Re: sylgard 184
- From: "Ron Jones" <ron@xxxxxxxxxxxxxxx>
- Date: Thu, 6 Jul 2006 23:45:26 +0100
z wrote:
hi. i recently ordered a sample from dow corning of sylgard 184.it was
an kit. they had forgotten to send with it the applicator, a kind of
gun to push out the sylgard, from its seperate containers in to the
nozzle type attachment where the curing agent and base would properly
mix and would be ready for our use. we called them and asked when was
the soonest we could recieve the applicator. their reply was next
week. we needed to use the sylgard 184 right away for an experiment.
so we carefully opened each container and placed them in seperate
containers, such as plastic and glass jars.
today when we went back to check, the base and the curing agent were
still in their seperate containers, and at room temperature. wehen we
tried to pour them out we found that they had already sort of cured.
the base in the glass container was completely molded. the base in the
plastic container was extremely sticky, and almost reminded me of
"flubber" (the movie) the curing agent was placed in another glass
container, and it had begun to harden as well, but just at the bottom,
the rest of it was still liquid and rested on the rest which was
already like a mold of the container itself.
my question is, what could have caused this?
i asked the professor whom i wourk with, his respond was that it was
quite possible that the container it originally came was probably
coated with a chemical to prevent this from happening, that when we
poured it out, it was also possible that it had cured cause of the
oxidation that might have taken place.
i called the dow corning, 1 989 496 5900, and they forwaded me to
customer service, and when i presented them with this, they did not
have much of a response, said they dont know what could have caused
this,..
is it a possible side effect from exposure tot the glass or plastic,
or is it some sort of aging process?
if any one can help, please do..
I would guess it's a reaction with the air - either the oxygen or water
vapour. I would also guess (as its from Dow Corning) that it's a silicone
compound - a lot of these are set by traces of moisture.
--
Ron Jones
Process Safety & Development Specialist
Don't repeat history, unreported chemical lab/plant near missesa at
http://www.crhf.org.uk Only two things are certain: The universe and
human stupidity; and I'm not certain about the universe. ~ Albert
Einstein
.
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