3670 series PU foam based wedge absorbers

The main advantage is to reduce the back scattering of pyramid absorbers and obtain higher quietness of quiet zone

PU foam based wedge absorbers has the properties similar to the pyramid absorbers with same height, it also has excellent performance in 100MHz-110GHz. It is mainly applied in large compact anechoic chamber and tapered anechoic chambers, the main advantage is to reduce the back scattering of pyramid absorbers and obtain higher quietness of quiet zone.

3670-200 (200 mm height PU foam based wedge absorber)
3670-200 (200 mm height PU foam based wedge absorber)


  • Such absorbers have a wedge-shaped appearance, with blue color (it can be selected as request)
  • Pliable and flexible, the pyramids won’t bend in long-term use, and its absorbing properties won’t be changed within 10 years.
  • Oxygen index ≥29% (GB/T2406-93), which belongs to flame retardant B2 level (GB8624-1997)
  • Good environmental performance, all raw materials can meet the environmental requirements, no volatile, no smell and non-toxic.
  • Working conditions: general indoor application
    • Long-time working temperature: -50°C ~ 90°C
      Short-time working temperature: -100°C ~ 120°C
    • Relative humidity: 55% ± 15%
      Frequency range: 30MHz ~ 110GHz
  • Installation method: it generally use an environmental protective adhesive to paste the absorbers on the shield body; when the absorbers’ height is below 500mm, Velcro installation can be applied; furthermore, we can also adopt the fasteners to install the absorbers, which would facilitate the replacement of absorbers and the relocation of chambers.

Schematic diagram of PU foam based wedge absorbers

Schematic diagram of 3670 series PU foam based wedge absorbers

Product specification and part numbers

Part number Base size
(mm x mm)
Pyramid quantity
per unit
Unit size
A x C  x B
(mm x mm x mm)
Standard weight
3670-200 600 x 600

6 200 × 10 × 5 8
3670-300 6 300 × 10 × 7 10
3670-495 3 495 × 20 × 7.5 15
3670-700 600*400 2 700 × 20 × 10 24

Reflection loss / Shielding performance

These values are measured under laboratory conditions.
In your situation results may differ, please read our Guarantee
Part number Reflection loss under vertical incidence
(-dB @ GHz)
Power handing capacity
0.5 1 3 6 10 18 40
3670-200   25 32 35 42 48 50 1.5
3670-300    30 38 45 48 50 50 1.5
3670-495 20 35 43 50 50 50 50 1.5
3670-700 25 40 50 50 50 50 50 1.5

Please note:

  • For the data below 500MHz, it is obtained by low-frequency coaxial test method (GJB5239-2004); while for the data above 1GHz, it is obtained by far-field RCS test method (GJB2038A-2011)
  • The performance data listed in the above table is the guaranteed data, and the measured data would be equal to or better than the guaranteed data.
  • The bold part number is a stock item and can be delivered immediately
  • Certification: CE ROHS
Holland Shielding Systems B.V. Holland Shielding Systems B.V.
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