Penefil 250 H is a two-component, closed cell, water blown, rigid, slab-jacking foam designed to raise and stabilize concrete or asphalt in residential uses. Penefil 250 H is a hydrophobic 2.50 pcf polyurethane polymer, which provides a fast injecting and workable repair solution for most settling problems in patio slabs, driveways, and sidewalks.