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Information by Segment and Geographic Areas - Paper net sales by product (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales by products |  |  |
Net sales revenue | R$ 13,443,376 | R$ 10,580,673 | R$ 9,839,162
Percentage of total net sales | 100.00% | 100.00% | 100.00%
Market pulp |  |  |
Net sales by products |  |  |
Net sales revenue | R$ 8,783,274 | R$ 6,920,494 | R$ 6,144,123
Fluff pulp |  |  |
Net sales by products |  |  |
Percentage of total net sales | 1.00% | 1.00% | 1.00%
Printing and writing paper |  |  |
Net sales by products |  |  |
Net sales revenue | R$ 3,834,380 | R$ 2,265,093 | R$ 2,233,995
Tissue | Maximum |  |  |
Net sales by products |  |  |
Percentage of total net sales | 3.50% | 3.50% | 3.50%
Paperboard |  |  |
Net sales by products |  |  |
Net sales revenue | R$ 764,701 | R$ 1,273,540 | R$ 1,357,829
Others |  |  |
Net sales by products |  |  |
Net sales revenue | R$ 61,021 | R$ 121,546 | R$ 103,215

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