Polyurethanes are widely used in high resiliency flexible foam seating , rigid foam insulation panels , microcellular foam seals and gaskets , durable elastomeric wheels and tires , automotive suspension bushings , electrical potting compounds , high performance adhesives and sealants , Spandex fibers , seals , gaskets , carpet underlay , and hard plastic parts . Polyurethanes are widely used in high resiliency flexible foam seating , rigid foam insulation panels , microcellular foam seals and gaskets , durable elastomeric wheels and tires , automotive suspension bushings , electrical potting compounds , high performance adhesives , surface coatings and sealants , Spandex fibers , seals , gaskets , carpet underlay , and hard plastic parts ( such as for electronic instruments ) .