Abstract
The microstructures of a variety of low-density (less than 0.1 g cm−3) polymeric foam materials are presented. Structures include the large, but well-defined, closed cells of commercially produced foams and a variety of finer, but often less well-defined, open cells of research foams produced from polymers, carbon, and silica. Other topics covered are the sizes and lowest densities of foams available, optical and X-ray opacity, and ease of handling.
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