For perforated container covers, gas will pass through the SST-Porous® PE aluminum foil liners and escape through the hole in the container cover, while preventing liquids and particles from entering the package. Aluminum foil breathable liner prevent pressure buildup by continuously equalizing the differential pressure between the container’s internal and external.  

SST-Porous® PE foam vent seal liner, made by  modified oleophobic ePTFE membrane and HPTE parts,  welded together by ultrasonic or thermal melt.  The completed component vent could equalize pressure imbalance to prevent container/bottle from deformation causing dangerous spills or costly returns.