closedcell

Closedcell is a term used to describe a type of cellular foam or plastic structure in which the cells are closed and do not connect, trapping gas and producing a denser, more rigid material. This closed-cell structure minimizes gas permeability and moisture uptake compared with open-cell foams, contributing to higher strength and rigidity.

Common closed-cell materials include polyurethane foam, polyisocyanurate foam, extruded polystyrene foam (XPS), and closed-cell polyethylene foam. They exhibit high thermal resistance, low water absorption, high compressive strength, and good dielectric properties. The exact properties depend on the resin formulation and processing method.

Advantages of closed-cell foams include superior insulation value, buoyancy in flotation products, and stability under compression. Disadvantages include lower sound absorption, higher cost, and greater rigidity that can reduce conformity to irregular shapes. Production often relies on blowing agents, which may raise environmental concerns, and recycling can be more challenging due to cross-linked or bonded structures.

Applications span building insulation (roofs, walls, slabs), refrigeration and cold-chain insulation, flotation devices and marine products, packaging protection for sensitive items, automotive and aerospace interior padding, and various sports equipment. The term closed-cell is also used in other contexts where a sealed-cell foam structure is desired for density, moisture resistance, or buoyancy.

Overall, closedcell describes foams and plastics engineered with sealed cells to provide moisture resistance, insulation, and structural integrity, at the expense of breathability and some flexibility compared with open-cell varieties.