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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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | 1/8″ | 1/4″ | 3/8″ | 1/2″ | Test Method |
| Cell Structure | Closed Cell | Closed Cell | Closed Cell | Closed Cell | — |
| Surface | Integral Skin Both Sides | Integral Skin Both Sides | Integral Skin Both Sides | Integral Skin Both Sides | — |
| Density (lbs per cubic foot) | 19 | 17 | 15 | 10 | — |
| Water Pick-Up (% Weight Increase) | 0.00% | 0.02% | 0.06% | 0.01% | — |
| Thickness Tolerance (+) | +.050 | +.060 | +.080 | +.125 | — |
| Thickness Tolerance (-) | -.030 | -.060 | -.080 | -.125 | — |
Mechanical Properties
| Property | 1/8″ | 1/4″ | 3/8″ | 1/2″ | Test Method |
| Compression Deflection, 25% — Original (psi) | 6.5 | 5.5 | 4.0 | 3.5 | — |
| Compression Deflection, 25% — 7 Days @ 400°F (psi) | 9.0 | 7.5 | 6.0 | 5.0 | — |
| Compression Set, 22 Hours @ 75°F (%) | 27% | 13% | 14% | 17% | — |
| Compression Set, 22 Hours @ 158°F (%) | 100% | 100% | 100% | 100% | — |
| Low Temperature Brittleness (°F) | -10°F | -10°F | -10°F | -10°F | — |
Thermal Properties
| Property | Value | Test Method |
| Temperature Range | -10°F to +400°F | — |
Chemical Resistance
| Property | Value | Test Method |
| Resistance to Aliphatic and Aromatic Hydrocarbons | Yes | — |
| Resistance to Oils and Fuels | Yes | — |
| Resistance to Acids and Solvents | Yes | — |
| Resistance to Ozone and Weather | Yes | — |
| Resistance to Lubricants and Hot Water | Yes | — |
- Low-pressure sealing applications in fuel and oil systems where sponge compressibility is required over dense Viton sheet
- Gaskets and seals for high-temperature applications up to 400°F in contact with hydrocarbons, fuels, or solvents
- Conformable sealing against irregular surfaces in chemical processing, automotive, and aerospace assemblies
- Vibration isolation and cushioning in environments with oil, fuel, or acid exposure
- Weather sealing and environmental protection in applications requiring ozone, UV, and chemical resistance
Common industries: Automotive, aerospace, chemical processing, oil and gas, industrial equipment.
Closed Cell Viton FKM Sponge is a closed cell sponge rubber sheet manufactured from genuine Chemours Viton polymer — a fluoroelastomer material specifically selected for its exceptional resistance to aliphatic and aromatic hydrocarbons, oils, fuels, ozone, weather, lubricants, acids, and hot water. Both surfaces feature an integral skin that improves tear resistance and provides non-absorbent sealing performance.
The closed cell structure results in minimal water pick-up across all thicknesses. This product is designed for low-pressure sealing applications where the compressibility and conformability of a sponge form factor offer advantages over dense solid Viton sheet, particularly in applications requiring a soft, conformable seal against irregular surfaces at elevated temperatures.
Physical properties including compression deflection, compression set, density, and thickness tolerances vary by thickness and are presented as typical values. Note that elevated temperature under compression will adversely affect the resilience of this material, as reflected in the 100% compression set at 22 hours @ 158°F across all thicknesses. All values are typical and should not be used for specification purposes.
For specific application recommendations, contact H-O Products Corporation technical support. Viton is a registered trademark of The Chemours Company FC, LLC.
What differentiates Closed Cell Viton FKM Sponge from solid FKM/Viton® sheet material?
Closed Cell Viton FKM Sponge provides the same broad chemical resistance profile as solid Viton FKM sheet — including resistance to aliphatic and aromatic hydrocarbons, oils, fuels, acids, and solvents — in a compressible, conformable sponge form factor with an integral skin on both sides. It is specifically designed for low-pressure sealing applications where the stiffness of dense solid Viton sheet is not practical and where the gasket must conform to irregular surfaces. The tradeoff is that compression set at elevated temperature (100% at 22 hours @ 158°F) is significantly higher than solid FKM grades, and elevated temperature under compression adversely affects resilience.
Why is compression set an important consideration for closed cell FKM sponge?
sustained compression. In sealing applications, high compression set means the material permanently flattens under load, losing its ability to maintain sealing force over time. The TDS notes that elevated temperature under compression will adversely affect the resilience of this material — reflected in the 100% compression set at 22 hours @ 158°F across all thicknesses — and recommends that end-users contact H-O Products Corporation technical support for specific application guidance. The lower compression set values at 75°F (13%–27% by thickness) indicate better recovery under ambient temperature service conditions.
What is the temperature range for Closed Cell Viton FKM Sponge?
Closed Cell Viton FKM Sponge has a temperature range of -10°F to +400°F, as listed on the TDS.
Is Closed Cell Viton FKM Sponge suitable for fuel, oil, and chemically aggressive environments?
Yes. The TDS states resistance to aliphatic and aromatic hydrocarbons, oils, fuels, ozone, weather, lubricants, acids, and hot water. It is manufactured from genuine Chemours Viton polymer. No specific compliance standards are cited on the TDS; for application-specific recommendations, contact H-O Products Corporation technical support.
How should Closed Cell Viton FKM Sponge be specified?
Specify grade (Closed Cell Viton FKM Sponge), thickness, dimensional tolerances (note that thickness tolerances vary by gauge as listed in the specifications), and finished format. Contact H-O Products Corporation technical support for specific application recommendations.
