1200-Metal-knit-gasket-main-image

Knitted wire mesh gaskets

Universal EMC gasket to shield lower frequencies

The Metal knit EMI/RFI shielding gaskets of the 1200 series consist of a layer of knitted electrically conductive metal wires on attached to a low-closure force rubber or elastomer core. For heavy-duty applications like EMP or high temperatures, a fully metal version is available. Sometimes a Metal knit EMI/RFI gasket is combined with an environmental seal to provide IP rating, depending on the materials used.

Knitted wire mesh gaskets provide a cost-effective solution to high shielding performance applications in the magnetic and electrical fields, including EMP. The gaskets can be made either completely from knitted metal mesh or from knitted metal mesh over an elastomer core which allows recovery after compression.

For high frequency shielding, foil-based gaskets like
Amucor Shield 6800 series will perform better, because of their much larger contact surface.


Metal knit gasket vs. Amucor shield


Contact points of Amucor shield

Contact points of metal knit gasket

Benefits

  • High attenuation for lower frequencies (low-frequency magnetic shielding)
  • Suitable for use under extreme conditions (military applications)
  • Wear resistant
  • Not susceptible to corrosion
  • Various conductive materials against tension corrosion
  • Roll lengths of 1 to 1000 meters (depending on width and height of the gasket)
  • Tools required: pair of scissors

Options (on request)

  • Custom made in the dimensions specified
  • Available with flame-retardant core
  • Available with conductive self-adhesive
  • Available with chemical-resistant rubbers like EPDM
  • Silicone sponge for high temperatures up to 220 °C
  • Cut into accurate lengths As a ready made frame


Metal knit EMI/RFI gasket in in a groove

Metal knit EMI/RFI gasket combined with water seal

Metal knit EMI/RFI gasket combined with water seal

Stock dimensions

Below are all the standard sizes we keep in stock and so are available quickly. Almost any size and combination can be produced. If you need a size that is not listed below please contact for the options and delivery time.

Round (R)

Metal knit gasket round technical drawing
D (mm) or D x d (mm)
1.6 4.8 x 3.2 9.5 x 6.4
2.4 6.4 11.1
3.2 6.4 x 3.2 11.1 x 8.0
3.2 x 1.6 7.9 12.7
4.0 8.0 x 4.8 12.7 x 9.5
4.8 9.5 14.9 x 11.1

Double round (DR)

Metal knit gasket double round technical drawing
d x w (mm)
1.6 x 9.5 3.2 x 12.7 6.4 x 15.9
1.6 x 12.7 3.2 x 15.9 6.4 x 19.1
1.6 x 15.9 4.8 x 15.9 6.4 x 25.4
2.4 x 12.7 4.8 x 19.1 9.5 x 25.4
3.2 x 9.5 4.8 x 25.4 12.7 x 25.4

Round with tail (T)

Metal knit gasket round with tail technical drawing
d x w (mm)
1.6 x 9.5 3.2 x 15.9 6.4 x 12.7 9.4 x 25.4
1.6 x 12.7 3.2 x 19.1 6.4 x 15.9 9.5 x 15.9
1.6 x 15.9 4.0 x 12.7 6.4 x 19.1 9.5 x 19.1
1.6 x 19.1 4.0 x 19.1 6.4 x 25.4 9.5 x 25.4
2.4 x 12.7 4.8 x 12.7 7.9 x 15.9 11.1 x 19.1
2.4 x 15.9 4.8 x 15.9 7.9 x 19.1 11.1 x 25.4
2.4 x 19.1 4.8 x 19.1 7.9 x 25.4 12.7 x 19.1
3.2 x 12.7 4.8 x 25.4 9.4 x 19.1 12.7 x 25.4

Rectangular (S)

Metal knit gasket rectangular technical drawing
w x h (mm)
2.4 x 3.2 6.4 x 3.2 19.1 x 12.7
2.4 x 4.8 6.4 x 6.4 20 x 6
2.4 x 6.4 6.4 x 9.5 20 x 8
3.2 x 1.6 12.7 x 6.4 20 x 10
3.2 x 3.2 12.7 x 9.5 20 x 12
3.2 x 4.0 12.7 x 12.7 20 x 20
3.2 x 4.8 15 x 6 25 x 6
3.2 x 6.4 15 x 8 25 x 8
3.2 x 9.5 15 x 10 25 x 10
4.8 x 4.8 15 x 12 25 x 12
4.8 x 6.4 15 x 15 25 x 18
4.8 x 9.5 15.9 x 9.5 25 x 20
6.4 x 1.6    

Shielding performance*

Please note : These values are measured under laboratory conditions. Results may vary in other situations; please read our Guarantee.

In house knitted wire mesh production video


Technical specifications

Material Applications
Monel
Per QQ-N-281
BS 3075 N A 13
Class A
diameter 0.11mm
The most commonly used material.
Insensitive to corrosion and neutral on the galvanic scale.
Aluminium
AMS 4187
BS 1475 5056A
Alloy 5056
diameter 0.13mm
Used in some cases for aluminium enclosures.
Aluminium can be chromed with an Al-chrome 1200 layer, if necessary.
T.C.S.
Steel core (57%)
Copper cladding (40%)
Tin plating (3%)
diameter 0.11mm
Excellent magnetic as well as electrical properties, because a Ferro alloy is covered with copper.
The outside is tinned to prevent corrosion.
Stainless steel
AISI 304
diameter 0.13mm
The strongest material with shielding performance comparable to aluminium. Highly wear resistant.

With water seal/IP seal

All knitted mesh EMI/RFI gaskets can be produced with a water seal/IP seal.

The standard material for the fluid seal/water seal is
Neoprene which can be adhesive-backed (indicated in red in the drawings) for easy installation. Alternatively, silicone sponge is also available.


Applications

Used to seal enclosure lids and doors, removable cover plates and interface gaskets for EMI shielded vent panels and EMI/RFI shielded windows.

Optimum compression/density

The maximum deflection with a sponge elastomer core is approximately 30%, with hollow extrusion 50%. This is why the hollow type is used more often. Compression levels are important in applications such as liquid filtration and noise attenuation, where flow resistance is critical.


Temperature resistance

Temperature resistance depends on the core material of the metal knit EMI/RFI gasket; ranges from -60°C up to 220°C are possible. These Metal knit EMI/RFI gaskets are insensitive to external influences and can withstand harsh conditions very well.


1250 - Knitted wire mesh washers & disks

We also supply knitted wire mesh rings/washers for seals around bolt holes. The rings can be delivered separately but can also be placed in a gasket around bolt holes for better electromagnetic seal around bolt holes.

For more information about check out our knitted wire mesh washers & disks page.


 

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General documentation

To get a quotation for Knitted wire mesh gaskets within 24 hours fill in the form below.

Select an option:
N : Not important
F : Full metal
O : Hollow full metal
C : Neoprene foam
S : Silicone
SF : Silicone foam
H : Hollow silicone tube
E : EPDM foam
Select an option:
N : Not important
M : Monel
T : TCS
A : Aluminium
S : Stainless steel
E : Steel
Select an option:
R : Round
DR : Double round
T : Round with tail
S : Rectangular
Find the sizes in the dimension table above
Select an option:
S : Standard water seal
N : No water seal
If you want the gasket with a water seal then specify the width of
the water seal in mm
* Note: The red blocks are required