Elastomer Cored Knitted Wire Mesh
Description
Elastomer cored knitted wire mesh comprises of a round or rectangular rubber core, over knitted with 2 layers of wire mesh. The knitted wire element provides EMI shielding, while the flexible core enables the gasket section to recover more readily, following repeated compression. This makes it more suited to around the doors of racks and other enclosures, where quite large levels of panel unevenness can be accommodated, and where there is a likelihood of regular opening and closing on to the gasket seal.
There are two standard elastomer materials; Neoprene or Silicone. The selection of which type is dependent on the application. It is important to consider galvanic compatibility for hostile environments. Electrical compatibility may be important in specific cases.
The selection of elastomer type is normally based on mechanical and environmental considerations, such as compressibility, operating temperature range, operating life expectancy etc. Neoprene and Silicone rubber are available in sponge or solid. Silicone has a greater tolerance of extreme temperature and also has a longer operating life.
Elastomer cored mesh can be produced in a continuous length on a reel, as cut pieces, or as a fabricated gaskets.
Applications
- Applications which require ESD control
- Applications where large areas of surface uneven-ness is present
- Doors and hatches where environmental sealing is not required.
- Doors, cabinets, and hatches where low closure forces exists
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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