| Vendor | Spec | Unit | Price | Currency | Date |
| Weifang Sutong Chem | China national standards | MT | 4230.24 | USD | 20251023 |
| Weifang Sutong Chem | China national standards | MT | 4015.61 | USD | 20251020 |
| Weifang Sutong Chem | China national standards | MT | 3985.52 | USD | 20251013 |
| Weifang Sutong Chem | China national standards | MT | 3940.61 | USD | 20251004 |
| Weifang Sutong Chem | China national standards | MT | 3996.9 | USD | 20251002 |