| Vendor | Spec | Unit | Price | Currency | Date |
| Qingdao Chengxin Chem | China national standards | MT | 536.12 | USD | 20251031 |
| Qingdao Chengxin Chem | China national standards | MT | 536.24 | USD | 20251030 |
| Qingdao Chengxin Chem | China national standards | MT | 535.45 | USD | 20251016 |
| Qingdao Chengxin Chem | China national standards | MT | 535.25 | USD | 20251015 |