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Science Forum Index » Materials Forum » What heat-resistant rubber could I buy?
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| John Travolta Sardus |
 Posted: Sat Feb 02, 2008 7:25 pm |
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Hi to all,
I am looking to buy a small sample of rubber for an experiment in our lab.
I would
like to deposit a thin film of metal on top of a piece of elastic rubber (I
can do the deposition in our labs) and subsequently do some experiment on
the deposited film, but I would need the rubber to be able to resist to a
temperature of around 80 C during the deposition process and then recover
its
elastic properties (I would like to be able to stretch it by hand) when it
is returned to room temperature; and I do not
know which rubber to choose. I am hoping that I could receive a hint on a
rubber with these
characteristic. I believe that metals like gold would easily stick to any
rubber during the deposition process in our sputtering deposition system (is
that true?).
G. |
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| Mark Thorson |
| Posted: Sun Feb 03, 2008 12:14 am |
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John Travolta Sardus wrote:
Quote:
is returned to room temperature; and I do not
know which rubber to choose. I am hoping that I could receive
a hint on a rubber with these
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.
Quote: characteristic. I believe that metals like gold would easily
stick to any rubber during the deposition process in our
sputtering deposition system (is that true?).
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.
Silicones are well-known for out-gassing low
molecular weight oligomers which can contaminate
vacuum systems. They can leave films which further
contaminate anything that subsequently goes through
the vacuum system. This surface contamination can
adversely affect electrical contacts, adhesive
bonds, thermosonic welds, etc. Don't say you
weren't warned! |
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| John Travolta Sardus |
| Posted: Mon Feb 04, 2008 8:11 pm |
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Mark Thorson wrote:
Quote:
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.
Quote:
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 sheet 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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