[R-390] Metallized Polyster vs Metallized Polypropolene

[Barry]

Can someone tell me which type of cap is preferred for applications in the
R390A?  Are there significant differences which would lend one better for
these RF applications than the others?  I have found both types with axial
leads and am wondering which one to use.  I think the ODs I have used before
were polypropolene.

Any comments?

Thanks,

Barry(III) - N4BUQ