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A silicone gasket will maintain its shape, whereas the ptfe one will not. Therefore, selling one or the other is going to be an easy decision, because one of them is unlikely to need additional customer service.

I'm probably the exception in that I have a 4" ptfe gasket between my stainless steel boiler and my copper pot still riser. I have to put my gaskets through regular thermal cycling. Most people here probably only use ptfe gaskets in column stills that have a separate fill port, so they never have to take a hot gasket and place it somewhere appropriate while it cools.

Which is more dangerous
A PTFE gasket that's likely to leak alcohol vapor
Or having a food grade silicone O-ring touching the alcohol vapor.
PTFE coated silicon O-rings work the best but are expensive
I buy tri-clamps, ferules, and silicone O-rings, it's only logical to wrap the O-rings in ptfe tape.

I bet these are also pricey.
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Hi,

I do not understand why using PTFE Gasket is more dangerous, this site is recommending using them, for example in my case I use 2" sanitary PTFE Gaskets between the poles and purchased a sheet from eplastics and cut out a gasket out of it, why do you say constant thermal cycling is not good for these gaskets ?

In my small boiler unfortunately it leaks vapour during distilling, I am thinking to wrap some tape over the PTFE gasket maybe that makes it a little bit flexible. Is there another way to do this ?