no abrasion in this situation, static.

mind you, in the past I have used silicon o rings in rotating seal
assemblies, seals that saw 121 C, I bar pressure, pH from 2.7 to 8.5.
worked pretty well.

alistair

On 9-May-10, at 9:18 PM, Tom Hargrave wrote:

Regarding O-rings. Silicone will withstand greater temperature range but
buna has better abrasion resistance - it wears better.

Tom
www.stir-plate.com