BS ISO 9938. Aerospace. Polytetrafluoroethylene (PTFE) hose assemblies, classification 204 °C/28 000 kPa. Procurement specification|Vacuum techniques, Aircraft components, Flexible pipes, Resistance measurement, Polytetrafluoroethylene, Aviation fuels, Salt-spray tests, Quality assurance systems, Thermoplastic polymers, Pressure testing, Qualification approval, Pipes, Lubricating oils, Leak tests, Test equipment, Corrosion-resistant steels, Dimensions, Chemical-resistance tests, Reinforcing steels, Reinforced materials, Design, Performance testing, Performance, High temperatures