Polypropylene and aviation oil

[piNion]

I just want to know if some polyprolylene beaker will not dissolve if I pour into it Mobil Jet oil II at ambient temperature.
I have oil specs but does not say anything about polypropylene, just some rubbers and silicone appear.

for oil specs:

http://www.exxonmobil.com/Canada-

English/Aviation/PDS/IOCAENAVIMOMobil_Jet_Oil_II.asp

I'd appreciate any help.

Saludos/Regards

 

[CoryPad]

I don't think you will have a problem with this. In what kind of container did it come? A plastic (polyethylen) bottle?

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[piNion]

Thanks Cory, I just wanted somebody else to confirm it.

 

[patprimmer]

It will not dissolve in Jet Oil 11, but given a considerable time of exposure, it may swell slightly, thereby making any graduations to indicate volume inaccurate

Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
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[piNion]

Hi Pat,

You got my attention because that's exactly what I wanted to use the beaker for, to measure volume...Oil will not stay in the beaker for a long time just the measure and that's it, but it will be several times: around every week or so, do yo think the beaker will swell significantly?

If that's the case, What kind of beaker do you recommend?

thanks in advanced.

Nelson

PS:we wash the beaker after use.

 

[patprimmer]

It depends on time of exposure and time to dry out between exposures, and the temperature, and a little on the grade of polypropylene used, and even a little on the moulding conditions, but the last two points are probably so insignificant as to be unmeasurable.

I don't have any hard data available to me now, but the suppliers of the polypropylene moulding compounds should be able to supply actual measured data.

You could calibrate your beaker once a week or so by comparing to a glass beaker, or by weighing the indicated volume. You might need to test the SG with a hydrometer, to correct the expected to variations in the Jet Oil 2. I am not familiar with the actual spec of Jet Oil, but I am presuming it is mainly allephthatic (sorry, I have a brain fade and forget how to spell it, and it's not in my spell checker) hydrocarbons with some aromatics as well.

Alternatives are metals like stainless steel or aluminium if high levels of accuracy are not required, or glass if accuracy is required, but durability is not so important

Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[gambro]

According to my chemical resistance table, PP has a good chemical resistance to most mineral oils, as long as they are mainly aliphatic (which is generally the case for mineral oils used in automobiles). If the oil contains significant amounts of aromatic compounds, this will lead to a certain degree of swelling. Please note that if the oil is warm (60°C), swelling will generally become worse.