The global economic slowdown has forced engineering company Sedgman to write-off $20 million of goodwill value from its Perth-based subsidiary Intermet Engineering, which it bought less than two years ago for $32 million.

The global economic slowdown has forced engineering company Sedgman to write-off $20 million of goodwill value from its Perth-based subsidiary Intermet Engineering, which it bought less than two years ago for $32 million.