Datasheet

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EMI ESSENTIALSEMI ESSENTIALS
ELECTROSEAL CONDUCTIVE ELASTOMER
CASE STUDY
PARAMETER TEST METHOD
Filler Ni/graphite
silver/
copper
silver/Al silver silver
silver/
nickel
silver/glass carbon
Elastomer silicone silicone silicone silicone silicone silicone silicone silicone
EcE Name EcE72 EcE80 EcE81 EcE82 EcE83 EcE84 EcE85 EcE87
Electrical Properties
Volume Resistivity,
Ω cm, max
MIL-DTL-83528C
para 4.5.10
0.100 0.004 0.008 0.002 0.010 0.005 0.006 5.0
Shielding Eff, 10 GHz,
dB, min
MIL-DTL-83528C
para 4.5.12
100 120 100 120 80 100 100 30
Physical Properties
Density, g/cm
3
(±0.25) ASTM D792 2.30 3.40 2.00 3.50 1.80 4.00 1.90 1.30
Hardness, Shore A (±7) ASTM D2240 75 65 65 65 45 75 65 75
Tensile Strength, psi, min ASTM D412 280 200 200 300 150 200 200 700
Elongation ASTM D412 150% 100-300% 100-300% 100-300% 50-250% 100-300% 100-300% 100-300%
Tear Strength, ppi, min ASTM D624, die C 55 25 30 50 20 30 30 50
Compression Set, max ASTM D395 30% 32% 32% 45% 35% 32% 30% 45%
Max Oper. Temp., °C
MIL-DTL-83528C
para 4.5.15
160 125 160 160 160 125 160 160
Min. Oper. Temp., °C ASTM D1329 -55 -55 -55 -55 -55 -55 -55 -55
Flame Retardance UL 94
V-0
UL 94 HB
(File No.
E203 070
Electrical Stability
After Heat Aging,
Ω cm, max
MIL-DTL-83528C
para 4.5.15
- 0.010 0.010 0.010 0.015 0.010 0.015 7.0
After Break,
Ω cm, max
MIL-DTL-83528C
para 4.5.9
- 0.008 0.015 0.010 0.020 0.010 0.009 7.0
During Vibration,
Ω cm, max
MIL-DTL-83528C
para 4.5.13
- 0.006 0.012 0.010 0.015 0.010 0.009 N/A
After Exposure to EMP,
Ω cm, max
MIL-DTL-83528C
para 4.5.16
- 0.010 0.010 0.010 0.015 0.010 0.015 N/A
Compression / Deection,
%, min
ASTM D575 8 3.5 3.5 2.5 8.0 3.5 3.5 3.5
Fluid Immersion
1
MIL-DTL-83528C
para 4.5.17
- NS NS NS NS NS NS NS
Manufacturing Processes
molded sheet / diecut parts X X X X X X X X
molded shapes / O-rings X X X X X X X X
extruded proles X X X X X X X
Color gray tan tan beige beige tan tan black
Mil-DTL-83528 Type – A B E J L M –
MATERIAL SELECTION GUIDE
Laird offers a series of products to meet a wide range of customer requirements for military and commercial
applications. The classications of the most common materials are based on cost and specic applications and are
outlined in Table 5.
TABLE 6
1 SUR indicates meets the immersion test requirements
for 10 specied military/aerospace uids
2 UL94 V-1
3 used only for low density low hardness
4 UL94 HB
5 corrosion resistant silver/Al ller
ELECTROSEAL CONDUCTIVE ELASTOMER
CASE STUDY
TABLE 1 TABLE 4
TABLE 5TABLE 2
TABLE 3
Elastomer Type Low Temperature Upper Temperature
EPDM -58°F (-50°C) 257°F (125°C)
Silicone -49°F (-45°C) 392°F (200°C)
Fluorosilicone -67°F (-55°C) 347°F (175°C)
Material Thickness Compression Force PSI (MPA) at Deection of:
5% *10% 15% 20%
0.045 (1,1) 40 (0,3) 100 (0,7) 155 (1,1) 280 (1,9)
0.062 (1,6) 85 (0,6) 165 (1,1) 240 (1,7) 345 (2,4)
0.125 (3,2) 115 (0,8) 180 (1,2) 245 (1,7) 290 (2,0)
Cross Section Shape Deection
Flat Strip 5-10 Percent
Solid O 20-25 Percent
Solid D 15-20 Percent
Hollow O 20-50 Percent
Hollow D 25-50 Percent
Hollow P 25-50 Percent
Interference Fit 15-25 Percent
Fluid Silicone Fluorosilicone EPDM
Impermeability to
Gases
Poor Fair Good
Ozone and Ultraviolet Excellent Excellent Excellent
ASTM 1 Oil Fair Good Don't Use
Hydraulic Fluids
(Organic)
Fair Good Don't Use
Hydraulic Fluids
(Phosphate ester)
Fair Fair Excellent
Hydrocarbon Fuels Don't Use Good Don't Use
Dilute Acids Fair Good Good
Concentrated Acids Don't Use Don't Use Fair / Good
Dilute Bases Fair Good Excellent
Concentrated Bases Don't Use Don't Use Good
Esters / Ketones Don't Use Don't Use Excellent
DS-2 (Decontaminating
Fluid)
Poor Poor Good
STB (Decontaminating
Fluid)
Good Good Good
Low Temperature Excellent Excellent Excellent
High Temperature Excellent Good Good
Compression Set Good Good Good
Radiation Resistance Good Poor Good
Metal
Substrate
80
Sil AG/CU
81
Sil AG/AL
84
Sil AG/NI
85
Sil AG/
Glass
89
FSil AG/AL
92
FSil NI/
Graphite
93
Sil NI/
Graphite
96
EPDM
AG/AL
Chromated AI • • • • • • • •
Galvalume
®
• • • • • • • •
Tin Plated Steel • • • • • • • •
Zinc Plated Steel • • • • • • • •
Stainless Steel • • • • • • • •
Little to no weight loss on
metal coupon; less than
0.25%. Acceptable in all
environments.
Substantial amount of
weight loss on metal coupon;
between 0.50% and 1.25%.
Not acceptable in corrosive
environments; for less corro-
sive applications consult with
Laird applications engineer.
Moderate amount of weight
loss on metal coupon;
between 0.25% and 0.50%.
May not be acceptable in very
corrosive environments.
Extreme amount of weight
loss on metal coupon; greater
than 1.25%. Not recom-
mended in any environments.