About 400 firefighters worked through the night into Thursday morning to cool down the 1,300 degree C flow of glass at the Rexam packaging company, spraying down the spill with 5,000 litres of water per minute, a fire spokesman said.
"It's like a sauna. You can't really see your hand in front of your eyes," spokesman Martin Moehring said.
No one was injured in the accident at the factory, about 100 kilometres southwest of Berlin
The $24 million Cdn vat must be repaired and it might be four to six weeks before production can resume, the company said. The company said it does not yet kow how much the accident will cost.