Abstract: Disclosed is a water-proof and dust-proof membrane assembly and applications thereof. The water-proof and dust-proof membrane assembly comprises a body and a supporting member. The body is of membrane and has a first surface, a second surface, and an asymmetric porous structure formed between the first surface and the second surface of the body. The asymmetric porous structure has a thickness ranging between 1 ?m and 1000 ?m, a first volumetric porosity ranging between 5% and 99%. The asymmetric porous structure has plural pores, and each pore has a pore diameter between 0.01 ?m and 15 ?m. The supporting member is of a polymeric material and has a first contacting surface, a second contacting surface, and a second volumetric porosity which is greater than the first volumetric porosity. The first contacting surface of the supporting member is adhered to the first surface of the body.

Abstract: A water-proof and dust-proof membrane assembly which has a satisfactory water-proof property, dust-proof property, sound transmission capability and air permeability, as well as excellent supporting intensity and pressure resistance is provided. A water-proof and dust-proof membrane assembly having a body and a supporting member, in which the body is an asymmetric porous structure in the form of membrane having a first surface and a second surface, the supporting member is composed of a polymeric material, includes a first contact surface and a second contact surface and the porosity (second porosity) of the supporting member is larger than the first porosity, i.e. 10% to 99.9%, and the first surface of the body and the first contact surface of the supporting member are bonded is provided.

Abstract: Disclosed is a polymeric electret film as well as the method of manufacturing the same. The polymeric electret film comprises a polytetrafluoroethylene film and an electrode layer. The polytetrafluoroethylene film includes a porous layer, which has a porous structure. The porous structure has a pore diameter ranging between 0.01 ?m and 5.0 ?m and has a porosity ranging between 20% and 95%. The polytetrafluoroethylene film has a thickness ranging between 1 ?m and 50 ?m, and is preferably made of expanded porous polytetrafluoroethylene. The polymeric electret film has a surface potential ranging between 0.1 V and 1000 V.

Abstract: A water-proof and dust-proof membrane assembly which has a satisfactory water-proof property, dust-proof property, sound transmission capability and air permeability, as well as excellent supporting intensity and pressure resistance is provided. A water-proof and dust-proof membrane assembly having a body and a supporting member, in which the body is an asymmetric porous structure in the form of membrane having a first surface and a second surface, the supporting member is composed of a polymeric material, includes a first contact surface and a second contact surface and the porosity (second porosity) of the supporting member is larger than the first porosity, i.e. 10% to 99.9%, and the first surface of the body and the first contact surface of the supporting body are bonded is provided.