The core advantages of PTFE tubing for aerospace applications include extreme temperature resistance (-65℃ to 260℃), chemical inertness, low outgassing, lightweight properties, high electrical insulation and flame retardancy. It is mainly applied in four major scenarios: fuel, hydraulic fluid and propellant delivery, environmental control & cooling, cable protection, as well as aerospace vacuum and low-orbit systems. The commonly used types are stainless steel braided reinforced PTFE tubing, conductive/anti-static PTFE tubing, and thin-walled lightweight PTFE tubing.
I. Civil Aviation (Airliners & Cargo Aircraft, Airworthiness Certification Prioritized)
1. Fuel System (Core Safety Component, Standard: MIL-PRF-87937 / SAE AS22759)
JP-8 / Jet A-1 Aviation Kerosene Delivery Tubing: The inner PTFE layer prevents permeation. It withstands temperatures from -55℃ to 180℃ and resists fuel additives for anti-icing and anti-corrosion purposes. Its permeability is lower than 10⁻⁶ g/cm²·s, far superior to rubber tubing. The outer layer adopts 304/316 stainless steel braid, with a working pressure of 21 MPa and excellent vibration fatigue resistance for up to 1 million pressure cycles.
Fuel Tank Vent & Return Tubing: Resists oil mist and features anti-static performance via carbon black modification, eliminating static accumulation that may ignite fuel.
Engine Fuel Injection Tubing: High-pressure reinforced type rated for an injection pressure of 140 MPa, suitable for high-temperature zones of CFM56 and LEAP series engines.
2. Hydraulic System (Flight Control & Landing Gear, 21 MPa Standard)
Main Hydraulic Tubing (Flagship Product): Consists of a PTFE inner tube and stainless steel braid. Compatible with MIL-H-5606 / MIL-H-83282 hydraulic fluids, with a swelling rate below 0.1%. Working pressure: 21 MPa; Burst pressure: ≥63 MPa; Operating temperature: -65℃ to 204℃. Compliant with ISO 9528 certification.
Landing Gear & Brake Hoses: High flexibility with a bend radius ≤ 3D and outstanding impact resistance, capable of withstanding severe vibration during takeoff and landing. Service interval: ≥50,000 operating hours.
Actuator & Flight Control Tubing: Low friction delivers rapid response and minimal hysteresis, improving control accuracy.
3. Environmental Control & Cooling (Cabin & Avionics Bay)
Air Conditioning & Bleed Air Hoses: Resists high-temperature air up to 180℃ and ozone aging. It is over 30% lighter than rubber tubing, effectively reducing aircraft load.
Avionics Cooling Tubing: Compatible with ethylene glycol coolant and features low ion elution to protect avionics and radar systems. Certified by NASA for low outgassing (TML < 1%, CVCM < 0.1%) to avoid contamination of optical components.
Anti-Icing System Tubing: Operates steadily from -40℃ to 120℃ and resists ethylene glycol corrosion, applied to anti-icing circuits for wings and empennages.
4. Cable Protection (High Temperature & Flame Retardant, Standard: AS22759)
High-Temperature Wiring Conduits for Engine Bays: Maintains stable performance at a continuous temperature of 260℃, meets UL 94 V-0 flame retardancy requirements, and resists oil and hydraulic fluid to prevent short circuits and fires.
Fuselage & Wing Cable Sleeves: Thin-walled PTFE tubing (0.1~0.3 mm wall thickness) provides high electrical insulation (≥5 kV/mm) and lightweight design, ideal for complex wiring layouts.
II. Military Aviation (Fighter Jets & Helicopters, Extreme Operating Conditions + Stealth Performance)
1. High-Temperature & High-Speed Fighter Jets (F-35, J-20)
Engine Hot Section Tubing: Withstands temperatures above 260℃ and flue gas corrosion, adapting to thermal shock during supersonic flight (temperature change: -65℃ to 200℃ per second).
Fuel & Hydraulic Tubing for Stealth Aircraft: PTFE features low radar reflectivity, paired with outer braided stealth coating to reduce Radar Cross Section (RCS). It is compatible with high-temperature JP-7 fuel (above 180℃).
Airborne Weapon Tubing: Impact resistant and immune to Electromagnetic Interference (EMI), suited for intense vibration and electromagnetic environments on missile pylons.
2. Helicopters (Rotor & Powertrain, Vibration Resistance)
Rotor Hydraulic Servo Tubing: High flexibility and resistance to torsional vibration, with a fatigue life of over 100,000 hours. Operates reliably with hydraulic fluid at -50℃ to 150℃.
Turboshaft Engine Oil Tubing: Resists oil mist and temperatures up to 180℃, designed for high-temperature powertrain bays of Apache and Z-10 helicopters.
III. Aerospace (Rockets, Satellites & Spacecraft, Vacuum + Cryogenic Temperature + Radiation Resistance)
1. Rocket Propellant System (Liquid Oxygen, Liquid Hydrogen, Hydrazine Fuels)
Liquid Oxygen (LOX) Delivery Tubing: Pure PTFE tubing remains non-brittle at cryogenic temperature of -183℃ and withstands liquid oxygen impact. Used for liquid oxygen / kerosene engines of Falcon 9 and Long March 5 rockets.
Liquid Hydrogen (LH₂) Tubing: Thin-walled PTFE reinforced with carbon fiber. It tolerates an ultra-low temperature of -253℃, prevents hydrogen embrittlement and reduces permeation, applicable to liquid hydrogen / liquid oxygen engines.
Hydrazine & Unsymmetrical Dimethylhydrazine (UDMH) Fuel Tubing: Excellent chemical inertness and strong corrosion resistance, with no chemical reaction with propellants to ensure launch safety.
2. Satellites & Spacecraft (Vacuum, Low Outgassing & Radiation Resistance)
Satellite Fuel & Propulsion Tubing: NASA low-outgassing certified. No volatile substances are released under vacuum (10⁻⁶ Pa) to avoid contaminating optical payloads. Works stably within orbital temperature range from -100℃ to 120℃.
Environmental Control & Life Support Tubing for Spacecraft: Non-toxic with low substance elution, compatible with high-pressure oxygen for manned cabins. Performance remains stable after exposure to cosmic radiation up to 100 kGy.
Solar Panel & Mechanism Sleeves: Low friction and self-lubricating, facilitating the deployment and retraction of solar panels. Maintenance-free with a service life of over 15 years.