Exhibit 21



AMENDED LIST OF SUBSIDIARIES



|                                                        |  |                                  
|------------------------------------------------------- |  | ---------------------------------
|Entity Name                                             |  | State or Country of Incorporation
|Concrete Partners, Inc.                                 |  | Delaware                         
|Continental Carbon Australia Pty. Ltd.                  |  | Australia                        
|Koppers Assurance, Inc.                                 |  | South Carolina                   
|Koppers (China) Carbon & Chemical Company Limited       |  | Peoples Republic of China        
|Koppers Arch Wood Protection (SA) (Proprietary) Limited |  | South Africa                     
|Koppers Arch Chemicals (M) Sdn Bhd                      |  | Malaysia                         
|Koppers Arch International Pty Limited                  |  | Australia                        
|Koppers Arch Investments Pty Limited                    |  | Australia                        
|Koppers Arch Wood Protection (Aust) Pty Limited         |  | Australia                        
|Koppers Arch Wood Protection (Fiji) Limited             |  | Fiji                             
|Koppers Arch Wood Protection (M) Sdn Bhd                |  | Malaysia                         
|Koppers Arch Wood Protection (NZ) Limited               |  | New Zealand                      
|Koppers Australia Holding Company Pty Limited           |  | Australia                        
|Koppers Australia Pty. Limited                          |  | Australia                        
|Koppers Carbon Materials & Chemicals Pty. Ltd.          |  | Australia                        
|Koppers Concrete Products, Inc.                         |  | Delaware                         
|Koppers Denmark A/S                                     |  | Denmark                          
|Koppers Europe ApS                                      |  | Denmark                          
|Koppers European Holdings A/S                           |  | Denmark                          
|Koppers Delaware, Inc.                                  |  | Delaware                         
|Koppers Investment Subsidiary Pty Ltd.                  |  | Australia                        
|Koppers Luxembourg S.ar.l.                              |  | Grand Duchy Luxembourg           
|Koppers Mauritius                                       |  | Republic of Mauritius            
|Koppers Monessen Partners LP                            |  | Delaware                         
|Koppers Poland Sp. z.o.o.                               |  | Poland                           
|Koppers Redemption, Inc.                                |  | Delaware                         
|Koppers Shipping Pty. Ltd.                              |  | Australia                        
|Koppers Wood Products Pty. Ltd.                         |  | Australia                        
|Koppers Trading Denmark A/S                             |  | Denmark                          
|Koppers Trading (Beijing) Co. Ltd.                      |  | Peoples Republic of China        
|Koppers UK Holding Limited                              |  | United Kingdom                   
|Koppers UK limited                                      |  | United Kingdom                   
|Koppers Lambson Limited                                 |  | United Kingdom                   
|Koppers UK Transport Limited                            |  | United Kingdom                   
|Koppers-Hickson Timber Protection (PNG) Pty Limited     |  | New Guinea                       
|World-Wide Ventures Corporation                         |  | Delaware