Eccosorb® BSR-U


Eccosorb BSR-U is a thin, flexible, high-loss, electrically non-conductive urethane absorber. It is designed for the frequency range from 6 GHz to mm wave. It is available in a wide range of thicknesses to suit an extremely broad range of applications including very small microwave cavities typically seen in higher frequencies. The main advantage of the polyurethane version is its ease of bonding to various substrates.

Specific product Characteristics
  • High mechanical strength
  • Excellent abrasion resistance
  • Silicone free
  • Commercial Telecom
  • Automotive and Industrial Electronics
Typical application
  • Eccosorb BSR-U is effective in reducing surface currents, cavity resonances, coupling and to some extent specular reflections due to the absorber’s high permittivity and permeability as well as high loss values.
  • It will significantly improve the operation of microwave devices by lowering the Q of cavities.
  • Eccosorb BSR-U will reduce the reflections from metal structures through the absorption of surface currents.
  • Applications include power amplifiers, oscillators and down/up converters.
  • Standard sheets are 305 mm x 305 mm (12”x12”).
  • Standard thicknesses are 0.25mm (.010”), 0.50mm (.020”), 1.0mm (.040”), 1.5mm (.060”) and 2.54mm (.100”).
  • It can be supplied with a pressure sensitive adhesive designated as Eccosorb BSR-U-xx-SA, where the –SA suffix stands for Self-Adhesive .
  • The products are also available in other sizes, thicknesses and customer specified configurations upon request. This includes die cut and kiss cut parts to reduce installation labor by allowing quick assembly.
Instructions for use
  • Eccosorb BSR-U is designed to function directly in front of a metallic surface. If this is not the case, a metallic foil should first be bonded to the object.
  • To obtain a strong bond of the absorbert othe object, the metallic surface should be first thoroughly cleaned with a degreasing solvent.
  • Epoxy and acrylic adhesives are recommended or use the self-adhesive version.
  • Eccosorb BSR-U can be readily cut with as harp knife and template. It is a very flexible material and will conform to contoured surfaces.
Product properties
Frequency Range≥6Ghz
Service Temperature °C (°F)-40 to 120 (-40 to 248)
Hardness Shore A80
Elongation %50
Tensile Strength MPa3.5



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Euro Technologies offers a wide selection of products. Inside the general catalogue are described, each range, including its features and benefits, specifications, the available variants and possible applications.