daoqin Chemical Co., Ltd. | China national standards | MT | 1270.74 | USD | 20251114 |