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GN 7404 Two-Way Breathable Membranes Stainless Steel, Oil / Water Repellent (Hydrophobic / Oleophobic)


GN 7404 Two-Way Breathable Membranes, Stainless Steel

Product Family Stainless Steel

Standard parts made of rustproof stainless steel have been designed for use in the food sector, in the chemical industry, for aggressive ambient conditions or for outdoor use.

  • corrosion-resistant
  • precise fit
  • environmentally friendly
Show all Stainless Steel products

Product description


Two-way breathable membranes GN 7404 are used when constructing housings and equipment. When installed in the wall of a housing, they can be used to equalize the pressure between the interior of the housing and the surrounding area.

Any dirt, dust, oil, or water in the gaseous medium is kept out. This prevents dirt and moisture from entering the interior of the housing and prevents oil from dripping into the surrounding area.

In order to protect the membranes, they should not be completely covered with oil or water, and the differential pressure/air permeability volume should not be exceeded. They should be installed on the side/vertically in a protected position.

The external diameter of the housing with the recessed hexagon is designed for tapped plates for tube fittings DIN 3852.

The seal is embedded in a recess on the planar side. This prevents it from being lost and squeezed outwards during the tightening process.

Assembly instruction:
For mounting on walls of less than 4 mm thickness please use mounting nuts GN 7430.


Stainless steelNI AISI 303

Non-woven nylon material /
Acrylic copolymer wetting

Membrane enclosure
Plastic (Polyamide PA)

  • Glass fiber reinforced
  • Temperature resistant up to 100 °C

Protective strainer
Stainless steel AISI 304

Seal / O-ring
Rubber NBR (Perbunan®)



Mounting Nuts GN 7430

On request

Body in brass
Other membrane pore sizes

Technical drawing

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GN 7404 Two-Way Breathable Membranes, Stainless Steel sketch

Article options / Table

Show / Hide columns
pore size
in µm
Differential pressure Δ 1  bar 
Air permeability volume
in l/min
G 1/2M 20 x 1,526108,57,5231.211
G 3/4M 26 x 1,5321498301.221
G 1M 33 x 1,54020118,5361.234

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Thread d1
Thread d1
Membrane pore size

Membrane structure – Materials

The membranes use a non-woven nylon material as a substrate with a completely unordered structure. The minuscule pores of the membrane are created by fully saturating the fibers with an acrylic copolymer, which does not fill the gaps in the material.

The material and process parameters affect the size of the pores during manufacturing, which can be between 0.2 and 10 μm. Porometry can be used to determine the quality of the membrane. This is a rating procedure which assesses, among other things, the distribution of the sizes of the membrane pores and air permeability. A microscopic image of the cross-section of a membrane is shown here.

Foto - Membranquerschnitt

For comparison: The minimum mesh width of a filter manufactured using economically viable methods is 50 μm.

Membrane, microscopic images,
2000x magnification

Functionality – Service conditions – Installation position

The membranes repel oil and water because of their materials and surface structure. This prevents water and oil droplets from completely suffusing the membrane surface. These properties are supported by installing the membrane on the side in a vertical position.

If the membrane is covered in exceptional circumstances, small quantities of oil or water can be pushed through the membrane due to the pressure differential. Once the situation has been rectified, the oil and water will drip off and the membrane will be fully functional.

Technical parameters

The maximum air permeability volume, the maximum pressure differential, and the maximum rated/burst pressure are all important when using membranes. There is a linear correlation between the air permeability volume which can be achieved and the differential pressure, which should not exceed 1 bar.

Air permeability volume dependent on differential pressure

Differential pressure, burst pressure

Skizze Luftdurchlassvolumen Skizze 2 GN 7404


Thermal -

The membrane enclosure may not be used in temperatures exceeding 100 °C. The membrane itself can resist temperatures of up to 150 °C.

Chemical -

The membranes are resistant to a wide range of chemical substances frequently used in mechanical and automotive engineering, e.g., oils, fuels, organic solvents, and alcohols. A tolerability test should be performed if you have any doubts.

Selected Part (How to order)

Total (net)
plus VAT 2,25 €
gross 14,10 €
In stock
incl. material surcharge: 0,24 €
The material surcharge is already included in the price.
Weight: 0,023 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone +49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances).
Please note our order discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 49,99 €
All prices in accordance with our price list No. 55, valid from 1 September 2022, plus VAT only valid for Germany.

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