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Form-In-Place Gasket
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In our new Trishield EMI gasket we have
succeeded in combining properties which together make the
product unique. Thanks to our new dispensing technology
we can offer a gasket with 15 db better shielding, 30 percent
lower compression force and a 10 to 13 percent lower price.
Trishield is the result of many years of development work.
Our aim has been to find the optimal material and the functionally
best gasket shape. With Trishield we have succeeded.
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Dimensions |
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Trishield is available in all dimensions
from 0.5 mm to 3.0 mm . (Other dimensions can also be supplied
to meet special requirements.) The width is generally the
same as the required height. The gasket is triangular, so
the width is smaller at the top of the gasket. Trishield's
properties are at their best in a high, narrow gasket. Here
are some examples of common dimensions in free and compressed
condition.
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Product code purchased
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Dimensions for beads
(mm)
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Filler
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h nom
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w max
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Trishield 8800
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1.2
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0.8
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Ag/Ni
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Trishield 8800
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1.6
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1.1
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Ag/Ni
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Trishield 8800
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1.8
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1.2
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Ag/Ni
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Trishield 8800
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2.4
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1.6
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Ag/Ni
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Compression set
properties |
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Compression set is the permanent deformation
of the material after compression. It is measured according
to ISO 815 and with a gasket height of 1.6 mm . The gasket
is compressed 25 % for about 72 hours at 85 ¢XC . With Trishield
technology, a level of about 17 % can be achieved.
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Corrosion properties |
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The diagram below shows little difference
between aged or non-aged material for the Trishield material.
If the material retains excellent shielding properties after
ageing, it has good ageing properties.
¡° Shielding effectiveness comparison:
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Bleeding |
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In tests, the gasket is compressed 25
% for 22 hours against a piece of white paper. Trishield showed
no signs of leakage.
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Compression forces |
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A lower compression force can be used
with Trishield technology, because of its geometry and the
fact that it contains less material that earlier gaskets.
Trishield gives about 30 % lower compression force than earlier
dispensing materials. In percentage terms you gain more with
a thicker gasket. See the table below.
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Gasket
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Force
@10% defl.
N/cm
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Force
@20% defl.
N/cm
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Force
@25% defl.
N/cm
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Force
@30% defl.
N/cm
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Force
@50% defl.
N/cm
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Trishield
8800
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3,0
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6,1
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7,7
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9,6
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30,1
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8700
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2,9
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7,5
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10.2
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13.6
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57,7
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Shielding properties |
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Trishield technology orients the particles in the gasket
for better contact with each other. This gives better shielding
capacity for the same amount of filler. This means improved
shielding and today's level of conducting particles.
Another option is a lower degree of filler in the gasket and
shielding equal to today's level. This gives even lower compression
forces and a lower price. Depending on application this can
be varied from case to case. The diagram shows the shielding
capacity before and after ageing of the materials 8700 och
Trishield 8800.
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The cost picture |
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Trishield technology makes better use
of included components that today's systems. Machine time
and consumption of materials are reduced. Because of its higher
technical level, the material is slightly costlier to produce.
Overall, Trishield give a better price for a gasket with a
given height and length.
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