| Vendor | Spec | Unit | Price | Currency | Date |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 825.22 | USD | 20250801 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 811.26 | USD | 20250731 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 811.86 | USD | 20250730 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 811.56 | USD | 20250728 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 812.17 | USD | 20250723 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 811.21 | USD | 20250719 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 811.21 | USD | 20250718 |