Overview - ISO 9528:2022 (PTFE hose assemblies, procurement specification)
ISO 9528:2022 is the international procurement specification for standard‑weight polytetrafluoroethylene (PTFE) hose assemblies used in aerospace. It covers hose assemblies classified for service up to +204 °C and a nominal pressure up to 21 000 kPa (210 bar) and is intended primarily for aircraft hydraulic systems (also suitable for some pneumatic uses where gaseous diffusion through the PTFE liner is acceptable). The document defines requirements for materials, construction, performance testing, quality assurance and marking to support safe procurement and interchangeability.
Key topics and technical requirements
The standard addresses the full lifecycle of PTFE hose assemblies from design to delivery. Major technical topics include:
- Scope and classification - service temperature (‑55 °C to +204 °C) and nominal pressure (21 000 kPa).
- Materials - requirements for PTFE inner tubes, metallic reinforcements and fittings.
- Construction - inner tube, reinforcement layers, swaged or attached fittings and dimensional requirements.
- Mechanical and physical properties - density, tensile strength, elongation, tube roll and bore integrity.
- Electrical conductivity - criteria where applicable (e.g., static dissipation).
- Performance tests included in procurement and qualification:
- proof pressure and burst pressure
- impulse and thermal shock
- volumetric expansion, elongation/contraction
- leakage and pneumatic effusion
- assembly flexibility, stress degradation and repeated installation
- fire resistance (where specified)
- Quality assurance and inspection - qualification testing, periodic control, sampling, test reports and re‑qualification criteria.
- Preparation for delivery - packaging, storage, marking and ordering data to ensure traceability and interchangeability.
Practical applications and who uses ISO 9528:2022
ISO 9528:2022 is intended for organizations involved in the procurement, manufacture, certification and maintenance of aerospace fluid systems:
- Aircraft OEMs specifying hydraulic/pneumatic hose assemblies
- Hose manufacturers and component suppliers (fabrication, fittings)
- Aerospace MRO (maintenance, repair and overhaul) organizations
- Design and systems engineers (hydraulics/pneumatics)
- Quality, procurement and regulatory compliance teams ensuring traceable supplier conformity
Using ISO 9528 helps ensure compatibility, safety and performance of PTFE hose assemblies in demanding aerospace environments and facilitates clear procurement requirements.
Related standards and guidance
For broader context consult other aerospace fluid‑systems standards and the work of ISO/TC 20 (Aircraft and space vehicles), national adoption documents and complementary standards for hose fittings, thread specifications and flammable fluid handling practices. For procurement implementation, reference the ordering data, marking and QA clauses in ISO 9528:2022.