Hydrogen gas permeability test service

Hydrogen Gas Permeability Testing Service – Comprehensive Evaluation of Barrier Performance for Polymer Pipes, Liners, Seals and Composite Materials

As an ISO/IEC 17025 accredited independent testing laboratory, we offer specialised hydrogen gas permeability testing services to manufacturers, engineering contractors, and quality assurance teams across the oil and gas, hydrogen energy, petrochemical, automotive, aerospace, and advanced materials sectors. Hydrogen is the smallest and most mobile gas molecule, making it highly challenging to contain. Its permeation through polymer pipes, liners, seals, gaskets, and composite barriers is a critical concern for hydrogen storage, transportation, and utilisation systems – affecting safety, efficiency, material integrity, and environmental compliance. Our hydrogen permeability test protocols quantify the steady‑state gas transmission rate, permeability coefficient, and diffusivity of your materials under controlled temperature and pressure conditions, providing essential data for material selection, system design, seal qualification, and emissions estimation. All methods are aligned with ISO 15105‑1 (Plastics – Determination of gas transmission rate – Part 1: Differential‑pressure method), ASTM D1434 (Determination of gas permeability of plastic films and sheeting), ISO 2782‑1 (Rubber – Determination of permeability to gases – Part 1: Differential‑pressure methods), ASTM F739 (Permeation of liquids and gases through protective clothing materials), and GB/T 1038 (Plastics – Determination of gas permeability). Our reports are recognised by national energy agencies, hydrogen safety regulators, pipeline operators, and international certification bodies for product qualification, emissions reporting, and quality assurance.

Materials and Products We Regularly Test for Hydrogen Permeability

Our permeation test facilities accommodate a wide range of materials, components, and finished products used in hydrogen service and hydrogen‑sensitive applications. Typical test articles include:

• Polymer pipes and liners – polyethylene (PE), polyamide (PA), polyvinylidene fluoride (PVDF), and multi‑layer composite pipes for hydrogen gas transmission and distribution
• Elastomeric seals and gaskets – EPDM, NBR, FKM (Viton®‑type), HNBR, and silicone rubber seals for valves, flanges, connectors, and hydrogen compressors
• Protective coatings and linings – epoxy, polyurethane, and rubber coatings applied to steel pipes, tanks, and hydrogen storage vessels
• Hydrogen storage materials – polymer liners for composite overwrapped pressure vessels (COPVs), barrier films, and gas barrier membranes
• Composite materials – filament‑wound and laminated composites for hydrogen storage and transport (Type IV and Type V hydrogen tanks)
• Barrier films and packaging materials – multi‑layer films, metalised films, and coated materials for hydrogen‑sensitive applications
• Seals and O‑rings for hydrogen‑handling equipment – compressor seals, valve stem seals, and connector seals in hydrogen refuelling stations and fuel cell systems
• Fuel cell components – polymer electrolyte membranes, gaskets, and sealants for PEM fuel cells

Test Methods – Differential‑Pressure and Carrier‑Gas Techniques for Hydrogen Permeation

• Differential‑pressure gas permeability test – ISO 15105‑1 / ASTM D1434 / GB/T 1038 – We mount a flat specimen of the test material (film, sheet, or membrane) between two chambers in a gas permeation cell. The upstream chamber is pressurised with hydrogen (or a specified hydrogen‑containing gas mixture) at a controlled pressure (typically 0.1‑1.0 MPa, or higher for high‑pressure hydrogen applications). The downstream chamber is initially evacuated or maintained at a fixed lower pressure. The pressure rise in the downstream chamber (or the concentration increase) is monitored using a high‑precision pressure transducer or a gas chromatograph equipped with a thermal conductivity detector (TCD) or a mass spectrometer. The steady‑state gas transmission rate (GTR, in mol/m²·s or cm³/m²·day) and the permeability coefficient (P, in mol·m/m²·s·Pa or Barrer) are calculated from the measured steady‑state flow rate and the specimen thickness.
• Carrier‑gas (continuous flow) method – ISO 2782‑1 / ASTM D1434 – for lower permeability materials – In the carrier‑gas method, a continuous flow of an inert carrier gas (e.g., nitrogen, helium, or argon) passes through the downstream side of the permeation cell, carrying the permeated hydrogen to a detector (e.g., a thermal conductivity detector – TCD, a flame ionisation detector – FID, or a mass spectrometer). The carrier gas method provides higher sensitivity and is suitable for measuring very low hydrogen permeation rates (down to 10⁻¹² mol·m/m²·s·Pa).
• High‑pressure hydrogen permeation testing – for pipeline and storage applications – For polymer pipes, liners, and seals intended for high‑pressure hydrogen service, we perform permeability tests at hydrogen pressures up to 100 MPa (1 000 bar) using a specially designed high‑pressure permeation cell with heated chambers and pressure‑regulated upstream supply. The test is performed at the specified pressure and temperature to simulate the actual service conditions – particularly important for hydrogen refuelling stations and high‑pressure storage.
• Temperature‑dependent hydrogen permeability – for modelling hydrogen loss across temperature cycles – We measure hydrogen permeability at multiple temperatures (typically 5 °C, 23 °C, 40 °C, 60 °C, and 80 °C) to determine the temperature coefficient of permeability and to estimate hydrogen loss under varying field conditions. The activation energy of permeation (Ep) is calculated from the Arrhenius plot of ln(P) vs. 1/T.
• Hydrogen permeation with gas mixtures – simulating realistic gas composition – For applications involving hydrogen blended with other gases (e.g., natural gas‑hydrogen blends, hydrogen‑CO₂ mixtures), we perform permeation tests with a gas mixture that matches the specified composition. The test identifies any competitive or synergistic effects between the gases and measures the hydrogen permeability in the mixture.
• Hydrogen permeation at elevated temperatures – for high‑temperature applications (fuel cells, high‑temperature electrolysis) – For polymer electrolyte membranes and high‑temperature seals used in fuel cells and electrolysis systems, we perform hydrogen permeation tests at temperatures up to 200 °C using a heated permeation cell and high‑temperature‑compatible seals.

