Re: What heat-resistant rubber could I buy?

Mark Thorson wrote:



Silicone is the elastomer with greatest temperature resistance.
There's an obscure elastomer called Sifel from Shin-Etsu which
also has high temperature resistance. It's a perfluorinated
carbon backbone with silicone end-groups. It's available
with curing mechanisms similar to silicone, such as A/B part
thermal cures.

First of all thanks for the answer. I did not know that silicon under
certain conditions is elastic. I have read through the Wikipedia entry for
silicon and found there that it is even used for bouncing balls; and one can
think of other examples. I imagine that a thin (quarter of a mm thick) layer
of the same kind of silicone would be easy to stretch.



Gold has about the least adhesion to anything.

Silicones and Sifel are not known for good adhesion,
but "adhesion packages" (principally silane coupling
agents) can greatly improve adhesion, but this is
adhesion which develops during cure. The best adhesion
is when the elastomer cures in contact with the metal.

A silicone caulk would have an adhesion package.
A clear caulk would be unfilled. I believe there are
silicone caulks sold for sealing the joints between
the panes of glass aquaria that might work for you.
Sifel is also available in formulations with good
adhesion, for example to attach lightbulbs to bases.

It is a suggestion on which I can work. With a little bit of ingenuity I
could figure out a way of obtaining a *** of material out of the caulk.
Also thanks for the warning about the outgassing. I was thinking of doing
the deposition on a sputtering system, which does not need high vacuum, but
I will check this carefully.



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