Laird Technologies

Microwave Absorbing Foam

RFLS - Single Layer "Lossy" Foam Absorbers

RFLS is a series of single layer “lossy” sheets produced by dipping lightweight open-celled urethane foam into a resistive solution.  The end product is a uniform, lightweight, loaded sheet material with a specified insertion loss at a given frequency. 

RFLS offers the lowest cost in microwave absorber products.  Thickness of the sheets range from 0.125” to 1.5” (3.2 mm to 38.1 mm) and are generally 24” x 24” (609.6 mm x 609.6 mm).  Custom sizes and components can be fabricated. 

The insertion loss of the product is measured in an insertion tunnel over the 2 to 18 GHz frequency range.  Specifications are generally given at 3 or 10 GHz.  The material can be die-cut into components and supplied with a pressure sensitive adhesive for ease of application.

Fire retardant versions to UL94 HF1 are available.

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