Fluorosilicone / Fluorosilicone Rubber

Fluorosilicone Assortment

Fluorosilicone rubber is a modified version of silicone rubber that has been fluorinated to “cap off” the polymer chains to improve its chemical resistance. Fluorosilicone rubber is widely used in aerospace applications where fuels, coolants and oils may be present. These same fluids would cause standard silicone rubber and most other products to deteriorate. Fluorosilicone products also have very good low temperature and high temperature properties and are inherently UV and ozone resistant.

Stockwell Elastomerics offers a full range of fluorosilicone products including solid fluorosilicone certified to Mil-R-25988 and AMS specifications ranging from 40 to 70 durometer Shore “A” compounds that are tested and certified to meet Mil-R-25988 and AMS specifications. General purpose grades of fluorosilicone are also available.

Visit the Fluorosilicone Data Sheets page for detailed technical information on each available fluorosilicone product.

Fluorosilicone Sheets

Stockwell Elastomerics molds 12″ x 12″ fluorosilicone rubber sheets in a range of standard and custom thicknesses from .062″ to .500″ thick. Hardness range includes 40 – 70 durometer Shore “A”. In addition to manufacturing the fluorosilicone sheets, Stockwell Elastomerics offers pressure sensitive adhesive lamination and custom cutting for fluorosilicone gaskets and fluorosilicone pads. Molded sheets are lot traced and available with full certifications.

Fluorosilicone Rolls, Continuous

Continuous rolls of specification grade fluorosilicone rubber are available in standard and custom thicknesses. Certified fluorosilicone rubber with full test reports are available in 12″ wide rolls from .032″ to .100″ thick. General purpose fluorosilicone is available up to 36″ wide rolls. 3M pressure sensitive adhesive lamination and custom part cutting by die cutting, knife cutting or water jet cutting processes are also available.

Fluorosilicone Sponge, Closed CellFluorosilicone Gasket

In addition to solid fluorosilicone rubber, Stockwell Elastomerics maintains inventory of R10490 closed cell fluorosilicone sponge. Fluorosilicone sponge is made with a gum base, similar to solid fluorosilicone, but is expanded to introduce the cell structure. This expanded fluorosilicone sponge rubber allows for deflection and sealing with much lower force than solid fluorosilicone rubber.

Due to the limitation of the expanding process, R10490 is produced to a maximum thickness of 0.125″. However, Stockwell Elastomerics offers bonded laminations up to 0.50″. These laminations are strong and exhibit similar chemical and temperatures properties as the fluorosilicone sponge rubber.

COHRlastic® R10490 is now part of the Saint-Gobain’s NORSEAL® product line. NORSEAL® R10490 fluorosilicone sponge is the same product as COHRlastic R10490, just with a new family name.

R10490 Specifications

  • Capable of meeting AMS 3323, Class 2 medium density (tested in 2006)
  • Capable of meeting Mil-R-6130 Type 2, Grades A, B and C (excluding paragraph 4.5.7 flame resistance)
  • Capable of meeting ASTM D6576 Type 2 Grades A, B and C (excluding paragraph 15 flame resistance)


Fluorosilicone MoldingFluorosilicone Parts

Stockwell Elastomerics is an ITAR registered, USA-based molder of fluorosilicone and electrically conductive fluorosilicone components. Compression molds are domestically manufactured and custom fluorosilicone components are manufactured in Stockwell Elastomerics’ location in Philadelphia Pennsylvania. Molded fluorosilicone parts are manufactured in compression molds and may be manually or cryogenically de-flashed.

Fluorosilicone EMI Gasket Materials

EMI gaskets often require a fluorosilicone base to address chemical exposures. Stockwell Elastomerics offers conductive fluorosilicone sheets and molded, conductive fluorosilicone components with silver plated aluminum particle fill or nickel coated graphite particle fill. Both offer very good EMI attenuation with the added chemical resistance of fluorosilicone.

Conductive Fluorosilicone Rubber

  • SNEF-50 – 50 durometer fluorosilicone with Nickel plated graphite particle
  • SCF-444-P – 45 durometer fluorosilicone with passivated silver plated aluminum particle fill
  • SCF-447 – 70 durometer fluorosilicone with silver plated aluminum particle fill (MIL-DTL-83528 Type D)

Electrically conductive fluorosilicone rubber with silver plated aluminum or nickel coated graphite are available in cured sheets from .020″ to .125″ thick and custom molded gaskets.

Specifications Met by Fluorosilicone RubberFluorosilicone Gaskets

Mil-R-25988, Mil-R-25988B and AMS-R-25988 are frequently used to specify fluorosilicone rubber gaskets and materials. AMS 3325 through AMS 3331 are also used to specify fluorosilicone products. FVMQ (fluoro vinyl methyl silioxane) is the ASTM type for fluorosilicone.

Fluorosilicone, Flourosilicone, Florosilicone? Fluorosilicone Rubber?

Occasionally flourosilicone or florosilicone is mistakenly used to specify fluorosilicone products. Fluorosilicone is the correct term and spelling. Fluorinated silicone rubber is a more technical term for fluorosilicone. Fluorosilicone rubber is a common term for fluorosilicone, which is a synthetic material, not made from natural rubber.

Contact Stockwell Elastomerics for Fluorosilicone

Contact Us for further assistance with fluorosilicone / FVMQ / fluorosilicone rubber.

NORSEAL® and COHRlastic® are registered trademarks of Saint-Gobain.