technology composite EMI/RFI shielding materials
that give design engineers
VI is a premium grade conductive silicone
gasketing material containing a uniform dispersement of microscopic conductive
particles. It will withstand the most severe environments without degradation
of electrical or physical performance over a frequency range of 10 kHz to 12.4
Designed For Exacting
Multi-Point VI materials are produced in a uniquely wide
choice of conductive particles and silicone elastomers ranging in hardness from
40 to 80 Shore A durometer. As a result, the design engineer has maximum
freedom in selecting the material that provides the best combination of
shielding effectiveness, environmental protection and economy for his specific
Conductive Particles For All
A significant design characteristic engineers
must evaluate when selecting a conductive compound is the environment in which
it will operate. Multi-Point VI gasketing
is available with a selection of conductive particles to meet varying
performance requirements at operating temperatures to 200°C and beyond.
provides the best
performance at temperatures to 200°C. Shielding effectiveness in excess of
70 db is possible with this material.
(silver plated nickel
particles) provides performance which compares favorably with pure silver
compounds, also to 200°C, and is suitable for similar
(silver plated copper
particles) is a 135°C material which offers excellent performance. It is
intended for retrofit applications where similar silver plated copper materials
have been specified and qualified.
||Multi-Point VI-SPG (silver plated inert particles) is intended for applications where
the cost of silver or silver plated metal fillers is prohibitive but silver
performance is required. The material is rated for 180°C operation where
greater than 60 db of shielding is required.
||Multi-Point VI-NP (nickel particles) is a 200°C, full frequency range material
which will provide 45 db of shielding effectiveness. It is not affected by salt
spray environments as the silver compounds are.
||Multi-Point VI-CP (carbon particles) is recommended for use below 5 GHz in
non-military applications. Where it meets performance requirements, its low
cost makes it attractive.
Multi-Point VI elastomers provide
complete environmental sealing. The wide range of elastomer durometers assures
an effective seal even where there is large unevenness between the mating
surfaces. Compression set is minimal. Fluorosilicone compounds are available
for applications involving contact with chemical solutions, organic or
inorganic oils or fluids.
Salt Corrosion Resistant Compounds
Where the shielding material must operate in a salt
spray environment, design engineers can eliminate problems caused by the
corrosive effect of salt spray on silvered particles by specifying Multi-Point
Fully Bonded Gasketing
In some applications, improved design integrity is achieved by fully
bonding the gasketing directly to the parts by a vulcanizing process.
Vulcanizing, in which CSI essentially forms gaskets in place by permanently
heat bonding directly to one of the mating surfaces, further assures repetitive
quality in limited space areas where conductive adhesives would normally be
Product Configurations For All Applications
gasketing is available in sheets, extruded strips and molded or rule die cut
parts. A wide range of sizes, thicknesses and configurations can be provided to
meet specific design needs. Materials are available with pressure sensitive
adhesive backings for ease of installation.
Selection Guide, the design engineer can specify the
material that best meets his environmental and shielding effectiveness
Multi-Point VI waveguide gaskets
are available in a wide range of EIA sizes as well as in special
configurations. They provide shielding effectiveness in excess of 75 db through
a frequency of 12.4 GHz and are usable to 26.5 GHz and beyond.
waveguide gaskets are reinforced internally with a metal screen that prevents
cold flowing under high compression loads. Typical applications include cover
flanges and flat contact flanges.
Molded waveguide gaskets are produced in
precise shapes of a rectangular or circular configuration with "O" or "D" cross
sections. Typical uses are as gasketing for choke flanges and grooved contact
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