Flexible, Low Loss, Closed Cell Polyethylene Foam
ECCOSTOCK
®
PP
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Material Characteristics
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Closed cell, cross-linked polyethylene foam with low
loss, low dielectric, and low density
Due to the low dielectric constant, the materials are
essentially transparent to electromagnetic energy
Dielectric constant does not change with frequency and
change with temperature is negligible
Dissipation factor is below 0.0003 at frequencies from
60 Hz to 10 GHz
Excellent thermal insulation
ECCOSTOCK
®
PP is lightweight and will return to its
normal thickness after being compressed
Can be heat sealed to form blocks of material or to
make contoured pieces that can be draped over
complex objects
Color is white, surface is smooth
Environmental Properties
ECCOSTOCK
®
PP is tough and weather resistant
Low water absorption and vapor transmission
Has been used in ocean applications
Chemical Resistance data may be available on special
request
Availability
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Applications
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ECCOSTOCK
®
PP can be used as radomes, blankets,
and coverings where radar transparency is desired. It
can also be used in a variety of electrical and
microwave applications
With its low density and being closed cell, it finds uses
in ocean buoyancy applications
It has been used as a spacer in antenna applications
ECCOSTOCK
®
PP is available in two densities: 2 lb/ft
3
and 4 lb/ft
3
. It is designated as ECCOSTOCK
®
PP-2
and ECCOSTOCK
®
PP-4
Standard sheets are available in 48” x 60” sheets with
thickness of 1/8” and 1/4” (0.32cm and 0.64cm)
Other sheet sizes are available on special order
For most applications ECCOSTOCK
®
PP can be
supplied with a Pressure Sensitive Adhesive (PSA).
Product designation denoting PSA add-on is
ECCOSTOCK
®
PP-X/SS10. Please note the addition of
the SS10 PSA reduces the available sheet size to 24”
x 24”
Typical Properties
PP-2
Service Temperature, °F (°C)
Compression Strength, psi @ 25%, (psi @ 50%)
Compression Set (% of original thickness)
Hardness, Shore A
Loss Tangent
Dielectric Constant
Density, lbs/ft
3
Tensile Strength, kg/cm
2
Elongation %
Thermal Conductivity, (cal)(cm)/(sec)(cm
2
)(°C)
Water Absorption, lb/ft
2
of cut surface
Available Thickness
-112 to 185
(-80.0 to 85.0)
5 (14)
28
7
0.0001
1.03
1.8 - 2.2
2.5
220
0.000096
0.04
1/8” & 1/4”
PP-4
-112 to 185
(-80.0 to 85.0)
9 (19)
16
15
0.0001
1.06
3.6 - 4.4
5.5
290
0.00010
0.04
1/16” & 1/8” & 1/4”
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: 12/14/11
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