GORE EMI Shielding
®
materials
SMT Series
Excellent electrical performance with SMT convenience
The Surface-Mount Technology (SMT) Series of GORE
®
EMI
Shielding Materials combines unsurpassed conductivity with
the convenience of SMT-compatible format. These conformable
materials are engineered to maintain consistent contact and
low DC resistance. Unlike the traditional designs of pogo pins
and universal clips that can easily break, the robust design of
the SMT Series increases durability with large contact surfaces
rather than single-point contacts. The unique construction
of the SMT Series ensures that the device maintains signal
integrity and reliable electrical performance in harsh
environments.
Because of their compatibility with SMT equipment for printed
circuit board production, the SMT Series reduces total costs.
Using these off-the-shelf materials eliminates the need for
custom designs that can increase engineering costs. Also, no
secondary processing is required, which reduces equipment
and labor costs during production. Using precise SMT equip-
ment to incorporate GORE
®
EMI Shielding Materials improves
the consistency and repeatability of PCB assembly, thus
decreasing waste.
The SMT Series of GORE
®
EMI Shielding Materials offers a
full spectrum of working ranges, making them ideal for use
as grounding pads, EMI gaskets, and antenna contacts. The
highly compressible SMT Supersoft Series delivers consistent
electrical performance with minimal force required for
initial conductivity. The SMT GS5200 Series offers the most
conductive materials under compression in Gore’s complete
product line of EMI shielding materials. In addition to these
high-performance characteristics, the SMT Series has been
tested against a variety of environmental standards (Table 1).
Benefits of GORE
®
EMI Shielding
Materials — SMT Series
•
Excellent shielding effectiveness and low DC resistance
with conformable construction
•
Reliable electrical performance achieved through
consistent contact over time
•
Reduced total costs versus custom options due to
standard sizes and compatibility with SMT technology
• Increased design flexibility with easily integrated
standard parts
•
Consistent and repeatable assembly with parts that
need no secondary processing
•
Enhanced durability due to conformable material that
maintains contact over time without compromising the
integrity of the mating surface
•
Faster production times because of standard solder
process that requires no cure time
Typical Applications
•
Portable electronic devices such as smartphones and
tablets
•
GPS and handheld scanners/readers
•
Telematics
•
Gaming devices
•
Personal computers and laptops
•
Telecommunication infrastructure
GORE
®
EMI Shielding Materials - SMT Series is covered by patent No. US 6,255,581 B1,
US 6,210,789 B1. Corresponding foreign patents issued.
GORE
®
EMI Shielding Materials - SMT Supersoft Series is covered by patent
No. US 6,255,581 B1, US 7,129,421 B2. Corresponding foreign patents issued.
PHASEFLEX
Shielding
GORE EMI
Microwave/rF TesT asseMblies
®
®
MATERIALS
Table 1: Environmental Properties
Property
RoHS Status* (lead, cadmium, hexavalent
chromium, mercury, bromine)
Flammability in accordance with UL
horizontal burn method
Value
Pass
Figure 1: Recommended Service Heights for
SMT Supersoft Series
2.30
2.20
2.30
2.10
2.20
2.00
2.10
1.90
2.00
1.80
1.90
1.70
1.80
1.60
1.70
1.50
1.60
1.40
1.50
1.30
1.40
1.20
1.30
1.10
1.20
1.00
1.10
0.90
1.00
0.90
2.2mm@18 psi
2.2mm@18 psi
1.9mm@48 psi
1.9mm@48 psi
2.2mm
@28 psi
2.2mm
@28 psi
1.9mm
@55 psi
1.9mm
@55 psi
Pass
Thickness (mm)
(mm)
Thickness
1.5mm@12 psi
1.5mm@12 psi
1.6mm@102 psi
1.6mm@102 psi
1.6mm
@82 psi
1.6mm
@82 psi
*W. L. Gore & Associates declares that we do not intentionally add substances listed in EU Directive
2011/65/EU to the Surface-Mount Technology Series of GORE
®
EMI Shielding Materials. Indepen-
dent lab tests have been performed and results are available upon request.
1.2mm@41 psi
1.2mm@41 psi
Selection Guidelines
The gaskets and grounding pads of the SMT Series are
engineered to maintain conductivity in a wide range of service
heights (gap distances). The closure force requirements and
broad range of tolerance take-up in these materials results in
multiple product options for some gap distances. Selecting the
most suitable product for a given application depends on the
following:
•
Gap distance of interfacing surfaces
• Required compression force to achieve the specified gap
distance
•
Necessary DC resistance for grounding applications or
shielding effectiveness for shielding applications at a
specific gap distance
The recommended service height for the various products in
the SMT Series differs because of their unique constructions
(Figures 1 & 2).
