| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1414.71 | USD | 20251211 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1413.37 | USD | 20251210 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1412.97 | USD | 20251209 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1413.35 | USD | 20251203 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1413.35 | USD | 20251203 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1413.25 | USD | 20251201 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1412.65 | USD | 20251128 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1411.91 | USD | 20251125 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1410.99 | USD | 20251119 |
| Shandong Tongzhou Chemical Co., Ltd. | China national standards | MT | 1411.31 | USD | 20251118 |