GS8000 Datasheet, PDF (2/4 Pages) Gennum Corporation – DVI / HDMI Extender

GORE® EMI Shielding
MATERIALS
GS8000 SERIES — Gaskets
and Grounding Pads
Extended Service Heights
The GS8000 Series of GORE^® EMI Shielding Materials performs well
in both grounding and EMI shielding applications. Gore recommends
using each variant within a range of service heights (gap distances).
For shielding applications, Gore recommends a smaller service height
range than for grounding applications to ensure a robust EMI seal.
The low closure force and broad range of tolerance take-up results in
multiple product choices for some gap distances. Selecting the most
suitable variant for a given application depends on:
1. Gap distance of the housing that needs to be filled
2. Compression force required to achieve the specified gap distance
3. Required DC resistance for grounding applications (or required
shielding effectiveness for shielding applications) at a specified
gap distance
Figure 1 and Figure 2 show recommended service heights (gap
distances) for each variant.
Pressure and DC Resistance
Three of the variants among the GS8000 Series provide conductivity
when compressed to 0.6 mm (0.24 in); however, the amount of
pressure and DC resistance varies for each. Table 2 shows the values
for each of these three variants.
Table 2: Pressure and DC Resistance Values
at 0.6 mm Gap (data taken from Figures 3 – 6)
Variants
GS8000-063
GS8000-095
GS8000-126
Pressure Required (psi) DC Resistance (ohms)
15
0.03
55
0.02
75
0.01
Figure 1: Recommended Service Heights for Use
in EMI Gasket Applications
1.50
1.35
1.40 mm @ 5 psi
1.20
1.05
0.90
0.85 mm @ 20 psi
0.75
0.60
0.45
0.30
0.15
0.00
0.60 mm @ 15 psi
0.30 mm @ 50 psi
0.60 mm @ 75 psi
0.50 mm @ 100 psi
0.30 mm @ 95 psi
0.15 mm @ 325 psi
GS8000-03X GS8000-063 GS8000-095 GS8000-126
GS8000 Series
Figure 2: Recommended Service Heights for Use
in Grounding Pads
2.40
2.25
2.10
1.95
1.80
1.65
1.50
1.35
1.20
1.05
0.90
0.75
0.60
0.45
0.30
0.15
0.00
2.20 mm @ 1 psi
1.20 mm @ 5 psi
1.40 mm
@ 5 psi
0.90 mm @ 5 psi
0.85 mm
@ 20 psi
0.45 mm @ 10 psi
0.30 mm
0.60 mm
@ 15 psi
0.60 mm @ 75 psi
0.50 mm @ 100 psi
@ 50 psi _{0.30 mm @ 95 psi}
0.15 mm @ 325 psi
GS8000-03X GS8000-063 GS8000-095 GS8000-126
GS8000 Series
Table 3: Product Specifications (measured on 5 x 5 mm grounding pads)

Variants
Weight
Compression Stop
(g)
mm (in)
Pressure to Achieve
Compression
(psi)
Initial DC
Resistance
(ohms)
Recovered
Thickness
mm (in)¹

High
0.45 (0.018)
10
GS8000-03X
0.008
Recommended
0.30 (0.012)
50

Low
0.15 (0.006)
325

High
0.90 (0.035)
5
GS8000-063
0.010
Recommended
0.60 (0.024)
15

Low
0.30 (0.012)
95

High
1.20 (0.047)
5
GS8000-095
0.011
Recommended
0.85 (0.033)
20

Low
0.50 (0.020)
100

High
2.20 (0.087)
1
GS8000-126
0.013
Recommended
1.40 (0.055)
5

Low
0.60 (0.024)
75
0.245
0.125
0.015
0.070
0.025
0.007
0.115
0.040
0.010
0.240
0.150
0.012
0.56 (0.022)
0.38 (0.015)
0.25 (0.010)
1.19 (0.047)
0.91 (0.036)
0.51 (0.020)
1.65 (0.065)
1.24 (0.049)
0.74 (0.029)
2.62 (0.103)
1.90 (0.075)
0.94 (0.037)
1 _{To measure the recovered thickness, samples were compressed to the compression stop. While compressed, the samples were subjected to a 70°C temperature soak for 70 hrs per ASTM}
D395B. Lastly, the samples were released from compression and allowed to recover for 30 minutes before the recovered thickness was measured.
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