Crompton to Speak at Goldman Sachs Basic Materials Conference

    Business Editors
    Goldman Sachs Basic Materials Conference

    MIDDLEBURY, Conn.--(BUSINESS WIRE)--May 11, 2005--Robert L. Wood, chairman and chief executive officer of Crompton Corporation (NYSE: CK), will speak at the Goldman Sachs Basic Materials Conference in New York City on Wednesday morning, May 18, at 8:00 a.m. Eastern daylight savings time.
    Persons wishing to hear Mr. Wood's presentation may participate in a live webcast by clicking on the Investor Relations button at www.cromptoncorp.com.
    Crompton Corporation, with 2004 sales of $2.5 billion, is a producer and marketer of specialty chemicals and polymer products. Additional information concerning Crompton Corporation is available at www.cromptoncorp.com.

--30--BS/ny*

CONTACT: Crompton Corporation Investors: William Kuser, 203-573-2213 or Media: Mary Ann Dunnell, 203-573-3034

KEYWORD: CONNECTICUT NEW YORK INDUSTRY KEYWORD: CHEMICALS/PLASTICS BANKING CONFERENCE CALLS SOURCE: Crompton Corporation

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