Turns into dust

In general, polystyrene is a solid foam of polystyrene, which is obtained as a result of polymerization. Foam very positively tolerates the alkaline environment, does not perceive acids, technical oils. Of course, much also depends on the foam manufacturer. It is proved that approximately at a temperature of + 60 the properties of foam worsen. If we take into account that with the chemical interaction of poor -quality foam with plaster, paint the process is accelerated and the foam turns into dust.