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low ionics epoxy
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ratman
science forum beginner


Joined: 16 Jun 2006
Posts: 3

PostPosted: Tue Jul 11, 2006 12:54 am    Post subject: low ionics epoxy Reply with quote

I need to glue some parts (gold etc) in an amperometric cell.
Anyone know of good low ionics epoxies? Or are there better adhesives
for this?
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Mark Thorson
science forum Guru Wannabe


Joined: 04 May 2005
Posts: 102

PostPosted: Tue Jul 11, 2006 7:57 pm    Post subject: Re: low ionics epoxy Reply with quote

ratman wrote:
Quote:

I need to glue some parts (gold etc) in an amperometric cell.
Anyone know of good low ionics epoxies? Or are there better adhesives
for this?

Epoxies made for semiconductor packaging must be low-ionic,
so they don't attack the aluminum bond pads. Search for
"glob top" epoxies.

Many silicones are inherently low in ionics. However,
if they contain mineral fillers, they won't be low-ionic.
Some glob-top encapsulants are made from silicone.

The only other adhesive family commonly used for
semiconductor packaging are polyurethanes.
Dymax makes those.
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