MAGNESITA REFRATÁRIOS S.A.

Publicly-Held Company

CNPJ/MF (Corporate Taxpayer Registration) No. 08.684.547/0001-65 NIRE (Commercial Registration) 31.300.026.485

MINUTES OF THE BOARD OF DIRECTORS' MEETING HELD ON MAY 9, 2017

Date, Time and Place: On May 9, 2017, at 9 a.m., at the branch office of Magnesita Refratários S.A. ("Company"), located in the City of São Paulo, State of São Paulo, at Rua Dr. Eduardo Souza Aranha, 387, 5thfloor, Vila Nova Conceição, ZIP Code 04543-121.

Notice of the Meeting, Attendance and Agenda: The members of the Company's Board of Directors were duly summoned on May 4th, 2017, pursuant to article 16, §1st of the Company's Bylaws. The totality of the members of the Board of Directors attended the meeting. The agenda was set out in the call notice.

Chairman and Secretary: Chairman - Octavio Cortes Pereira Lopes

Secretary - Livia Mariz Junqueira

Resolutions: The following resolutions were adopted by unanimous vote of the members of the Board of Directors:

  1. To authorize these minutes to be drawn up in summary form; and

  2. To approve results of the first quarter of 2017 of the Company.

Conclusion and Approval of the Minutes: There being no further business, the meeting was briefly adjourned while these minutes were drawn up. The meeting was again called to order, whereupon these minutes, after being read and approved, were signed by the Chairman and Secretary of the meeting and the members of the Board of Directors of the Company. Chairman: Octavio Cortes Pereira Lopes. Secretary: Livia Mariz Junqueira. Members of the Board of Directors: Octavio Cortes Pereira Lopes; Fersen Lamas Lambranho; Thiago Emanuel Rodrigues; Lucas Álvares Martín Garrido; Nelson Rozental; Franz-Ferdinand Buerstedde; Luiz Alves Paes de Barros; Bernardo Guimarães Rodarte; Ronaldo de Carvalho Caselli.

I declare that these minutes are a true copy of the original drawn up in the relevant book.

São Paulo/SP, May 9, 2017.

LIVIA MARIZ JUNQUEIRA

Secretary

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