Hydrogen Gaskets & Seals
Component-level sealing for hydrogen production, storage, transport, fuelling and end use.
Hydrogen containment depends on the complete component and its operating cycle. We start with the medium and purity, normal and maximum allowable conditions, pressure cycling and decompression rate, seal geometry, material condition, governing code and exact product evidence.
The Hydrogen Challenge
Permeation and Joint Leakage
Diffusivity, solubility, permeability and assembled-joint leakage are different quantities. Each varies with the exact compound or metal condition, thickness, pressure, temperature, compression, surface finish and test method. A family-level ranking cannot predict leakage from a finished joint.
Specify the test gas, method, sensitivity and acceptance criterion for the actual component. Helium can be a useful tracer where a validated hydrogen correlation exists, but its conservatism cannot be assumed across seal designs.
Metals and Pressure Cycling
Hydrogen effects depend on alloy composition and condition, strength, welds, heat treatment, temperature, pressure and loading. Austenitic stainless steels are often candidates, but no universal 700 MPa cut-off or 316L/Inconel mandate replaces a code- and component-specific assessment.
Flammability and Hazardous Areas
The familiar 4–75% flammability range in air is useful ambient-condition shorthand. Hydrogen is gas group IIC, but zone classification and extent come from the project's documented release and ventilation study. Do not assume a generic Zone 1 interior or Zone 2 envelope.
Climate Context
Hydrogen is an indirect climate forcer. Sand et al. (2023) modelled GWP₁₀₀ at 11.6 ± 2.8, with material uncertainty. Leakage should be minimised across production, transport, storage and use; a generic current-infrastructure leakage percentage is not used here.
Hydrogen at a Glance
Production Sealing
PEM and Alkaline Electrolysis
Stack and balance-of-plant duties differ. Confirm the electrolyte or water circuit, hydrogen or oxygen side, purity and cleanliness limits, normal and upset temperature, pressure and differential pressure, cycling, geometry and OEM-approved exact compound. ISO 22734-1:2025 addresses hydrogen-generator safety; it does not approve PTFE, EPDM or another material family.
Steam Reforming and ATR
Reaction temperature is not automatically the flange-metal or seal temperature. Use the equipment licensor's joint data for metal temperature, pressure, gas and oxygen composition, contaminants, cycling, flange, bolting, cleaning and governing code before selecting a filler or winding alloy.
Solid Oxide Systems
SOFC and SOEC equipment has stack, manifold and balance-of-plant joints at different temperatures. Select the exact sealing construction from the OEM design temperature, atmosphere, movement, start-stop cycle and acceptance test rather than from the process range alone.
Qualification Inputs
Provide the component, medium and concentration, contaminants, pressure, actual joint temperature, cycling and decompression rate, flange or groove geometry, oxygen exposure, purity controls, governing code and required product evidence. These inputs come before a material family.
Storage & Transport
Compressed Gas Storage
Storage pressure alone does not select a seal. Record the equipment type, normal and maximum allowable pressure and temperature, hydrogen purity, pressure-cycle and decompression rate, connection geometry, material condition, leakage criterion and governing vessel or component standard.
H70 is a nominal vehicle-fuelling pressure class where applicable, not a universal maximum for hydrogen systems. Dispensers, compressor stages, cascade storage, components, relief devices and tests can use different pressures set by their controlling standards and exact designs.
ISO 19881:2025 covers compressed-hydrogen fuel containers for land vehicles. It does not govern stationary storage generally. Stationary vessels, tube trailers and pipeline equipment each follow their own design code, supplier connection design and acceptance conditions.
Liquid Hydrogen
Liquid hydrogen is approximately –253 °C at ambient pressure. Use the governing cryogenic vessel or piping code and qualify the exact alloy or polymer grade, weld and heat-treatment condition, seal assembly, mating surfaces, thermal cycle and leakage test. Do not assign a family-wide cryogenic pressure rating or prohibit an entire steel family from landing-page shorthand.
