Six fire engines and around 40 firefighters tackled a fire at an asphalt plant on Pump Lane in Hayes.
Part of a conveyor belt transporting bitumen to a drying tower unit and the drying tower motor was damaged by fire. An on-site container containing mechanical spares was also destroyed by fire. There were no reports of any injuries.
The Brigade was called at 0241 and the fire was under control by 0425. Fire crews from Hayes, Southall, Heathrow and Hillingdon fire stations attended the scene.
The cause of the fire is under investigation.