One of the common ingredients in mattresses and upholstered is polyurethane foam. In descriptions of mattresses, it is often called "poly foam." With differing densities, resiliency and other characteristics, it can be a base pad, support core, comfort layer, or quilting foam. It was used before the invention of memory foam, which itself was developed from polyurethane. Polyurethane (PU) foam is made by linking large molecules, usually isocyanates, to each other with modified oil molecules...