Bha Group, Inc.

Bha Altair. LLC

Cynthia Polizzi

Jack Thomas Clements

Alan Smithies

Yit-Hong Tee

Taher Abujoudeh

A composite filter media structure and an associated method of making are provided. The structure includes a base substrate that includes a nonwoven fabric substrate formed from a plurality of bicomponent synthetic fibers using a spunbond process. The composite filter media structure includes a surface layer deposited on one side of the base substrate where a thermal lamination process can be used to combine the base substrate and the surface layer. The surface layer is formed from a microporous expanded polytetrafluoroethylene membrane. In one aspect, the base substrate and the surface layer are configured to provide greater than 95% and equal to or less than 99.5% filtration efficiency measured in accordance with an EN 1822 test method. In another aspect, the filter media includes an embossing pattern or a plurality of corrugations formed using opposing rollers at a temperature of about 90&#xb0; C. to about 140&#xb0; C.

High performance gas turbine inlet filter (HEPA) using membrane media

A waterproof, vapor-permeable and gas-permeable sheet material and a method of making are provided. The sheet material includes a waterproof microporous layer and a thermoplastic layer attached to the microporous layer. The thermoplastic layer is vapor-permeable and air-permeable. The microporous layer is at least partially integrated with the thermoplastic layer to form a zone that prevents passage of water droplets, while permitting passage of water vapor and air, when a chemical is present on the sheet material that would otherwise cause the microporous layer to permit passage of water droplets. The Zone can be considered to be resistant to chemical interference with at least the waterproof property of the microporous layer and inhibits detachment of the layers.

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Lee's Summit, MO, United States of America

Cynthia Polizzi