Revision: 5/11/07 www.eccosorb.com A15
EMERSON & CUMING MICROWAVE PRODUCTS, INC., 28 York Avenue, Randolph, MA 02368 / Telephone (781) 961-9600. Use of Information and Material: Values shown are based on testing of laboratory test specimens and represent data that
falls within normal range of the material. These values are not intended for use in establishing maximum, minimum or ranges of values for specification purposes. Any determination of the suitability of the materia l for any purpose
contemplated by the user and the manner of such use is the responsibility of the user. The user should determine that the material meets the needs of the user's product and use. We hope that the information given here will be helpful. It is
based on data and knowledge considered to be true and accurate and is offered for the user's consideration, investigation and verification but we do not warrant the results to be obtained. Please read all statements, recommendations or
suggestions in conjunction with our conditions of sale INCLUDING THOSE LIMITING WARRANTIES AND REMEDIES, which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or
suggestions nor do we intend them as a recommendation for any use, which would infringe any patent or copyright. Emerson & Cuming Microwave Products Inc.
ECCOSORB
ECCOSORB®
® LS
LS
Lossy, Flexible, Foam Microwave Absorber
Material Characteristics
•ECCOSORB® LS is the most widely known, used, and
recommended urethane foam sheet product.
•High loss, low density, and very flexible
•ECCOSORB® LS obtains it’s microwave properties via a
carbon loading system and is therefore, electrically
conductive
•Very low cost solution for many applications over the
thinner, more expensive rubber absorbers
•Not weatherproof but can be supplied with a weather
resistant CERSEAL coating, see Availability below
•If UL-94-HF-1 fire retardancy is a requirement, see
ECCOSORB® QR-13AF
•Can be easily cut with a knife, scissors, or die
Applications
•ECCOSORB® LS is used to lower cavity Q’s in RF
amplifiers, oscillators, cabinets containing microwave
devices, computer housings, LNB’s, and isolation of
antennas by insertion loss
•ECCOSORB® LS is also used to reduce surface currents
on radiating elements and outer ground-plane type
surfaces.
•Reflectivity of an object (metal or otherwise) can be
reduced somewhat by applying one or more layers of
ECCOSORB® LS to its surface
Availability
•Standard sheets are 24” x 24” (61 cm x 61 cm)
•Standard thicknesses are 1/8” (0.3cm), 1/4” (0.6cm),
3/8” (0.9cm), 1/2” (1.3cm) & 3/4” (1.8cm)
•Upon special request, ECCOSORB® LS can be supplied
with an anti-dust coating UMSEAL (UM), to prevent
carbon fallout
•ECCOSORB® LS can be supplied with a CERSEAL
coating to prevent moisture uptake in high humidity to
moderately wet environments upon special request
•For applications requiring ECCOSORB® LS to be in
close contact with electrical components, a PEF film is
available on request to prevent electrical shorts
•ECCOSORB® LS can also be supplied with a Pressure
Sensitive Adhesive (PSA). Product designation
denoting ECCOSORB® LS with a PSA is ECCOSORB®
LS-XX/SS3
•ECCOSORB® LS is available in other sizes and
customer specified configurations upon request
Instructions for Use
•Being electrically conductive ECCOSORB® LS could
cause a short in some microwave circuits, but only if
the material comes in contact with components, see
PEF film under Availabilit y
•For high loss applications, ECCOSORB® LS-28 and
LS-30 are recommended
•ECCOSORB® LS can be securely bonded to itself or to
other materials such as metal, wood, and common
plastic composites. The recommended adhesive is
ECCOSTOCK® 13-111-NF if not ordered from the
factory with a PSA.
Frequency Range 1 to 26 GHz
Service Temperature, °F (°C) -94 to 200
(-70 to 93)
Color Black
ε’ 3 - 20
µ’ 1.0
tan δm 0.0
Fire Retardancy UL 94 HBF
Typical Properties
Attenuation (dB/cm)
3 GHz 10 GHz 3 GHz 10 GHz
LS-14 1.0 1.7 0.83 0.89
LS-16 1.5 2.3 0.78 0.87
LS-18 3.2 4.7 0.69 0.82
LS-20 4.2 7.0 0.61 0.78
LS-22 7.4 14.9 0.55 0.74
LS-24 11 24 0.25 0.44
LS-26 16 34 0.18 0.31
LS-28 20 40 0.16 0.27
LS-30 24 46 0.13 0.22
Relative Impedance
(|Z|/Z0)
Revision: 5/11/07 www.eccosorb.com A15
EMERSON & CUMING MICROWAVE PRODUCTS, INC., 28 York Avenue, Randolph, MA 02368 / Telephone (781) 961-9600. Use of Information and Material: Values shown are based on testing of laboratory test specimens and represent data that
falls within normal range of the material. These values are not intended for use in establishing maximum, minimum or ranges of values for specification purposes. Any determination of the suitability of the materia l for any purpose
contemplated by the user and the manner of such use is the responsibility of the user. The user should determine that the material meets the needs of the user's product and use. We hope that the information given here will be helpful. It is
based on data and knowledge considered to be true and accurate and is offered for the user's consideration, investigation and verification but we do not warrant the results to be obtained. Please read all statements, recommendations or
suggestions in conjunction with our conditions of sale INCLUDING THOSE LIMITING WARRANTIES AND REMEDIES, which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or
suggestions nor do we intend them as a recommendation for any use, which would infringe any patent or copyright. Emerson & Cuming Microwave Products Inc.
Approximate Insertion Loss at 3 GHz and 45 Degrees
0
10
20
30
40
50
60
0.125 0.25 0.375 0.5 0.75
Thickness (in)
dB Insertion Loss
LS-30
LS-28
LS-26
LS-24
LS-22
LS-20
LS-18
LS-16
LS-14
