ISO 14687:2025

Overview - What ISO 14687:2025 covers

ISO 14687:2025, "Hydrogen fuel quality - Product specification", defines minimum hydrogen fuel quality characteristics for distributed hydrogen used in residential, commercial, industrial, vehicular and stationary applications. The second edition replaces ISO 14687:2019 and updates product specifications to reflect recent research and changing industrial needs. The standard addresses classification of hydrogen quality grades, impurity limits, sampling and analytical methods, and quality control practices for hydrogen fuelling applications.

Key technical topics and requirements

• Fuel quality specifications: Defines impurity parameters and minimum quality characteristics for different application classes (notably PEM fuel cells for road vehicles and stationary systems). Grades (e.g., Grade D, Grade E) are provided to balance performance and cost. Informative Annex F introduces Grades F‑1/F‑2 for internal combustion engine applications.
• Analytical methods and verification: Specifies requirements for laboratory and production analysis, including reference to analytical protocols for PEM fuel cell applications.
• Sampling procedures: Details sampling points (including the concept of the boundary point between supply equipment and fuel cell systems), sample sizes and handling for gaseous and vaporized liquid samples.
• Quality control and production qualification: Outlines fuel quality control, verification tests, reporting of results and qualification test requirements for producers and station operators.
• Terminology and definitions: Establishes consistent terms (e.g., contaminant, boundary point, hydrogen fuel index) to support harmonized implementation.
• Supporting rationale and guidance: Informative annexes provide rationale for impurity selections, guidance on boundary point selection, PSA considerations and parameter rationales for non‑PEM applications.

Practical applications - who uses this standard

ISO 14687:2025 is essential for:

• Hydrogen producers and suppliers - to set product specifications and ensure compliant delivery.
• Hydrogen fuelling station operators - for on‑site quality control, sampling and verification.
• Fuel cell and vehicle OEMs - to define acceptable fuel quality for PEM fuel cell systems.
• Stationary power system integrators - to specify hydrogen feed quality and contractual requirements.
• Testing laboratories and certification bodies - to perform analytical verification and produce qualification reports.
• Regulators and infrastructure planners - to align safety, interoperability and market requirements for hydrogen refuelling networks.

Related standards

• ISO 19880‑8 - Gaseous hydrogen - Fuelling stations - Part 8: Fuel Quality Control (operations and QC practices).
• ISO 19880‑9 - Gaseous hydrogen - Fuelling stations - Part 9: Sampling for fuel quality analysis (sampling methods).
• ISO 21087 - Gas analysis - Analytical methods for hydrogen fuel - PEM fuel cell applications for road vehicles (laboratory methods and detection limits).

ISO 14687:2025 is a practical reference for anyone specifying, producing, transporting or using hydrogen as a fuel and supports reliable, interoperable hydrogen infrastructure and safe PEM fuel cell operation.