New England Foam supplies, nverts and fabricates the following types of polyethylene foam: Laminated Polyethylene Plank (PolyLam™ and Stratocell™) Largest sheet size = 12″ x 48” x 108”. 0.9 pcf (light gray) 1.2 pcf (light green) 1.7 pcf (white, black and pink) 2.2 pcf (white, black and pink) Extruded Polyethylene Plank.