Foamed plastic | Britannica
foamed plastic, synthetic resin converted into a spongelike mass with a closed-cell or open-cell structure, either of which may be flexible or rigid, used for a variety of products including cushioning materials, air filters, furniture, toys, thermal insulation, sponges, plastic boats, panels for buildings, and even lightweight beams.
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Foamed Plastics - an overview | ScienceDirect Topics
Plastic foams are generally treated by the same surface-preparation methods used for the base polymer. This is particularly true for the thermoplastic “structural” foams such as polycarbonate and modified polyphenylene oxide. In some cases, these thermoplastic foams may be solvent cemented.
Plastic - Foaming | Britannica
Foams, also called expanded plastics, possess inherent features that make them suitable for certain applications. For instance, the thermal conductivity of a foam is lower than that of the solid polymer. Also, a foamed polymer is more rigid than the solid polymer for any given weight of the material.