0.9mm@139 psi
25SMT-4442-01
25SMT-4442-03
0.9mm@139 psi
25SMT-4442-01
25SMT-4442-03
25SMT-4442-04
25SMT-4442-04
Figure 2: Recommended Service Heights for
SMT GS5200 Series
1.25
1.15
1.25
1.05
1.15
Thickness (mm)
Thickness (mm)
1.22mm
@26 psi
1.22mm
@26 psi
1.06mm
@516 psi
0.95mm
1.06mm
@903 psi
@516 psi
0.95mm
@903 psi
0.95
1.05
0.85
0.95
0.75
0.85
0.75
0.65
0.65
0.55
0.55
0.45
0.45
0.35
0.35
0.46mm@4 psi
0.81mm@13 psi
0.81mm@13
psi
0.71mm@516
psi
0.66mm
@19 psi
0.71mm@516 psi
0.58mm
0.66mm
0.59mm@1807 psi
@774 psi
@19 psi
0.58mm
0.54mm@2065 psi
0.59mm@1807 psi
@774 psi
0.41mm@387 psi
0.46mm@4 psi
0.54mm@2065 psi
0.39mm@2323 psi
0.41mm@387 psi
0.50mm Thk
0.72mm
0.84mm Thk
0.39mm@2323 psi
Thk
1.30mm Thk
1.30mm Thk
0.50mm Thk
0.72mm Thk
0.84mm Thk
Page 2
GORE
®
EMI Shielding Materials — SMT Supersoft Series
The SMT Supersoft Series is highly compressible to ensure
consistent electrical performance. These materials are con-
ductive on contact and resilient after compression (Table 2).
This combination of highly compressible construction and
minimal force requirements makes them an excellent choice
for use with metallized plastic housings and a variety of
components, including LCDs, flexible circuits, antennas,
and cameras. In addition, the SMT Supersoft Series protects
against harsh conditions like shock and vibration encountered
in applications such as handheld scanners and telematics.
The highly compressible construction also provides consistent
contact in housings that have surface variations like those in
magnesium as-cast enclosures.
Table 2: SMT Supersoft Series Specifications
1
Low Compression
Gore Part
Number
Recommended Compression
High Compression
Pressure
Pressure
Pressure
DC
Stop
DC
Stop
DC
Thickness
Length Width
Typical
Stop
to Achieve Height
Resistance
to Achieve Height
Resistance
to Achieve
(mm)
(mm) (mm) Weight Height
Resistance
(ohms) Compression
(ohms) Compression
(mm)
(ohms) Compression
(mm)
(mm)
(g)
(psi)
(psi)
(psi)
25SMT-4442-01
25SMT-4442-03
25SMT-4442-04
1
1.60
2.40
2.40
3.60 1.70 0.0219 1.50
3.60 2.50 0.0360 2.20
8.00 2.50 0.0803 2.20
0.125
0.054
0.130
12.0
18.1
27.6
1.20
1.90
1.90
0.018
0.035
0.010
40.9
48.4
54.7
0.90
1.60
1.60
0.014
0.030
0.008
138.9
101.7
82.0
Values are based on individual part geometries
Accelerated Life Testing for SMT Supersoft
Series
A crucial factor in assessing the acceptability of gasket or
grounding materials is their performance over time —
performance that can be evaluated only through accelerated
life testing. To evaluate durability of the SMT Supersoft Series,
industry testing was performed at various conditions (Table 3)
with parts soldered to a test board. Figures 3 & 4 show the
changes in DC resistance following exposure to the outlined
conditions. The minimal amount of change in DC resistance for
the SMT Supersoft Series demonstrates consistent and reliable
performance in demanding environments.
Table 3: IEC Test Standards for Accelerated
Life Testing (ALT) Conditions
International
Electromechanical
Commission (IEC)
IEC
Test Standard Standard No.
