EXHIBIT 23

Analysis, Research & Planning Corporation’s Consent

Union Carbide Corporation:

Analysis, Research & Planning Corporation (“ARPC”) hereby consents to the use of ARPC’s name and the reference to ARPC’s reports appearing in this Quarterly Report on Form 10-Q of Union Carbide Corporation for the quarter ended September 30, 2005.

/s/ B. THOMAS FLORENCE

B. Thomas Florence

President

Analysis, Research & Planning Corporation

October 28, 2005

36