foam filter medium. POLY. Medium thickness: 5 mm - 25 mm. Range of cellular polyurethane foams Our range of polyurethane foams POLY is composed of 6 different weights: type 20, 30, 45, 60, 75, 90. The available thicknesses are 5, 10, 15, 20, 25 mm. Available in plates (2000x1500 and 2000x1000)