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 Ultra-Vanshield®
RFI-EMI shielding gaskets are manufactured from the most
versatile, long-life materials to provide the highest
performing alternatives for the life of your product.
To take full advantage of the inherent properties of these
materials, a few simple guidelines should be followed
for the continued, long-term effectiveness of both the
mechanical and electrical properties. |
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Conductive plastic enclosure seam
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Electrostatic discharge (ESD)
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1. Determine proper size and shape
The gasket's "compressed configuration" is important
to consider, regarding the width of the mounting area relative
to the compressed width of the gasket.
Consider various profiles and sizes, and mechanical stability
required; such as, when the gasket must resist shear forces.
2. Compression range required
Ultra-Vanshield® gaskets require
only a minimum of deflection to achieve full shielding effectiveness.
Conversely, since mating surfaces of an enclosure may vary
in spacing along their length, consider the maximum separation
distance to be connected by the gasket (see drawing below).
The gasket's deflection should be between 10%-30% of its relaxed
height, and not more than 50%. If too much compression is
occurring, change to the next smaller size gasket.
3. Attachment methods
Ultra-Vanshield® gaskets offer
the widest range of attachment alternatives. The most common
methods are shown below.
4. Shielding effectiveness
Shielding effectiveness is determined by the largest gap opening
in an enclosure seam or aperture. This is known as the "slot
length".
As "slot length" decreases, shielding effectiveness
increases.
Usually, the shielding gasket is continuous along the entire
length of the opening. If a discontinuation is necessary;
i.e., for hinges, locks, fasteners, etc., refer to figure
6, to calculate the expected shielding effectiveness according
to the length of the discontinuation (or slot length).
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