AbstractPneumacel, a new kind of resilient closed‐cell foam, has characteristics especially useful for firm cushioning materials. A fluorocarbon inflatant in addition to air present in the closed cells provides a mechanism for recovery from long‐term loading for nonelastomeric polymer foams such as poly(ethylene terephthalate). The basic structural features characterizing pneumacel contribute to its performance as a resilient foam. Important principles in selecting the optimum combination of polymer and inflatant are described, as well as the process for making pneumatic cellular products. Development work on applications of pneumacel fibers has led to its utilization in cushions for under carpets, padding for use over springs in mattresses, automobile seats, and furniture. Properties of the assemblies of fibers for such uses are descri
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