| Vendor | Spec | Unit | Price | Currency | Date |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 522.0 | USD | 20251027 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.66 | USD | 20251024 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.73 | USD | 20251023 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.64 | USD | 20251021 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.33 | USD | 20251020 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.5 | USD | 20251017 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.36 | USD | 20251016 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.16 | USD | 20251015 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 520.97 | USD | 20251014 |
| Baozhen Chemical (Shandong) Co., Ltd. | China national standards | MT | 521.08 | USD | 20251013 |