Magnesita Refratarios : Extraordinary General Meeting Call Notice

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

NOTICE FOR SPECIAL GENERAL SHAREHOLDERS' MEETING

The shareholders of Magnesita Refratários S.A. ("Company") are invited, pursuant to the Company's Bylaws, to the Special General Shareholders' Meeting to be held on November 30th, 2017, at 12:00 a.m., at the Company's headquarters in the City of Contagem, State of Minas Gerais, at Praça Louis Ensch, no. 240, Cidade Industrial, Zip Code No. 32210-050, to resolve the following agenda:

(i) To approve the appointment of a list of three appraisal companies to draft an appraisal report on the economic value of the Company's common shares, with regard to an possible public offering of acquisition of all Company's common shares in the market free float, in order to terminate the registration of the Company as a publicly-held company and to withdraw the Novo Mercado segment, pursuant to articles 4th, Paragraph 4th of the Brazilian Corporate Law, CVM Instruction No. 361, dated as March 5, 2002 and the Novo Mercado Listing Rules;

1. Election of the Board of Directors members and their respective alternates;

2. To approve the amendment to Article 5 of the Bylaws of the Company in order to reflect the current number of shares that compose the capital stock, under the terms approved by the Board of Directors at a meeting held on 10.11.2017; as well as to approve the consolidation of the Bylaws of the Company

General Instructions:

We hereby disclose that 5% (five percent) is the minimum percentage required in order to shareholders to summon Multiple Voting, under the terms of Article 141, Law No. 6.404/76 and ICVM No. 165/91, amended by ICVM 282/98. As per Article 141, §1º, of Law No. 6.404/76, the shareholder that holds the minimal percentage hereon informed and desires to summon Multiple Voting shall inform its intentions up to 48 (forty eight) hours prior the Annual and Special Shareholders Meeting, by means of letter addressed to Company's Investors Relations Office (Rua Dr. Eduardo de Souza Aranha, 387, 5th floor, São Paulo, SP, CEP 05421-000).

All the documents related to agenda are available to the shareholders at the Company's main office and on the websites of the Brazilian Securities and Exchange Commission - CVM (www.cvm.gov.br) and of BM&FBOVESPA S.A. - Bolsa de Valores, Mercadorias e Futuros (www.bmfbovespa.com.br), including the following documents: (i) the Management Proposal; and (ii) Notice for Special General Shareholders' Meeting.

Shareholders shall submit at the Company's main office, at least forty-eight (48) hours in advance: (i) supporting documents from the depositary financial institution of their book entry shares or shares in custody; and (ii) if applicable, a duly completed and signed power of attorney for representation of the shareholder by proxy, in accordance with the effective legislation and the Bylaws.

The resolution on item (i) of the Agenda will depend on the presence at the first general meeting of shareholders representing at least 20% (twenty percent) of the total shares issued by the Company, except for shares held by the controlling shareholder, by persons related to it, by the Company's officers, and those in treasury ("Outstanding Shares"). Such subject shall be approved by a majority of votes of the shareholders representing the Outstanding Shares present at the meeting. In case a

minimum quorum of presence is not obtained, the subject may be resolved on second call, at a general meeting that may count on the presence of any number of shareholders representing the Outstanding Shares.

Contagem, October 31st, 2017.

Octavio Cortes Pereira Lopes

Chairman of the Board of Directors