Microwave Absorber Foam

Microwave absorber foam

 Microwave Absorber Foam 3500

Used at higher frequencies than traditional shielding and can also be used with other EMI/RFI shields to extend frequency range

These absorbers can be used at higher frequencies than traditional shielding and can also be used with other EMI/RFI shields to extend frequency range.

The microwave absorbers can be installed easily with Pressure-sensitive Adhesive (PSA), often directly onto high-frequency board-level components, to absorb unwanted radiated and surface-wave EMI/RFI and to meet FCC requirements without shielding.

Our 3500 series Microwave absorber foam is RoHS compliant. It is a coated open-cell foam and used as a microwave absorbing material, especially for applications with frequencies of 1 to 17 GHz. The product acts like a free-space resistor to incoming electromagnetic energy.

The 3500 series Microwave absorber foam is available in a soft (3500) and a hard (3501) variant. The type you choose depends on the force you want the foam to withstand, if necessary.

Microwave absorber products can solve EMI/RFI problems without additional shielding and enable advanced technologies including automotive radar, military, and commercial wireless applications.

Typical applications:

  • Antenna hats
  • Test boxes
  • PCB shielding/housings
  • Military applications
  • EMI reduction
  • Antenna pattern shaping
  • Radar cross reduction.


  • soft version (3500) which can be easily compressed to 75% is available as die cut or in the form of sheets. The soft microwave absorber sheets are available in thicknesses of 3, 5, and 15 mm and with or without PSA (pressure-sensitive adhesive).
  • hard version (3501) which can carry more weight and keeps its shape and position more easily is available with a thickness of 6 mm. Other thicknesses are available on request.


Microwave absorber foam, soft version:

Standard sheet
Temperature specification: – 40°C to +100°C
Hardness shore: 40 +/- 20 
Die-cut: Material can be cut into any shape according to customer’s drawing. For a quote, please send a drawing with the desired quantities to info@japanhomeland-security.jp .


Part number examples:

Part numberFeatures
Standard sheet size:
555×355 mm
or 355×255 mm
3500/3501-x-xFoam customized settings
Max. sheet size 1000×1000 mm

3500 series – Reflection loss


Please note: These values are measured under laboratory conditions. Results may vary in other situations; please read our Guarantee.

Product specifications

PropertyISOUnitIP 45
Density845Kg/m342 – 48
Tensile strength1798kPa298-337
Elongation strength1798%30 – 41
Compression deflection strength844kPa 
25%844kPa55 – 75
50%844kPa123 – 145
Working temperature range Celcius-60/+80
Thermal conductivity at 0 degrees Celcius8301W/mK0.04
Water absorption 7 days Vol. %<1
FlammabilityFMVSS302 Pass
Surface resistivityIEC-61340Ohm10^7

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