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Humid Age Compression Set in High Resilience Polyurethane Foam

As with any new technology, the development of high resiliency (HR) polyurethane seat form required the solution of several problems. They could be separated into processing changes which were discussed in a previous paper [1] and changes which related to the new chemistry of the HR system. It is the investigation of chemical changes in the foam which will be the subject of this paper. To aid in defining the chemical differences in the two foams, hot foam and HR foam, their components are described in Table 1. There were differ-