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MODX Revolution

Expanded Monel Foil | Monex EMI Shielding Gaskets

General Information

Monex is an expanded Monel foil filled with silicone rubber. The exposed foil surface provides excellent conductivity combined with good corrosion resistance. Monex is also a 'thin' gasket medium, similar to Aluweave woven aluminium mesh, and is particularly suitable for connector or waveguide gaskets where a pressure seal and emi shield is required. The material cannot be effectively joined so gaskets should be cut in one piece wherever possible. Thicknesses of 0.5mm and 0.75mm are available and it can be supplied in sheet form.

To retain the strength of the expanded Monel foil, we recommend that a minimum land-width of 3mm should remain at any point around the edge of a Monex gasket. We also suggest that gaskets with intricate outlines are diecut at the factory.


Like Aluweave, Monex expanded Monel foil is used for connector gaskets and other 'thin' gasket applications. Mating surfaces should ideally be within ± .01mm. Where hermetic sealing is not necessary, Monex – NF is available without the silicone filler.

Monex gaskets provide good 'point contact', while the rubber filler ensures excellent environmental sealing. Monex, like nearly all other conductive gasket materials, should not be fixed with a conductive or pressure sensitive adhesive and should be fixed as a friction fit utilising the fixing screws to position the gasket before tightening.


Expanded Monel Foil | Monex EMI Shielding Gaskets


Monel Foil QQ-N-281B
Silicone Rubber AMS 3220B

Temperature range

Silicone - 55 to + 250oC


10 KHz H 52
100 KHz H 68
1 MHz H 88
1 MHz E >100
10 MHz E >100
100 MHz E >100
400 MHz P 100
1 GHz P 84
10 GHz P 42

How to order

Specify: Shielding Series-Filler Code-Thickness-Size or drawing number

Shielding SeriesFiller CodeThicknessSize
GX=Monex SX=Silicone 0005=0.5 mm xxxx-xxxx

Examples / Notes

GX-SX-0005-Drawing No. specifies a cut gasket fabricated from 0.5 mm thick Monex Expanded Monel Foil
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