Exxon HyJet IV-A plus

Exxon HyJet IV-Aplus is a fire-resistant phosphate ester hydraulic fluid designed for use in commercial aircraft. It is the best-performing Type IV fluid and offers to a great extent many of the performance capabilities of Type V fluids, including high temperature stability fluid llife, low density, and rust protection. It is superior to all other Type IV fluids in these respects. Exxon HyJet IV-A plus meets the specifications of all major aircraft manufacturers and SAE AS1241.

Click here for the Hyjet IV Product Data Sheet

Features and Benefits

Exxon HyJet IV-A plus offers the following key features and benefits:

Features	Advantages and Potential Benefits
Best in high temperature stability among Type IV fluids	Longer fluid life Lesser need to replace fluid due to degradation Reduced hydraulic system maintenance costs
Lowest density Type IV fluid	Reduced weight of the hydraulic fluid carried by aircraft Reduced aircraft fuel consumption, lower operating costs
Effective rust protection	Reduced the risk of equipment damage in the event of major water contamination
Excellent low temperature flow (viscosity) properties	Precise hydraulic system control and response even during extended range/polar flights Longer equipment life
Excellent deposit control	Longer equipment life Reduced maintenance costs
Excellent protection against electro-chemical corrosion (erosion)	Protection against servo valve and pump damage
Approved by all major aircraft manufacturers	Use as fleet lubricant by airline operators
Fully compatible with all approved phosphate ester hydraulic fluids	Flexibility in use by airline operators

Applications

Exxon HyJet IV-A plus fire-resistant aviation hydraulic fluid is used in commercial aircraft hydraulic systems where phosphate hydraulic fluids are recommended. Exxon HyJet IV-A plus meets or exceeds the following industry and builder specifications. It is approved against the aircraft manufacturer requirements and is included in their Qualified Products Lists.

Features	Advantages and Potential Benefits
Best in high temperature stability among Type IV fluids	Longer fluid life Lesser need to replace fluid due to degradation Reduced hydraulic system maintenance costs
Lowest density Type IV fluid	Reduced weight of the hydraulic fluid carried by aircraft Reduced aircraft fuel consumption, lower operating costs
Effective rust protection	Reduced the risk of equipment damage in the event of major water contamination
Excellent low temperature flow (viscosity) properties	Precise hydraulic system control and response even during extended range/polar flights Longer equipment life
Excellent deposit control	Longer equipment life Reduced maintenance costs
Excellent protection against electro-chemical corrosion (erosion)	Protection against servo valve and pump damage
Approved by all major aircraft manufacturers	Use as fleet lubricant by airline operators
Fully compatible with all approved phosphate ester hydraulic fluids	Flexibility in use by airline operators

HyJet IV-A plus	Meets Type IV, Low density	Is in Qualified Products List
SAE Aerospace Standard AS1241C	X	Not Applicable
Airbus NSA307110M	X	X
ATR	X	X
Boeing BMS 3-11N, Type IV, Class I and Type V, Grade B	X	X
Boeing (Douglas Division) DMS 2014H	X	X
British Aerospace (Avro) BAC.M.333C	X	X
Bombardier/Canadair BAMS 564-003NC	X	X
Bombardier/DeHavilland	X	X
Cessna	X	X
Embraer	X	X
Fokker	X	X
Gulfstream Aerospace 1159SCH302D	X	X
Lockheed C-34-1224C	X	X

	Test Method	HyJet IV-A plus (1)	Limits
Kinematic Viscosity, cSt	ASTM D 445
at -53.9ºC (-65ºF)		1320	2000 max
at 37.8ºC (100ºF)		10.6	10.0 -11.0
at 98.9ºC (210ºF)		3.6	3.35 - 3.75
Viscosity Index	ASTM D 2270	280
Shear Stability, % Viscosity Drop at 40ºC	ASTM D 5621	22
Pour Point, ºC (ºF)	ASTM D 97	‹-62 (-80)	-62 (-80) max
Specific gravity at 25ºC/25ºC (77ºF/77ºF)	ASTM D 4052	0.996	0.993 -1.005
Density at 15.6ºC (60ºF), g/mL (lb/gal)	ASTM D 4052	0.999 (8.34)
Acid Number, mg KOH/g	ASTM D 974	0.03	0.1 max
Water, Karl Fischer, mass %	ASTM D 6304	0.08	0.2 max
Flammability
Flash Point, ºC (ºF)	ASTM D 92	175 (347)	160 (320) min
Fire Point, ºC (ºF)	ASTM D 92	189 (373)	177 (350) min
Autoignition Point, ºC (ºF)	ASTM D 2155	›427 (800)	400 (752) min
Foaming Tendency/Stability, mL foam/sec to collapse	ASTM D 892
Sequence I		20/18	100/100 max
Sequence II		20/5	75/50 max
Sequence III		23/13	100/250 max
Particle count, NAS 1638 Class	Auto Counter	4	7 max
Chemical Elements, ppm
Calcium		102	120 max
Potassium		38	48 max
Chlorine		7	50 max
Sodium		1	15 max
Sulfur		220	350 max
Electrical Conductivity at 20ºC, microSiemens/cm		1.4	0.5 min
Bulk Modulus, Isothermal secant at 100ºF/3000 psi, psi		210,000
Thermal Conductivity at 40ºC, cal/sec/cm2/ºC (Btu/hr/ft2/ºF)		33x10^-5 (0.0799)
Coefficient of thermal expansion, 25 to 100ºC, per ºC (per ºF)		0.00086 (0.00048)
Specific heat capacity at 40 ºC, cal/g/ºC (same as Btu/lb/ºF)		0.41
(1) Values may vary within modest ranges