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Technical Data Sheet
Eastman™ HALO 157

  • Aviation turbine oil (ATO)
  • Helicopter oil
Key Attributes
  • A purpose designed lubricant with a viscosity of 9 cSt @ 100ºC and 12,700 cSt @ -32ºC
  • Excellent load carrying and antiwear performance
  • Excellent shear stability
  • Good corrosion resistance
  • Good elastomer compatibility
  • Greater inter-gear film thickness
  • High temperature stability

Product Description

For many years MIL-PRF-23699 approved engine lubricants were employed in helicopter gearboxes, ensuring a common lubricant for both engines and transmission systems. More recently, high-load-carrying oils have been evaluated and found to offer advantages over conventional-load-carrying MIL-PRF-23699 oils. These higher-load-carrying oils, complying with specification DOD-PRF-85734, were originally intended only for engine applications. The two MIL spec oils are thus of identical viscometric properties. Operators considered that lubrication performance of gearboxes could be enhanced by a higher-viscosity, high-load-carrying lubricant possessing improved corrosion-protective qualities.

Eastman HALO 157™ is a clear, amber-colored fluid with a faintly aromatic odor reminiscent of turbine engine oils. It is based on selected polyol esters, the inherent characteristics of which are enhanced by additives. It is also fully compatible and miscible with other oils approved to specifications MIL-PRF-23699 and MIL-PRF-7808.

Multiple tests have been completed in bearing and gearbox rigs and flight evaluations, culminating in the NATO standard (AIR STANDARD ACS 4035) for a 9-cSt advanced helicopter gearbox lubricant.

Typical Properties

PropertyTest MethodTypical Value, Units
     @ 15°CASTM D 12980.986 kg/L
Viscosity, Kinematic 
     @ 100°CASTM D 4458.92 mm2/s
     @ -32°CASTM D 44512700 mm2/s
     @ 40°CASTM D 44552.8 mm2/s
Total Acid NumberSAE ARP50881.15 mg KOH/g
Pour PointASTM D 97-51 °C
Flash PointASTM D92263 °C
Evaporation Loss 
     6.5 hrs @ 205°CASTM D 9722.3%
Rubber (Nitrile) Compatibility 
     AMS 3217/1, 72 hr @ 70°C, % SwellFED-STD-791, 36047.1%
Rubber (Fluorocarbon) Compatibility 
     AMS 3217/4, 72 hr @ 205°C, % SwellFED-STD-791, 36045.9%
Corrosion & Oxidation Stability @ 175°C, 72 hrs 
     Aluminium Weight ChangeFED-STD-791, 5308-0.01 mg/cm2
     Copper Weight ChangeFED-STD-791, 5308-0.04 mg/cm2
     Magnesium Weight ChangeFED-STD-791, 5308-0.01 mg/cm2
     Silver Weight ChangeFED-STD-791, 5308-0.03 mg/cm2
     Sludge, 10 micron filterFED-STD-791, 53080 mg / 100 ml
     Steel Weight ChangeFED-STD-791, 5308-0.01 mg/cm2
     Total Acid Number ChangeFED-STD-791, 53080.28 mg KOH/g
     Viscosity @ 40°CFED-STD-791, 53087.5%
Air Release Value 
     @ 50°CASTM D 34172.44 minutes
Corrosion Inhibition 
     Ball Corrosion TestSAE ARP4249Pass
Compatibility with MIL-PRF-23699 (all grades), MIL-PRF-7808 (all grades) & DOD-PRF-85734FED-STD-791, 3403Pass
Ryder Gear 
     @ 100°CFED-STD-791, 6508 (modified)205% of Calester A
FZG Load Carrying Capacity Test for Transmission Lubricants 
     A/16.6/90CEC Method L-07-A-09513/13+ Failure Load Stage

All product should be stored under cover. Where outside storage is unavoidable drums should be laid horizontally to avoid the possible ingress of water and the obliteration of drum markings. Products must not be stored above 60ºC, exposed to hot sun or freezing conditions.

Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

8/28/2018 3:24:54 PM