Loading... Please wait...

Our Newsletter

(8) C-RAM RGD-S 124/PPGA .125x12''x12'' "Pressure Sensitive Adhesive"

  • Image 1
C-RAM RGD-S 124/PPGA .125x12''x12'' "Pressure Sensitive Adhesive"

Product Description

C-RAM RGD-S is a filled silicone rubber sheet material with a high magnetic loss. It is available in three grades: -117, -124, and -192. The -192 grade has the highest loading and highest loss.

C-RAM RGD-S is used for terminations, loads, and attenuators in waveguides, coaxial lines, and microstrip circuits. It can also be used for lowering the Q of cavities and eliminating unwanted resonances.

C-RAM RGD-S is cut readily with a sharp knife, and can be sawed, die cut, waterjet cut, or otherwise machined to complex shapes. Since it is ferromagnetic, it is easily held in place during machining with magnetic chucks. It is flexible and can be bonded to contoured surfaces.

Because it is flexible, C-RAM RGD-S can withstand temperature cycling when bonded to metals. The material has good thermal conductivity and can be used to dissipate heat, including that generated by its own magnetic loss mechanism.

C-RAM RGD-S 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 RGD-S to a substrate is with a silicone RTV adhesive. For best results, the substrate should be scuffed with sandpaper, wiped with alcohol to remove dust and grease, and a silicone primer applied, such as C-PRIME 215.

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


Color: Grey

Flammability: non-flammable    

Specific Gravity: 4.0

Thermal Expansion per ºC: 6 x 10-5

Thermal Conductivity: .0021 cal-cm/sec-cm2-ºC

                                   6.0 BTU-in/hr-ft2-oF

Service Temperature: -55 to +200 oC

                                   (-65 to +400 oF)

Hardness, Shore A: 75

Water Absorption, 24 hrs: <0.1%

Volume Resistivity, ohm-cm: >1010

Dielectric Strength, kV/mm: >400 (>100 V/mil)  

Relative Impedance (Z/Zo):  0.3 for -117

                                           0.4 for -124

                                           0.6 for -192

Attenuation, dB/cm:





1.5 GHz




3.0 GHz




8.6 GHz




10.0 GHz




(Note: attenuation is a measure of the absorption of RF energy within the material, and is not the same as insertion loss, which includes reflected energy at the air-material interface)


Standard product sizes for both grades are flat sheets 12 x 12 in (305 x 305 mm), available in several standard thicknesses including:

0.030 in (0.76 mm)

0.040 in (1.02 mm)

0.060 in (1.52 mm)

0.125 in (3.17 mm)

0.250 in (6.35 mm)

Specify the part as: C-RAM RGD-S-117 (or -124, -192) XXX x12x12   (RGD-S 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 RGD-S-117 (or -124, -192)/PPGA XXX x12x12 (RGD-S 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-10-000-00106-F

Find Similar Products by Category

Write your own product review

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!

You Recently Viewed...