Definition - What does Polyurethane Foam mean?
Polyurethane foam is a synthetic polymer that contains urethane radicals. Polyurethane foam is used to provide insulation and protection of material against external sources that propagate corrosion.
Corrosionpedia explains Polyurethane Foam
There are two types of polyurethane foam that are generally used, namely: rigid and flexible. Rigid polyurethane foam is used for most insulation purposes while flexible polyurethane foam is used for packaging, padding and several commercial purposes. Polyurethane foam can also be classified based on its composition and fundamental properties, as either ester or ether polyurethane foam.