Rotracc DIY Reticulated Polyurethane Foam/ Air Filter FoamRotracc DIY Reticulated Polyurethane Foam Air Filter Foam Reticulated polyurethane foam is a versatile, open cell material that is light weight, low odor and highly resistant to mildew. It's typically used to make products that are involved in filtration, sound absorption, fluid management, wiping and padding. This family of materials features high tensile, elongation and tear characteristics. The porosity of reticulated foams is vital when designing