Pipelines, Trailers and Carrier Systems
Use the actual pipeline, vessel or carrier design code and supplier connection. Gas composition, contaminants such as H₂S, pressure-temperature cycle, vibration, flange type and exact tested construction determine the seal. Sour-service standards apply only where H₂S duty brings them into scope.
Rapid Gas Decompression
Fuelling Infrastructure
Station and Dispenser Duty
H70 identifies a nominal vehicle-fuelling pressure class where applicable. The dispenser, nozzle, breakaway, hose, valves, compressor and cascade storage each have their own normal, maximum allowable, relief and test conditions. Use the controlling component standard and equipment design, not a generic 700 bar material limit.
ISO 19880-2:2025 covers hydrogen dispensers and dispensing systems. Fuelling protocol, pre-cooling, cycle duty and communications requirements must be taken from the exact station and vehicle interface. Qualify each proposed seal construction for its component, temperature, pressure ramp, decompression rate, wear and leakage criterion.
Current Australian Project Context
As checked in July 2026, Woodside's current Hydrogen Refueller @H2Perth record targets first production in the second half of 2026, initially about 235 kg/day and scalable to about 1,000 kg/day. These owner figures describe the project only; they do not prove a Universal Gaskets supply relationship or a particular seal requirement.
Hydrogen Blending
Blend percentage does not create a safe material boundary. The network owner must assess each pipe, valve, regulator, meter, seal and appliance for the proposed composition, pressure, operating cycle, asset condition and jurisdiction. Validate the exact seal compound; no percentage makes EPDM or another family suitable by default.
Component Data First
End-Use Applications
The controlling failure mode changes with the equipment. Fuel-cell stacks can be limited by extractables and compression cycling, hot ceramic systems by movement at the actual joint, combustion equipment by temperature and flame-safeguard duty, and purification equipment by cleanliness. Select against the documented component, not a general hydrogen material list.
PEM Fuel Cells
Stack seals need the exact OEM-qualified, low-extractable compound for the cell chemistry, plate and groove design, compression, cold-start and cycle duty. Silicone can be a candidate, but formulation, post-cure, leachables and catalyst compatibility must be proven for the product. Balance-of-plant seals are separate selections for their water, coolant, air or hydrogen side.
Solid Oxide Fuel Cells and Electrolysers
Cell operating temperature is not automatically the gasket-interface temperature. Confirm the actual joint temperature, atmosphere, electrical-insulation need, movement and thermal-cycle spectrum. Mica, glass-ceramic and composite systems are candidates only where the OEM joint design and qualification evidence support them.
Industrial Combustion
Hydrogen combustion produces no carbon dioxide at the point of combustion, but that does not establish lifecycle emissions and it can change flame speed, visibility and nitrogen-oxide controls. Specify the seal from the actual fuel composition, joint temperature, pressure, burner design and fire or emissions acceptance test; do not apply a generic filler recipe.
Hydrogen Purification
Fuel quality must meet the applicable ISO 14687:2025 application grade and project specification. Check the complete current impurity table rather than relying on selected limits. Seal cleanliness, extractables, outgassing and particle release need evidence for the exact product; an entire organic-material family is not excluded by default.
Material Selection for Hydrogen Service
Hydrogen compatibility is not a family-level approval. Record the component, geometry, medium and purity, normal and maximum allowable pressure and temperature, differential pressure, cycle spectrum, decompression rate, leakage criterion, design life and governing equipment specification before selecting a construction.
Polymers and Elastomers
Permeation, extrusion, compression set, wear and rapid-gas-decompression response depend on the exact compound, filler package, cure, geometry and test conditions. PTFE, HNBR, EPDM, FKM, silicone and other families contain materially different grades. Require product-level evidence that represents the intended pressure-temperature and cycling duty.
