Pittsburgh, Pennsylvania, USA, 05 July 2007 -- /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP) today announced the sale of its 51% ownership interest in Koppers Arch Investments Pty Ltd. to Arch Chemicals, Inc. (NYSE: ARJ), its joint venture partner.

Koppers Arch sells timber preservation chemicals and has operations in Australia, New Zealand, Southeast Asia, and South Africa. Its products are primarily non-coal tar based chemicals, including copper chrome arsenates and light organic solvent preservatives.

Revenues for Koppers Arch for 2006 net of intercompany sales amounted to USD 51.5 million, or 4% of 2006 sales, and net income amounted to USD 1.1 million net of intercompany transactions (USD 0.6 million after minority interest). The estimated selling price is approximately USD 19 million, which the company intends to use primarily for debt reduction. The selling price is subject to a post-closing working capital adjustment.

Walter W. Turner, president and CEO of Koppers, said, "We were pleased to complete this sale to our long-time partner Arch Chemicals and believe that the change in ownership will be beneficial to all parties, including the customers and employees of the former joint venture. More specifically for Koppers, the completion of this transaction enhances our focus on our core business strategies in support of continued growth in the aluminum and railroad markets and allows us to accelerate debt reduction."

About Koppers

Koppers, with corporate headquarters and a research center in Pittsburgh, Pennsylvania, is a global integrated producer of carbon compounds and treated wood products. Koppers operates facilities in the United States, United Kingdom, Denmark, Australia, and China. The stock of Koppers Holdings Inc. is publicly traded on the New York Stock Exchange under the symbol "KOP."

Source: Koppers Holdings Inc.