Rong,

Try RJR-4B from RJR Polymers (7875 Edgewater Drive, Oakland, CA, USA) at
[email protected].  I have used this adhesive many times and obtained a near
perfect hermetic seal.  Typical Helium Leak Rate for this material is less
than 3E-8 and will survive 50 cycles in a 275 degree C solder bath with zero
failures.  This material will also pass space outgassing requirements if this
is necessary.  RJR Polymers provide a service that will apply the adhesive to
your lid so you can just clamp the lid mechanically then heat in dry nitrogen
or vacuum to cure and seal.

Harold L. Snyder, Jr.
Scientist & Consultant

It's simple to build MEMS!
Join IMAPS to apply it!  (International Microelectronics & Packaging Society)
www.imaps.org

Begin Included Message:
==========================

> Subj: [mems-talk] Hermetic sealing
> Date: 10/5/2001 1:43:33 PM Central Daylight Time
> From:    [email protected] (Rong Hou)
> Sender:    [email protected]
> To:    [email protected] ('[email protected]')
>
>
> Hello,
> I am trying to find a hermetic sealing method for
> Plastics packaging (PEI, or PPS), glass frit method requires
> higher temperature than I expect. Anybody has ohter thoughts
> beside epoxy and welding seal?
> Thanks.
>
> Rong
>

==========================
End Included Message.