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RELATED PARTIES - Balances recognized in assets and liabilities (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
RELATED PARTIES
Balances receivable (payable)	R$ 55,994	R$ 21,283
Trade accounts receivable
RELATED PARTIES
Balances receivable (payable)	47,685	23,760
Other accounts receivable
RELATED PARTIES
Balances receivable (payable)	11,163
Trade accounts payable
RELATED PARTIES
Balances receivable (payable)	(2,849)	(2,477)
Other accounts payable
RELATED PARTIES
Balances receivable (payable)	(5)
Transactions with controlling shareholders
RELATED PARTIES
Balances receivable (payable)	3	3
Suzano Holding S.A.
RELATED PARTIES
Balances receivable (payable)	3	3
Transactions with companies of the Suzano Group and other related parties
RELATED PARTIES
Balances receivable (payable)	55,991	21,280
Management | Reimbursement for expenses
RELATED PARTIES
Balances receivable (payable)	(5)	(1)
Bexma Participacoes Ltda. | Reimbursement for expenses
RELATED PARTIES
Balances receivable (payable)	1	1
Bizma Investimentos Ltda. | Reimbursement for expenses
RELATED PARTIES
Balances receivable (payable)	1	1
Ensyn Technologies | Reimbursement for expenses
RELATED PARTIES
Balances receivable (payable)	2,829
Ibema Companhia Brasileira de Papel | Sale of pulp
RELATED PARTIES
Balances receivable (payable)	47,685	23,755
Ibema Companhia Brasileira de Papel | Sale of other products
RELATED PARTIES
Balances receivable (payable)	695
Ibema Companhia Brasileira de Papel | Purchase of products
RELATED PARTIES
Balances receivable (payable)	(2,834)	(2,467)
Ibema Companhia Brasileira de Papel | Dividends receivable
RELATED PARTIES
Balances receivable (payable)	6,415
Ibema Companhia Brasileira de Papel | Interest on shareholders' equity
RELATED PARTIES
Balances receivable (payable)	1,218
Instituto Ecofuturo - Futuro Para o Desenvolvimento Sustentavel | Social services
RELATED PARTIES
Balances receivable (payable)	1	R$ (9)
Nemonorte Imoveis e Participacoes Ltda. | Real estate advisory
RELATED PARTIES
Balances receivable (payable)	R$ (15)

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