Cemented Joint (for FM & ATEX Approval) Need Mat'l Suggestions

[kcme2005]

I need a material suggestion for an adhesive to use in a cemented joint for an explosion proof enclosure.
The material will go between a 316SS body and a ceramic transducer. We need the material to be fairly flexible so as not to put stress on the transducer and alter its output (especially at low and high temps).
We tried a GE RTV material, which worked great - however, it doesn't have the chemical compatibility needed to meet the standard. Chemical compatibility includes acetone, gasoline, hexane, methanol, ethyl acetate, and acetic acid.
Material must br able to withstand temps as low as -40C, and as high as 200C. It must also have a fairly low viscosity, it must be able to flow between as crack as small as .005".
Does anyone have any ideas for a material that could work?

 

[tygerdawg]

I'm not a materials expert and cannot recommend a specific material. But you have the specs pretty well defined. It sounds like it's time to call the applications departments of the any of the following companies:

General Electric Chemicals
3M
Loctite
Bayer Chemicals
DuPont
<probably plenty of others that would love to hear from you>

TygerDawg

 

[ScottyUK]

Add Dow and Ciba to that list. Chemically, the epoxies sound a good fit if you can find one sufficiently resilient. Dow's range of silicones is vast too - once you move away from RTV types the choice of available properties becomes much broader. Can you accept a thermal cure?


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Sometimes I only open my mouth to swap feet...

 

[berkshire]

kcme2005 (Mechanical)
acetic acid. is used to break down epoxies, what percentage are you dealing with here?
It may affect your use of epoxy.
B.E.