Product Overview
Eastman Turbo Oil 25™ is a high load-carrying gas turbine oil, for the most demanding gear applications. Helicopter operators in both military and private sectors have shown a preference for the DOD-PRF-85734 oils, like Turbo Oil 25, because of the wear protection provided by its extreme pressure additive technology. Eastman is the only oil manufacturer to offer broadly used DOD-PRF-85734 and MIL-PRF-23699 HTS Class oils, to suit all your helicopter oil lubrication needs. Turbo Oil 25 is formulated from synthetic base stocks and advanced technology additives, to provide the combined thermal and oxidation stability properties of commercial Type II lubricants, with extreme pressure additives to maximise gear system reliability. Turbo Oil 25 is a DOD-PRF-85734, 5 cSt viscosity class oil, plus extreme pressure additives, for the demanding loads of helicopter gearboxes. Fluids ApplicationsAerospaceAviation turbine oil (ato)Helicopter oilKey Attributes5 cSt load carying synthetic lubricantType II oil in helicopter gear box and transmissionTypical PropertiesPropertyTest MethodTypical Value, UnitsGeneralDensity @ 15°CASTM D 12980.9950 kg/LViscosity, Kinematic @ 37.8°CASTM D 44527.2 mm2/s @ -40°C after 35 minutesASTM D 25328,990 mm2/s @ 98.9°CASTM D 4455.16 mm2/sPour PointASTM D 97-60 °CFlash PointASTM D92255 °CTotal Acid NumberASTM D 6640.38 mg KOH/gEvaporation Loss 6.5 hrs @ 204°CASTM D 9721.8 %Foaming Volume Sequence 1 @ 24°CASTM D 8925/0.05 ml/vol Sequence 2 @ 93 °CASTM D 8925/0.03 ml/vol Sequence 3 @ 24°CASTM D 8925/0.08 ml/volRyder Gear Av. Rel. ratingFED 6508167 % reference oil No. of determinationsFED 65082 Ref. Oil, av. RatingFED 65082,400 lbs/inElastomer Compatibility F Rubber Swell (72 hrs @ 204°C)FED-STD-791, 3604.1414 % H Rubber Swell (72 hrs @ 70°C)FED-STD-791, 3604.1414 % Silicone Rubber tensile strength lossFED-STD-791, 3433 57.657.6 %Corrosion & Oxidative Stabilitya Aluminium Weight LossASTM D 46360 mg/cm2 Copper weight LossASTM D 46360.05 mg/cm2 Iron Weight LossASTM D 46360 mg/cm2 Magnesium Weight LossASTM D 46360.08 mg/cm2 Silver Weight LossASTM D 4636-0.07 mg/cm2 SludgeASTM D 46360.1 mg/100ml Total Acid Number ChangeASTM D 46360.56 mg KOH/g Viscosity Change 38°CASTM D 463610.3 % Eastman Chemical Eastman Chemical Industrial Chemicals,Fluids and Lubricants Aviation
Key Attributes
Typical Technical Properties
Product-specific technical values. Confirm current specifications with the supplier before commercial use.
| Property | Typical value | Condition | Test method / source |
|---|---|---|---|
| Property | Test Method | Typical Value, Units | |
| @ 15°C | ASTM D 1298 | 0.9950 kg/L | |
| @ 37.8°C | ASTM D 445 | 27.2 mm2/s | |
| @ -40°C after 35 minutes | ASTM D 2532 | 8,990 mm2/s | |
| @ 98.9°C | ASTM D 445 | 5.16 mm2/s | |
| Pour Point | ASTM D 97 | -60 °C | |
| Flash Point | ASTM D92 | 255 °C | |
| Total Acid Number | ASTM D 664 | 0.38 mg KOH/g | |
| 6.5 hrs @ 204°C | ASTM D 972 | 1.8 % | |
| Sequence 1 @ 24°C | ASTM D 892 | 5/0.05 ml/vol | |
| Sequence 2 @ 93 °C | ASTM D 892 | 5/0.03 ml/vol | |
| Sequence 3 @ 24°C | ASTM D 892 | 5/0.08 ml/vol | |
| Av. Rel. rating | FED 6508 | 167 % reference oil | |
| No. of determinations | FED 6508 | 2 | |
| Ref. Oil, av. Rating | FED 6508 | 2,400 lbs/in | |
| F Rubber Swell (72 hrs @ 204°C) | FED-STD-791, 3604.14 | 14 % | |
| H Rubber Swell (72 hrs @ 70°C) | FED-STD-791, 3604.14 | 14 % | |
| Silicone Rubber tensile strength loss | FED-STD-791, 3433 57.6 | 57.6 % | |
| Aluminium Weight Loss | ASTM D 4636 | 0 mg/cm2 | |
| Copper weight Loss | ASTM D 4636 | 0.05 mg/cm2 | |
| Iron Weight Loss | ASTM D 4636 | 0 mg/cm2 | |
| Magnesium Weight Loss | ASTM D 4636 | 0.08 mg/cm2 | |
| Silver Weight Loss | ASTM D 4636 | -0.07 mg/cm2 | |
| Sludge | ASTM D 4636 | 0.1 mg/100ml | |
| Total Acid Number Change | ASTM D 4636 | 0.56 mg KOH/g | |
| Viscosity Change 38°C | ASTM D 4636 | 10.3 % |
Product Identity
| Chemical name | Fluids |
|---|
Applications
Application areas documented for this product grade.
Processing & Availability
- Additional product information
- General
- Additional product information
- Density
- Additional product information
- Viscosity, Kinematic
- Additional product information
- Evaporation Loss
- Additional product information
- Foaming Volume
- Additional product information
- Ryder Gear
- Additional product information
- Elastomer Compatibility
- Additional product information
- Corrosion & Oxidative Stabilitya
Technical Documents & Source References
No technical PDF is referenced in the source record for this product.