Styrofoam

This name is the Polish word for molten polystyrene. Styrofoam, because that's what he's talking about, it is a porous plastic material. This name functions for the purposes of trade. Polystyrene is obtained by foaming polystyrene granules, which contain a blowing agent. It can be, for example, petroleum ether. The aforementioned foaming involves heating the granules with steam. It is the most used element for this purpose. Inside there is polystyrene foam. This is worth mentioning, that the cells are connected to each other, in turn, there are tiny air voids between them. As for the quantity - it depends on the density of the material. The same is true of their size. The aforementioned air voids are visible primarily at the turn of plastic, which is polystyrene. The material in question is not resistant to some substances. This mainly applies to organic solvents. Among them, it is worth mentioning such, such as acetone, or aromatic solvents. In addition to inorganic solvents, material, which is the subject of the topic, it is also not resistant to greases and oils.