Flexible foam

Flexible polyurethane foam has gained attention due to its lightweight, high strength-to-weight ratio, and superior comfort-enhancing properties. Its open-cell structure allows air to circulate within the foam when compressed. Since flexible polyurethane foams result from two competing reactions—gas formation (blowing) and cross-linking (gelling)—a proper balance between the rates of these reactions is essential to achieve an optimal open-cell morphology with desirable density.