EMI / RFI Shielding Mesh is used for attenuating electromagnetic and radio-frequency interference through vents, windows and enclosures while still passing air and light. MIL-DTL-83528 is the reference cited for it on drawings, datasheets and purchase orders.
What MIL-DTL-83528 Means for EMI / RFI Shielding Mesh
The dimensions in the table below are supplied to suit MIL-DTL-83528. Where the standard sets requirements for the finished appliance, device or system, compliance testing of that assembly stays with its manufacturer; we supply the metal mesh part to the drawing and can provide material certificates and dimensional reports with the shipment.
EMI / RFI Shielding Mesh Dimensions
| Mesh count | Wire diameter (mm) | Aperture (mm) | Open area (%) | Material | Shielding @ 1 GHz (dB) |
|---|---|---|---|---|---|
| 22-Mesh | 0.115 | 1.040 | 81 | Copper | 50 |
| 60-Mesh | 0.110 | 0.313 | 55 | Copper | 65 |
| 100-Mesh | 0.110 | 0.144 | 32 | Phosphor bronze | 75 |
| 100-Mesh Monel | 0.110 | 0.144 | 32 | Monel 400 | 75 |
| 145-Mesh | 0.056 | 0.119 | 46 | SS304 | 70 |
Specifying EMI / RFI Shielding Mesh Beyond the Standard
- Frequency range: Finer mesh and thicker wire raise attenuation at higher frequencies; state the band to be shielded.
- Conductivity & corrosion: Copper and phosphor bronze conduct best; Monel 400 and stainless resist corrosion in marine or outdoor use.
- Bonding: Specify a continuous, low-resistance perimeter bond — the mesh only works when grounded all round.
When EMI / RFI Shielding Mesh Is Not the Right Choice
Not a fire, thermal or ballistic barrier — combine with other materials where those properties are needed.
