The first such synthesis was obtained at the beginning of the 20th century by the BASF company, and already in the 30s of the 20th century this material was produced on a large scale. At the end of 1952, a method of the appearance of a porous mass from polystyrene was published, which undoubtedly indicates the occurrence of polystyrene foam. The State Propelling Service of the Russian Federation classifies such a material as a self -adjusting. That is safe.