1 Cold
2 Dry Heat
3 Vibration
60068-2-1
60068-2-2
60068-2-6
Test Conditions
-65°C, 96 hours
+85°C, 96 hours
Sinusoidal 5 Hz to 100 Hz,
5g max. acceleration,
90 min. on each of the 3 axes
4 Salt Mist
Change of
5
Temperature
+35°C, 5 parts by weight NaCl
60068-2-11
and 95 parts by weight H
2
O,
24 hours
-40°C to +125°C, 30 min. @
60068-2-14
extremes, 15 min. @ 25°C,
90 min. per cycle, 25 cycles
Hydrogen sulfide (H2S) @
6 Mixed Flowing Gas 60068-2-60
100 PPB, sulfur dioxide
(SO2) @ 500 PPB, 96 hours
7 Damp Heat
60068-2-78
96 hours
+65°C, 100% humidity,
Page 3
PHASEFLEX
Shielding
GORE EMI
Microwave/rF TesT asseMblies
®
®
SMT Series
MATERIALS
Figure 3: DC Resistance through ALT for
25SMT-4442-01
25SMT-4442-01
2.00
1.80
DC Resistance (Ohms)
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
Ba
se
lin
e
1
-“
Co
ld
2
”
-“
Dr
yH
ea
3
t”
-“
Vi
br
at
io
n”
4
-“
Sa
lt
M
5
is
-“
t”
Te
m
p
Cy
cle
6
s”
-“
M
ixe
d
Ga
7
-“
s”
Da
m
p
He
at
”
Figure 6: Force Displacement Resistance for
25SMT-4442-03
2.000
1.800
1.600
DC Resistance (Ohms)
1.400
1.200
1.000
0.800
0.600
0.400
0.200
0.000
mm 2.20
in. .079
2.10
.075
2.00
.071
1.90
1.80
.067
.063
Compressed Gap
1.70
.059
1000
(145.0)
900
(130.5)
800
(116.0)
600
(87.0)
500
(72.5)
400
(58.0)
300
(43.5)
200
(29.0)
100
(14.5)
0
1.60 mm
.055 in.
Pressure kPa
(PSI)
Pressure kPa
(PSI)
700
(101.5)
Median
25
th
– 75
th
Percentile
Maximum
Minimum
Figure 7: Force Displacement Resistance for
25SMT-4442-04
2.000
1.800
DC Resistance (Ohms)
1.600
1.400
1.200
1.000
0.800
0.600
0.400
0.200
0.000
mm 2.20
in. .079
2.10
.075
2.00
.071
1.90
1.80
.067
.063
Compressed Gap
1.70
.059
1000
(145.0)
900
(130.5)
800
(116.0)
700
(101.5)
600
(87.0)
500
(72.5)
400
(58.0)
300
(43.5)
200
(29.0)
100
(14.5)
0
1.60 mm
.055 in.
Test Standards
Figure 4: DC Resistance through ALT for
25SMT-4442-03, 04
25SMT-4442-03 & 25SMT-4442-04
2.00
1.80
DC Resistance (Ohms)
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
Ba
se
lin
e
1
-“
Co
ld
2
”
-“
Dr
yH
ea
3
t”
-“
Vi
br
at
io
n”
4
-“
Sa
lt
M
5
is
-“
t”
Te
m
p
Cy
cle
6
s”
-“
M
ixe
d
Ga
7
-“
s”
Da
m
p
He
at
”
Median
25
th
–
75
th
Percentile
Maximum
Minimum
Recoverability
Recoverability is the inverse of compression set. If a device
will be opened for modifications during initial production,
hardware upgrades, or field repairs, the shielding materials
must be able to rebound and create a consistent connection.
Recoverability measures the gasket’s ability to maintain
some level of gap-filling following a release of a compression
load. Using ASTM D395 B, Standard Test Methods for Rubber
Property, Test Method B: Compression Set under Constant
Deflection in Air, the SMT Supersoft Series has demonstrated
recoverability between 96 and 97 percent (Table 4). This
high level of recoverability ensures that the electrical path
is maintained when compression is removed and then
reestablished.
Test Standards
Force Displacement Resistance of SMT
Supersoft Series
The SMT Supersoft Series provides conductivity on contact;
however, the amount of force and DC resistance differs for each
variant as seen in Table 2 and Figures 5-7.
