1. Basic Parameters & Standards

• Composition & Standards:
  Formulated with refined petroleum distillates as the base oil, blended with polyester additives, antioxidants, anti-wear agents, antifoam agents, and Sudan Red (specific additive), presenting as a red transparent liquid. Complies with Chinese Military Standard GJB 1177A-2013 and U.S. Military Standard MIL-H-5606E, featuring independent intellectual property rights.

• Temperature Range:

• Operating Range: -55°C to 135°C (short-term tolerance up to 150°C). Exceptional low-temperature performance: pour point ≤-70°C; kinematic viscosity ≤2500 mm²/s at -54°C, ensuring smooth cold starts.

• High-Temperature Stability: Oxidation stability >30 hours at 100°C; flash point ≥104°C; evaporation loss ≤8.72% (71°C test), maintaining viscosity stability under heat.

2. Core Performance Features

• Viscosity-Temperature & Lubricity:

• High viscosity index: 13.84 mm²/s at 40°C, ensuring stable flow across wide temperatures and reducing hydraulic system friction (four-ball wear diameter: 0.45 mm).

• Extreme pressure (EP) additives provide PB value ≥600N in four-ball tests, ideal for high-load friction applications.

• Contamination Resistance & Cleanliness:

• Strict particle contamination control, surpassing cleanliness of older hydraulic fluids (e.g., No. 10), meeting requirements for precision aviation systems (e.g., flight control systems).

• Copper strip corrosion rating: 1a; rubber swelling rate ≤5%, protecting seals and metal components.

• Fire Safety:

• Flame-retardant formulation delays fire spread, complying with aviation safety standards.

• Environmental Adaptability:

• Excellent water resistance (total water content ≤0.05%); air release time ≤3 minutes, preventing foam and cavitation.

3. Applications

• Aviation:

• Aircraft hydraulic systems (landing gear, flap control systems), sealed ball bearings, and precision instruments.

• Replaces older domestic fluids (No. 10/12) and MIL-H-5606E fluids, compatible with Boeing, Airbus, and other aircraft.

• Industrial & Special Equipment:

• High-altitude/extreme-cold machinery, shipboard hydraulic systems, and laboratory setups.

• Ground equipment: Heavy-duty truck braking systems, precision machine tool hydraulics.

4. Key Technical Indicators

5. Usage & Maintenance Guidelines

• Storage & Transport:

• Store sealed in dry, ventilated areas (10°C–25°C); avoid sunlight. Shelf life: 3 years. Follow SH0164 regulations for transport.

• Application:

• Clean systems thoroughly before refilling; use dedicated tools to avoid contamination. Do not mix with other fluids (mineral/synthetic).

• Annual fluid replacement recommended (shorter cycles under extreme conditions); replace filters and clean magnets.

6. Market Positioning & Comparisons

• Advantages:

• Superior to MIL-H-5606E fluids: Better contamination control, lower pour point (-70°C vs. -60°C), and 60-70% cost of imports.

• Outperforms older domestic fluids: 50% higher oxidation stability, service life >2000 hours.

• Limitations:

• Temperature ceiling (150°C) lower than full-synthetic fluids (e.g., Shell AeroShell Fluid 41, 200°C). Monitor performance degradation in high-heat conditions.

7. Technological Trends

• Synthetic Upgrades:
  Potential shift to PAO or ester-based synthetics for higher temperature tolerance (target: 200°C continuous operation).

• Eco-Friendly Development:
  Reduce sulfur/phosphorus additives; develop biodegradable formulas to meet international regulations (e.g., ICAO CORSIA).

8. Conclusion & Selection Guidance

Kunlun No. 15 Aviation Hydraulic Fluid is a benchmark product for domestic high-performance hydraulic fluids, ideal for:

• Precision aviation systems requiring cleanliness and broad temperature adaptability.

• Extreme environments (high-altitude, polar regions).

• Cost-sensitive scenarios (replacing imports while reducing maintenance costs).

Not Recommended For:

• Ultra-high temperatures (>150°C) or prolonged heavy-load operations (use synthetic fluids).

• Strong acid/alkali environments (custom corrosion-resistant formulas required).

Balancing technical excellence and market needs, Kunlun No. 15 exemplifies China’s advancements in high-performance hydraulic fluid technology.