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                       Open Cell FoamOpen cell foam may be from a foam filter, foam padding, or the padded insole
                      of a shoe. Fragments of foam are common in
                      indoor environmental samples.                           
                       Closed Cell FoamClosed cell foams are used as insolation and as structural materials in
                      shipping containers.     
                       Floral FoamFloral foams are designed to retain water. The are typically microporous as
                      well as being an open cell type foam.       
                       Urea and Melamine-Formaldehyde FoamThis type of foam is used as insolation and as a filler for gaps in
                      structures.           
 
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