Sample Preparation and Conditioning – Ensuring Representative Measurement

• Specimen preparation – for film, sheet, and pipe samples – For films and sheets, we cut circular or rectangular specimens (typically 100‑200 mm diameter) from the test material, ensuring that the surfaces are free from defects, scratches, or contamination. For pipe samples, we cut sections and flatten them (for permeation cells) or use a pipe‑specific permeation cell with a curved sample holder. The specimen thickness is measured at multiple points using a calibrated micrometer (accuracy ±0.001 mm), and the average thickness is used in the permeability calculation.
• Conditioning – stabilising the specimen at the test temperature and humidity – Before the test, the specimen is conditioned at the test temperature (and humidity, if applicable) for a minimum of 24 hours (or until the specimen reaches thermal and moisture equilibrium). The conditioning ensures that the permeation measurement is not affected by transient moisture or thermal gradients.
• Edge sealing and masking – to prevent edge leakage – The specimen is sealed in the permeation cell using an appropriate sealing system (O‑rings, gaskets, or clamp plates) to prevent gas leakage around the edges. For non‑uniform materials, the effective permeation area is defined by a mask that limits the test area to a known, uniform region.
• Safety precautions for high‑pressure hydrogen testing – For high‑pressure hydrogen tests, we use a specialised test cell with a calibrated burst disc, remote pressurisation controls, and a hydrogen‑compatible pressure relief system. The test area is equipped with hydrogen detectors and a ventilation system to ensure safety in the event of a leak.

Data Analysis and Permeability Parameter Calculation

• Steady‑state gas transmission rate (GTR) – the volumetric or molar flow rate per unit area – The GTR is calculated from the steady‑state pressure rise (or concentration increase) in the downstream chamber: GTR = (ΔP/Δt) × (V / (R × T × A)), where ΔP/Δt is the pressure change rate, V is the downstream volume, R is the gas constant, T is the temperature, and A is the permeation area.
• Permeability coefficient (P) – the intrinsic gas transport property of the material – The permeability coefficient is calculated from the GTR and the specimen thickness (t): P = GTR × t / Δp, where Δp is the pressure difference across the specimen. The permeability coefficient is typically expressed in Barrer (1 Barrer = 10⁻¹⁰ cm³(STP)·cm/(cm²·s·cmHg)).
• Diffusivity (D) – a measure of the gas mobility in the material – The diffusivity (D) is derived from the time lag (θ) using the relationship: D = t² / (6 × θ), where t is the specimen thickness and θ is the time lag (the time at which the permeation reaches steady state). The diffusivity provides insight into the gas transport mechanism and the molecular structure of the material.
• Solubility (S) – the gas concentration in the material at equilibrium – The solubility (S) is calculated from the permeability and diffusivity: S = P / D. The solubility indicates the equilibrium gas uptake by the material and is a measure of the gas‑material interaction.
• Normalised permeation rate – for direct comparison of different materials – For pipe and seal qualification, we also report the normalised permeation rate (the permeation rate per unit length or per unit area) to allow direct comparison of different materials and thicknesses.

