CCMP CMC Materials Inc

Cabot Microelectronics Corporation (NASDAQ:CCMP), the leading supplier of chemical mechanical planarization (CMP) polishing slurries to the semiconductor industry, today announced that it has received Samsung Electronics Co., Ltd.'s "Best in Value" Supplier Appreciation Award in recognition and appreciation of the company's exemplary performance as an outstanding supplier. The award is the highest honor Samsung Electronics bestows upon its suppliers, and was presented to the company by ChangGyu Hwang, Ph.D., President and Chief Executive Officer, Semiconductor Business, Samsung Electronics. Cabot Microelectronics was one of only five suppliers to be presented with the award on October 13. "We are honored to have earned this prestigious award from Samsung, a global leader in semiconductor manufacturing," stated William P. Noglows, Chairman and Chief Executive Officer of Cabot Microelectronics Corporation. "It is gratifying to be recognized for our successful partnership with strategic customers such as Samsung, which we believe is a direct result of our renewed initiatives in the areas of technology leadership, operations excellence, and getting closer to our customers." About Cabot Microelectronics Corporation: Cabot Microelectronics Corporation, headquartered in Aurora, Illinois, is the leading supplier of CMP slurries for polishing various materials used in semiconductor manufacturing processes. 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 Investor Relations at (630) 499-2600. Safe Harbor Statement: This news release may include statements that constitute "forward-looking statements" within the meaning of federal securities regulations. These forward-looking statements include statements related to future sales and operating results, company and industry growth and trends, growth of this market, international events, product performance, new product introductions and development of new products and technologies by Cabot Microelectronics. These forward-looking statements involve a number of risks, uncertainties, and other factors, including those described from time to time in Cabot Microelectronics' filings with the Securities and Exchange Commission (SEC), that could cause the actual results to differ materially from those described by these forward-looking statements. In particular, see "Risks Relating to Our Business" in Management's Discussion and Analysis in our quarterly report on Form 10-Q for the quarter ended June 30, 2005, and our Annual Report on Form 10-K for the fiscal year ended September 30, 2004, both filed with the SEC. Cabot Microelectronics Corporation assumes no obligation to update this forward-looking information.