Figure 5: Force Displacement Resistance for
25SMT-4442-01
2.000
1.800
DC Resistance (Ohms)
1.600
1.400
1.200
1.000
0.800
0.600
0.400
0.200
1000
(145.0)
900
(130.5)
800
(116.0)
600
(87.0)
500
(72.5)
400
(58.0)
300
(43.5)
200
(29.0)
100
(14.5)
Pressure kPa
(PSI)
700
(101.5)
Table 4: Recoverability of SMT Supersoft Series
Gore Part
Number
25SMT-4442-01
25SMT-4442-03
25SMT-4442-04
Recoverability
After 22 Hours of
Compression
96.1%
96.5%
96.5%
Recoverability
After 70 Hours of
Compression
96.0%
97.0%
96.9%
0.000
0
mm 1.50 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 0.95 0.90 mm
.047
.043
.039
.035
.031
.028 in.
in. .051
Compressed Gap
Page 4
GORE
®
EMI Shielding Materials — SMT GS5200 Series
The SMT GS5200 Series offers the most conductive
materials under compression in Gore’s complete product
line of EMI shielding materials (Table 5). The durability of
these materials extends their service life in challenging
environments such as ruggedized scanners/readers, gaming
devices, and wireless infrastructure. These highly conductive
materials recover easily after compression. Ideal for small
footprint applications and for metal housings, the SMT
GS5200 Series provides high performance and excellent
reliability.
Table 5: SMT GS5200 Series Specifications
Low Compression
Gore Part
Number
Recommended Compression
High Compression
Pressure
DC
Stop
Pressure
DC
Stop
Pressure
DC
Thickness
Length Width
Typical
Stop
Height
Resistance
to Achieve Height
Resistance
to Achieve Height
Resistance
to Achieve
(mm)
(mm) (mm) Weight
(ohms) Compression
(ohms) Compression
(mm)
(ohms) Compression
(mm)
(mm)
(g)
(psi)
(psi)
(psi)
25SMT-3645-13
25SMT-3645-14
25SMT-3645-21
25SMT-3645-22
25SMT-3645-31
25SMT-3645-34
25SMT-3645-35
25SMT-3645-50
25SMT-3645-51
25SMT-3645-09
25SMT-3645-10
25SMT-3645-11
25SMT-3645-17
25SMT-3645-18
25SMT-3645-25
25SMT-3645-26
25SMT-3645-27
25SMT-3645-33
25SMT-3645-40
25SMT-3645-41
25SMT-3645-43
25SMT-3645-44
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.50
0.72
0.72
0.72
0.72
0.72
0.72
0.72
0.72
0.72
0.84
0.84
1.30
1.30
5.50
8.00
5.50
8.00
3.20
5.50
8.00
5.50
5.50
5.50
8.00
5.50
8.00
8.00
5.50
3.20
5.50
3.20
3.20
8.00
1.25 0.0123 0.46
1.25 0.0176 0.46
1.10 0.0115 0.46
1.10 0.0160 0.46
1.10 0.0064 0.46
0.90 0.0088 0.46
0.90 0.0128 0.46
0.50 0.0066 0.46
0.70 0.0073 0.46
1.25 0.0158 0.66
1.25 0.0230 0.66
1.10 0.0142 0.66
1.10 0.0200 0.66
2.00 0.0400 0.66
2.00 0.0240 0.66
1.10 0.0078 0.66
1.25 0.0110 0.81
1.25 0.0100 0.81
3.20 0.0370 1.22
2.00 0.0580 1.22
1.952
1.952
1.952
1.952
1.952
1.952
1.952
1.952
1.952
0.492
0.492
0.492
0.492
0.492
0.492
0.492
0.492
0.492
1.939
1.939
0.322
0.322
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
19.3
12.9
12.9
25.8
25.8
0.41
0.41
0.41
0.41
0.41
0.41
0.41
0.41
0.41
0.58
0.58
0.58
0.58
0.58
0.58
0.58
0.58
0.58
0.71
0.71
1.06
1.06
0.014
0.014
0.014
0.014
0.014
0.014
0.014
0.014
0.014
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.003
0.028
0.028
0.003
0.003
387.1
387.1
387.1
387.1
387.1
387.1
387.1
387.1
387.1
774.2
774.2
774.2
774.2
774.2
774.2
774.2
774.2
774.2
516.1
516.1
516.1
516.1
0.39
0.39
0.39
0.39
0.39
0.39
0.39
0.39
0.39
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.54
0.59
0.59
0.95
0.95
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
0.001
2,322.5
2,322.5
2,322.5
2,322.5
2,322.5
2,322.5
2,322.5
2,322.5
2,322.5
2,064.5
2,064.5
2,064.5
2,064.5
2,064.5
2,064.5
2,064.5
2,064.5
2,064.5
1,806.5
1,806.5
903.2
903.2
12.00 1.25 0.0339 0.66
12.00 2.00 0.0500 0.66
Page 5
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