W. R. Grace & Co. (NYSE: GRA) announced today that it has acquired Rheoset Industria e Comercio de Aditivos Ltda. (“Rheoset”). Rheoset is a leading manufacturer of concrete admixtures in Brazil. Financial terms of the transaction were not disclosed. Rheoset specializes in quality concrete admixtures based on proprietary, value-added concrete technologies that enhance the performance of concrete and contribute to higher quality, longer lasting structures. These technologies help customers across the value chain achieve efficient production and enhanced productivity. This acquisition adds manufacturing capacity at Rio de Janeiro and Recife, complementing Grace’s existing operations at Sorocaba and Bahia. “Rheoset’s product lines are highly complementary to Grace’s concrete admixture product and technology portfolio,” said Craig Merrill, Vice President and General Manager, Americas for Grace Construction Products, a business segment of Grace. “The acquisition will accelerate the pace of product and technology development, enabling the more rapid creation of new customer solutions and new value in this segment.” Andrew Bonham, President of Grace Construction Products adds, “This acquisition is part of Grace’s strategy of growth in high margin segments, investing in manufacturing capacity to serve emerging regions, and extending the Grace brand in our core business segments.” About Grace Grace is a leading global supplier of catalysts; engineered and packaging materials; and, specialty construction chemicals and building materials. The company’s three industry-leading business segments—Grace Catalysts Technologies, Grace Materials Technologies and Grace Construction Products—provide innovative products, technologies and services that enhance the quality of life. Grace employs approximately 6,000 people in over 40 countries and had 2011 net sales of $3.2 billion. More information about Grace is available at www.grace.com. About Grace Construction Products Grace Construction Products is a world-leading provider of construction chemicals and building materials that are used to enhance the durability, strength, and appearance of structures all over the world. Products include concrete admixtures, fibers, surface treatments and liquid pigments, additives for cement processing and fire protection, waterproofing and masonry products. More information is available online at www.graceconstruction.com. This announcement contains forward-looking statements, that is, information related to future, not past, events. Such statements generally include the words “believes,” “plans,” “intends,” “targets,” “will,” “expects,” “suggests,” “anticipates,” “outlook,” “continues” or similar expressions. Forward-looking statements include, without limitation, all statements regarding Grace’s Chapter 11 case; expected financial positions; results of operations; cash flows; financing plans; business strategy; budgets; capital and other expenditures; competitive positions; growth opportunities for existing products; benefits from new technology and cost reduction initiatives, plans and objectives; and markets for securities. For these statements, Grace claims the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. Like other businesses, Grace is subject to risks and uncertainties that could cause its actual results to differ materially from its projections or that could cause other forward-looking statements to prove incorrect. Factors that could cause actual results to materially differ from those contained in the forward-looking statements include, without limitation: developments affecting Grace’s bankruptcy, proposed plan of reorganization and settlements with certain creditors, the cost and availability of raw materials (including rare earth) and energy, developments affecting Grace’s underfunded and unfunded pension obligations, risks related to foreign operations, especially in emerging regions, acquisitions and divestitures of assets and gains and losses from dispositions or impairments, the effectiveness of its research and development and growth investments, its legal and environmental proceedings, costs of compliance with environmental regulation and those factors set forth in Grace’s most recent Annual Report on Form 10-K, quarterly report on Form 10-Q and current reports on Form 8-K, which have been filed with the Securities and Exchange Commission and are readily available on the Internet at www.sec.gov . Reported results should not be considered as an indication of future performance. Readers are cautioned not to place undue reliance on Grace’s projections and forward-looking statements, which speak only as of the date thereof. Grace undertakes no obligation to publicly release any revision to the projections and forward-looking statements contained in this announcement, or to update them to reflect events or circumstances occurring after the date of this announcement.