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Microwave absorber foam

microwave absorber foam icon 1


Specify the length in mm. 3500 max. 1000 mm - 3501 max. 355 mm
Specify the length in mm. 3500 max. 1000 mm - 3501 max. 355 mm

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 is 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 be able 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.

Part number examples
Part number Features
3500 (soft version) Max. sheet size 1000 x 1000 mm
3501 (hard version) Max. sheet size 555 x 355 mm
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 with thicknesses of 3, 6, 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 your drawing. please contact us with your drawing with the desired quantities for a quote.

3500 series - Reflection loss

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
Property ISO Unit IP 45
Density 845 Kg/m3 42 - 48
Tensile strength 1798 kPa 298-337
Elongation strength 1798 % 30 - 41
Compression deflection strength 844 kPa  
25% 844 kPa 55 - 75
50% 844 kPa 123 - 145
24h 1856 % 6.0
Working temperature range   Celcius -60/+80
Thermal conductivity at 0 degrees Celcius 8301 W/mK 0.04
Water absorption 7 days   Vol. % <1
Flammability FMVSS302   Pass
Surface resistivity IEC-61340 Ohm 10^7
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