Foam

Sheets of foamed polystyrene for insulation of houses.

Foam is a solid or liquid matrix filled with many gas bubbles. Due to its low density, most types of foam are good insulators. The external fuel tank of the Space Shuttle is insulated with a layer of foam. Other uses include sealants, bedding, consumer goods, and construction materials.

Foam glass, either with open or closed cell should be an interesting construction material that can be created In-Situ.

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