| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Laya Chemical Co., Ltd. | China national standards | MT | 742.95 | USD | 20250814 |
| Shandong Laya Chemical Co., Ltd. | China national standards | MT | 742.82 | USD | 20250813 |
| Shandong Laya Chemical Co., Ltd. | China national standards | MT | 742.11 | USD | 20250812 |