Orings and compatibility

[Alky V6]

I've started testing some different rubbers found in automatic transmissions to try to further my knowledge of orings.

I will be soaking different rubbers in different fluids to see how they react. The fluids will be;
Methanol
Water
Gasoline
Mineral spirits
Acetone

The types of elastomers I'm starting out with are;
Nitrile (Buna-N)
Viton
Silicone
Teflon

So far I have Nitrile and Viton pieces cut to certain lengths soaking in methanol. Diameters, lengths and firmness are noted before they are placed in an airtight jar filled with the test fluid. After just one day the changes to the elastomers have been pretty dramatic. I'll post the results of the first test tomorrow.

Check out this site. O-rings, seals in Viton, Kalrez, nitrile, other elastomers.

 

[PhilM]

You can just look at chemical suppliers compatibility charts.

 

[Alky V6]

Yeah, I know. Nothing beats seeing it in person though.

I just hope there's something left of the nitrile when I get into work tomorrow.

 

[PhilM]

Didn't see EPDM on your list... EPDM is great for many alkys

 

[GNVYUS 1]

Just had this issue come up on my Talons fuel rail, kept ripping and cracking the supplied O rings and Napa O rings on the fittings.

Went to the Aerospace Buna-N O ring ( much firmer ) and have yet to see any leaking gas.

 

[salvageV6]

There's also various grades within each category of material.

Sometimes it's noted sometimes not.

I like to narrow choices down on the internet with research, then you can't beat the good old experimentation method as shown by what Don's doing.

There's also different tests for static and dynamic seal types just to make things more confusing.

 

[Alky V6]

Well, my old fashion testing brought up more questions than answers. I'll put up some results tomorrow. Wierd stuff.

You're so very right about the different grades within a seal material type.

Probably the best thing I've learned from simple testing and internet research is, consult a manufacturer and give them detailed specifications of your intended use so they can give you the best material.

 

[XxDarkSidexX]

Well, my old fashion testing brought up more questions than answers. I'll put up some results tomorrow. Wierd stuff.

You're so very right about the different grades within a seal material type.

Probably the best thing I've learned from simple testing and internet research is, consult a manufacturer and give them detailed specifications of your intended use so they can give you the best material.

Man Don, you have to move to OC, and come experiment where I can watch Thanks for once again, attempting to contribute and experiment with the TB community online. Cant wait to read up on some findings. Your the man!

darkside