ISO 14624-7:2006

Overview

ISO 14624-7:2006 - “Space systems - Safety and compatibility of materials - Part 7: Determination of permeability and penetration of materials to aerospace fluids” defines test equipment, procedures and reporting for evaluating how materials behave when exposed to aerospace fluids. The standard focuses on identifying liquid penetration and vapour/liquid permeation, and on detecting material reactivity when exposed to cleaning agents, lubricants, propellants and other aerospace fluids. It is intended to support material selection, protective equipment choice, and safety in ground support and processing operations.

Key topics and requirements

• Test types
  • Penetration test: small-volume liquid exposure on a specimen to observe first droplet breakthrough and any wetting beneath materials used in garments.
  • Permeation (permeability) test: measures vapour or liquid permeation rates and breakthrough time; tests may be conditioned (simulating used/aged materials) or unconditioned (as-received).
• Sample preparation and inspection
  • Test in intended use form and as‑received thickness; clean and dry per end‑use specs; inspect for flaws and weigh/identify samples.
• Safety precautions
  • Conduct tests in approved laboratory hoods; use dedicated hoods for oxidizers and fuels; minimum PPE: fluid-compatible gloves, apron, face shield/goggles.
• Test configuration
  • Follow ISO 6529 / ISO 6530 methods or equivalent; special fixture and conditioning steps (including exposure cycles with typical propellants) are specified.
• Reporting requirements
  • Minimum report items include material ID, test method, temperature/pressure/duration, sample thickness, observed penetration/breakthrough time, steady-state permeability rate (µg/mm^2/min), detection threshold and any observed reactivity or post-test degradation.

Applications and users

ISO 14624-7:2006 is practical for:

• Materials engineers evaluating chemical compatibility and selecting polymers, coatings, seals and garment materials for aerospace applications.
• Safety and test laboratories performing standardized permeability and penetration testing for compliance and qualification.
• Procurement and quality teams specifying acceptance criteria for parts and protective clothing.
• Ground support and operations personnel assessing splash/spill risks and appropriate PPE for handling aerospace fluids.
• Regulatory and certification bodies requiring documented test evidence of materials compatibility.

Practical uses include screening candidate materials for resistance to propellants and cleaning agents, determining PPE performance against spills, and documenting breakthrough and steady‑state permeation rates for hazard analyses.

Related standards

• ISO 6529 - Protective clothing - resistance to permeation
• ISO 6530 - Protective clothing - resistance to penetration
• ISO 14951-3 - Fluid characteristics - Nitrogen
• ISO 4954 - Stainless steels for fixtures
• Other parts of ISO 14624 (Parts 1–6) addressing flammability, offgassing and reactivity

Keywords: ISO 14624-7:2006, permeability, penetration, aerospace fluids, materials compatibility, space systems, permeability test, penetration test, protective clothing, ground support.