
SSI's engineered electrically conductive elastomers (conductive rubber) provide
sealing solutions for mission critical applications that require both environmental
and electromagnetic interference, electrostatic discharge, and radio frequency shielding.
The incorporation of elastomers with alloys creates a multi-material compound capable
of providing electrical shielding with the superior physical properties of an engineered
elastomer. SSI's material engineering team utilizes a variety of elastomeric binders
combined with a large array of conductive fillers to custom design solutions for
all types of applications in the aerospace, semiconductor, and medical device industries.
Conductive elastomeric seals aid designers by providing a component that can
provide both environmental and electric sealing. Proper selection of the elastomeric
binder is critical for environmental conditions, and proper selection of the metal
filler is critical for galvanic capability to mating surfaces, and corrosion resistance.
SSI provides materials that meet the material properties of MIL-DTL-83528
Shielding Theory:
Electrostatic discharge (ESD)
shielding is the process of limiting electric current that flows when an excess
of electric charge, stored on an electrically insulated object, finds a path to
an object at a different electrical potential (such as ground) by separating them
with a barrier made of a lightly conductive material. Static dissipative materials
have electrical resistance between insulative and conductive materials. There can
be electron flow across or through the dissipative material, but it is controlled
by the surface resistance or volume resistance of the material.
Typical materials for ESD shielding in the semiconductor and medical device
industries include carbon-filled silicone and polyurethane blends that shield highly
sensitive electronic circuitry.
Electromagnetic interference (EMI)
shielding is the process of blocking the induction of electromagnetic radiation,
which is emitted by electrical circuits carrying rapidly changing signals, as a
by-product of their normal operation to other circuits which causes unwanted signals
(interference or noise). This is achieved by separating the circuits with a barrier
made of conductive material.
Radio frequency interference (RFI)
shielding is the process blocking radiofrequency electromagnetic radiation from
one circuit to another by separating them with a barrier made of conductive material.
This is achieved by separating the circuits with a barrier made of conductive material.
Typical solutions for EMI/RFI shielding in the aerospace and medical device
industries include gaskets and custom molded seals made from highly conductive elastomers
that bridge uneven seams in electronic packaging. Anything other than a 100% metal
to metal contact can provide gaps that allow interference to degrade systematic
performance.
Microwave
absorption is the process of absorbing microwave/radar energy at discrete and broadband
frequencies by converting the microwave/radar energy into heat. This is achieved
by magnetizing an elastomeric material by filling it with a magnetic alloy such
as carbonyl iron or ferrite.
Microwave absorbing materials/ radar absorbing materials (RAM) are frequently used
in the military industry for radar cross-section (RCS) reduction. Seals designed
from microwave absorbing elastomers are effective in reducing both EMI and RCS.
Industry Solutions: Aerospace/Military:
avionics packaging, enclosure shielding, TEMPEST requirements, radio packaging,
canopy/window perimeters, access cover plates, antenna assemblies, composite structure
gapping, missile electronics, missile canisters, and RCS reduction.
Semiconductor: semiconductor testing, robotic interfaces, chip
handling, circuit shielding, and test equipment packaging.
Medical Equipment: PET, MRI, CAT scanning equipment packaging,
display enclosures, panel doors, hand-held devices, and optoelectronics assemblies.
Products:
- Molded and Die Cut Gaskets
| - Custom Molded Seals & Shapes
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- Molded-in-place seal plates
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| - Void Cavity Fabric Reinforced Seals
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- Environmental/EMI Co-molded Seals
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