High-Loss, Two-Part Castable RTV Silicone Absorber
ECCOSORB
®
CRS
•
•
•
Material Characteristics
•
•
•
•
•
•
Castable RTV silicone rubber with high-loss in the
microwave frequency range. Dark gray in color.
When fully cured, ECCOSORB
®
CRS will duplicate the
electrical properties of its counterpart in the
ECCOSORB
®
MFS series. For example, ECCOSORB
®
CRS-117 is electrically equivalent to ECCOSORB
®
MFS-117.
Being a true elastomer, ECCOSORB
®
CRS when cured,
has a number of distinct advantages over rigid
materials of the ECCOSORB
®
MF type.
For electrical and physical properties of the
ECCOSORB
®
CRS series, please see the Technical
Bulletin on ECCOSORB
®
MF.
Frequency range from 1 - 18 GHz
Low out-gassing properties
Instructions for Use
for actual mix ratios by weight
Part A is supplied as a high viscosity paste. In all
cases a small amount of Part B is added.
See table below
To insure void-free castings, the entrapped air should
be removed by vacuum de-airing
The mixture converts to flexible, high temperature
silicone rubber at room over night or elevated
temperatures of 175 °F for 3 hours. Where use
temperature is anticipated above 250 °F (121°C), a
post cure is recommended. Gradually raise cast parts
to the use temperature over an 8 hour or longer
period
If cast around inserts, they place negligible curing
pressures on them
The ECCOSORB
®
CRS will adhere to themselves but
will release from most other surfaces. Therefore,
metal or epoxy molds are suitable for cast shapes. If
adhesion is required, a primer must first be used
Members of the ECCOSORB
®
CRS series can be
bonded to other materials with ECCOBOND
®
TP-50. A
wipe-on coat of ECCOBOND
®
TP-50 will give cast or
molded pieces extra environmental protection
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•
Applications
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•
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ECCOSORB
®
CRS can be used to cast cones, wedges,
and pyramids for terminations and loads
It can also be used to fill cavities or be painted on
surfaces to suppress the flow of currents. Therefore,
ECCOSORB
®
CRS finds use in antennas and
transmission lines. It has also been poured around the
base of microwave tubes to prevent undesired energy
flow
ECCOSORB
®
CRS can also be poured in place to form
microwave gaskets
When bonded to surfaces, ECCOSORB
®
CRS will
withstand temperature cycling (even to cryogenic
temperatures). It can be deformed and shaped to
contoured surfaces and is not subject to damage from
impact or shock
•
Typical Properties
CRS-117
Density, g/cc
Max. Service Temperature, °F (°C)
Thermal Expansion, °F (°C)
Thermal Conductivity,
(cal)(cm)/(sec)(cm
2
)(°C)
(BTU)(in)/(hr)(ft
2
)(°F)
Hardness, Shore A
4.16
320 (160)
35 x 10
-6
(63 x 10
-6
)
0.0021
6.0
75
<0.1
>10
(>4)
>10
10
0.3
100:1.18
CRS-124
4.55
320 (160)
33 x 10
-6
(59 x 10
-6
)
0.0024
7.0
75
<0.1
>10
(>4)
>10
10
0.4
100:1
Availability
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•
•
ECCOSORB CRS is supplied as a two component
system consisting of a Component A and Component B
in 2 pound (quart) and 8 pound (gallon) kits. It does
not ship as a dangerous good.
Both CRS-117 and CRS-124 are available in premixed
and frozen 5cc, 10cc, and 30cc syringes. No Mixing is
needed.
Note: Premixed and frozen packaging
requires storage at –40°F (-40°C) and shelf life is 3
months. Minimum buy is 100 syringes for any size.
Shelf life is approximately 6 months when stored
unmixed in a well sealed container. This material can
be stored frozen to increase shelf life.
®
Water Absorption, % 24 hours
Dielectric Strength, volts/mil
(Kv/cm)
Volume Resistivity, ohm-cm
Relative Impedance, Z/Zo
Mix Ratio by weight, A:B
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 material 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.
Revision: 10/8/2008
www.eccosorb.com
A25
Typical Attenuation
GHz
CRS-117
dB/cm
dB/in
CRS-124
dB/cm
dB/in
10
-7
0
0
0
0
10
-6
0
0
0
0
10
-5
0
0
0
0
10
-4
0
0
0
0
10
-3
0
0
0
0
10
-2
0.03
0.08
0.03
0.08
10
-1
0.27
0.69
0.48
1.2
1.0
2.8
7.1
6.5
16.51
3.0
11
28
20
50
8.6
46
117
63
160
10.0
56
142
67
170
18.0
119
302
149
378
*Note: Attenuation is a theoretical property calculated from the Complex Permittivity and Complex Permeability of a lossy material and is strictly a
means of comparing one absorbing material to another. The attenuation properties are not an indication of how the material will perform inside a
microwave device. For further electrical and physical properties of the ECCOSORB
®
CRS series, please see the Typical Electrical Properties Table
on the ECCOSORB
®
MFS technical bulletin
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 material 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.
Revision: 10/8/2008
www.eccosorb.com
A25
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