Abstract: A protective cover assembly is disclosed that comprises a porous expanded membrane having a plurality of pores, a first surface and a second surface opposite the first surface. The porous expanded membrane comprises an active area and a bonded area. The bonded area comprises an adhesive material that forms a bridge extending through the plurality of pores in the bonded area from the first surface to the second surface. The adhesive material in the bonded area improves the Z-strength and allows the porous expended membrane to be a lightweight material having a mass/area ratio of less than or equal to 3 g/m2.

Abstract: A protective cover assembly is disclosed that comprises a porous expanded membrane having a plurality of pores, a first surface and a second surface opposite the first surface. The porous expanded membrane comprises an active area and a bonded area. The bonded area comprises an adhesive material that forms a bridge extending through the plurality of pores in the bonded area from the first surface to the second surface. The adhesive material in the bonded area improves the Z-strength and allows the porous expended membrane to be a lightweight material having a mass/area ratio of less than or equal to 3 g/m2.

Abstract: A high throughput acoustic vent structure test apparatus includes first and second elements that can removably connect with one another to sealingly enclose an acoustic cavity. A test sample holder can be enclosed in the acoustic cavity, the test sample holder having a test sample side and a microphone side, with a plurality of ports therethrough and a plurality of microphones on the microphone side connected with the ports. An acoustic source is positioned in the acoustic cavity opposite the test sample holder, and operable to generate an acoustic signal that can be picked up by the microphones through the plurality of ports. In operation, test samples of acoustic vent structures can be positioned on the test sample holder.