Datasheet

INSTALLATION
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.
Electronic enclosure door shielding gasket
Conductive plastic enclosure seam
.1 The gasket’s “compressed configuration” is important to consider,
regarding the width of the mounting area relative to the compressed
width of the gasket.
.2 Consider various profiles and sizes, and mechanical stability
required; such as, when the gasket must resist shear forces.
.1 Ultra-Vanshield® gaskets require only a minimum of deflection to
achieve full shielding effectiveness.
.2 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 at left).
.3 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.
.1 Shielding effectiveness is determined by the largest gap opening in
an enclosure seam or aperture. This is known as the “slot length”.
.2 As “slot length” decreases, shielding effectiveness increases.
.3 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 page 4, figure 6, to calculate the expected
shielding effectiveness according to the length of the discontinuation (or
slot length).
.1
Ultra-V
anshield
® gaskets off
er
the widest range of attachment
alternatives
.
The most common
methods are shown at left.
Electrostatic discharge (ESD)
Uncompressed Compressed
W
Greater
separation at
extremities of
enclosure door
(Exaggerated
for clarity)
Slot Length
of I/O Panel
Opening
Standard Optional
Pressure sensitive
adhesive,
nonconductive
Pressure sensitive
adhesive,
conductive
Hardware Dart,
press fit
Groove
For press fit
(Recommended groove
width@ 10% less
than gasket width)
Gasket with integral clip
(see "ULTRA-VANSHIELD
Clip" on page 7 for
available clip dimensions)
®
14
Ultra-Vanshield
®
RFI/EMI dual elastomer shielding gaskets
4.
SHIELDING EFFECTIVENESS
2. COMPRESSION RANGE REQUIRED
1. DETERMINE PROPER SIZE AND SHAPE
3.
A
TT
A
CHMENT METHODS