Name: LAIRD BSR
Brand: DDP Specialty Electronic Materials US 9, LLC
SKU: LAIRD BSR

Main features

6-18 GHz cavity-resonance control
Flexible, electrically non-conductive silicone construction
0.47% TML / 0.28% CVCM outgassing values

Product Description

Laird Eccosorb™ BSR is a thin, flexible, magnetically loaded silicone microwave absorber designed for cavity-resonance control from 6 to 18 GHz. The electrically non-conductive material combines high magnetic loss with a -40 to 170°C service-temperature range and documented low-outgassing data. It can be installed directly in front of metallic surfaces, cut to shape, and conformed to curved geometries. BSR is available in BSR-1 and BSR-2 versions, with multiple thicknesses and optional pressure-sensitive adhesive configurations.

Key features

6-18 GHz cavity-resonance absorber: Current Laird product positioning covers 6 to 18 GHz for cavity-resonance control.
Flexible silicone construction: The thin elastomeric sheet can be cut to shape and conformed to compound curves.
High-temperature service: Documented service-temperature range is -40 to 170°C.
Electrically non-conductive: Current product data lists volume resistivity of 2 x 108 ohm-cm.
Documented outgassing data: 0.47% TML and 0.28% CVCM are reported per ASTM E595-07.
Attachment flexibility: Available with or without a pressure-sensitive adhesive option.

Applications / Suitable for

Cavity-resonance damping, surface-current control, coupling reduction, and reflection damping in microwave assemblies.
Microwave terminations, loads, attenuators, waveguides, and transmission systems.
Aerospace, defense, space, power-amplifier, oscillator, and down/up-converter applications.

TDS, SDS & Technical Documents

RFP-DS-BSR MFS 22092021

English (Technical Data Sheet (TDS))

Technical Specifications

Thermal Properties

Operating Temperature

-40 to 170 °C

UL 94 Rating

Mechanical Properties

Elongation

50 %

General Properties

Density (g)

4.2 g/cm3

Electrical Properties

Dielectric Strength

0.39 kV/mm

Volume Resistivity

2 x 10^9 Ohms⋅cm

Chemical Properties

Water Absorption

<0.1% %

Additional Information

Cavity resonance absorber

Laird Eccosorb™ BSR

Laird Eccosorb BSR is a flexible silicone elastomer absorber for cavity-resonance and EMI control in microwave assemblies. Current Laird product data positions BSR for 6-18 GHz operation with 40 dB/cm attenuation at 10 GHz, an electrically non-conductive construction, and a -40 to 170°C operating-temperature range.

6-18 GHz 40 dB/cm at 10 GHz -40 to 170°C Silicone elastomer Electrically non-conductive UL94 V-0

Laird Eccosorb BSR high-loss silicone elastomer microwave absorber sheet.

Material and formats

Material and configuration

Construction

Flexible silicone sheet

Black, magnetically loaded elastomeric absorber that can conform to compound curves.

Version mapping

BSR-1 / BSR-2

BSR-1 corresponds to MFS-124 and BSR-2 corresponds to MFS-117.

Listed thickness range

0.25-12.70 mm

Current Laird product data lists minimum and maximum thickness values across available BSR configurations.

Attachment options

PSA available

Configurations are available with or without pressure-sensitive adhesive, with on-drawing options also listed by Laird.

Installation

Placement and conversion guidance

Eccosorb BSR is designed to function directly in front of a metallic surface. Its flexible sheet form can be cut and fitted to contoured geometry; bonding method should be selected with the intended service temperature in mind.

Placement: Install the absorber directly in front of a metallic surface for the intended absorber function.

Cutting and forming: The sheet can be cut with a sharp knife and template and can conform to contoured surfaces.

High-temperature bonding: For service temperatures above 121°C (250°F), Laird instructs bonding to most substrates with an RTV silicone-based adhesive used with a suitable primer.

Illustrate BSR installed directly in front of a metallic surface and cut to fit the target geometry.

Technical data

Performance properties

Values are typical design guidance unless noted. Application performance can vary with geometry, thickness, placement, and operating conditions, so material should be evaluated in the intended assembly.

Property	Value	Unit	Method / condition
Product frequency range	6-18	GHz	Current Laird product positioning
Attenuation	40	dB/cm	At 10 GHz
Service temperature	-40 to 170	°C	Documented service / operating range
Volume resistivity	2 x 108	ohm-cm	Current Laird product data
Hardness	>70	Shore A	Typical
Tensile strength	5.0	MPa	Typical
Density	4.2	g/cc	Typical
Elongation	50	%	Typical
Thermal expansion	63 x 10-6	per °C	Typical
Thermal conductivity	0.865	W/mK	Typical
Water absorption	<0.1	%	24-hour value
Outgassing	0.47 / 0.28	% TML / % CVCM	ASTM E595-07
Flammability rating	UL94 V-0	-	Current Laird product data
Compliance	RoHS / REACH	-	Current Laird product data: compliant / yes

Use contexts

Applications

BSR is used where a flexible, non-conductive microwave absorber can be placed near metal to damp cavity resonance, surface currents, coupling, and reflections within its documented frequency range.

Microwave cavities and enclosed RF assemblies

Eccosorb BSR is engineered to reduce or eliminate surface currents, cavity resonance, and coupling while damping reflections. Its magnetic-loss behavior and 6-18 GHz positioning make it relevant for evaluating unwanted resonant energy in metallic microwave housings and cavities.

Terminations, loads, attenuators, and waveguides

Laird identifies microwave terminations, loads, attenuators, waveguides, and transmission systems as supported use contexts. The cuttable, conformable sheet format allows the absorber to be shaped for the available internal geometry and positioned near metallic surfaces.

Aerospace, defense, and space RF electronics

Laird recommends BSR/MFS for high-reliability aerospace, military, and space applications. Its documented outgassing values, electrically non-conductive silicone construction, and -40 to 170°C service range provide concrete screening criteria for RF hardware in demanding environments.

Product resource

Product resources

Laird Eccosorb Microwave Absorber Commercial Brochure

This supplier brochure provides a broader Eccosorb absorber selection overview, including frequency-range positioning, cavity-resonance product families, manufacturing and testing capabilities, and reference use cases. It positions Eccosorb BSR as a 6-18 GHz high-loss flexible absorber sheet.

View full screen

Next steps

Evaluate Eccosorb BSR for your RF assembly

Krayden can help review frequency range, cavity geometry, thickness and format, attachment method, and service temperature when evaluating Eccosorb BSR for cavity-resonance and EMI-control applications. Contact us to discuss available configurations, sampling, conversion needs, or technical questions for your specific assembly.

Contact Krayden