CCMP CMC Materials Inc

Cabot Microelectronics Corporation (Nasdaq: CCMP), the world's leading supplier of chemical mechanical planarization (CMP) polishing slurries and a growing CMP pad supplier to the semiconductor industry, announced today that it is scheduled to present at the 14th Annual Kaufman Bros. Investor Conference in New York at 1:30 p.m. Eastern Time on Wednesday, September 7, 2011 and at the 2011 Citi Technology Conference in New York at 1:45 p.m. Eastern Time on Thursday, September 8, 2011. Forward looking and other material information may be discussed during the presentations. A live webcast and replay of the presentations will be available in the Investor Relations section of the company’s website at www.cabotcmp.com.

ABOUT CABOT MICROELECTRONICS CORPORATION

Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the world's leading supplier of CMP polishing slurries and a growing CMP pad supplier to the semiconductor industry.  The company's products play a critical role in the production of advanced semiconductor devices, enabling the manufacture of smaller, faster and more complex devices by its customers.  The company's mission is to create value by developing reliable and innovative solutions, through close customer collaboration, that solve today's challenges and help enable tomorrow's technology.  Since becoming an independent public company in 2000, the company has grown to approximately 1,000 employees on a global basis. For more information about Cabot Microelectronics Corporation, visit www.cabotcmp.com or contact Trisha Tuntland, Manager of Investor Relations at (630) 499-2600.

CONTACT: Trisha Tuntland
         Manager, Investor Relations
         (630) 499-2600