Specific Heat of MIL-PRF-7808?????

[warrenelec]

Can't find this info anywhere? any help appreciated

Warren

 

[kenvlach]

I'm not familiar with ester-based synthetic lubricants, but can suggest a method for finding the answer;

Go to ASSIST (

http://assist1.daps.dla.mil/quicksearch/)

and download 2 documents:

MIL-PRF-7808L LUBRICATING OIL, AIRCRAFT TURBINE ENGINE, SYNTHETIC BASE
and
QPL-7808-38, the latest Qualified Product List for MIL-PRF-7808.

The QPL lists brand names & manufacturers. You should be able to find their websites & download the MSDS, which may give the heat capacity directly, or else you can add up those of the constituents.

And of course, the manufacturer's Customer/Technical support should be able to provide the info.

 

[1969grad]

Mobil Jet 254, Jet II, SHC 824
Shell Aeroshell 500
Exxon 2380
Akzo Fryquel GT

All of the above are typical synthetic oils used in gas turbines and I know for sure the last one is ester based.

Seems like I also had the same problem and could not find any published data so I had to call the manufacturer.

Be careful using an ester based oils as there are certain types of seal materials that cannot be used in valves, etc. with this type of oil. You also have to be careful not to used any copper based materials as I recall.

 

[aviat]

Exxon 2380 and AeroShell are to MIL-PRF-23699, but there may not be much difference. The following site contains specific for MIL-PRF-23699 oil on page 12.

http://www.airbp.com/airbp/public/lubes/data_files/25 - sept 2002 .pdf

 

[aviat]

On the last post it should read AeroShell 500 is to MIL-PRF-23699, while AeroShell 308 is to MIL-PRF-7808.