| Vendor | Spec | Unit | Price | Currency | Date |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1058.13 | USD | 20251031 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1058.37 | USD | 20251030 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1056.81 | USD | 20251016 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1056.41 | USD | 20251015 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1055.52 | USD | 20250930 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1055.02 | USD | 20250929 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1054.08 | USD | 20250928 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1054.08 | USD | 20250926 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1055.49 | USD | 20250925 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 1055.49 | USD | 20250924 |