| Vendor | Spec | Unit | Price | Currency | Date |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 690.45 | USD | 20251016 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 690.19 | USD | 20251015 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 689.61 | USD | 20250930 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 689.28 | USD | 20250929 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 688.67 | USD | 20250928 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 688.67 | USD | 20250926 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 689.59 | USD | 20250925 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 689.59 | USD | 20250924 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 689.11 | USD | 20250922 |
| Qingdao Chengxin Hongfeng Chemical Co., Ltd. | China national standards | MT | 688.9 | USD | 20250919 |