Page "Polyurethane" Paragraph 10

Starting in the early 1980s, water-blown microcellular flexible foams were used to mold gaskets for panel and radial seal air filters in the automotive industry.

Since then, increasing energy prices and the pressures to eliminate PVC plastisol from automotive applications have greatly increased market share.

Costlier raw materials are offset by a significant decrease in part weight and in some cases, the elimination of metal end caps and filter housings.

Highly filled polyurethane elastomers, and more recently unfilled polyurethane foams are now used in high temperature oil filter applications.