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(2) C-RAM GDSS/PPGA .030" x 12" x 12" "Pressure Sensitive Adhesive"

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C-RAM GDSS/PPGA .030" x 12" x 12" "Pressure Sensitive Adhesive"

Product Description

C-RAM GDSS has a high magnetic loss tangent from about 4 GHz to 35 GHz. It will perform well in the 900 MHz cellular frequencies. Generally, thicker grades are required to attenuate lower frequencies to the same degree as a thinner grade at higher frequency.
C-RAM GDSS is a thin, magnetically filled, silicone rubber sheet stock which has high loss at microwave frequencies. It is applied to metal surfaces to attenuate RF surface currents. It can be used to modify antenna patterns, lower the Q of a cavity, act as a transmission line attenuator, and modify the radar cross section of targets.

C-RAM GDSS is a thin elastomer sheet, so it will conform to curvatures of the substrate. It is not electrically conductive, and has high dielectric strength. It is a soft material and is readily die-cut or cut with a razor. Since it is made of silicone, it will withstand wide temperature ranges, and survive outdoor exposure.


Color: Grey
Flammability: non-flammable   
Thickness and weight (3 grades):
    0.75 mm (.030”) ---  2.3 kg/m2 (0.47 lb/ft2)
    1.52 mm (.060”) ---  4.6 kg/m2 (0.95 lb/ft2)
    3.18 mm (.125”) ---  9.6 kg/m2 (1.98 lb/ft2)
Service temperature:   -50 to +200oC
                 (-65 to +400oF)
Hardness, Shore A: 80
Thermal Conductivity: 0.002 cal-cm/sec-cm2-oC
Volume resistivity: >1011 ohm-cm
Dielectric strength: 10 kv/mm (250 v/mil)

C-RAM GDSS can be supplied with a pressure sensitive adhesive (PPGA). PPGA will provide an excellent bond in many applications, particularly when one is bonding smaller pieces. Simply peel off the backing, press the part onto a primed surface, and apply heat with a heat gun for 1-2 minutes to effect a good bond.
An alternative method of applying C-RAM GDSS to a substrate is with a silicone RTV adhesive.  For best results, the metal should be scuffed with sandpaper, wiped with alcohol to remove dust and grease, and have a silicone primer applied, such as C-PRIME 215.

The silicone adhesive, such as C-BOND 255 or equivalent, is brushed or rolled onto one of the surfaces, and the sheet is then applied to the metal. An overnight cure is generally required, and a modest temperature cycle, such as a few hours at 150°F, helps the bond.


C-RAM GDSS is available in three standard thicknesses-- .030”, .060”, and .125”.  

Standard dimensions for all thicknesses are flat sheets 300 x 300 mm (12 x 12 in), in the nominal thickness for the particular grade. Specify the part as:
C-RAM GDSS/NA XXX x12x12   (GDSS silicone absorber with no adhesive), where xxx is the nominal thickness in inches (030, 060,125), and include the dimensions.

We can supply other dimensions, and can die-cut, water jet or water jet cut parts to your drawings.

C-RAM GDSS can also be supplied with a peel-and-stick pressure sensitive adhesive backing.  Specify the part as: C-RAM GDSS/PPGA XXX x12x12 (GDSS silicone absorber with PSA Adhesive backing).

The information in this technical bulletin, although believed to be accurate, is not to be taken as a warranty for which Cuming Microwave assumes legal responsibility, nor as permission or recommendation to practice any patented invention without license.   It is offered for verification by the customer, who must make the final judgment of suitability for any application.

Document Control No. N-06-000-00033-G

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