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Microporous PTFE Tubing Separates Gases From Liquids

Originally Published MPMN April 2004


Microporous PTFE Tubing Separates Gases From Liquids

Eliminates the need for more costly multiple stones or injection ports

Susan Wallace
EXPT tubing from Markel Corp. separates gases from liquids in some medical device appliances.

A precision method for the processing of polytetrafluoroethylene (PTFE) has been developed. Using this technique, Markel Corp. (Plymouth Meeting, PA) offers its EXPT tubing. It extracts gases from liquids or injects gases into liquids.

"The tubing would be suitable for separating gases in some appliances used in the medical field," says Frank Harned, vice president of special projects for the company. It is not for use inside the body.

EXPT is produced by continuously stretching paste extruded PTFE resin to create a structure of nodes and pores. The proprietary process can be precisely controlled to impart varying degrees of microporosity. This is locked in during the sintering stage, so that the tubing can be custom made for use with specific gases.

The products made possible through the development of this process are suitable for extracting hydrogen from solution or methane from animal waste. They can also be used as alternatives to porous stones or stainless-steel injection nozzles typically used for ozone injection in water purification applications. This would provide ozone injection over a wide area, eliminating the need for more costly multiple stones or injection ports. 

Markel Corp.
435 School Lane
Plymouth Meeting, PA 19462
tel: 610/272-8960

Copyright ©2004 Medical Product Manufacturing News

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