Metals and Metallic Gaskets
Hydrogen-assisted damage is specific to alloy, strength, heat treatment, weld condition, stress state, temperature, hydrogen pressure and loading history. Assess the exact winding, ring, facing and fastener material under the governing code. Do not approve all 316L or prohibit a complete steel or nickel-alloy family from one strength threshold.
Leakage and Decompression Evidence
Separate diffusion through a material, gas solubility, permeation through a seal and leakage through an assembled joint. Helium testing is useful only where the acceptance criterion and correlation to the hydrogen service are validated. Rapid-gas-decompression evidence must identify the exact compound, geometry, saturation state and decompression cycle.
Cryogenic Liquid Hydrogen
Liquid-hydrogen service is near -253 °C, but material suitability still depends on the exact grade, joint design, surface finish, bolt load, thermal movement, cycling and leakage test. Use the equipment supplier's qualified construction and cryogenic evidence; a broad stainless-steel or polymer label is insufficient.
Evidence Before Selection
Standards and Codes for Hydrogen Service
Start with the equipment, jurisdiction and contracted edition. These references define system, component, fuel-quality or vessel requirements within their stated scopes; none is a blanket approval for a gasket material. Edition status below was checked in July 2026 and must be verified again for the project.
Confirm the Complete Standards Set
Gaskets and Sealing Products for Hydrogen Service
The product families below can provide candidates for electrolyser balance-of-plant, piping, storage and fuelling components. Final suitability depends on the exact construction, equipment design, operating cycle and supporting product evidence.
Hydrogen Sealing FAQ
- What seals a hydrogen storage tank?
- The vessel and connection design set the seal. Confirm the governing code, hydrogen purity, normal and maximum allowable pressure and temperature, pressure-cycle and decompression rate, geometry, material condition and exact component qualification. ISO 19881:2025 covers compressed-hydrogen fuel containers for land vehicles; it is not a general stationary-storage standard.
- What is the best gasket material for hydrogen service?
- There is no universal best material or pressure cut-off. Selection depends on the exact compound or alloy condition, filler or heat treatment, geometry, temperature, hydrogen purity, pressure and decompression rate, cycle spectrum, stress state, failure criterion and governing equipment specification.
- Do fuel cells need special gaskets?
- Yes. Fuel-cell stack seals need an exact OEM-qualified, low-extractable compound for the cell chemistry, compression, cold-start and cycle duty. Silicone can be a candidate, but formulation, post-cure, leachables and catalyst compatibility must be validated rather than inferred from the polymer family.
- What materials suit hydrogen valve seals?
- Use the valve or dispenser manufacturer's qualified seal construction. ISO 19880-2:2025 applies to hydrogen dispensers and dispensing systems; it does not certify a polymer family. Verify the component's pressure-temperature cycle, decompression rate, geometry, wear, leakage criterion and exact product evidence.
- Does hydrogen embrittle gasket metals?
- Hydrogen can reduce ductility or fracture resistance in susceptible metals, but suitability is grade- and condition-specific. Assess alloy composition, strength, welds, heat treatment, temperature, pressure, loading and governing code. Do not approve or prohibit an entire alloy family from a single strength threshold.
Engineering Guides for Hydrogen Service
Use these construction, compatibility and pressure-temperature references as initial screening tools, then qualify the exact product and component duty. See also our renewable energy industry page for wind, solar and battery-storage duties that intersect with hydrogen production.
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Start with the Exact Hydrogen Duty
Send the component, geometry, medium and purity, operating and upset conditions, cycle and decompression duty, governing specification and required evidence. We can then identify constructions for project review.
- Selection based on component conditions and product-level evidence
- Metallic, semi-metallic and soft-gasket candidates
- Standards checked for exact equipment and jurisdictional scope
Disclaimer
This page is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.
Temperature ranges, chemical resistance ratings, and mechanical properties cited on this page are typical values for standard grades. Actual performance varies with compound formulation, filler package, and service conditions — contact us to confirm suitability for your specific application.