Fluoroelastomer (FKM / Viton®)

Fluoroelastomer is the material of choice when chemical aggression, elevated temperatures above 300°F, or aerospace fuel and hydraulic system specifications eliminate all standard rubber compounds from consideration. Its fluorocarbon chemistry provides near-universal resistance to aliphatic and aromatic hydrocarbons, oils, fuels, and mineral acids at continuous service temperatures up to 500°F, and carries the qualification credentials — AMS 3216, MIL-R-83248 — required for QPL-approved aerospace sealing. H-O Products carries the full range of FKM families, from commercial solid and sponge grades through Fluorozone® Mil-Spec Performance FKM made with 3M™ Dyneon™ polymer and Viton™ A AMS 3216 aerospace-spec sheet, and converts them to customer specification.

75 Durometer FKM/VITON® (Fluoroelastomer)

75 Durometer FKM/VITON® (Fluoroelastomer) is a 75 Shore A fluoroelastomer sheet material with 66% fluorine content, designed for gaskets in fuel and oil systems, high-temperature environments, and solvent-resistant applications. It delivers 1,000 psi minimum tensile strength (1,250 psi typical) and 200% minimum elongation (300% typical), with a service temperature range of -20°F to 400°F. The material passes CA Prop 65, is produced with no regrind or recycled materials, and is Made in the USA.

Key Properties

  • Durometer / Hardness (Shore A): 75 ±5 — —
  • Tensile Strength (Minimum): 1,000 psi — —
  • Elongation (Minimum): 200% — —
  • Temperature Range: -20°F to 400°F — —
  • Fluorine Content: 66% — —
  • Resistance to Oil and Fuel: Yes — —
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75 Durometer FKM/VITON® (Fluoroelastomer)

Fluorozone® Mil-Spec Performance FKM AMS 3216 / MIL-R-83248C

Fluorozone Mil-Spec Performance FKM is a 75 durometer Shore A fluoroelastomer (FKM/Viton®-family) sheet rubber formulated to meet the AMS 3216 specification (supersedes MIL-R-83248) and qualified to MIL-R-83248C Type II Class 1. The compound delivers 1850 psi typical tensile strength and 150% typical ultimate elongation across an operating temperature range of -20°F to +500°F. Compared to Fluorozone Premium Performance grade, this material exhibits a higher temperature range and increased tensile strength, with strong resistance to aliphatic hydrocarbon fluids, oils, fuels, lubricants, and most mineral acids.

Key Properties

  • Durometer Hardness: 75 Shore A (± 5)
  • Tensile Strength: 1600 psi minimum / 1850 psi typical
  • Ultimate Elongation: 125% minimum / 150% typical
  • Operating Temperature: -20°F to +500°F
  • Available Thickness: Rolls 1/64" – 1/4"; Molded Sheets up to 4"
Estimated Weight (1/8" × 36"): 3.55 lb per linear foot
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Fluorozone® Mil-Spec Performance FKM AMS 3216 / MIL-R-83248C

Closed Cell Viton FKM Sponge

Closed Cell Viton FKM Sponge is a closed cell fluoroelastomer sponge rubber sheet manufactured from genuine Chemours Viton polymer, featuring an integral skin on both sides for improved tear resistance and non-absorbent sealing. It is resistant to aliphatic and aromatic hydrocarbons, oils, fuels, ozone, weather, lubricants, acids, and hot water, with a service temperature range of -10°F to +400°F. It is ideal for low-pressure sealing applications where dense Viton sheet material is not practical. All values shown are typical and should not be used for specification purposes.

Key Properties

  • Compression Deflection, 25% — Original: 3.5–6.5 psi (varies by thickness)
  • Compression Set, 22 Hours @ 75°F: 13%–27% (varies by thickness)
  • Density: 10–19 lbs per cubic foot (varies by thickness)
  • Water Pick-Up (% Weight Increase): 0.00%–0.06% (varies by thickness)
  • Low Temperature Brittleness: -10°F (all thicknesses)
  • Temperature Range: -10°F to +400°F
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Closed Cell Viton FKM Sponge