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John Castle at Nolato PPT

John Castle

STANDARD PRODUCTS

Conductive particle filled silicone

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.

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 particle filled silicone products

Applications

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 volume 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 center of tubular sections. Molded ‘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.
Conductive particle filled silicone products
Find more information, such as our standard sizes etc, in our catalogue.

CATALOGUE

Specifications

Shielding Series   EC-Q EC-G EC-J EC-H  EC-S EC-C
Filler Test Method  Nickel Graphite Silver Glass Silver Aluminium Silver Copper Silver Pure Carbon
Upper Operating Temp oC   +160  +160 +160 +160 +160 +160
Lower Operating Temp oC 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 Strenth Mpa (min) ASTM D-412 1.00 0.90 0.90 1.00 1.25 5.00
Volume Resistivity ohms/cm (max)   0.1 0.005 0.008 0.008 0.002 9.00
EMI Shielding Effectiveness (dB) MIL-G-83528 MIL285             
200KHz (H-Field)   70 55 70 75 70 30
100MHz (E-Field)   95 95 110 110 115 65
500MHz (E-Field)    90 90 105 120 115 60
2GHz (Plane Wave)   90 90 100 120 115 40
10GHz (Plate Weave)   90 90 100 120 115 30

Can't see what you're looking for?
Many of our clients require bespoke made products. If you'd like to discuss a product, please do give us a call and speak to us about your requirements.
Image on how to measure a gasket

How to measure gaskets and o-rings

Gaskets can come in various shapes and sizes. We have put together a guide to help you measure some of the most common shaped gaskets correctly. Please follow the methods to help you successfully measure a gasket.

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Material data sheets

These documents contain information on the potential hazards (health, fire, reactivity and environmental) and how to work safely with the chemical product.

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Application notes

These mini-guides have been designed to help give a quick overview of the product families, their main advantages, usual applications and points to consider during the design stages of a project.

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Product catalogues

Learn more about our extensive range of products.