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Net sales by product - Segment information (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disclosure of operating segments [line items] |  |  |  |
Net sales | R$ 13,295,895 | R$ 11,494,136 | R$ 24,848,816 | R$ 20,952,738
Total of products |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 24,848,816 | 20,952,738
Market pulp (1) |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 18,899,505 | 16,594,855
Printing and writing paper (2) |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 3,912,113 | 3,738,388
Paperboard |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 2,017,848 | 586,651
Other |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | R$ 19,350 | R$ 32,844
Fluff pulp |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue |  |  | 0.70% | 0.70%
Tissue |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue |  |  | 5.60% | 6.30%

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