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Date: 06/13/02 at 2:45 PM
Posted by: Jarod Lowry
E-mail: jmartin@texloc.com

In Reply to: flow dependence of fluoropolymers posted by Jackie Charbel on 06/12/02 at 11:39 AM:

WHAT IS MEANT BY FLOW DEPENDENCE?
ASSUMING THE QUESTION IS RELATED TO THE DISSOLVED
OXYGEN FLOWING THROUGH THE PTFE(TEFLON) MEMBRANE-LEADING TO LOW TURBITITY MEASUREMENTS, A PFA OF FEP MEMBRANE WOULD BE A BETTER CHOICE. PTFE HAS A CERTAIN DEGREE OF POROSITY DEPENDING ON FABRICATION METHODS THE OTHER FILM
GRADE MATERIALS DO NOT.

PERMEATION DATA ON EACH
MATERIAL IS AVAILABLE THROUGH THE FLUOROPOLYMER
RESIN VENDORS CUSTOMER SERVICE.

A few RESIN VENDORS:

http://www.dupont.com/
http://www.fluoropolymers.com/
http://www.3m.com/us/mfg_industrial/dyneon/index.jhtml
http://www.daikin.com/

J. Lowry
www.texloc.com

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