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 materail that could work?

 

[unclesyd]

You are almost asking for "unobtanium".

One approach is to use a cement used on strain gages.

http://www.hitecprod.com/Html Pages/access_equip.html

Another approach is to use the the ceramic potting and
sealing compounds normally use on electrical feedthroughs.

http://www.cotronics.com/vo/cotr/index.ht

http://www.sauereisen.com/c_prod/c_specialty.asp

I would continue to check out the Silicone approach, though your solvent list is pretty tough on Silicones.

http://www.nusil.com/

Here is another approach using different base materials.

http://www.masterbond.com/