Knitted Wire Mesh
Description
Knitted wire mesh offers excellent EMI shielding performance, providing continuous electrical continuity when compressed between two mating surfaces. The product can be manufactured in a combination of four different wire types; Monel, T.C.S., Aluminium and Stainless Steel. For EMP applications the TCS wire type is particularly suitable.
Knitted mesh gaskets are best used in applications where they are clamped between panels which are to be fixed permanently. Once compressed, it is unlikely to recover fully to its original state. For applications where a more resilient EMI gasket is required, we recommend using Elastomer cored wire mesh, see below. Knitted mesh gaskets are not suitable for applications where environmental sealing is a requirement.
The product can be supplied on reels in a continuous length, as strips cut to size or as fabricated gaskets. They can also be used to make O-rings, compressed mesh washers and mesh slugs, etc.
Applications
- Applications which require high shielding effectiveness and ESD control
- Applications where the gasket must conform to an irregular surface.
- Panel gaskets, cable wrapping, door gaskets and static discharge washers.
Availability
- Fabricated gaskets to drawing.
- Continuous lengths up to 10 metres long.
- Self adhesive backing is available but not recommended.
- A large range of materials to suit many RFI/EMI/EMP conditions.
- Large fabricated gaskets can be produced
Design Considerations
If producing gaskets yourself, consideration should be given to the termination of cut mesh ends. Sometimes loose wires are evident after cutting. Loose wires can be avoided by either dipping the end in glue, spot welding or sewing the cut mesh end.
Compression forces required to achieve good contact and the rigidity of the host metalwork.
Choice of shielding mesh should take into consideration the type of metals being interfaced to ensure compatibility and the attenuation required.
This material type can require relatively high closure forces, therefore it is important to ensure that covers/flanges are sufficiently rigid and that fastener spacing is not so large as to cause poor sealing due to distortion of the sealing faces.
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