Gore-Shield
gs8000 emi gaskets
®
Soft and Highly Conductive
Summary
GORE-SHIELD
®
GS8000 EMI Gaskets are ideal for applications that
require conformability, excellent cavity-to-cavity EMI shielding, and
superior conductivity at low compressive forces.
GORE-SHIELD
®
GS8000 EMI Gaskets are supplied as precision die-cut
parts on rolls for high-volume assembly. This material is ideal for
the cellular phone, PDA, and mobile electronics markets.
GORE-SHIELD
®
GS8000 EMI Gasket consists of a nickel-plated
conductive polyurethane foam, a conductive pressure sensitive
adhesive, a copper foil, another conductive pressure sensitive
layer, and a PET carrier film (see Figure 1).
Features and Benefits
• Low DC resistance and high shielding effectiveness
• Excellent reliability through Accelerated Life Testing (ALT)
• Conformable and highly compressible with low force
• Increases functional space by reducing fixing points
• Minimizes stress on housing and circuit boards
GS8000 Nominal Properties
Property
Composite Thickness
GS8000-063
GS8000-126
Die-Cut Part Thickness
GS8000-063
GS8000-126
GS8000-063
GS8000-126
Pressure to
Compress to RCS*
Shielding
Effectiveness at
RCS*
Temperature Limit
1.0mm
2.3mm
0.3 to 0.5mm
0.8 to 1.0mm
See Chart 1
>80
dB
See Chart 1
–45°C to 85°C
EM2WIIN T-1055
Modified ARP-
17053
Measured Optically
Measured Optically
1.6±0.25mm
3.2±0.25mm
Measured Optically
Measured Optically
Nominal Value
Test Method
Applications
EMI shielding for mobile phones, wireless PDAs, or other portable
electronic devices.
Design Considerations
When optimizing a gasket shielding solution, consider the housing
design as well as the EMI gasket performance.
Important considerations in the housing design include flatness,
material type, rigidity, contact area, tolerance take-up, conductivity,
fastener type, and fastener locations.
Key factors in an EMI gasket include softness, tolerance take-up,
conductivity (DC resistance), and shielding effectiveness both
before and after Accelerated Life Testing (ALT).
Gore application engineers can provide expert design assistance
and rapid prototyping for your EMI shielding solution needs. Please
contact Gore for additional information.
Recommended Compression Stop (RCS)
*Recommended Compression Stop
Figure 1
Conductive Polyurethane
Foam
Conductive Pressure
Sensitive Adhesive
Copper Foil
Conductive Pressure
Sensitive Adhesive
PET Carrier Film
Gore-Shield
gs8000 emi gaskets
®
Chart 1
120
GS8000-063 Stress
GS8000-126 Stress
GS8000-063 1.0 GHz
GS8000-126 1.0 GHz
GS8000-126 RCS
Test
Equipment
Limit
GS8000-063 RCS
600
(87.0)
500
(72.5)
3D Comparison of Conductivity
GS8000
1.00
0.75
0.50
0.25
0.00
Ohms
100
Shielding Effectiveness, dB
60
300
(43.5)
200
(29.0)
100
(14.5)
0
0.2 mm
.008 in.
40
20
0
2.0
.079
Stress kPa (psi)
80
400
(58.0)
1.8
.071
1.6
.063
1.4
.055
1.2
1.0
0.8
.047
.039
.031
Compression Gap
0.6
0.24
0.4
.016
2mm
2
pads
GS8000
Form in Place
Silicone Elastomer Gasket
GORE-SHIELD
®
GS8000 EMI Gaskets
Combines softness AND excellent conductivity to provide superior cavity-to-cavity shielding
DC resistance of a GS8000 gasket between a nickel-plated
ABS housing and a gold segmented PCB ground trace.
4 corner screws (no screws in center)
Units = ohms unless otherwise specified
DC resistance of a hard gasket between a nickel-plated ABS
housing and a gold segmented PCB ground trace.
4 corner screws (no screws in center)
Units = ohms unless otherwise specified
Open Circuit (> 1 kOhm)
0 Resistance
0.25
No Data
0.5
Above High
0.75 High Resistance (1)
Open Circuit (> 1 kOhm)
0 Resistance
0.25
No Data
0.5
Above High
0.75 High Resistance (1)
GORE-SHIELD
®
GS8000 EMI Gaskets have excellent, consistent electrical
performance because of softness and the ability to take up tolerances.
All 2mm2 pads measure
<0.25
ohms.
Form-in-place silicone elastomer gaskets do not conduct at increased
distance from compressive screws/clips. Open circuits form on pads far from
compressive screws.
RoHS Status
RoHS Material*
Lead (Pb) Content
Cadmium (Cd) Content
Hexavalent Chromium (Cr6)
Content
Mercury (Hg) Content
Bromine (Br) Compounds
Pass/Fail
Pass
Pass
Pass
Pass
Pass
*W. L. Gore & Associates declares that we do not intentionally add substances listed in
Directive 2002/95/EU to GORE-SHIELD
®
GS8000 EMI Gaskets. Independent lab tests
have been performed and results are available upon request.
North America
1 (800) 445-GORE (4673)
gore.com/emi
More international phone
numbers can be found at
gore.com/phone
Japan
+81 33 570 8712
Korea
+82 2 393-3411
Taiwan
+886 2 8771 7799
Singapore
+65 6 733 2882
JK060105-01
Europe
+49 9144 6010
+44 1382 561511
International
1 (302) 292-5100
China: Beijing
+86 10 6510 2980
China: Shanghai
+86 21 6247 1999
China: Shenzhen
+86 755 8359 8262
Rev. 6-7-07
W. L. Gore & Associates, Inc.
GORE and designs are trademarks of W. L. Gore & Associates, Inc. ©2006 W. L. Gore & Associates, Inc.
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