Re: carbon fiber reinforced plastic

john wrote:
>
> Yes, as an implant. My task is to protect the device completely from
> water or blood for a long period like months or years like protecting
> the crew people of submarine from sea water. Does lack of stress make
> this material improper to use in the RAT?

No, but there's no reason to use it either.
Carbon fiber is a reinforcing filler, not the
polymer matrix. You could add carbon fiber
to just about any polymer, but it would only
make sense when the resulting material is
subject to high stress.
>
> Some people do adviced me that silicone and other traditional material
> used in the implanatable field do not last long like for months or
> years. I am more concern with the leaking of the water into the
> electronic device. Does this material provide excellect protection
> against water or blood. Does it corrode with time?
> Please advice and be patient with me.

A properly designed silicone material will
last for years. It is very inert, and will
not degrade. That is why it is used for
implants.

Silicone does not have high strength, but
if it's not being stretched, crushed, or
abraded, that might not matter. There are
other reinforcing fillers which can be used
to increase the strength of a silicone
material. Silica is most commonly used.

You could consult a patent database for
examples of encapsulants used for implants.

Here's the search page for U.S. patents:

http://patft.uspto.gov/netahtml/search-adv.htm

Try searching for:

spec/"biocompatible polymer"

That will get 1482 hits.
.

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