Polyurethane Home Products Services Materials About Us Contact Us | Materials | Bookmark Page | Polyurethane Foam Also known as PU, "Foam Rubber", "Ester" or "Ether". This would... be the foam used in seat cushions... very soft material and usually seen in white, charcoal, gray or blue. Both Ether types and Ester types are fabricated for packaging primarily... Flexible, open cell structure Colors include white, blue, gray, anti-stat pink Filter foam Low cost cushioning for lightweight items Excellent media for display packaging Can...