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 third quarter of fiscal 2006, which ended June 30, 2006, on Thursday, July 27. 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 Daylight Time. The conference call will be available via webcast from www.cabotcmp.com, or by phone at 866-356-4279. Callers outside the U.S. can dial 617-597-5394. 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. Since becoming an independent public company in 2000, the company has grown to approximately 650 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. In addition to its core CMP business, the company's vision looks beyond the semiconductor industry to pursue its vision to become the world leader in shaping, enabling and enhancing the performance of surfaces. 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. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Barbara Ven Horst, Director of Investor Relations at 630-375-5412.