Mesh Over Elastomer

Series No. 1500

MAJR’s Mesh Over Elastomer EMI Gaskets offer the shielding effectiveness that can be expected from metal knitted mesh gasket while simultaneously allowing for compression in a way that isn’t found with a typical all-mesh shielding gasket. A variety of material combinations are available to choose from depending on what sort of compression and shielding characteristics your specific application requires.

MAJR provides the choice between our standard rectangular, round, round with fin, or hollow configuration to ensure that enclosures or other equipment will be RF sealed appropriately.

Overview

Wire Mesh Over Elastomer Core EMI Gaskets (1500 series) is a great choice in lower cost effective EMI/RFI shielding and environmental protection. With two covers of mesh over an elastomer, the elastomer under pressure protrudes through the mesh to give sealing protection.

To address galvanic concerns MAJR’s shielded wire mesh gaskets are provided in a variety of material compositions allowing our customers to select the most appropriate material in their application – ensuring high attenuation over time in the systems they’re installed.

Product Features:

  • Excellent Attenuation & Compression: The MAJR Mesh Over Elastomer shielding strip gives a high degree of attenuation in the H-Field and E-Field, as well as on the plane wave. The attenuation varies from over 95-100 dB in the E-Field to 35-85 dB in the H-Field while still providing excellent compression because of it’s elasotmer core.
  • Versatility of Mounting Methods: Designers have the options of using a groove design for holding the mesh over rubber strip or using the mesh fin as a convenient way of strip mounting.
  • Wide Range of Materials: The designer can choose from a wide range of materials to satisfy EMI shieldmesh requirements while providing for corrosion protection and sealing criteria. See Table 2 for materials.

Custom Product

Technical Information

Shielding Effectiveness vs Frequency — Table 6

Field

Material Code -02-04 (MONEL)
Frequency

10
kHz
100 kHz
1
MHz
18
MHz
100
MHz
400
MHz
1
GHz
10
GHz

H

35

45
65

E

95

PW

95
85
75
65

Field

Material Code -10-12 (FERROUS/Tin-Steel)
Frequency

10
kHz

100 kHz

1
MHz

18
MHz

100
MHz

400
MHz

1
GHz

10
GHz

H

45

60
85

E

100

PW

95
85
80
70

 

Pressure vs Height Deflection — Figure 1

mesh_over_elastomer_01

 

Material Selection Guide — Table 7

Strip
Shape
h mesh_over_elastomer_02 mesh_over_elastomer_03 mesh_over_elastomer_04 mesh_over_elastomer_05 mesh_over_elastomer_06 mesh_over_elastomer_07
KNIT WIRE
AVAILABLE
MONEL
ALUMINUM
SILVER-BRASS
TIN-FERROUS
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
ELASTOMER CORE
AVAILABLE
NEO-SPONGE
NEOSOLID
SIL.SPONGE
SIL.SOLID
YES
YES
YES
YES
NO
YES
NO
YES
YES
YES
YES
YES
NO
YES
NO
YES
YES
YES
YES
YES
NO
YES
NO
YES
EMI RATING 10 kHz
H-FIELD
18 MHz
E-FIELD
1 GHz PLANE
WAVE
25 to 35 dB
95 to 115 dB
75 to 100 dB
25 to 35 dB
95 to 115 dB
75 to 100 dB
25 to 35 dB
95 to 115 dB
75 to 100 dB
25 to 35 dB
95 to 115 dB
75 to 100 dB
25 to 35 dB
95 to 115 dB
75 to 100 dB
25 to 35 dB
95 to 115 dB
75 to 100 dB
ENVIRONMENTAL SEAL DUST RAIN &
DRIP PROOF
GOOD GOOD GOOD GOOD GOOD GOOD
PRESSURE SEAL 30 PSI UP FAIR FAIR FAIR FAIR FAIR FAIR
MOUNTING METHOD GROOVE
ADHESIVE
BOLT
EXCELLENT
GOOD
GOOD
EXCELLENT
GOOD
FAIR
EXCELLENT
FAIR
EXCELLENT
FAIR

EXCELLENT
EXCELLENT

EXCELLENT
EXCELLENT
MINIMUM PRESSURE 15 PSI 15 PSI 5 PSI 5 PSI 5 PSI 5 PSI
MOUNTING GROOVE
COMP. STOP
YES
YES
YES
YES
YES
NO
YES
NO
YES
NO
NO
YES
GROOVE DEPTH OR COMP-RESSION HEIGHT STRIP HT.
06 -0.25”
.25 – .50”
.50- 1.0”
85% of HT
80% of HT
75% of HT
85% of HT
80% of HT
75% of HT
75% of HT
75% of HT
70% of HT
75% of HT
75% of HT
70% of HT
75% of HT
75% of HT
70% of HT
75% of HT
75% of HT
70% of HT
TEMP.
RANGE
SIL. SOLID
SIL. SPONGE
NEO. SOL
NEO. SPONGE
-80 to 425°F
-103 to 400°F
-65 to 212°F
-40 to 150°F
-80 to 425°F
-103 to 400°F
-65 to 212°F
-40 to 150°F
-80 to 425°F
-103 to 40°F
-65 to 212°F
-40 to 150°F
-80 to 425°F
-103 to 400°F
-65 to 212°F
-40 to 150°F
-80 to 425°F
-103 to 400°F
-65 to 212°F
-40 to 150°F
-80 to 425°F
-103 to 400°F
-65 to 212°F
-40 to 150°F

Product Data Sheet

Product Options

  • Rectangular Gasket Products
  • Round Gasket Products
  • Round Tube Gasket Products
  • Single Fin Products
  • Single Fin Tube Products