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Cabot Microelectronics and Ondeo Nalco Announce a Wastewater Management And Water Recycle Alliance

AURORA, Ill., Dec. 4 /PRNewswire-FirstCall/ -- Cabot Microelectronics Corp. (Nasdaq: CCMP), the leading supplier of chemical mechanical planarization (CMP) polishing slurries to the semiconductor industry, today announced that it has formed an alliance with Ondeo Nalco to provide flexible strategic sourcing solutions for wastewater management and water recycle (WWM/WR) to CMP customers in defined segments of the Electronics industry. In order to provide CMP customers with the benefit of the leading- edge expertise of both Cabot Microelectronics and Ondeo Nalco in this critical area of the overall semiconductor manufacturing process, Cabot Microelectronics brings its extensive knowledge of CMP consumables and the CMP process and Ondeo Nalco will deliver the WWM/WR strategic sourcing packages directly to customers.

"As a technology leader in CMP, Cabot Microelectronics prides itself on providing our customers with added value and complete solutions for their CMP requirements. Among the critical issues facing semiconductor manufacturers are increasingly stringent requirements for reducing wastewater generation and water usage. We believe this alliance will combine our in-depth knowledge of CMP processes and chemistries with Ondeo Nalco's leadership in wastewater management and water recycling to offer our customers robust solutions to these challenges," stated Jeremy Jones, Cabot Microelectronics' Vice President of New Business Development.

"We finance, operate, maintain, and continuously adapt and improve the water management/water recycle process for the customer," said Matt Knight, Vice President of the Industrial and Institutional Services Division for Ondeo Nalco. "This allows customers to focus on their core competency -- making semiconductors -- while accessing the technology needed to manage their wastewater needs." Where appropriate, Ondeo Nalco will utilize the services and products of its affiliate, Ondeo Industrial Solutions, in delivering WWM/WR solutions to customers.

About Cabot Microelectronics Corporation

Cabot Microelectronics, headquartered in Aurora, Illinois, USA, is the world leader in the development and supply of high-performance polishing slurries used for chemical mechanical planarization (CMP), a process that enables the manufacture of the most advanced integrated circuit (IC) devices and hard disk drive components. The Company reported fiscal 2002 revenues of $235.2 million. For more information please visit the Cabot Microelectronics web site at or call 1-630-499-2600.

About Ondeo Nalco

Ondeo Nalco, a subsidiary of SUEZ Environment Industrial Services division, is the worldwide leader in water treatment and process chemicals with 10,000 employees working with more than 60,000 customers in 130 countries and annual revenues of $2.7 billion. For more information, please visit the Ondeo Nalco website at .

Safe Harbor Statement

The statements contained in this news release may contain "forward-looking statements." Actual results may differ materially from those anticipated in such forward-looking statements. All of these statements are expressly qualified in their entirety by the risk factors and other cautionary statements included in Cabot Microelectronics' filings with the Securities and Exchange Commission. Cabot Microelectronics Corporation assumes no obligation to update this forward-looking information.

CONTACT: Jeremy Jones, Vice President, New Business Development of Cabot
Microelectronics Corporation, +1-630-375-6631, or Olivia Barberis, External
Communications Manager of Ondeo Nalco, +1-630-841-8679.
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SOURCE Cabot Microelectronics Corp.

-0- 12/04/2002

/CONTACT: Jeremy Jones, Vice President, New Business Development of Cabot Microelectronics Corporation, +1-630-375-6631, or Olivia Barberis, External Communications Manager of Ondeo Nalco, +1-630-841-8679/

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