Ef-materials Industries Inc.

Radium Huang

James Huang

Sean Chen

Jeff Han

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 &#x3bc;m and 1000 &#x3bc;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 &#x3bc;m and 15 &#x3bc;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.

Water-proof and dust-proof membrane assembly and applications thereof

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 &#x3bc;m and 5.0 &#x3bc;m and has a porosity ranging between 20% and 95%. The polytetrafluoroethylene film has a thickness ranging between 1 &#x3bc;m and 50 &#x3bc;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.

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Zhongli, Taiwan

Radium Huang