Cabot Corporation (NYSE: CBT) today announced that it priced a public offering of $250 million of 2.55% senior unsecured notes due 2018 and $350 million of 3.70% senior unsecured notes due 2022. The 2018 Notes are being sold to the public at 99.872%, and the 2022 Notes are being sold to the public at 99.892%. Cabot will pay interest on the notes semi-annually on January 15 and July 15 of each year, beginning January 15, 2013. The sale of the notes is expected to close on July 12, 2012, subject to customary closing conditions. Cabot intends to use the net proceeds of the offering to pay a portion of the consideration for the pending acquisition of Norit N.V., the global leader in activated carbon.

J.P. Morgan and Citigroup are the joint book-running managers for the offering. The offering of these securities is being made only by means of a prospectus and related prospectus supplement. Electronic copies of the prospectus and related prospectus supplement may be obtained for free by searching the SEC online data base (EDGAR) on the SEC web site at Alternatively, this information may be requested by calling J.P. Morgan Securities LLC collect at (212) 834-4533 or Citigroup Global Markets Inc. toll-free at (877) 858-5407.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Cabot Corporation

Cabot Corporation, headquartered in Boston, Massachusetts, is a global specialty chemicals and performance materials company. Cabot’s major products are carbon black, fumed silica, cesium formate drilling fluids, inkjet colorants and aerogels. The Company’s website address is:

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and the federal securities laws about the closing of the notes offering and the use of proceeds for the acquisition of Norit. These statements are not guarantees that these events will occur. Important factors that could affect these events are discussed in the prospectus relating to the offering that may be obtained as described above.

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