Cabot Corporation to Announce Second Quarter 2006 Earnings

April 12, 2006

BOSTON, April 12 /PRNewswire-FirstCall/ -- Cabot Corporation (NYSE: CBT) announced today that it will release financial results for the second quarter of fiscal 2006 on Wednesday, May 3, 2006 after the market closes. The Company will host a conference call and live webcast to review the second quarter results beginning at 9:00 a.m. (ET) on Thursday, May 4, 2006.

(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 a.m. (ET), Thursday, May 4, 2006 and running until May 18, 2006. 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 15831251.

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:   Investor Relations
               (617) 342-6244


SOURCE  Cabot Corporation
    -0-                             04/12/2006
    /CONTACT:  Investor Relations for Cabot Corporation, +1-617-342-6244/
    /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
ST:  Massachusetts
IN:  CHM
SU:  CCA MAV

EO-AC
-- NEW002 --
8629 04/12/2006 11:30 EDT http://www.prnewswire.com