| Vendor | Spec | Unit | Price | Currency | Date |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1234.59 | USD | 20250721 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1235.0 | USD | 20250718 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1235.64 | USD | 20250717 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1234.52 | USD | 20250716 |
| Shandong Langcheng Chemical Co., Ltd. | China national standards | MT | 1235.0 | USD | 20250715 |