Our conductive silicone gaskets are constructed from silicone containing metal powder fillers which combine to produce high levels of attenuation with excellent environmental shielding and a high level of conductivity. Many types of filler, from nickel to pure silver, are available to suit a wide range of applications. There are also Fluorosilicone variants for use in the presence of hydrocarbon contamination.
Conductive silicone EMI shielding gaskets and materials were originally developed for high performance shielding mainly for military applications. However, the introduction of lower cost fillers has now made them accessible to the commercial sector. They are used where environmental and EMI shielding is required but space constraints or stringent environmental protection necessitates a small cross section profile, often fitted into a groove or channel.
Conductive silicone is best used where mating surfaces are smooth and well machined. They should be mounted to provide adequate voulme for the material to deflect under pressure and should be compressed by between 8 and 20% of their relaxed height for solid sections and between 20 and 100% of the height of the hollow centre of tubular sections. Moulded 'O' rings, gasket profiles and sheet materials all have their own compression characteristics according to how they are mounted and do not comply with the guidelines above.
To discuss your specific application, please contact us.
|Filler||Test Method||Nickel Graphite||Silver Glass||Silver Aluminium||Silver Copper||Silver Pure||Carbon|
|Upper Operating Temp. Degrees C||+160||+160||+160||+160||+160||+160|
|Lower Operating Temp. Degrees C||ASTM D-1329||-50||-50||-50||-50||-50||-50|
|Specific Gravity (±5%)||ASTM D-792||1.99||1.75||2.00||3.02||3.20||1.19|
|Hardness Shore A (±5)||ASTM D-2240||60||60||65||60||75||70|
|Elongation % (min)||ASTM D-412||100||80||175||100||100||150|
|Compression Set %||ASTM D-395||30||30||30||30||30||20|
|Tensile Strength Mpa (min)||ASTM D-412||1.00||0.90||0.90||1.00||1.25||5.00|
|Volume Resistivity ohms/cm (max)||0.1||0.05||0.008||0.008||0.002||9.00|
|EMI Shielding Effectiveness (dB)||MIL-G-83528 MIL285|
|200 KHz (H-Field)||70||55||70||75||70||30|
|100 MHz (E-Field)||95||95||110||110||115||65|
|500 MHz (E-Field)||90||90||105||120||115||60|
|2 GHz (Plane Wave)||90||90||100||120||115||40|
|10 GHz (Plane Wave)||90||90||100||120||115||30|