CCMP CMC Materials Inc

Cabot Microelectronics Corporation (Nasdaq:CCMP), the world�s leading supplier of chemical mechanical planarization (CMP) slurries to the semiconductor industry, announced today that it will release financial results for its second quarter of Fiscal Year 2007, which ended March 31, 2007, on Thursday, April 26. The press release, which will be issued prior to market open and available in the Investor Relations section of the company�s website, www.cabotcmp.com, will be followed by a conference call at 9:00 a.m. Central Time. The conference call will be available via webcast from www.cabotcmp.com, or by phone at 866-800-8649. Callers outside the U.S. can dial 617-614-2703. The conference code for the call is 95536568. About Cabot Microelectronics Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the world's leading supplier of CMP slurries used in semiconductor and data storage manufacturing. The company's products play a critical role in the production of the most advanced semiconductor devices, enabling the manufacture of smaller, faster and more complex devices by its customers. Since becoming an independent public company in 2000, the company has grown to approximately 750 employees who work at research and development labs, sales and business offices, manufacturing facilities and customer service centers in China, France, Germany, Japan, Singapore, South Korea, Taiwan, the United Kingdom and the United States. The company's vision is to become the world leader in shaping, enabling and enhancing the performance of surfaces, and thus looks beyond its core CMP business in the semiconductor industry. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Amy Ford, Director of Investor Relations at 630-375-5412.