This fire-resistant phosphate ester hydraulic fluid, designed for use in commercial aircraft, is the best-performing Type IV fluid that offers many of the performance capabilities of Type V fluids, including high temperature stability, low density, and rust protection. It is superior to all other Type IV fluids in these respects. Exxon HyJet IV-Aplus meets the specifications of all major aircraft manufacturers and SAE AS1241. For use in commercial aircraft hydraulic systems where phosphate hydraulic fluids are recommended. |
SpecificationsExxon HyJet IV-Aplus meets or exceeds the following industry and builder specifications for Type IV, low density fluid: - SAE Aerospace Standard AS1241
- Airbus NSA307110
- ATR
- Boeing BMS 3-11M, Type IV, Class I and Type V, X Grade B
- Boeing (Douglas Division) DMS 2014
- British Aerospace (Avro) BAC.M.333C
- Bombardier/Canadair BAMS 564-003
- Bombardier/DeHavilland
- Cessna
- Embraer
- Fokker
- Gulfstream Aerospace 1159SCH302D
- Lockheed C-34-1224C
| Typical Properties |
Test Method |
HyJet IV-A Plus |
Limits |
Kinematic Viscosity, cSt @ 53.9°C (-65°F) @ 37.8°C (100°F) @ 98.9°C (210°F) |
ASTM D 445 |
1320 10.55 3.57 |
2000 max 10.0-11.0 3.35-3.75 |
| Viscosity Index |
ASTM D 2270 |
320 |
|
| Shear Stability, % Viscosity Drop at 40°C |
ASTM D 5621 |
22 |
|
| Pour Point, °C (°F) |
ASTM D 97 |
< -62 (-80) |
-62 (-80) max. |
| Specific gravity at 25°C/25°C (77°F/77°F) |
ASTM D 4025 |
0.996 |
0.993-1.005 |
| Density @ 15.6°C (60°F), g/mL (lb/gal) |
ASTM D 4025 |
1.001 (8.35) |
|
| Acid Number, mg KOH/g |
ASTM D 974 |
0.04 |
0.1 max |
| Water, Karl Fischer, mass % |
ASTM D 6304 |
0.1 |
0.2 max. |
| Flash Point, °C (°F) |
ASTM D 92 |
174 (346) |
160 (320) min. |
| Fire Point, °C (°F) |
ASTM D 92 |
185 (365) |
177 (350) min. |
| Autoignition Point, °C (°F) |
ASTM D 2155 |
>427 (800) |
400 (752) min. |
Foaming Tendency/Stability, mL foam/sec to collapse Sequence I Sequence II Sequence III |
ASM D 892 |
0/0 0/0 0/0 |
100/100 max. 75/50 max. 100/250 max. |
| Particle Count, NAS 1638 Class |
Autocounter |
4 |
7 max. |
Chemical Elements, ppm Calcium Potassium Chlorine Sodium Sulfur |
|
110 37 7 0 220 |
120 max. 48 max. 50 max. 15 max. 350 max. |
| Electric Conductivity at 20°C, microSiemens/cm |
|
1.4 |
0.5 min. |
| Bulk Modulus, Isothermal secant at 100°F/3000 psi |
|
210,000 |
|
| Thermal Conductivity at 40°C, cal/sec/cm2/°C (Btu/hr/ft2/°F) |
|
33x10-5 (0.0799) |
|
| Coefficient of Thermal Expansion, 25-100°C, per °C (per °F) |
|
0.00086 (0.00048) |
|
| Specific Heat Capacity at 40°C, cal/g/°C (same as BTU/lb/°F) |
|
0.41 |
|
|
|