Description:
Hydraunycoil FH 42 is a synthetic hydraulic fluid formulated with PAO and esters, featuring a viscosity of 7 cSt at 40°C. It is engineered to function effectively within a temperature range of -54°C to +200°C, maintaining stability without significant evaporation or viscosity changes. This fluid is suitable for use in aircraft and missile hydraulic systems, offering protection against component wear and seizure.

Applications:
The fluid is applicable in various aerospace systems, including actuators and flap-control mechanisms, landing gear shock struts, helicopter and military hydraulic systems, and missile hydraulic servo-controlled systems.

Specifications and Characteristics:

• Density at 20°C: 0.834 (ASTM D4052)
• Appearance: Limpid red oil
• Kinematic Viscosity: At 40°C: 6.75 mm²/s, At -54°C: 2286 mm²/s (ASTM D445)
• Low Temperature Stability: Passes at -54°C without gelling or separation (FED-STD-791-3458)
• Flash Point: 172°C (ASTM D92)
• Fire Point: 188°C (ASTM D92)
• Auto-ignition Temperature: 345°C (ASTM E659)
• Pour Point: -69°C (ASTM D97)
• Total Acid Number: 0.03 mg KOH/g (ASTM D664)
• Evaporation Loss: 10.0% at 135°C (ASTM D972)
• Foaming Test: 25/0 cm³/cm³ at 24°C (ASTM D892)
• Steel on Steel Wear: Scar diameter after 1h at 392 N: 0.53 mm (ASTM D4172)
• Solid Particles Content: Various size ranges with maximum limits (SAE AS4059)
• Elastomer NBR-L Compatibility: 22% volume change at 70°C (ASTM D4289)
• Water Content: 57 mg/kg (ASTM D6304)

Notes:
The values provided are typical and do not constitute a contractual commitment. Sales specifications are available upon request. This technical data sheet supersedes previous editions.