FKM Fluororubber H-Cell Gaskets

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FKM Elastomeric Gaskets for Acidic, Hydrocarbon, and Gas-Tight Electrolyte Environments

For a superior re-sealing on H-cell flange under a broad range of demanding environments

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FKM fluoroelastomer gaskets provide a resilient, elastomeric seal for H-type electrochemical cells operating in acidic, hydrocarbon-exposed, or gas-tight electrolyte environments. The elastomeric structure of FKM provides a stronger compression recovery, maintaining sealing pressure and re-sealing reliably across repeated clamping cycles. It is well suited to applications needing a tight, flexible seal that standard silicone or rigid PTFE-based seals cannot provide.

With superior resistance to a broad range of chemicals, you can confidently work with strong acids, alkalis, and solvents. While concentrated mineral acids such as sulfuric, hydrochloric, or nitric acid attack the chemical structure of silicone over time, the fluorinated backbone of FKM remains stable under the same exposure. FKM also holds up well against hydrocarbons and organic solvents, fuels, aromatic oils, and chlorinated solvents, environments where silicone lacks the same chemical resistance and is more prone to swelling and losing its shape under prolonged exposure.

A further advantage over silicone is gas-tight retention. Silicone has notably high CO₂ permeability, making it poorly suited to gas-tight sealing, whereas fluorinated elastomers like FKM sit at the low-permeability end of the scale. This matters directly for experiments tracking gas-evolution products, such as CO₂ reduction or water electrolysis, where reduced atmospheric crossover improves the accuracy of gas quantification.

Acid Stability

Excellent resistance to strong acids like high con. nitric and sulfuric acid

Low Gas Permeability

Supports accurate gas-evolution tracking

Reliable Reusability

Strong elastomeric compression recovery supporting repeated use

Popular Size

Fits standard dual-chamber electrochemical setups

Specifications

Please note: FKM does not perform well with ketones (acetone or MEK), esters, aliphatic and aromatic amines, or low-molecular-weight organic acids, such as concentrated acetic or formic acid. All will cause rapid swelling and mechanical breakdown of the material. Concentrated strong bases above roughly 10% (NaOH, KOH) are also outside FKM's working range, consistent with published degradation studies in alkaline media. For strongly alkaline electrolytes or systems involving these substances, an ePTFE gasket is the more chemically robust choice.

Material	FKM Fluororubber
Window Diameter	15 mm
Outer Diameter	30 mm
Thickness	1.0 mm
Color	Black
Pack Size	10

H-Cell Gaskets Dimension Diagram — Diagram of the FKM Fluororubber Gasket for H-cells

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