Moosgummi caoutchouc mousse foam rubber gomaespuma gommapiuma poliuretanska pena polyetenskum schuimrubber αφρώδες ελαστικό גומאויר polyether Light spongy rubber made by mechanically whipping air into the rubber latex prior to curing. It is used for mattresses, cushions, and insulation. Foam rubber turns yellow and becomes powdery when exposed to sunlight (AAT).