POM elevated temperature strengh values

[ballvalve1337]

Hello,

I need to design a valve. Seat material POM.
Operating temperature is 80°C (176°F). I need the yield strength or compression strength... at least any strengh value for calculating the surface pressure.
at elevated temperatures. I only find ambient temp. values.

Anybody knows where to find that information?

THANKS!

 

[rickfischer51]

Does anybody on this site know how to do an internet search?

http://www2.dupont.com/Plastics/en_US/assets/downloads/design/DELDGe.pdf

https://www.eldonjames.com/wp-content/uploads/2017/02/TDS_CelconM90.pdf

Rick Fischer
Principal Engineer
Argonne National Laboratory

 

[ballvalve1337]

Thank you Rick!
I am sorry... i used google but was not able to find something like that except

http://www.hirosugi.jptechnicalmaterialPOM.html

that page. Wasn't sure if its correct...

Unfortunately Eldon James only has values up to 70°C (160°F)for POM-C.

 

[rickfischer51]

Fit an Arrhenius curve to the three values listed and extrapolate it. That should be fairly accurate as long as you don't cross a transition temp, which you shouldn't be doing anyway if you want the seat to perform properly.

Rick Fischer
Principal Engineer
Argonne National Laboratory