SIEPEL AH Multi-Layer Flat Absorber

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  • Matrix: polyether polyurethane foam with 90% open cells
  • Impregnating agents: carbon, binder, fire retardant
  • Colors: black, blue, white, green, red (other colors on request)
  • Paint: plastic coated for clean room.
  • Maximum service temperatures: - 65° C to 160° C
  • Power handling: 1600 W/m² max CW

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SIEPEL AH Multi-Layer Flat Absorber

AH is a range of flat absorbers consisting of five layers of polyether polyurethane foam with 90% open cells impregnated with a dielectric carbon solution, a binder and a fire retardant.

AH absorbers are used to cover all metal surfaces, masts and antenna bases, and also contribute to coupling reduction between antennas. The high absorption characteristics of AH are obtained with small thicknesses.


Fire resistance: NRL 8093 (Test 1, 2, 3), ISO 11925-2-Euroclass E, DIN 4102 (class B2).

Our raw materials are compliant to RoHS/REACH and free of substances in the current list of Substances of Very High Concern (SVHC) published by the European Chemicals Agency (ECHA)

Both aqueous and plastic paint coating were developed to enable work in ISO 4 (ISO14644-1 2015) clean room conditions.


AH are very flexible and easy to cut. They can be installed thanks to Neoprene glue to be applied with a brush or a pneumatic spray gun to both faces to be glued.