| Vendor | Spec | Unit | Price | Currency | Date |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 846.69 | USD | 20251030 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 845.45 | USD | 20251016 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 845.13 | USD | 20251015 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 844.42 | USD | 20250930 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 844.01 | USD | 20250929 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 843.27 | USD | 20250926 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 844.39 | USD | 20250925 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 844.39 | USD | 20250924 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 843.81 | USD | 20250922 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 843.55 | USD | 20250919 |