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.
Standard Products
EMI Shileding Strip: Elastomer Core (1500 Series)
Rectangular Shaped Gasket – Sponge Elastomer
Monel Wire – Table 3
Tin Plated Ferrous Wire – Table 4
Round Section – Sponge Elastomer Core
Monel Wire – Table 5
Tin Plated Ferrous Wire – Table 6
Round Section – Solid Silicone Elastomer Tubing Core
Monel Wire & Tin Plated Steel – Table 7
Single Fin Section – Sponge Elastomer Core
Monel Wire – Table 8
Tin Plated Ferrous Wire – Table 9
Single Fin Section – Silicon Solid Tubing Core
Monel Wire & Tin Plated Steel – Table 10
Custom Product
Technical Information
Shielding Effectiveness vs Frequency — Table 6
Field |
Material Code -02-04 (MONEL) |
|||||||
| 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) |
|||||||
|
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
|
Material Selection Guide — Table 7
| Strip Shape | h |  |
 |
 |
 |
 |
 |
| 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 COMPRESSION 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 |