MATERIAL FACT

Publicly-Held Company

São Paulo, May 21, 2008.

TRISUL S.A, in addition to the material fact of Buyback Program of the common shares issued by the Company released on April 18, 2008, according to CVM´s (Securities and Exchange Commission of Brazil) request, the Company has to clarify that the Board of the Company has authorized the purchase of up to 3,036,555 its common shares, representing up to 10% of the shares on the market. The acquisition will be made with the reserves available in the Shareholders´ Equity reserves, not exceeding the amount available in the Reserves Accounts destined for this purpose, which was R$18,103,000.00 (Eighteen million, one hundred and three thousand Reais) as of December 31, 2007.

Rebeca Ouro-Preto
Investor Relations Director
Information request, please contact:
Trisul S.A. – Investor Relations
Phone.: (55 11) 3147-0149
E-mail: ri@trisul-sa.com.br
www.trisul-sa.com.br/ir

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Last Update on May 21, 2008