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BISCO® RS-700 Series : Industrial Grade Sponge

BISCO® RS-700 Series : Industrial Grade Sponge (closed cell)

BISCO® RS-700 Series Industrial Grade Sponge silicone foam produced by Rogers Corporation is a high-performance closed-cell compliment to the other BISCO cellular silicones. It offers extreme elongation, durability, temperature resistance, and sealing characteristics in three product varieties, RS-720(soft), RS-750(medium), and RS-770 (firm).

Insul-Fab carries RS-700 Series in stock and fabricates the full line of Rogers Corporation BISCO® Silicone Products for your end use applications.  (link underlined text to the Insul-Fab Bisco Silicone page)


  • Consistent performance in extreme service temperatures
  • More resilient to compression set than other closed-cell materials
  • Reliable sealing at low compression levels
  • Flame retardant, meeting FMVSS 302
  • Certified to UL 50, UL 50E and UL 508 requirements
  • Resistance to UV light, ozone, and chemicals
  • RoHS and REACH compliant
  • Fabricates by die cutting and water jet
  • May be laminated with adhesive for attachment


BISCO® RS-700 Series Closed-Cell Silicone Sponge is an Industrial Grade performance silicone foam that offers extreme strength and elongation, with reliable sealing at low compression levels.  The enhanced sealing and compression set resistance in extreme environments make this foam ideal for outdoor transportation, industrial, and electronics gasket applications where environmental seals are desired for the life of the product. 

BISCO silicones’ unique properties allow for consistent compression force, limited compression set, and long-term performance reliability even at extreme low and high temperatures. 

BISCO® RS-700 Series Sponge Properties
Property Method Typical Value
Grade - RS-720 RS-750 RS-770
Firmness - Soft Medium Firm
Color(s) - Fog Gray Steel Gray Charcoal
Density, lb/ft3 (kg/m3) ASTM D1056 17.5 (280) 24 (384) 29 (465)
Compression Force Deflection, psi @ (25%) ASTM D1056 5-12 6-14 12-20
Compression Set,max % ASTM D1056
Test D @ 100oC
(212oF), 22hrs
<15 <20 <15
Elongation, % ASTM D412 175 135 130
Flame Resistance FMVSS 302 Pass
Service Temperature, Continuous Rec. High: 401oF (205oC)
Low: -67oF (-55oC)
Thickness Range, in (mm) 0.094-0.500
Material Width, in 36
Format Availability Fabricated Parts, Foam Tapes, Rolls, Sheets
Thermoformable No
RoHS Compliant Yes
Halogen Free Yes

Insul-Fab is proud to be designated a Major Converter of Rogers BISCO® and we commonly have many of their products in stock for distribution and fabrication.  Samples and part prototypes are readily available along with engineering support to choose the right material for your application.

Standard Product Availability

Within the most common BISCO product lines there are many thickness and color combinations available as standard, and more that are non-standard but available with minimum orders. 

Contact us to find out if the BISCO SKU you are looking for is available in stock.  Samples and non-tooled application prototypes available on request.

In applications where the desired thickness is not standard, Insul-Fab can laminate two layers of material together with adhesive, or we can utilize another substrate, such as Formex or Lexan plastic film, to fill the desired gap and provide part rigidity while maintaining a stack-up of UL rated products for flammability requirements. 

Adhesive Backing and Lamination

Many applications for Rogers BISCO silicones require a pressure sensitive adhesive (PSA) with release liner on one or both sides for attachment in the end use.  Some BISCO products are available from the factory with pre-applied adhesive (special part number for designation). 

For more diverse adhesive selection and smaller lot sizes, Insul-Fab laminates silicone materials with PSA using a sophisticated in-house priming and lamination process to ensure a superior bond.  While many products bond well to primed BISCO, we recommend the following laminating adhesives.

Adhesive Construction
3M 467MP and 3M 468MP .002” and .005” unsupported acrylic (HP)
3M 9832 and 3M 9832HL .005” double-coated acrylic (HP)
Concote CC593 .004” double-coated acrylic (GP)

Unsupported acrylic adhesives offer an excellent bond and ability to conform to surface variations.  Double-coated or supported acrylics provide dimensional stability to larger parts or thin cross sections, to prevent stretching during end use application.


  • Environmental seals and gaskets
  • Foam tapes for long lengths and door seals
  • Vibration isolation and energy absorption
  • Gaskets for extreme temperatures
  • Compression and rebound pads
  • Thermal insulation


Data Sheets

Brochures & Literature


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The Rogers logo and BISCO® logos are trademarks of Rogers Corporation or one of its subsidiaries.  © 2019 Rogers Corporation. The technical data provided on this page is intended to assist you in material selection.  It is not intended to and does not create any warranties, express or implied.  The user should determine the suitability of the material for each application.

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