Polystyrene packaging material. Expanded polystyrene chips and block. Polystyrene is a polymer made from styrene,a hydrocarbon liquid manufactured from petroleum. It is melted through heating for moulding or extrusion purposes and returns to a solid state when cooled. Expanded polystyrene is produced from a mixture of polystyrene and a gaseous blowing agent (usually pentane or carbon dioxide). The solid plastic expands into a foam when it is heated by steam | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Public Health England |
Taille de l’image : | 3786 px × 2555 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |