| Vendor | Spec | Unit | Price | Currency | Date |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 819.66 | USD | 20250815 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 820.05 | USD | 20250814 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 819.9 | USD | 20250813 |
| Qingdao Shengze Chemical Co., Ltd. | China national standards | MT | 819.12 | USD | 20250812 |