Employees: 3,000
Number of manufacturing plants: 23
World headquarters: Norwalk, Connecticut
2010 Revenues: $1.3 Billion
| • Advantis Technologies' Water Treatment Business -- October 2008 |
| • Arch buys remaining 51% of Koppers-Arch wood preservative joint venture in Australia - July 2007 |
| • Nordesclor S.A. , Brazilian water-treatment chemicals firm - December 2005 |
| • Avecia Biocides Business - April 2004 |
| • Aquachlor (Pty.) Ltd. in South Africa for water sanitization - August 2003 |
| • Walker Brothers wood treatment - April 2001 |
| • Brooks Industries Personal Care Intermediates - November 2000 |
| • Hickson International PLC - August 2000 |
| • Eastman Chemical's HQEE specialty chemicals business - September 1999 |
