ISO 8829-2:2006

Overview

ISO 8829-2:2006 - “Aerospace - Test methods for polytetrafluoroethylene (PTFE) inner‑tube hose assemblies - Part 2: Non‑metallic braid” defines standardized test methods for flexible PTFE inner tubes with non‑metallic braided covers used in aircraft fluid systems. The standard specifies how to qualify hoses and hose assemblies (including the hose coupling) across the relevant pressure classes and temperature types (as referenced in ISO 6771). Tests simulate demanding in‑service conditions so assemblies used in safety‑critical systems meet repeatable, auditable performance criteria.

Key topics and technical requirements

• Scope & applicability
  • Applies when referenced in procurement or specification documents.
  • Covers hose and hose coupling; connecting end fitting assembly requirements are handled in procurement specifications.
• Test environment
  • Standard test temperature range: 15 °C to 32 °C (59 °F to 90 °F).
• Material and tube tests
  • Density and relative density (crystallinity control) per ISO 7258.
  • Tensile testing of PTFE tubing (strength and elongation) with defined specimen geometry and test procedures.
  • Rolling tests to detect sintered‑tube flaws followed by proof‑pressure tests.
  • Electrical conductivity checks for applicable constructions.
• Hose and assembly tests
  • Stress‑degradation, pneumatic effusion, pneumatic leakage and vacuum tests.
  • Volumetric expansion, leakage, proof‑pressure and burst‑pressure tests.
  • Dynamic tests: impulse, pneumatic surge, flexure, push‑pull and low‑temperature flexure.
  • Environmental aging: thermal shock, light‑radiation aging, fuel resistance and fire testing.
• Supporting information
  • Annex A lists recommended test fluids.
  • Normative references include ISO 6771 (pressure/temperature classifications), ISO 6772/6773 (impulse and thermal shock), ISO 7258 and others.

Practical applications

• Use ISO 8829-2:2006 to:
  • Qualify PTFE inner‑tube hose assemblies with non‑metallic braids for hydraulic, fuel, oil and pneumatic systems in aircraft.
  • Establish acceptance criteria in procurement specifications for aerospace OEMs and suppliers.
  • Define laboratory test programs for component qualification, quality assurance and certification evidence.
• Typical users:
  • Aerospace OEMs and Tier‑1 suppliers, hose manufacturers, test laboratories, procurement and quality engineers, and certification authorities.

Related standards

• ISO 8829-1 (Part 1: Metallic (stainless steel) braid)
• ISO 6771 (Aerospace fluid systems - Pressure and temperature classifications)
• ISO 7258 (PTFE tubing density tests)
• ISO 6772, ISO 6773 (impulse and thermal shock test methods)
• ISO 2685 (resistance to fire in designated zones)

Keywords: ISO 8829-2:2006, PTFE inner-tube hose assemblies, non‑metallic braid, aerospace hose tests, proof-pressure, burst-pressure, impulse test, flexure test, hose qualification.