Hundreds of firefighters were involved from Thursday to Friday.
The fire also released acids and alkalis, and the emergency services had to wear special protective suits.
Berlin - It took more than fifteen hours until the major fire in a metalworking factory in the south of Berlin could be extinguished.
The cause is so far unclear.
Because chemicals had caught fire, the fireworks described the use on Friday as particularly dangerous and difficult.
The factory is a so-called accident operation with hazards.
An employee of an energy supply company was slightly injured.
"The fire has been out since 11:30 am," the fire brigade announced on Twitter on Friday.
However, the follow-up work would still take a long time, such as the discharge of the partially toxic extinguishing water and the analysis of the leaked chemicals *.
The fire brigade may still be on duty until Saturday morning.
Major fire in Berlin: Hundreds of emergency services involved
The electroplating factory, in which metals are processed and coated, is located in an industrial area in the Marienfelde district of Berlin.
On Friday night, the fire spread across a 500 square meter hall in which acids and alkalis were stored.
Clouds of smoke escaped from the building.
"It is a very dangerous mission, many dangerous substances are stored here," the fire brigade explained.
Some of the emergency services had to wear special protective suits.
Due to the long extinguishing work and the cold - in northern Germany there had previously been an onset of winter with heavy snowfall * - they were replaced every now and then.
Sometimes 170 firefighters were on duty at the same time, in the 15-hour extinguishing campaign from Thursday evening to Friday there were a total of more than 300.
Despite clouds of pollutants, no health risk
In the evening and at night, clouds of pollutants escaped from the burning hall.
According to the fire brigade, health-endangering limits were not exceeded.
The smoke is also more likely to be withdrawn into uninhabited areas.
The residents should keep windows and doors closed.
62 residents were brought to a hotel.
* Merkur.de is part of the nationwide Ippen-Digital editors network.