Aeroquip advanced technology designed, tested and proved a revolutionary new high pressure Teflon hose. Using the most modern methods of wire braiding calculations and hose stress analysis, Aeroquip engineering developed the AE246 Teflon hose with Hi-Pat braiding. This single wire braid contains densely packed small diameter wires braided over a minimum thickness Teflon tube in such a way that exceptional performance is possible. This hose exceeds all requirements of MIL-H-38360 and has been tested successfully at 4000 psi for up to 600,000 cycles at 400°F. AE246 Hose is now available to the aerospace industry with Aeroquip’s full recommendation for normal 3000 psi hydraulic systems and selected 4000 psi hydraulic systems with impulse peaks up to 5000 psi.

AE246 Hose is 40 to 50% lighter in weight than previous high pressure Teflon hose. It also has a much smaller envelope, is visibly smaller in diameter, and has excellent flexing and bend radius characteristics. Aeroquip Teflon hose has low volumetric expansion, assuring maximum response efficiency in ballistic election systems, brake systems, etc., where there can be no softness under shock load. Because the tube is smooth and homogeneous, it is able to withstand the high velocity, sudden pressure surges and temperature rises encountered in these systems.

The rate of effusion of gases and resistance to capillary leakage of fluid through the hose lines is controlled by a patented extrusion method used to produce Aeroquip Teflon hose liners. Inherent resiliency and toughness are built into the extruded tube by close control of factors affecting crystallinity. The extruded tube has a tough, smooth, wax like texture which resists erosion. No materials of a sticky or viscous nature will stick to its surface. It has essentially zero moisture absorption, and this, together with its chemical inertness and anti-adhesive characteristics, make it ideal for missile fluid systems where maintenance of a low dew point is necessary.

Shelf life: Service and shelf life of Aeroquip Teflon hose are unlimited for all practical purposes. However, experience has shown that service life on impulsing applications may eventually be limited by fatigue in the wire reinforcement. Maximum service life on such applications is best determined by the operator based on experience.

Testing Procedures: AE246 Hose was thoroughly tested to meet or exceed the requirements of MIL-H 38360A (Amendment 1 for conductive hose). Tests were conducted at 4000 psi with 5000 psi surge peaks. Two varying levels of vibration were applied at one end while the other end was flexed for 300,000 cycles. Then the ends were reversed and the procedure repeated. Temperatures varied from room temperature to +4OO°F. The hose was also tested and met the requirements of all other conditions prescribed in this specification including aging tests and salt corrosion testing.

Conductivity: AE246 Hose has a Teflon tube which is designed to eliminate electrostatically induced hose failures. The tube is capable of conducting a direct current equal to or greater than 6 micro-amps in sizes -4, -6 and -8; while in size -10 and -12 it will conduct a direct current equal to or greater than 12 micro-amps with a potential of 1,000 volts. AE246 Hose consists of a thin wall Teflon inner tube and a Hi-Pat outer braid consisting of densely packed small diameter stainless steel wires braided in a uniform pattern.

Application: High pressure and high temperature service. Teflon hose is unaffected by fuels, lube oils, cool-ants or solvents commonly used in aircraft applications. Superior vibration resistance, low volumetric expansion and high temperature resistance makes it ideal for hydraulic systems.

Operating temperatures: -67°F. to +400°F, fluid and ambient.

High Pressure Teflon Hose with Braided Polyester Chafe Guard (AE546)

This is AE246 with a blue polyester braided chafe guard, which provides superior chafe resistance and the flexibility of the hose is not impaired, it adds minimal weight and only increases the hose OD by 0.100” for all sizes. The hose is compatible with the fluids: LD4, Highjet Chevron, Skydrol 500B4, JP-4 (MIL-T-5624), AvGass Grade 100/130 (MIL-C-5572), MIL-L-7808 Lube Oil, Varsol (Cleaning Solvent).

Operating Temperatures: -65F to +300F

High Pressure Teflon Hose with Integral Silicone Fire Sleeve (AE446)

This is AE246 hose with an integral silicone fire protection, which is applied directly onto the hoses metal braid and end fittings to form a smooth, tight bond. This hose/fire protection cover is non-age sensitive for extra-long service life and does not impair the flexibility of the hose (same minimum bend radius as AE246) while providing an excellent chafe resistance.

AE246 meets the fire test requirements of TSO-C53a Type D and TSO-C75 Type III A and III B.

Operating Temperatures: -65F to +450F

Common end fittings available from stock:
Thread type: Flared (MS33656), Flareless (MS33514), BSP
Thread size: -3 to -12
Fitting style: Straight, 45 deg, 90 deg
Material: Cres
Other options: Jump Size, Male thread, Lock wire holes

Click here to download Eaton's engineering bulletin AA8 (reusable end fittings)
Click here to download Eaton's engineering bulletin AEB209A (crimp end fittings)