Hi Nick,

I've used Devcon 2-ton epoxy for potting on many occasions with pretty good
success.  However, at that temperature, you are right up at the design
limit for it:
http://www.devcon.com/devconcatsolution.cfm?catid=38

I have definitely had this stuff discolor at lower temps than 200F.

If you do decide to use hardware store stuff, make sure to check the spec
sheet.  And then I'd probably mix up a sample and put it in a drying oven
for a week to see how it does.

cheers,
mike

At 09:56 AM 7/9/2004, James Nick Sears wrote:
>Hello,
>
>I am making temperature sensors with an IC sensor enclosed in a 6 foot
>piece of 1/2" diameter stainless steel pipe.  I need an epoxy to fill
>the pipe to protect the sensor, displace moisture, etc.  I have been
>checking prices on potting epoxies and it seems they are considerably
>more expensive and difficult to locate than the standard hobby shop
>variety, especially when only needing approximately 1/2 gallon.  I am
>looking for opinions on whether I should go for the potting epoxy for an
>application like this or whether the standard variety epoxy would
>suffice.  The sensors will spend long periods of time (months to years)
>at temperatures of approximately 200 degF.  Thanks for any ideas.
>
>Nick
>
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