Summary of ARCH CHEMICALS INC

Results of Operations and Financial Condition, Material Impairments, Financial

ITEM 2.02. RESULTS OF OPERATIONS AND FINANCIAL CONDITION

On February 4, 2009, Arch Chemicals, Inc. (the "Company") released the results of operations and financial condition for the three and twelve months ended December 31, 2008. Attached as Exhibit 99, and incorporated herein by reference, is a copy of the Company's earnings press release dated February 4, 2009.

Included in Exhibit 99 are references to the Company's income and earnings per share from continuing operations which, in some cases, as noted in such Exhibit, exclude the effects of the restructuring, impairment, the reversal of penalties and interest related to a Brazilian state import tax claim recorded in 2004, gain on the completion of a contract with the U.S. Government, the impact of the change in the U.K. tax rate related to the Company's U.K. pension plans and the impact of a change in the Italian tax rate on deferred tax items originally set up in purchase accounting. Reconciliations of these non-GAAP financial measures to what the Company believes is the most directly comparable U.S. GAAP financial measures are provided in such Exhibit. The Company believes that these non-GAAP financial measures provide comparative information to the earnings guidance that was provided on November 10, 2008 by the Company as well as comparison of results to prior year and therefore are useful to the investment community.

ITEM 2.06. MATERIAL IMPAIRMENTS

As a result of an update to its financial forecast and in connection with the year-end review of its accounts, on February 2, 2009, the Company concluded that it had an impairment of its goodwill for its industrial coatings business. As a result, the Company has recorded a non-cash impairment charge of approximately $25 million which has eliminated the remaining carrying amount of goodwill for this business.