221 EMI Gaskets
Fabric-over-Foam
Laird Technologies’ Fabric-over-foam (FoF) 221 EMI gaskets provide excellent EMI shielding performance
for customers where EMI issues occur. The 221 series EMI gaskets are composed of electrically
conductive fabric wrapped around a thermo-plastic elastomer (TPE) core. They are supplied with
either a conductive or non-conductive pressure sensitive adhesive (PSA), and can be equipped with an
Extended Release Liner (ERL) on the adhesive. The 221 is a UL 94HB rated product that can be created
with cross-section profiles such as rectangle, D, knife, bell shapes, and others. The 221 EMI gaskets can
be further customized to an application by die-cutting, hole punching, notching, etc.
UL 94HB RATED NI/CU POLYESTER TAFFETA FABRIC-OVER-FOAM
FEATURES
• Fabric-over-Foam gaskets are RoHS compliant
• UL 94HB
• ow surface resistivity of < 0.07 Ω /
□
L
provides excellent conductivity
• hielding effectiveness of >75 dB across a wide
S
spectrum of frequencies
• Low compression forces allow for use of lighter
materials
• abric is highly conductive to provide good EMI
F
shielding and grounding
• aird Technologies’ proprietary coating prevents
L
fabric fraying and fingerprinting
• vailable with conductive or
A
non-conductive PSA
• any cross-section profiles available such as
M
rectangle, D, knife, bell and more
• rofile gaskets can be cut to specified lengths,
P
kiss-cut on release liner, or mitered to form
frame configurations
MARKETS
• Cabinet applications
• LCD and Plasma TV
• Medical equipment
• Servers
• Printers
• Laptop computers
• Networking equipment
• Desktop computers
• Telecommunications cabinets
FORCE/DISPLACEMENT/RESISTANCE (FDR)
0.10
4211AB221 Profile
5mm H x 10mm W
5
Resistance (ohms/ inch length)
0.08
0.06
3
0.04
2
0.02
1
0.00
0%
20%
40%
60%
80%
0
100%
% Compression
SHIELDING EFFECTIVENESS (dB)
160
140
Tested per MIL‐DTL‐83528C (Modified)
4211AB221 Profile
Shielding Effectiveness(dB)
120
100
80
60
40
20
0
30M
SE test result for 4211AB22102600 50% compression
SE test result for 4211AB22102600 30% compression
300M
Frequency(Hz)
3G
30G
USA: +1.866.928.8181
Europe: +49.0.8031.2460.0
Asia: +86.755.2714.1166
www.lairdtech.com
Force (lbs/ inch length)
4
221 EMI Gaskets
Fabric-over-Foam
ITEM
Shielding Effectiveness
30MHz-300MHz
300MHz-3GHz
3GHz-30GHz
Surface Resistivity
Compression Set @ 70 °C
Operation Temperature
Flame Retardant
Hazardous Substance
Shelf Life
UNIT
dB
VALUE
97
86
78
TEST METHOD
MIL-DTL-83528 (Mod.)*
Ω /□
%
°C
< 0.07
< 20
-40 to 70
ASTM F390
ASTM D3574*
-
UL 94HB (UL file No.E170327 designted HB001)
Compliant with RoHS (Directive 2011/65/EU)
12 months at 23°C/ 60% R.H.
* Part tested 5mm H x 10mm W rectangle
COMPOSITION OF PRODUCT
W
Conductive fabric
H
TPE foam
PSA tape (option)
PRESSURE SENSITIVE ADHESIVE (PSA TAPE) OPTIONS
Name
LT-301
LT-350
Type
Conductive PSA
PSA
Thickness (mm)
Peel strength on stainless
steel (JIS Z 0237)
0.09
0.12
> 1.3 kgf/25 mm
> 2 kgf/25 mm
Z-axis Resistance
< 0.05 Ω
-
*Other PSA can be provided. Contact Laird Technologies engineering.
Values presented have been determined by standard test methods and are typical values not to be used
for specification purposes.
ORDERING INFORMATION
PART NUMBER EXAMPLE
Digits:
1
4
2
2
3
1
4
1
5
A
6
B
-
7
2
8
2
Product
Name
9
1
-
10
0
11
1
12
4
13
0
14
0
Profile S hape & Details
Part L ength
EMI-DS-FOF-221
060215
Any information furnished by Laird and its agents is believed to be accurate and reliable. All specifications are subject to change without notice. Responsibility for the use
and application of Laird materials rests with the end user, since Laird and its agents cannot be aware of all potential uses. Laird makes no warranties as to the fitness, mer-
chantability or suitability of any Laird materials or products for any specific or general uses. Laird, Laird Technologies, Inc or any of its affiliates or agents shall not be liable
for incidental or consequential damages of any kind. All Laird products are sold pursuant to the Laird Technologies’ Terms and Conditions of sale in effect from time to time,
a copy of which will be furnished upon request. © Copyright 2015 Laird Technologies, Inc. All Rights Reserved. Laird, Laird Technologies, the Laird Logo, and other marks
are trademarks or registered trademarks of Laird Technologies, Inc. or an affiliate company thereof. Other product or service names may be the property of third parties.
Nothing herein provides a license under any Laird or any third party intellectual property rights.
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