Material Fact

Magnesita Refratários S.A. (“Company”), pursuant to the terms of Law no. 6,404/76 and Rule no. 358/02 of Comissão de Valores Mobiliários (“CVM”), hereby informs its shareholders and the market in general, in connection with the transaction disclosed in the Material Fact dated October 5, 2016, by which Alumina Holdings, LLC (“Alumina”), Rearden L. Holdings 3 S.À R.L. (“Rearden”) and RHI AG (“RHI”) signed an agreement with the purpose of combining the operations of RHI and the Company to create a leading company in refractory solutions (“Transaction”), and in addition to information disclosed in the Material Fact dated June 28, 2017 and July 11, 2017:

On the date hereof, another important condition precedent for the conclusion of the Transaction was obtained, with more than 99.7% of RHI shareholders voting in favor of the Transaction, in the Extraordinary Shareholders’ Meeting held in Vienna today. Such approval includes the migration of RHI to the Netherlands and other organizational changes. Additionally, the requirement that RHI’s shareholders should not exceed statutory withdrawal rights in an amount of more than € 70 million has been met. For more details, please see: https://www.rhi-ag.com/internet_en/investor_relations_en/108076/04.08.17_Beschlussvorschlaege_HV_2017l.html

The next step fot the completion of the Transaction includes the admission of RHI Magnesita shares in the premium segment of the Official List on the Main Market of the London Stock Exchange, which is expected for October 2017.

The Company will keep its shareholders and the market in general informed on the developments of the Transaction.