Seksui Alveo AG in Switzerland has developed what is believed to be the first partially open-cell crosslinked polyolefin foam in roll form. Partially open cells allow the foam to compress easily without being porous to air or moisture. The product is designed for sealing tapes to insulate buildings and stop drafts and seal ventilation ducts. It’s been marketed for about a year as Alveo-Soft. The technology is described in the patent application (U.S. Pat. Applic. 20080003421) as taking the crosslinked foam sheet and compressing it between rollers to rupture some of the bubbles. The level of rupture or softness can be controlled. Sekisui Alveo makes both PE and PP Alveo-Soft foams and offers four levels of softness from 0.7 to 5.8 psi compressive strength at 50% compression. Tensile strength is 36 psi. Water absorption is at most 2%. The product is extruded up to 2 meters wide and 2 to 12 mm thick and can be laminated to achieve other thicknesses or levels of softness. +41 (41) 228-9292 • www.sekisuialveo.com
Editor PickSizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.