​ETS-Lindgren's DuraSorb DSH-400H Absorber is the latest evolution of ETS-Lindgren’s low profile, hybrid anechoic absorber technology. It combines the advantages of the proven FerroSorb performance with the physical properties of the PS Series absorbers. DuraSorb is constructed using substrates with rigid, closed cell foams, which are loaded volumetrically and uniformly throughout the absorbers. DSH-400H is ideal for MIL-STD, CISPR 25 and SpaceSaver applications.

Key Product Information

Optimized Design

The DSH-400H provides a smooth transition from free space impedance to the lossy ferrite tile base. As a result of its optimized design, high performance is guaranteed not only at the lower frequency band, but also at above 1 GHz. It has a reflectivity better than -15  dB from 80 MHz to 300 MHz, and better than -20  dB at above 300 MHz. The absorption levels make DuraSorb ideal for MIL-STD-461 and CISPR 25 standards compliant rooms and can be also treated for pre-compliant semi-anechoic chambers for CISPR 16 and ANSI C63.4 standards. DuraSorb is manufactured by injecting uniformly loaded lossy materials in predetermined geometric shapes to produce the desired performance. After the lightweight substrates have been molded, they are shipped disassembled to job-sites for reduced shipping volume. Easily assembled at the site, finished absorbers are pressed and glued into a lightweight polystyrene universal mounting base on the walls and ceiling of the chamber. This method assures absorber rows are aligned with geometric precision.

Compact Size

DSH-400H is compact in size, with a 45.6 cm (17.95 in) height, and each 60 cm x 60 cm (23.62 in x 23.62 in) standard piece consists of two wedge shaped pyramids.

Non-hygroscopic & Fire Resistant

DuraSorb is intrinsically non-hygroscopic due to its closed cell design. Furthermore, DuraSorb is engineered to have outstanding fire resistancy. The material is treated additionally with environmentally friendly fire retardants beyond what is normally required for construction grade foams. DuraSorb material has been tested to meet the requirements of UL94 HBF and DIN 4102 B2.

Specifications Select a tab below for more information

Frequency Range:  30 MHz to 40 GHz
Reflectivity:  -12 dB from 30 MHz to 80 MHz
                      -15 dB from 80 MHz to 300 MHz
                      -20 dB above 300 MHz
Power Handling 200 V/m CW
Standards Compliant MIL-STD 461, CISPR 25
Standards Pre-Compliant ANSI C63.4, CISPR 16
Height145.6 cm (18.0 in)
Width:  60.0 cm (23.6 in)
Depth:  60.0 cm (23.6 in)

1Height Includes Ferrite Tile Base
  • DuraSorb Polystyrene Absorber
  • PS-1001 Polystyrene Universal Mounting Base
  • Ferrite Substrate
  • Polystyrene White Caps

View BIM Models of our Product Options Below:



Key Features

  • 30 MHz to ­40 GHz Frequency Range 
  • For MIL-STD-461, CISPR 25 and Smaller ANSI C63.4, CISPR 16 Rooms
  • Power Handling of 200 V/m CW 
  • Durable Construction, Precision Installation Design
  • Non-hygroscopic, Fire Resistant

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Date Last Updated: Thursday, November 19, 2020
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