Zitex® G Filter Membranes
Zitex® G exhibits the same unique characteristics as Zitex® A and also has very high water retention pressures, making it the logical choice where a highly reliabile hydrophobic vent is required. Two other properties that make Zitex G ideal as an air-PTFE dielectric for miniature coaxial cables are tensile strength and elongation, which allow easier wire wrapping without fear of breakage. Zitex G is approximately 50% air by volume and thus provides unusually good dielectric characteristics. For instance, Type G-106 has a dielectric constant of 1.5 and a dissipation factor less than .00022 at 10GHz. Zitex G is also available in perforated form with 46% open area.
Strong and tough, Zitex G can be installed in membrane holders without the need for non-PTFE polymeric backings, so there's no compromising on properties that might be important to your application.
Particle retention is also very high, especially when filtering air and other gases.
On the subject of liquid filtration, Zitex G again stands out from the crowd. Liquids may be filtered by using pressures exceeding the membrane's water initiation pressure, or with the aid of wetting agents such as ethanol.
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Property
|
Unit
|
Type
|
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G-104
|
G-106
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G-108
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G-110
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G-115
|
| Functional Pore Size |
microns |
5 - 6 |
4 - 5 |
3 - 4 |
1 - 2 |
1 - 2 |
Air Flow, 100 cc/1.0 in.2/20 oz.
(Gurley Densitometer Test) |
seconds |
1.7 ± 0.8 |
2.5 ± 1.5 |
4 - 5 |
5 - 6 |
6.5 ± 1.5 |
| Bubble Point (Ethanol) |
psi |
0.6 ± 0.2 |
0.8 ± 0.2 |
1.0 ± 0.2 |
1.2 ± 0.2 |
1.2 + 0.2 |
Water Flow Rate
Through 1 ft.2 @ 13.5 psi |
GPM |
75 ± 15 |
55 ± 10 |
40 ± 10 |
25 ± 5 |
20 ± 5 |
| Water Initiation Pressure |
psi |
2 ± 0.5 |
3 ± 0.5 |
4 ± 0.5 |
6 ± 0.5 |
6 ± 0.5 |
| Breaking Strength |
lbs./inch
width (avg) |
4.8 |
7.2 |
9.6 |
12.0 |
15.0 |
| Elongation |
% |
75 |
75 |
75 |
75 |
75 |
| Pore Volume |
% |
55 |
50 |
45 |
40 |
40 |
| Thickness |
inches |
0.004 ± 0.0005 |
0.006 ± 0.001 |
0.008 ± 0.002 |
0.010 ± 0.002 |
0.015 ± 0.002 |
| Put-Ups |
Standard width up to 10", standard length 100', 3" I.D. cores
Longer lengths are available upon request |
Zitex® G materials are available in thicknesses up to 0.25". These materials are ideally suited for gasketing applications where a compressible liner is required. These gaskets are ideal for glass-to-glass fittings, or where non-uniform sealing areas are involved. Contact us for these custom products or special formulations. Zitex G can be produced in thicknesses greater than .015".
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Call or email us for more details.
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