Specialised Applications – Pipe Permeation, Seal Leakage and Storage Liner Testing

• Hydrogen pipe permeation testing – full‑scale and small‑scale methods – ISO 9080 / ASTM F2634 – For polymer gas pipes intended for hydrogen transport, we perform permeation testing on both flat specimens (cut from the pipe wall) and on full‑scale pipe sections (with the pipe ends sealed). The full‑scale method measures the total hydrogen loss from the pipe (including through the wall and through the seals) and is used for compliance with gas distribution standards.
• Seal and gasket permeation – measuring the hydrogen transmission through elastomeric seals – ASTM F739 / ISO 6529 – We test elastomeric seals (O‑rings, gaskets, and valve seals) by installing them in a custom permeation cell that replicates the actual sealing configuration. The permeation rate is measured under the specified compression and pressure conditions, providing data for assessing the long‑term hydrogen loss from flanged joints and valve assemblies.
• Hydrogen storage liner permeation – for composite overwrapped pressure vessels (COPVs) – For polymer liners used in Type IV hydrogen tanks, we test the hydrogen permeability of the liner material under simulated service conditions – high pressure (up to 100 MPa) and temperature cycling (‑40 °C to +85 °C). The test assesses the liner's ability to act as a barrier to hydrogen, preventing gas permeation into the composite overwrap and the surrounding environment.
• Multi‑layer barrier materials – measuring the overall hydrogen barrier performance of laminated structures – We test multi‑layer films and composite materials (e.g., PE/EVOH/PE, aluminium‑laminated films) to measure the overall hydrogen permeation rate of the entire structure. The test identifies the barrier contribution of each layer and helps to optimise the material design.
• High‑temperature hydrogen permeation for fuel cell and electrolysis applications – For polymer electrolyte membranes used in PEM fuel cells, we measure hydrogen crossover (permeation) at the operating temperature (80‑120 °C) and at specified humidity levels. The hydrogen crossover is a critical performance parameter that affects fuel cell efficiency and durability.

Regulatory Compliance and Hydrogen Safety Standards – Supporting Emission Control and Leak Detection

• Hydrogen emissions estimation – using permeation data to calculate fugitive emissions – We provide the hydrogen permeability data needed to estimate the fugitive hydrogen emissions from pipeline systems, storage facilities, and hydrogen refuelling stations. The data is used for greenhouse gas (GHG) emissions reporting and for hydrogen safety assessments.
• Material qualification for hydrogen service – meeting national and international standards – We perform hydrogen permeability testing in accordance with the requirements of hydrogen‑related standards, including ISO 19880‑1 (Hydrogen refuelling stations), ISO 22734 (Hydrogen gas generators), and national equivalents (e.g., ASME B31.12 for hydrogen piping, GB/T 34542 for hydrogen storage). The test results are used for material qualification and for compliance with pipeline safety regulations.
• Hydrogen safety assessment – for hydrogen containment and transport – For hydrogen handling and storage equipment, we assess the hydrogen permeation through seals, gaskets, and polymer components to ensure that the equipment meets the required leak‑tightness and safety standards.

Test Standards and Specification Compliance

Our hydrogen gas permeability testing is performed in accordance with the most widely used international and national standards. The most commonly requested include:

• ISO 15105‑1 – Plastics – Determination of gas transmission rate – Part 1: Differential‑pressure method
• ASTM D1434 – Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting
• ISO 2782‑1 – Rubber – Determination of permeability to gases – Part 1: Differential‑pressure methods
• ASTM F739 – Standard Test Method for Permeation of Liquids and Gases through Protective Clothing Materials under Conditions of Continuous Contact
• GB/T 1038 – Plastics – Determination of gas permeability – the Chinese national standard for gas permeability testing
• ASTM D7175 – Standard Test Method for Determining the Methane Permeation of Geosynthetics (adaptable for hydrogen)
• ISO 9080 – Plastics piping and ducting systems – Determination of the long‑term hydrostatic strength of thermoplastics materials in pipe form
• ASME B31.12 – Hydrogen Piping and Pipelines – for hydrogen pipeline qualification
• ISO 19880‑1 – Gaseous hydrogen – Fuelling stations – Part 1: General requirements – for hydrogen station component qualification

Report Acceptance and Regulatory Recognition

All hydrogen gas permeability tests are conducted under our ISO/IEC 17025 accreditation, using calibrated permeation cells, gas chromatographs, pressure transducers, and temperature controllers, all traceable to national and international reference standards. Our final test reports include: a complete description of the test material, the test conditions (temperature, pressure, gas composition), the measured gas transmission rate (GTR), the permeability coefficient (P), the diffusivity (D), the solubility (S), the statistical summary (mean, standard deviation, coefficient of variation), and a clear pass/fail verdict against your specified acceptance criteria. These reports are accepted by national energy agencies, hydrogen safety regulators, pipeline operators, and international certification bodies for product qualification, emissions reporting, and quality assurance. Bilingual (English/Chinese) versions are available to facilitate submissions to domestic and international authorities and to support your global market access.