Around ten fire engines and 60 firefighters remain at the scene of a recyling plant fire in Smethwick, West Midlands Fire Service said.
Firefighters are likely to remain on site until tomorrow, with the operation now in it's "final stages".
West Midlands Fire Service are working with a digger and excavator to break up the molten, compacted plastic, sto safely extinguish any hidden pockets of fire.
Northamptonshire's Arson Task Force is warning local residents about floating lanterns following the fire at a Smethwick recycling plant.
Around 50,000 tonnes of plastic recycling material and a factory is on fire in Smethwick.