Cabot Breaks Ground on New Fumed Silica Facility in Jiangxi, China

January 20, 2005
          Project of Cabot Bluestar Chemical (Jiangxi) Company Ltd.

BOSTON, and BEIJING, Jan. 20 /PRNewswire-FirstCall/ -- Cabot Corporation (NYSE: CBT) today broke ground on its new world-class fumed silica manufacturing facility located in Jiangxi province, China. The facility is a project of Cabot Bluestar Chemical (Jiangxi) Company Ltd., a joint venture between its wholly-owned subsidiary, Cabot (China) Limited, and Bluestar New Chemical Materials Co., Ltd., a part of the China National Chemical Group. Cabot is investing approximately US $30 million to construct the plant scheduled for completion in the first half of 2006.

(Logo: http://www.newscom.com/cgi-bin/prnh/20000323/CABOTLOGO )

The new plant in Jiangxi will be Cabot's sixth fumed silica manufacturing facility. Other Cabot fumed silica manufacturing facilities are located in the US, Europe and India.

At the groundbreaking ceremony, Cabot Chairman and CEO Kennett F. Burnes said, "We are pleased to be here with the support of the government of China and China Bluestar Company to celebrate the development of the first, world- class fumed silica production facility in China. With the robust economy in China and throughout the Asia Pacific, this new plant will allow us to supply our customers with the materials necessary to sustain this growth."

About Cabot Corporation

Cabot Corporation is a global specialty chemicals and performance materials company headquartered in Boston, MA. The Company produces carbon black, fumed silica and metal oxides, thermoplastic concentrates, specialty metals, ink-jet colorants, and oil drilling fluids. Our website address is: http://www.cabot-corp.com.

About China National Bluestar (Group) Corporation

China National Bluestar (Group) Corporation is one of the backbone state- owned enterprises in China, administered by the central government, headquartered in Beijing with a total asset of over 20 billion Yuan RMB. The Bluestar Group owns 10 specialized companies under which there are nearly hundreds of enterprise and scientific research institutions, as well as four listed companies in the stock market, including Bluestar New Chemical Materials Co., Ltd.. Its overseas branch offices are located in the USA, Japan, Australia and Ukraine. Bluestar's website address is http://www.china-bluestar.com.

     Contact:
     Ethel Shepard
     Corporate Affairs Manager
     617-342-6254
     ethel_shepard@cabot-corp.com

     Susannah Robinson
     Director, Investor Relations
     617-342-6129
     susannah_robinson@cabot-corp.com
SOURCE  Cabot Corporation
    -0-                             01/20/2005
    /CONTACT:  Ethel Shepard, Corporate Affairs Manager, +1-617-342-6254,
ethel_shepard@cabot-corp.com, or Susannah Robinson, Director, Investor
Relations, +1-617-342-6129, susannah_robinson@cabot-corp.com, both of Cabot/
    /Photo:  NewsCom:  http://www.newscom.com/cgi-bin/prnh/20000323/CABOTLOGO
             AP Archive: http://photoarchive.ap.org
             PRN Photo Desk, photodesk@prnewswire.com /
    /Web site:  http://www.cabot-corp.com/
    (CBT)

CO:  Cabot Corporation; Cabot Bluestar Chemical (Jiangxi) Company Ltd.; Cabot
     (China) Limited; Bluestar New Chemical Materials Co., Ltd.; China
     National Chemical Group
ST:  China, Massachusetts
IN:  CHM
SU:

LJ-CP
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8974 01/20/2005 08:51 EST http://www.prnewswire.com