Cabot Corporation to Announce Fourth Quarter 2005 Earnings

October 17, 2005

BOSTON, Oct. 17 /PRNewswire-FirstCall/ -- Cabot Corporation (NYSE: CBT) announced today that it will release financial results for the fourth quarter of fiscal 2005 on Wednesday, November 2, 2005, after the market closes. The Company will host a conference call and live webcast to review the fourth quarter results beginning at 9:00 a.m. (ET) on Thursday, November 3, 2005.

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

The call is being webcast by Thomson/CCBN and may be accessed at Cabot's web site at http://investor.cabot-corp.com. The webcast is also being distributed through the Thomson StreetEvents Network. Institutional investors may access the call via Thomson StreetEvents (http://www.streetevents.com), a password-protected event management site.

If you are unable to participate during the live webcast, the call will be archived on the Company's website at http://investor.cabot-corp.com. A recorded playback will also be available beginning at approximately 11:00 a.m. (ET), Thursday, November 3, 2005 and running until Saturday, December 3, 2005. The dial-in number for the replay is (888) 286-8010 within the U.S. or (617) 801-6888 outside the U.S. with a passcode of 84771875.

About Cabot Corporation

Cabot Corporation is a global specialty chemicals and materials company headquartered in Boston, MA. Cabot's major products are carbon black, fumed silica, inkjet colorants, capacitor materials, and cesium formate drilling fluids.

     Contact:
     Susannah Robinson
     Director, Investor Relations
     (617) 342-6244
SOURCE  Cabot Corporation
    -0-                             10/17/2005
    /CONTACT:  Susannah Robinson, Director, Investor Relations of Cabot
Corporation, +1-617-342-6244 /
    /Photo:  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
ST:  Massachusetts
IN:  CHM
SU:  CCA MAV

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