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SEGMENT INFORMATION - Net sales by product (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net sales by products |  |  |
NET SALES | R$ 26,012,950 | R$ 13,443,376 | R$ 10,580,673
Market pulp |  |  |
Net sales by products |  |  |
NET SALES | R$ 21,027,686 | R$ 8,783,274 | R$ 6,920,494
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 | R$ 4,100,502 | R$ 3,834,380 | R$ 2,265,093
Tissue |  |  |
Net sales by products |  |  |
Percentage of total net sales | 2.00% | 2.00% | 2.00%
Paperboard |  |  |
Net sales by products |  |  |
NET SALES | R$ 823,360 | R$ 764,701 | R$ 1,273,540
Others |  |  |
Net sales by products |  |  |
NET SALES | R$ 61,402 | R$ 61,021 | R$ 121,546

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